Draft submitted to Central Appalachian Prosperity Project Soil as a Pillar for a New Appalachian Economy By Samir K Doshi1, 2, * and John H Todd1, 2 1Gund Institute for Ecological Economics; 2Rubenstein School of Environment and Natural Resources, University of Vermont * Email correspondence to [email protected] While the farmer holds the title to the land, actually it belongs to all the people because civilization itself rests upon the soil. - Thomas Jefferson, Appalachian Farmer and Former US President Introduction Similar to an ecological system, civilization has always depended on a foundation for survival -‐ soil -‐ to build our shelters on, filter our water and wastes, nurture our food systems, and regulate our climate. As the pioneering soil scientist Hans Jenny taught, soil should not be thought of as a material, but a living system (Jenny, 1941). We will explore the evolution of soil in Appalachia, its significance to the culture, and how regenerating degraded soils can provide the basis for numerous enterprises. Across a distance of 1100 miles from Alabama to southern Quebec, the Appalachian Mountains form the Eastern spine of our continent. The mountains are old, elder to and more eroded than the Rockies, Himalayas and most other mountain ranges on the planet. The borders of Central Appalachia are hard to define, as it interpreted by both culture and environment. Ecologically, the Wisconsonian ice sheet retreated from Southern Pennsylvania nearly 14,000 years ago, where the northern border of Central Appalachia becomes evident from its unique biological diversity and ecosystem assemblages. It ventures south until we start to see greater levels of diversity in the Smoky Mountains of Tennessee and North Carolina (Constantz, 1995). Culturally and even politically, Central Appalachia is often recognized as the specific region of Southwestern Virginia, Southern West Virginia, Eastern Kentucky, Eastern Tennessee and Western North Carolina (Sarnoff, 2003). The region has a long and storied connection to the land. Before European explorers arrived, the Shawnee and Cherokee indigenous tribes thrived in the area supported by agricultural staples such as corn and squash. After the French and Indian War in the mid 18th century, subsistence agriculture played an integral role of the local economy until the early 20th century, with the presence of tobacco as an important cash crop. In the late 1800s, the steam powered engine opened access to much of Appalachia’s pristine forests. Logging increased until the 1950s, when the industry shifted its production towards the Pacific Northwest and a greater amount of Appalachian land was set aside as national parks. Although coal has been mined in Appalachia since the early 1700s, large-‐scale production began in the late 19th century, again as a result of mechanization and the expansion of the railroads. Mining continued to rise at a booming rate through World War I and then suffered a large bust during the Great Depression. Due to the booming period of the early 20th century, population trends in Appalachia rose dramatically. World War II brought production increases in both coal and timber, but this spike was only temporary and the remaining communities that were tied to the extractive industries fell into regional poverty, which drew the attention of the government and the development of the Appalachian Regional Commission (Williams, 2001). The past few decades have seen a strong reduction in poverty and renewal in timber and coal production; however, this period continues to follow the boom and bust cycles previously experienced in Central Appalachia and in other single resource dependent economies. In his book, Lost Landscapes and Failing Economies, resource economist Thomas M. Power states that economic diversification is the only solution to the instability and tendency toward decline associated with rural, industrial populations (Power, 1996). Similarities to other regions Central Appalachian communities resemble other single resource dependent and extractive communities. Forestry in Oregon, industrial agriculture in Iowa, metal mining in Nevada – all the associated communities have seen trends of declining income and health along with increasing environmental degradation. It’s a story that we can see throughout natural resource economies, and the results are always the same: intensified specialization in a few sectors, larger percentages of private vs. public resource ownership with fewer owners, increased job loss with more publicity on ‘indirectly’ associated jobs, and a decrease in social well-‐being and health (Power, 1996). Significance of Soil In The Unsettling of America, Wendell Berry writes, “The soil is the great connector of our lives, the source and destination of all” (Berry, 1984). From the nutrients that feed us to the structures that stabilize our shelters and finally the bacteria that decompose our bodies, the soil is where we come from and where we return. The soils of Appalachia can be described as being in a moderate climate and having well-‐balanced moisture content. Appalachian soils are classified as inceptisols, ultisols and alfisols -‐ developed from heavily weathered shale, sandstone, and siltstone, as well as materials transported down-‐slope by gravity and water. The high organic matter content and fertility, as well as higher acidic content is a product of the vegetation cover of the Eastern hardwood oak, hickory and formerly chestnut forest (Costantz, 1995; Haering, 2004). One of the most alarming issues facing us today is that soil is degrading globally at a rate of 5 tons per acre per year, compared with natural soil formation rate of 4.5 tons per acre per year. That is an annual loss approximately the size of Ukraine, along with all the associated ecosystem services. Nearly 40% of the world’s agricultural lands are severely degraded. In the U.S., two-‐thirds of degraded soils are an effect of industrial agriculture. Figure 1 shows soil degradation levels across the globe. Agriculture causes 30% of soil degradation, deforestation contributes 4%, and the remainder is a mix of different applications. Although there are differing severities of degradation, the loss of land productivity as a product of large-‐scale industrialized activities has impacted nearly 75% of the U.S (Lal et al., 2004). Figure 1: Global levels of degraded soils (UNEP, 1997). This is not erosion. Technically, erosion is a natural occurrence caused by wind, water and gravity, just as soil formation is a process that occurs by the weathering of bedrock and decomposition of organic matter as a function of climate, time and topography. Human induced erosion is defined as degradation, and is usually more severe than natural occurrences (Blaikie and Brookfield, 1987). This involves impacts to the physical, chemical and biological components of the soil. When engineers and others refer to needing ‘erosion control’ as a consequence of industrial activity, it is really ‘degradation control.’ The consequences of soil degradation are obvious – food, climate, shelter, and water security will all be at risk (Daily, 1995). In the current climate of food insecurity, water scarcity and a growing population, the health of our soil should be a priority, and as we will see in the next section, can even be a foundation for economic and community development. Soil Impacts Agriculture In Central Appalachia, forestry and mining make up a larger percentage of soil degradation than the national averages, but agriculture and overgrazing still have a significant impact. Agricultural systems often include annual tillage, monoculture production, and fertilizer applications that subside and compact soils, pollute waterways from runoff, decrease soil organic matter and aggregates, and severely impact soil microorganism habitats. Healthy topsoil should be approximately 50% solid materials and 50% pore space (Brady and Weill, 2001). The plow has been seen as a necessity to produce enough yields for a growing population, but it has reduced soil structure and the susceptibility to soil loss and degradation. This was a large factor in the desertification of the ‘Dust Bowl’ era (Lal, 2007a). We cannot discuss the issue of soil degradation in agriculture without acknowledging the work of Wes Jackson and The Land Institute. Jackson presents his philosophy of our society’s connection to the land in his seminal work, New Roots for Agriculture. He prefaces, “Most analyses of problems in agriculture do not deal with the problem of agriculture,” meaning that we normally discuss the impacts of agricultural methods, not the current system of agriculture itself. Jackson sees the practices of tillage and annual crop production as a diversion from natural ecosystem processes and consequently a threat to our ecosphere (Jackson, 1980). Forestry Forestry operations have greatly improved over the past decades and are a greater concern in developing countries; however, the impact in the U.S. is not insignificant. Forestry effects include soil compaction, increased runoff through alteration of landscape hydrology, emission of greenhouse gases such as carbon and methane, and loss of wildlife habitat and biodiversity. Although practices of forestry management have evolved to reduce impacts and ultimately protect the longevity of timber harvesting, much of the landscape has already been impacted by these operations (Lal et al., 2004; Lal, 2007b). Coal Mining Mining impacts on soil include the effects of deforestation in combination with disturbing the entire soil profile, impacting the physical, chemical and biological properties of all the ‘overburden’ that is removed. This displacement can be up to several hundred meters belowground depending on the location of the coal seem that was mined. In mountainous regions, mining operations can also result in landslides and sedimentation, or vast deposits of sediment that often bury stream corridors and impact aquatic ecosystems. The mixing of overburden with soil is known as ‘spoil,’ and often includes the oxidation of iron sulfide in water which results in acid mine drainage (Haering et al., 2004; Daniels et al., 2004). There are fundamentally two different types of mine spoils – those that came before 1977 and those that came after (Figure 2). Due to the environmental concerns of strip mining, the federal government passed the Surface Mining Control and Reclamation Act of 1977 (SMCRA). Before the 1970s, mine sites were reclaimed with an exposed highwall left in tact, and the surrounding soils were left loose which allowed for more sedimentation, but also greater porosity and water retention capability that can promote root growth and development (Shresthra, 2007). After 1977, one of the predominant objectives in mine reclamation involved grading the site to a subjective conception of the approximate original contour and compacting soils severely to reduce landslides and material transport post-‐mining (Daniels et al, 2004). The compaction led to decreased porosity, aggregate formation, water retention, microbial habitat, nutrient cycling etc. – essentially, a soil devoid of health. The spoils are then hyrdoseeded with mixes of invasive grasses and legumes that do not aid in nutrient cycling or carbon sequestration, but are inexpensive options for basic erosion control (Booze-‐Daniels et al., 2000). To put the issue of soil degradation in context with other global issues, all of the aforementioned industrial applications cause large amounts of soil carbon to be emitted into the atmosphere and exacerbate the threat of climate change. After the oceans, the soil system is the second largest active carbon reservoir on the planet and has the second longest residence time meaning that it is a more stable carbon pool (Lal, 2007b). We have discussed the significance of soil to our culture, the alarming rate at which it is being depleted and the processes that contribute to its loss. Soil formation is an event that occurs on geologic timescales of 1000 years and is influenced by climate, topography, biota, the parent material and time. The majority of soil is formed from the weathering of the parent material, or the rock underneath (Brady and Weill). Topsoil, the upper few inches of the soil, is where the majority of biological activity in the soil occurs. This is also the layer of soil that is being degraded the most. Topsoil is a much more active system than the deep soil, and is chiefly formed by the addition of organic matter from aboveground vegetation and natural root decomposition (Albrecht, 1938; Brady and Weill, 2001). Topsoil eventually decompose further and add to the humic and organic content of deep soil. Using dedicated soil building and restoration techniques, we can regenerate and restore the vitality of the topsoil in Appalachia in a few short years. Figure 2: Typical landforms created in the Appalachian coal region by surface coal mining activities before (1A) and after (1B) passage and implementation of the Surface Mining Control and Reclamation Act of 1977. Mining before SMCRA was generally smaller in scale and mining cuts excavated a higher proportion of pre-weathered, leached and oxidized strata. Post-SMCRA mines are generally much larger in extent and take deeper cuts into more reduced geologic strata (Daniels et al., 2004). As Jenny said, soil is a system -‐ a living system. If properly managed, it can grow and sustain itself. This is the opportunity: just as a single industrial process can cause multiple social, economic and environmental issues, a single solution can provide a multitude of beneficial effects. Solutions We will present an overview of specific soil restoration techniques and how these can be applied to develop new enterprises. Each of these applications can be researched into much more detail, and many local organizations have already undertaken new initiatives to exploit the potential of utilizing healthy soil as a foundation for a diversified and resilient local economy. Also, we want to recognize that restoration in of itself is not enough. Forests and landscapes can be restored to their native functions and eventually their native structures, but this completely ignores the processes that led to the degradation and could just setup the landscape to be exploited again (Hobbs, 2006). Rather, we need to acknowledge the anthropic nature of degradation and the capacity to develop solutions that address the interaction between our culture and nature, essentially seeking to sustain the triple bottom line of ecology, economy and society. Engineered vs. Successional Soil Restoration The conventional method of restoring degraded soils is to use large-‐scale machinery to engineer a new landscape. This alternative is selected when time is seen as a limiting factor and restored landscapes are desired in the short term. If the industrial operator or landowner is performing the restoration, then this is often the best choice to reduce the impact on adjacent ecosystems and their associated services. Degraded soils are tilled and fertilized as determined for productive land use, with the focus being on the physical soil structure and chemical balance of nutrients. Biological considerations are usually limited to aboveground species diversity and establishment, and little regard is paid to underground soil functions and bioactivity. Often, topsoil substitutes are imported and seeded or reforested with early successional species of vegetation. Native soils are sometimes used because of their source as a native seed bank. The soils have to be applied as soon as possible as storage reduces seed germination rates (Hobbs, 2006; Bradshaw, 1997). Criticism of engineered restoration techniques include that they often reduce the effort down to the minimum requirements determined by either a contract or legislation such as the Clean Air Act, Clean Water Act, Resource Conservation and Recovery Act, National Environmental Policy Act, etc. Also, all the stakeholders impacted are usually not included in the decision-‐making process, with local communities generally bearing the brunt of the long-‐term associated costs as in the case of SMCRA and its decisions made by regulators, coal companies and frequently absent landowners. Depending on the scale and length of time that the restoration process requires, this could be either a boom or a blip to the local economy and job production. Natural techniques of soil restoration focus on promoting natural successional functions of the ecosystem (Bradshaw, 1997). These restoration methods require more labor, take more time, and have historically been on more of a community level than large landscape scales. A celebrated example of large scale successional restoration is Willie Smits’ conservation initiative in Indonesia that regenerated thousands of hectares of degraded landscapes into a lush and native rainforest, while educating and employing thousands of locals (Christern, 2009). Figures 2 and 3 show the dramatic change in less than 5 years of 2000 hectares being reforested and the diversity of over 1000 species of vegetation restored. This example could be especially applicable to the region of Appalachia. Successional restoration focuses on community ecology that restores biological, chemical and physical ecosystem functions rather than just erosion control, specific species establishment and ground cover. Although successional restoration can include machinery, it is usually an economically and ecologically less intensive alternative than an engineered solution. More labor means a more community derived approach and allows for more input from those that are affected by the process. Figures 3 (top) and 4(bottom): Wildlife biologist Willie Smits restores a tropical rainforest in Borneo, Indonesia to help conserve orangutan populations. Criticism of successional restoration comes down to funding and time. If communities are restoring their own degraded landscapes, then who is paying for the project? Also, if pollution and toxins are involved, then a slower restoration process could be more costly. However, there are applications such as biofuels and biochar production that could produce a commodity while also restoring degraded environments, known as ‘win-‐win ecology’ (Rosenzweig, 2006). Agricultural Soil Restoration A large portion of the U.S. is still farmland, and the majority of this is cultivated as industrial agriculture (NRCS, 2004). One of the most common and destructive practices to soil health is mechanical tillage, which has caused a loss of nearly 50% of soil carbon in our croplands and also perpetuates soil loss and degradation (Lal, 2007a). A number of conservative tillage strategies have been developed over the past 40 years, but the most effective one has been no-‐till management. No-‐till agriculture utilizes residual mulch in combination with seeders that do not plow the land. It is currently employed on 95 million hectares of farmlands worldwide, and is being adopted at an increasing rate. The effects of no-‐ till are dramatic in the reduction of degradation and actually increasing soil carbon sequestration. Certain environments that have a predominant claypan and cold springs might see reduced yields to no-‐till agriculture and it should be used on a case-‐by-‐case basis (Lal, 2007a). Strategies to maintain soil fertility include crop rotations, conventionally performed with a crop/soy/fallow rotation. The benefits of ‘green manure,’ or leguminous cover crops, have received increased recognition, as these systems increase soil structure, water retention and nitrogen fixation without the use of fertilizer (FAO, 2002). The principle of cover crops used in the winter harkens back to William Albrecht, or the ‘father of soil fertility.’ Albrecht said that to minimize organic matter and nutrient loss, the soil should be treated like a natural ecosystem and covered at all times, a concept later espoused by Wes Jackson (Albrecht, 1938; Jackson, 1980). Over 35 years ago in Kansas, The Land Institute proclaimed that agricultural tilled systems should be managed more like native ecosystems, and set out to develop a perennial grain system from traditional plant breeding schemes that would not require any tillage and be planted in polycultures to mimic the native Kansas prairie ecosystem. The ambition will be realized within the decade, according to Jackson, and will turn the practice of global agriculture upside down. Wendell Berry calls the effort ‘an example of a thoroughly informed, technically competent, practical intelligence working by the measure of high ecological and cultural standards” (Jackson, 1980). Several other strategies in agricultural production have proven to be effective at crop production and restoration/maintenance of soil health. Keyline design was developed by the Australian farmer and engineer, P.A. Yeomans. The design takes into account topographic and climate factors to maximize the potential of water flow on an agricultural landscape. Combined with contour plowing strategies, the technique will passively deter runoff from the valley center and eventually allow more water to be retained in the soils and reduce erosion (Yeomans, 1954). Another restoration and conservation technique examines the connection between animals and land management in pasturelands. Holistic Management is a framework that developed the current theories behind rotational grazing. The wildlife biologist Allan Savory saw that ungulates, or hoofed animals, help fertilize their surroundings from their manure and increase germination by breaking apart seeds with their hoofs. The process only worked in natural systems if predators were nearby and the animals did not graze at the same location regularly (Savory and Butterfield, 1999). Holistic Management builds upon these observations and looks at how to restore soil organic matter and manage grasslands through rotational livestock grazing. Although Appalachia is not a native grassland biome, Holistic Management could be employed on degraded farmlands and mine sites that are currently scrublands. Additional systems such as biointensive agriculture and permaculture focus on soil development and mimicking a natural system that follows the ecological principles of diversity and adaptability. Both of these methodologies promote the use of keylining and rotational grazing. Native Warm Season Perennial Grasses Central Appalachia’s native ecosystem is an Eastern hardwood mixed mesophytic forest. But, there are still grass species that are native to the region; they are just outcompeted due to climatic factors that helped establish an Eastern forest vs. a midwestern prairie ecosystem. Native warm season perennial grasses (NWSG) are the backbone of the midwestern prairie system and the principal source of soil organic carbon to one of the richest and most productive soils in the world. NWSG focus their energy on developing root systems more than aboveground vegetation, and develop roots that can go down over 3-‐4 meters in depth (Figure 5) (Miller and Dickinson, 1999). The root systems can penetrate compacted soils and subsoil, making them ideal for restoring degraded landscapes and especially on mine spoils. NWSG also are very effective at cycling nutrients, increasing water retention, and sequestering carbon as their root systems go very deep below the surface (Clark et al., 2003; Elkins et al., 1997). Certain NWSG are highly tolerant of acidic and nutrient poor soils. These grasses require minimal inputs and have also been researched for their aboveground vegetation development and biofuel feedstock productivity (Ceotto, 2008; Tilman et al., 2006). The most researched grasses for biofuel potential that are native in Appalachia and can tolerate degraded soils include switchgrass (Panicum virgatum), atlantic coastal panicgrass (Panicum amarum) and big bluestem (Andropogon gerardii) (Parrish and Fike, 2005; Fike, 2006).
Description: