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Dynamics of Soil Organic Carbon Storage and Erosion due to Land Use Change (Illinois, USA)
Eurasian Soil Science ( IF 1.4 ) Pub Date : 2020-05-07 , DOI: 10.1134/s1064229320040122
K. R. Olson , A. N. Gennadiev

Abstract

Many factors including land use, management history, soil series, climate, and soil landscape processes affect the dynamics of soil organic carbon (SOC). The primary objective of this research was to determine the impact of land use change from timberland to cropland on erosion and the SOC storage on sloping landscapes of northwestern Illinois, USA. Typic Hapludalfs and Aquic Udifluvents were studied. The cropland area was previously cultivated from 1860 to 1929, between 1930 and 1979 the area was used for pastureland and was returned to cropland from 1980 to 2009. Since 1980, corn and soybean were grown on a yearly rotation system using a no-tillage system. The timberland area was never cleared and cultivated but was subjected to periodic grazing from 1860 to 2009. The SOC concentration of various soil layers, to a depth of 0.5 m, was measured and expressed on a volumetric basis. For both land uses, the subsurface layers had similar SOC levels. Results suggested that after 150 years the cropland landscape maintained or retained 69.4% of the total SOC of timberland on a volumetric basis. The other 30.6% of the SOC was either deposited in the water or released to atmosphere. This study only included SOC and did not attempt to address or include the amount of C stored in above ground timberland trees or cropland plants or in their root systems. Results suggest that if northwestern Illinois forest soils are cleared and used for cropland during the next 50 years, SOC will be retained in the sediment on lower landscape segments, released to atmosphere as CO2 or released to stream (water) in solution or attached to sediment. The initial timberland SOC levels will not be maintained when converted to cropland use even with a crop rotation which includes small grains and forages and no-till management systems for corn and soybean production. This land use conversion from timberland to cropland would result in greater SOC loss than if the area remained as forestland.



中文翻译:

土地利用变化导致土壤有机碳储量和侵蚀的动态(美国伊利诺伊州)

摘要

土地使用,管理历史,土壤系列,气候和土壤景观过程等许多因素都会影响土壤有机碳(SOC)的动态。这项研究的主要目的是确定美国伊利诺伊州西北部坡地上的土地利用变化(从林地到农田)对侵蚀和SOC储存的影响。研究了典型的Hapludalfs和Aquic Udifluvents。耕地面积以前是1860年至1929年耕种的,1930年至1979年之间是牧场,并于1980年至2009年恢复耕种。自1980年以来,玉米和大豆采用免耕系统逐年轮作种植。 。林地面积从未开垦和耕种过,但从1860年到2009年定期放牧。各种土壤层的SOC浓度为0.5 m,测量并以体积为基础表示。对于这两种土地用途,地下层的SOC含量均相似。结果表明,在150年后,按体积计,农田景观保持或保留了林地总SOC的69.4%。SOC的其他30.6%沉积在水中或释放到大气中。这项研究仅包括SOC,并未尝试解决或纳入地上林木或农田植物或其根系中储存的C量。结果表明,如果在未来50年内清理伊利诺伊州西北部的森林土壤并将其用于农田,SOC将保留在较低景观段的沉积物中,并以CO的形式释放到大气中 结果表明,在150年后,按体积计,农田景观保持或保留了林地总SOC的69.4%。SOC的其他30.6%沉积在水中或释放到大气中。这项研究仅包括SOC,并未尝试解决或纳入地上林木或农田植物或其根系中储存的C量。结果表明,如果在未来50年内清理伊利诺伊州西北部的森林土壤并将其用于农田,SOC将保留在较低景观段的沉积物中,并以CO的形式释放到大气中 结果表明,在150年后,按体积计,农田景观保持或保留了林地总SOC的69.4%。SOC的其他30.6%沉积在水中或释放到大气中。该研究仅包括SOC,并未尝试解决或包括地上林木或农田植物或其根系中储存的碳量。结果表明,如果在未来50年内清理伊利诺伊州西北部的森林土壤并将其用于农田,SOC将保留在较低景观段的沉积物中,并以CO的形式释放到大气中 这项研究仅包括SOC,并未尝试解决或纳入地上林木或农田植物或其根系中储存的C量。结果表明,如果在未来50年内清理伊利诺伊州西北部的森林土壤并将其用于农田,SOC将保留在较低景观段的沉积物中,并以CO的形式释放到大气中 该研究仅包括SOC,并未尝试解决或包括地上林木或农田植物或其根系中储存的碳量。结果表明,如果在未来50年内清理伊利诺伊州西北部的森林土壤并用于农田,SOC将保留在较低景观段的沉积物中,并以CO的形式释放到大气2或释放到溶液中流(水)或附着在沉积物上。转换为耕地使用后,即使包括小谷物和牧草在内的轮作以及玉米和大豆生产的免耕管理系统,也不会保持最初的林地SOC水平。从该林地到耕地的土地利用转换将导致SOC损失比该地区仍为林地更大。

更新日期:2020-05-07
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