Degradation of soil physicochemical quality by ephemeral gully erosion on sloping cropland of the hilly Loess Plateau, China
Degradation of soil physicochemical quality by ephemeral gully erosion on sloping cropland of the hilly Loess Plateau, China
复制标题
黄土高原丘陵坡耕地短暂沟蚀对土壤理化质量的退化
DOI：
10.1016/j.still.2015.07.012
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发表时间：
2016
影响因子：
6.5
通讯作者：
Wilson, Glenn
中科院分区：
文献类型：
--
作者：
Xu, Mingxiang;Li, Qiang;Wilson, Glenn
浅沟侵蚀是一种常见的浅层线性侵蚀，对农业系统的生产力和可持续性构成重大威胁。这项研究的目的是评估EGE对土壤理化性质的影响，这些性质决定了土壤质量。这是假设，与没有EGE的地点相比，有EGE的地点表现出显著的土壤物理化学性质的变化。采用成对取样方法，对中国黄土丘陵区沟底至沟间0~2、2~5、5~10 cm土层土壤理化性质进行了比较研究。结果表明，EGE对土壤理化性质构成威胁，土壤质量指数随EGE的增加而逐渐降低。土壤质量指数随沟谷深度的增加而降低。土壤质量指数显著下降的沟谷深度为<；10 cm，≥为30 cm，划分为3个临界坡度阶段。与对照相比，沟底0-2 cm深度基本上是一个土壤净沉积层，尤其是在侵蚀初期(沟深10 cm)。土壤养分流失以2~5 cm土层最大。土壤物理性质对EGE的敏感性和脆弱性高于土壤养分。土壤物理主导性质的退化发生在侵蚀的第一阶段，主要影响因素是可蚀性(K值)、泥沙含量、比表面积(SSA)和团聚体平均重量直径(MWD)，而土壤退化主要是由于土壤速效养分在随后的侵蚀阶段流失所致。这种现场实地调查与实验室分析相结合的方法，现场研究了短暂冲沟侵蚀对土壤理化性质的影响，有助于了解EGE引起的土壤退化特征。
Ephemeral gully erosion (EGE) is a common type of shallow linear erosion that exerts a major threat to the productivity and sustainability of agricultural systems. The objective of this study was to evaluate the impact of EGE on soil physicochemical properties that determine soil quality. It was hypothesized that sites with EGE exhibit significant changes in soil physiochemical properties compared with sites without EGE. This study used a paired sampling method to compare the soil physiochemical properties of soil at 0–2, 2–5, and 5–10 cm depth of ephemeral gully bottoms to inter-gully areas (CK) in croplands of the hilly Loess Plateau of China. The results showed that EGE posed a threat to soil physicochemical properties and thus the soil quality index was progressively reduced as EGE increased. Reductions in soil quality index were observed as stages of EGE (depth of gully) increased. Three critical EGE stages were defined by <10 cm and ≥30 cm depths of gully where the soil quality index decreased significantly. Compared with the CK, the 0–2 cm depth of the gully bottom was essentially a net soil deposition layer, especially for the first erosion stage (gully < 10 cm deep). Soil nutrient loss was greatest in the 2–5 cm depth. Soil physical properties were more susceptible and fragile to EGE than soil nutrients. Degradation of soil physical-dominated properties occurred in the first erosion stage, with key factors being erodibility (Kvalue), silt content, specific surface area (SSA) and mean weight diameter of aggregates (MWD), whereas soil degradation was mainly caused by losses of soil available nutrients during the subsequent erosion stages. This approach of combining field ground-truth survey with laboratory analysis to study the in-situ impact of ephemeral gully erosion on soil physicochemical properties aids in understanding the features of soil degradation caused by EGE.
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影响因子：
6.2
作者：
E. Taguas;Yongping Yuan;R. Bingner;J. A. Gomez
通讯作者：
E. Taguas;Yongping Yuan;R. Bingner;J. A. Gomez
影响因子：
6.2
作者：
A. Auzet;J. Boiffin;F. Papy;B. Ludwig;J. Maucorps
通讯作者：
A. Auzet;J. Boiffin;F. Papy;B. Ludwig;J. Maucorps
DOI：
--
发表时间：
1978
期刊：
--
影响因子：
--
作者：
W. H. Wischmeier;D. Smith
通讯作者：
W. H. Wischmeier;D. Smith
DOI：
--
发表时间：
2010
期刊：
Transactions of the Chinese Society of Agricultural Engineering
影响因子：
--
作者：
Qin Wei;Zhu Qing-ke;Zhao Leilei;Kuang Gao-ming
通讯作者：
Qin Wei;Zhu Qing-ke;Zhao Leilei;Kuang Gao-ming
影响因子：
--
作者：
P. Fahnestock;R. Lal;G. F. Hall
通讯作者：
P. Fahnestock;R. Lal;G. F. Hall