Water erosion response to rainfall and land use in different drought-level years in a loess hilly area of China
Water erosion response to rainfall and land use in different drought-level years in a loess hilly area of China
复制标题
黄土丘陵区不同干旱水平年份水土流失对降雨和土地利用的响应
DOI：
10.1016/j.catena.2010.01.002
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发表时间：
2010-04
期刊：
影响因子：
6.2
通讯作者：
中科院分区：
文献类型：
--
作者：
黄土丘陵区由于降雨量变化大、土地覆盖少等原因，水蚀严重且时间波动大，增加了侵蚀定量、预测和控制的难度。本研究自1986年以来在甘肃省典型的黄土丘陵区定西市实施了15个径流小区试验。首先利用连续的土壤侵蚀资料和干旱指数筛选出代表丰水年、平水年和干旱年的3个典型年。在此基础上，分析了3个典型年耕地、苜蓿地、灌丛地、林地和草地5种土地利用类型的土壤侵蚀动态。结果表明：（1）年侵蚀强度最大的区域不是WY，而是DY;而且，DY的患病率远远高于NY和WY。总降雨深度和降雨事件数的顺序为WY>NY>DY，但平均最大侵蚀强度的顺序为DY>NY>WY。这一发现对控制侵蚀具有重要意义。也就是说，不能仅从年降雨量来判断水蚀的程度。应更多地注意具体的降雨变量和分布。第三，不同土地利用方式对水土流失的影响不同，沙棘在减少水土流失方面的作用大于陡坡地种植的春小麦。最后，无论干旱程度如何，只有少数高强度事件才是造成年度大部分水土流失的原因。
Due to rainfall variation and poor land cover, water erosion in the loess hilly area is severe and experiences high temporal fluctuations, which increase the difficulties of erosion quantification, prediction and control. In this study, 15 runoff plots were implemented in Dingxi, a typical loess hilly area of Gansu Province since 1986. Three typical years representing WY (wet year), NY (normal year) and DY (drought year) were firstly filtered based on the consecutive rainfall-erosion data and an aridity index. Then, water erosion dynamics involving five land uses (cropland, alfalfa, scrubland, woodland and grassland) in the three typical years were analyzed. The following results were found. Firstly, the most severe annual erosion rates did not appear in WY, but in DY. Moreover, the rates in DY were far higher than those in NY and WY. Secondly, although total rain depth and number of events were in the order of WY>NY>DY, mean maximal intensity of erosive rainfall however, was in the order of DY>NY>WY. This finding is important for erosion control. Namely, we cannot judge water erosion degree just from annual rainfall. More attention should be paid to the specific rainfall variables and distributions. Thirdly, different land uses played an important role with sea buckthorn reducing water erosion in contrast to spring wheat cultivated on steep slopes. Lastly, regardless of different drought-level years, only a few number of events with high intensities were responsible for the majority of annual soil and water loss.
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影响因子：
3.8
作者：
FU, BJ
通讯作者：
FU, BJ
影响因子：
--
作者：
Wei Wei-Wei;Chen Li;Fu Bo
通讯作者：
Wei Wei-Wei;Chen Li;Fu Bo
影响因子：
6.4
作者：
W. Hogarth;J. Parlange;C.W Rose;G. Sander;T. Steenhuis;A. Barry
通讯作者：
W. Hogarth;J. Parlange;C.W Rose;G. Sander;T. Steenhuis;A. Barry
影响因子：
6
作者：
B. Ulén;Teresa Kalisky
通讯作者：
B. Ulén;Teresa Kalisky
DOI：
10.1002/joc.1808
发表时间：
2009-10
期刊：
International Journal of Climatology
影响因子：
--
作者：
S. Beguerı́a;S. Vicente‐Serrano;J. López‐Moreno;J. García‐Ruiz
通讯作者：
S. Beguerı́a;S. Vicente‐Serrano;J. López‐Moreno;J. García‐Ruiz