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华中农业大学资源与环境学院,武汉,430070
Published:2022
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LI Jialin, CHEN Jiahui, HUA Li, et al. Spatial and Temporal Characteristics of Soil Erosion in Hubei Province Based on CSLE[J]. 2022, 36(4): 43-52.
LI Jialin, CHEN Jiahui, HUA Li, et al. Spatial and Temporal Characteristics of Soil Erosion in Hubei Province Based on CSLE[J]. 2022, 36(4): 43-52. DOI: 10.13870/j.cnki.stbcxb.2022.04.007.
以湖北省为研究区,利用CSLE模型计算1990—2015年的土壤侵蚀模数,借助GIS空间分析方法揭示多时期土壤侵蚀的时空变化特征。结果表明:(1)湖北省主要为微度侵蚀,其次为轻度侵蚀,中度侵蚀及以上等级侵蚀所占面积较小,轻度侵蚀、中度侵蚀、强烈侵蚀、极强烈侵蚀和剧烈侵蚀面积25年间分别减少11 267.0,497.6,176.9,307.7,313.7 km2,减幅分别为27.39%,13.85%,11.79%,24.88%和56.04%。(2)总侵蚀面积先减再增后持续减少,其中极剧烈和剧烈侵蚀面积下降明显。侵蚀强度在不同时期的变化呈现空间异质性。1990—1995年、2000—2005年和2010—2015年土壤侵蚀以好转为主,土壤侵蚀强度降低区域1990—1995年集中在恩施、咸宁,1995—2000年集中在恩施、十堰,2000—2005年集中在神农架林区、宜昌市和秭归县周边,2005—2010年集中在黄冈和黄石市,2010—2015年集中在神农架林区和宜昌市;其中旱地与裸地好转情况最为明显。在1995—2000年和2005—2010年土壤侵蚀加剧,土壤侵蚀强度加剧区域1990—2000年集中在神农架局部地区,2000—2005年集中在十堰市,2005—2010年集中在竹溪县;2010—2015年集中在恩施市、宣恩县和鹤峰县,其中林地与旱地表现最为明显。土壤侵蚀主要变化区域表现在25年间,坡度<8°区域轻度以上等级侵蚀面积逐年增加,这与人类活动对地表负面扰动(生产建设项目、坡耕地农业生产、其他人类活动导致的土地利用类型转换)等主要集中在地形较为平缓的区域有很大关系。坡度在8°~35°区域轻度以上等级侵蚀面积明显减少,主要表现在退耕还林和水保工程治理的实施取得成效明显。
Soil erosion is one of the global environmental problems restricting the survival and development of human beings. With the development of economy
human activities induce the aggravation of soil erosion and bring about eco-environmental problems in the short time. Therefore
taking Hubei Province as the research area
the CSLE model is used to calculate the soil erosion modulus from 1990 to 2015
and the GIS spatial analysis method is revealed the spatiotemporal characteristics of soil erosion in multiple periods. The results show that Hubei Province mainly has slight erosion
followed by mild erosion
and other grade erosion such as moderate erosion occupies a small area. The areas of mild erosion
moderate erosion
strong erosion
extremely strong erosion and severe erosion decreased by 11 267.0
497.6
176.9
307.7
313.7 km2 respectively in 25 years
with decreases of 27.39%
13.85%
11.79%
24.88% and 56.04% respectively. The total erosion area first decreased
then increased
and finally continued to decrease. Among them
the area of intense erosion and extremely intense erosion decreased significantly. The changes of erosion intensity in different periods show spatial heterogeneity. Soil erosion was mainly improved in 1990-1995
2000-2005 and 2010-2015
such as Enshi and Xianning in 1990-1995
Enshi and Shiyan in 1995-2000
Shennongjia forest area
Yichang City and the periphery of Zigui County in 2000-2005
Huanggang and Huangshi City in 2005-2010
Shennongjia forest area and Yichang City in 2010-2015; Their soil erosion conditions are gradually improving
and the improvement of dry land and bare land is the most obvious. Soil erosion was intensified in 1995-2000 and 2005-2010
and the intensification of soil erosion was concentrated in Shennongjia area (1990-2000)
Shiyan City (2000-2005)
Zhuxi County (2005-2010) Enshi City
Xuanen County and Hefeng County (2010-2015)
among which forest land and dry land were the most obvious. The main change areas of soil erosion are as follows:in the past 25 years
the area of mild and above grade erosion in thearea with slope less than 8° has increased year by year
which is closely related to the fact that the negative surface disturbance caused by human activities (production and construction projects
agricultural production of sloping farmland
land use type conversion caused by other human activities) is mainly concentrated in the region with relatively flat topography. The area with a slope of 8° to 35° with mild or above grade erosion has beensignificantly reduced
which is mainly manifested in the remarkable results achieved in the implementation of returning farmland to forests and comprehensive control of soil erosion and water loss.
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