南方典型红壤区生态脆弱性与土壤侵蚀的演化关系

发布时间：2018-07-17 17:10

【摘要】：通过RUSLE获取1999—2010年福建长汀县土壤侵蚀基础数据,选择坡度、土壤可蚀性、降雨侵蚀力、地形起伏度、植被覆盖度和人口密度6个指标,利用土壤侵蚀强度指数分析11 a间土壤侵蚀和生态脆弱性二者变化的协同性。结果表明:研究区中部与东南部水土流失严重、生态脆弱性程度高,二者同期分布面积比例由微弱往严重程度减小,二者各等级空间分布具有较强相关性;1999—2010年间,各侵蚀等级发生减弱面积比例达81.71%~99.80%,各脆弱等级发生减弱面积比例达43.96%~73.83%,土壤侵蚀程度降低,生态脆弱性减轻,11 a间生态环境恢复比水土治理难度大;随着各脆弱性等级转化程度的不同,土壤侵蚀强度指数(Ei)表现出规律性的变化区间,分别为[-95,+44]、[-147,-104]∪[+45,+126]、[-233,-149],其强度变化区间与脆弱度演化呈现高度协同效应。
[Abstract]:The basic data of soil erosion in Changting County, Fujian Province from 1999 to 2010 were obtained by RUSLE. Six indexes, slope, soil erodibility, rainfall erosivity, topographic fluctuation, vegetation coverage and population density, were selected. The synergism between soil erosion and ecological vulnerability during 11 years was analyzed by soil erosion intensity index. The results show that the soil and water loss in the middle and southeast of the study area is serious, the ecological vulnerability is high, the distribution area ratio of them decreases from weak to serious, and the spatial distribution of the two levels has a strong correlation between 1999 and 2010. The proportion of weakened area of each erosion grade is 81.71 and 99.80, and the ratio of weakened area of each fragile grade is 43.96 and 73.83. The degree of soil erosion is reduced, and the ecological environment restoration is more difficult than that of soil and water control in 11 years. Soil erosion intensity index (ei) showed regular variation range with different degree of vulnerability transformation, which were [-95, 44], [-147 ~ (-104)] 鈪，

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