【摘要】：通過RUSLE獲取1999—2010年福建長汀縣土壤侵蝕基礎數(shù)據(jù),選擇坡度、土壤可蝕性、降雨侵蝕力、地形起伏度、植被覆蓋度和人口密度6個指標,利用土壤侵蝕強度指數(shù)分析11 a間土壤侵蝕和生態(tài)脆弱性二者變化的協(xié)同性。結果表明:研究區(qū)中部與東南部水土流失嚴重、生態(tài)脆弱性程度高,二者同期分布面積比例由微弱往嚴重程度減小,二者各等級空間分布具有較強相關性;1999—2010年間,各侵蝕等級發(fā)生減弱面積比例達81.71%~99.80%,各脆弱等級發(fā)生減弱面積比例達43.96%~73.83%,土壤侵蝕程度降低,生態(tài)脆弱性減輕,11 a間生態(tài)環(huán)境恢復比水土治理難度大;隨著各脆弱性等級轉化程度的不同,土壤侵蝕強度指數(shù)(Ei)表現(xiàn)出規(guī)律性的變化區(qū)間,分別為[-95,+44]、[-147,-104]∪[+45,+126]、[-233,-149],其強度變化區(qū)間與脆弱度演化呈現(xiàn)高度協(xié)同效應。
[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，

本文編號：2130338