基于土壤流失方程的连云港土壤保持功能评价

Evaluation of Soil Conservation Function in Lianyungang Based on Soil Loss Equation

旨在评估不同地类土壤保持能力,预防与处理连云港土壤侵蚀问题。基于ENVI与ArcGIS软件,结合通用土壤流失方程(USLE),以土壤保持量为评价指标,综合利用降雨、土地分类及土壤质地分类等数据开展研究区土壤保持功能评估研究。研究表明:1)研究区中部与东部高海拔地区及降雨丰富的西北部地区土壤侵蚀情况较为严重;2)研究区2018年总土壤保持量为334.20 t,其中耕地土壤保持量最大,占总保持量的66.40%,各土地利用类型的年均单位面积土壤保持量以林地与草地最多,分别为2.93(t/hm^(2)·a)和2.44(t/hm^(2)·a);3)采取以耕地保护为主,对海拔高、降雨量多的地区实施植被覆盖等措施抑制土壤侵蚀显得极为关键。

The purpose is to evaluate the soil conservation ability of different types of land,and to prevent and deal with soil erosion in Lianyungang.Based on ENVI and ArcGIS software,combined with the Universal Soil Loss Equation(USLE),taking soil conservation as the evaluation index,it comprehensively uses the data of rainfall,land classification and soil texture classification to carry out the evaluation of soil conservation function in the study area.The research shows that:(1)The soil erosion in the high-altitude areas in the central and eastern parts of the study area and in the northwestern area with abundant rainfall is more serious;(2)The total soil conservation in the study area in 2018 was 334.20 t,of which the cultivated land soil conservation was the largest,accounting for 66.40%.The most annual average soil conservation per unit area of each land use type were forest land and grassland,which were 2.93(t·hm^(-2)·a^(-1))and 2.44(t·hm^(-2)·a^(-1))respectively;(3)It is extremely critical to take measures such as arable land protection and vegetation coverage in areas with high altitude and much rainfall to suppress soil erosion.