农业环境科学学报2018，Vol.37Issue(4)：756-765,10.DOI:10.11654/jaes.2017-1486
喀斯特地区坡面不同土地利用方式水土流失及磷素输出对次降雨特征的响应
Response of soil erosion and phosphorus losses to individual rainfall under different land uses at Karst slopes
摘要
Abstract
In order to understand the response of soil erosion and phosphorus losses to individual rainfall under different land uses at Karst slopes,water and sediment samples were collected from different Karst slopes.These samples comprised conservation forest,farmland,nat-ural meadow,bare land,and economic fruit forest land uses.The results indicated that the descending order of runoff coefficients for the five land-use types were as follows:bare land﹥natural meadow﹥farmland﹥conservation forest﹥economic fruit forest. The sediment yield and phosphorus losses per unit area were(in descending order)as follows:farmland﹥bare land﹥economic fruit forest﹥conservation forest﹥natural meadow.Under large rainfall and high-intensity rainfall conditions,runoff coefficients,sediment yield per unit area,and phosphorus losses per unit area of farmland and bare land increased sharply.Rain intensity was a significant factor that affected soil erosion and phosphorus losses, which fitted well with the amount of soil erosion.Particulate phosphorus(PP)was the main loss of total phosphorus(TP), ranging from 75.47% to 97.91%.Farmland runoff[0.73 mg·L-1﹤ρ(TP)﹤2.49 mg·L-1],bare land runoff[0.10 mg·L-1﹤ρ(TP)﹤0.50 mg·L-1]and eco-nomic fruit forest runoff[0.13 mg·L-1﹤ρ(TP)﹤0.46 mg·L-1]could lead to phosphorus loadings increasing in receiving waters,while that of natural meadow runoff[0.03 mg·L-1﹤ρ(TP)﹤0.09 mg·L-1]had minor impacts on pollutant loadings in receiving waters.Soil erosion and phos-phorus losses correlated strongly with precipitation processes and land uses,suggesting that land-use structure optimization and human dis-turbance reduction could be an effective method to mitigate soil erosion and non-point source pollution.关键词
喀斯特/土地利用方式/次降雨/水土流失/磷Key words
Karst area/land uses/individual rainfall/soil erosion/phosphorus分类
农业科技引用本文复制引用
彭宏佳,吴起鑫,任斐鹏,安艳玲,付宇文,刘瑞禄,吕婕梅..喀斯特地区坡面不同土地利用方式水土流失及磷素输出对次降雨特征的响应[J].农业环境科学学报,2018,37(4):756-765,10.基金项目
国家自然科学基金委-贵州省喀斯特联合基金项目(U1612442) （U1612442）
贵州省水利厅科技基金项目(KT201508) （KT201508）
贵州省科技厅联合基金项目(黔科合LH字[2016]7457号) （黔科合LH字[2016]7457号）
三峡工程生态与环境监测系统长江上游典型区小流域监测重点站项目(JJ[2016]-021)The Joint Fund of the National Natural Science Foundation of China and Guizhou Province,China(U1612442) （JJ[2016]-021）
Science and Technology Fund of Water Resources Department of Guizhou Province,China(KT201508) （KT201508）
Joint Fund of Science and Technology Department of Guizhou Province,China(Qian,LH[2016]7457) （Qian,LH[2016]7457）
Ecological and Environmental Monitoring System of the Three Gorges Project,Key Monitoring Stations of Small Watershed in Typical Areas Along the Upper Reaches of the Yangtze River(JJ[2016]-021) （JJ[2016]-021）
