百喜草治理稀土尾砂的水土保持效果研究  

Effect of Soil and Water Conservation about Planting Paspalum notatum in Tail Mineral Slag of Rare-Earth

作　　者：李德荣[1] 董闻达[1] 廖汉明 利隆橙 李文煜 

机构地区：[1]江西农业大学农学院,南昌330045 [2]江西省龙南县水土保持局,龙南341700

出　　处：《水土保持学报》2003年第4期122-124,共3页Journal of Soil and Water Conservation

基　　金：国家计划委员会"八五"攻关项目"百喜草在国土保护;'三高'农业中的利用研究及推广"(编号:85-606-25-01)资助

摘　　要：1998～2002年,通过种植百喜草(Paspalunnotatum)治理江西省龙南县稀土尾砂,经水土保持试验研究表明:尾砂裸露区(简称对照区)和百喜草种植区(简称植草区)年均径流量分别是302m3/hm2和1326.6m3/hm2;径流系数分别是35.5%和15.3%;5年合并径流量(Y)与降雨量(x)的直线回归方程分别是:Y=4.2562x-47.71和Y=1.3205x-37.31;年均泥沙侵蚀量分别是1073.12t/hm2和91.02t/hm2;泥沙侵蚀量(Q1)与径流量(Q)的函数方程分别是:Q1=1.5182Q0.6971和Q1=Qe-4.6798C(C为百喜草覆盖度)。研究结果还表明:种植百喜草,可快速、有效地降低稀土尾砂水土流失。From 1998 to 2002,the study on planting Paspalum notatum in the tail mineral slag of rare-earth in Longnan county, Jiangxi province were done. The results were as follows:(1)The average runoff amount every year in the exposed tail mineral plot (check plot CP) and in the plot of planting Paspalum notatum (planting plot PP) were 3 302 m^3/hm^2 and 1 326.6 m^3/hm^2, and the runoff coefficient were 35.5%(CP) and 15.3%(PP), respectively. (2)The linear model between the total runoff amount(Y) and rainfall(X) during 5 year were Y=(4.2562x)-47.71(CP) and Y=1.3205x-37.31(PP). The average amount of soil erosion every year were (1 073.12) t/hm^2(CP)and 91.02 t/hm^2(PP), respectively.(3)The relationship between the amount of soil erosion(Q_1) and runoff amount(Q) follows the equation of Q_1=1.5182 Q^(0.6971)(CP) and Q_1=Qe^(-4.6798C)(PP).In the second equation, C is Paspalum notatum cover degree .The results suggest planting Paspalum notatum reduced the amount of tail mineral erosion quickly and efficiently.

关 键 词：百喜草 稀土尾砂 治理 水土保持 径流量 降雨量 泥沙侵蚀量 

分 类 号：S157.433[农业科学—土壤学]