摘要
采用人工模拟降雨的试验手段,设定6个降雨强度(31.8～114.0mm·h-1),通过测试径流量、泥沙量、径流中总氮(TN)和总磷(TP)浓度,研究了浙江省2种不同经营方式竹林(用材竹林和笋竹林)坡地(坡度20°)径流的载荷特征及机理.结果表明:用材竹林地的总径流量和径流系数均高于笋竹林地;笋竹林地的径流含沙量和总产沙量远大于用材竹林地;相同雨强下,笋竹林地降雨径流中的TN浓度为用材竹林地的5～6倍,笋竹林坡地径流中TN浓度随雨强增大而减小;用材竹林地降雨径流中TP浓度高于笋竹林地,笋竹林地泥沙中TP流失量是用材竹林地的数百倍;在TN和TP随径流泥沙的流失过程中,产流前期浓度起主要作用,后期径流量和产沙量起决定作用.
To understand the load characteristics and related mechanisms of surface runoff on two management types of bamboo forests（bamboo timber forest and bamboo shoot forest） slopes（gradient 20°） in Zhejiang Province,this study measured the runoff volume,sediment yield,its total nitrogen（TN） and total phosphorus（TP） concentrations of runoff under six artificial simulated rainfall intensity（31.8-114.0 mm·h-1）.In bamboo timber forest,the total runoff volume and runoff coefficient were higher,but the runoff sediment content and the total sediment yield were far lower,as compared with those in bamboo shoot forest.The runoff TN concentration in bamboo shoot forest decreased with increasing rainfall intensity.Under the same rainfall intensity,the runoff TN concentration in bamboo shoot forest was 5-6 times of that in bamboo timber forest.The runoff TP concentration was higher in bamboo timber forest than in bamboo shoot forest,but the TP loss from the sediment runoff in bamboo shoot forest was hundreds times of that in bamboo timber forest.During the processes of the TN and TP losses from the sediment runoff,the TN and TP concentrations at the prophase of runoff yield played a cardinal role,while the runoff volume and sediment yield at the anaphase played a decisive role.
出处
《应用生态学报》
CAS
CSCD
北大核心
2012年第4期881-888,共8页
Chinese Journal of Applied Ecology
基金
浙江省低丘缓坡水土流失防治对策项目(RI0701)资助
关键词
竹林坡地
人工模拟降雨
径流系数
径流含沙量
总氮浓度
总磷浓度
bamboo forest slope land
artificial simulated rainfall
runoff coefficient
runoff sediment content
total nitrogen concentration
total phosphorous concentration.
