山核桃林闭合区内径流氮磷流失特征  

Nitrogen and phosphorus loss in runoff and sediment for a closed zone of a Carya cathayensis stand

作　　者：王莺 陆荣杰 吴家森[1] 姜培坤 童志鹏 WANG Ying;LU Rongjie;WU Jiasen;JIANG Peikun;TONG Zhipeng(School of Environmental and Resource Sciences,Zhejiang A&F University,Hangzhou 311300,Zhejiang,China;Forestry Enterprise of Lin’an District,Hangzhou 311300,Zhejiang,China)

机构地区：[1]浙江农林大学环境与资源学院,浙江杭州311300 [2]浙江省杭州市临安区林业局,浙江杭州311300

出　　处：《浙江农林大学学报》2018年第5期802-809,共8页Journal of Zhejiang A&F University

基　　金：浙江省水土保持监测中心项目(ZSSJ/CG-201603018)

摘　　要：为研究自然降雨条件下整个水文年中山核桃Carya cathayensis林闭合区内径流-土壤-泥沙氮磷流失特征,以杭州市临安区山核桃林闭合区作为研究对象,测定总氮、总磷和水解氮等指标。结果表明:降雨是影响径流的重要因子,径流量和降雨量存在显著正相关(P<0.05);在2016年6月至2017年5月的观测期间,山核桃林径流水中氮素平均质量浓度较高(2.86 mg·L-1),水解氮是氮素流失的主要形式,占总氮的60.7%;径流水中磷素平均质量浓度较低(0.01 mg·L-1)。径流氮质量浓度与土壤碱解氮之间不存在显著的相关性(P>0.05),而径流磷质量浓度与土壤有效磷质量分数之间呈显著相关(P<0.05);径流中总氮和总磷的年累积流失量分别为11.01 kg·hm^(-2)·a^(-1)和133.70 g·hm^(-2)·a^(-1),泥沙中全氮和全磷的年累积流失量分别为11.49和1.12 g·hm^(-2)·a^(-1),山核桃林氮磷流失严重。This study was designed to determine the characteristics of nitrogen(N)and phosphorus(P)losses in runoff and sediment with only natural rainfall in a Carya cathayensis stand for a whole hydrological year.The closed zone of a C.cathayensis stand in Lin’an District of Hangzhou setted up a monitoring station for location monitoring was selected to measure total nitrogen(TN),total phosphorus(TP),and dissolved nitrogen(DN)from June 2016 to May 2017 and analyzed.Results showed a significantly positive linear correlation(r=0.940 6,P<0.05)between runoff and rainfall.During the observation period,the average concentration of N in runoff water was far higher(2.86 mg·L^-1)than mass concentration of eutrophication in water.DN in the runoff was a main form of N loss accounting for 60.7%of TN;whereas,the average concentration of P was lower(0.01 mg·L^-1)than concentration in other economic forest runoff.There was no significant relationship(P>0.05)between N concentration from runoff and soil available N,but P concentration from the runoff was significantly linearly related to available P(P<0.05).Accumulated loss of TN in the runoff was 11.01 kg·hm^-2·a^-1 and TP was 133.70 g·hm^-2·a^-1;whereas,accumulated loss of TN in the sediment was 11.49 g·hm^-2·a^-1 and TP was 1.12 g·hm^-2·a^-1.Thus,in the C.cathayensis stand,rainfall was an important factor affecting runoff with losses of N and P serious.

关 键 词：森林生态学 山核桃林 闭合区 径流 土壤 泥沙 氮磷 流失 

分 类 号：S718.55[农业科学—林学]