滇池底泥中氮素空间分布异质性分析  

Spatial Heterogeneity of Nitrogen Distribution in Sediment of Dianchi Lake

作　　者：戎静[1] 庄舜尧[2] 杨浩[1] 

机构地区：[1]南京师范大学地理科学院,江苏南京210046 [2]中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室,江苏南京210008

出　　处：《水土保持通报》2010年第3期10-15,20,共7页Bulletin of Soil and Water Conservation

基　　金：国家自然科学基金项目"滇池流域退耕还林工程对侵蚀产沙响应的多同位素联合示踪研究"(40873071);教育部高等学校博士学科点专项科研基金资助课题(2006319006)

摘　　要：采用传统统计与地统计学相结合的方法,对滇池底泥0—5,5—10,10—20cm中的全氮、有机氮、铵态氮进行了空间变异特征研究。结果表明,3层底泥中不同形态氮的空间变异性均较大。结构性因素对0—5cm底泥中全氮影响比较大,而随机性因素和结构性因素对0—5cm和10—20cm这两层底泥中的铵态氮以及10—20cm中的3种形态氮的影响相近。从整个滇池来看,3层底泥中3种形态氮的含量均呈现自北向南递减,各种形态氮均在湖泊中心出现较深颜色的斑块,说明底泥氮有向湖泊中间沉积的趋势。同时随着深度的增加,3种形态氮在空间分布的颜色深浅是0—5cm>5—10cm>10—20cm,可见底泥中氮的累积逐年增加,滇池污染有加重的倾向。Combined with the traditional and geostatistical methods,the distribution pattern of three forms of total,organic,and ammonium nitrogen in the sediment of Dianchi Lake was studied.Results showed that the spatial variation of various nitrogen forms in the sediment was great.The structural factor exerted a great impact on the total N distribution in the layer of 0—50 cm,while the stochastic factor and structural factor showed a similar impact on the other N forms.Generally,the content of all N forms in the sediment decreased from the north to the south.Dark spot color was present in the center of the lake,indicating various N deposited preferentially in the lake center.Meantime,the spot color became light with the increasing depth,which suggested that the lake was polluted severely with the time.

关 键 词：滇池 底泥 氮素 空间变异 

分 类 号：S158.2[农业科学—土壤学]