洞庭湖湿地土壤有机质空间分布及其相关性研究  

Study on Spatial Distribution and Correlation of Soil Organic Matter in Wetland of Dongting Lake Floodplain

作　　者：杜冠华[1] 李素艳[1] 郑景明[2] 王灵艳[3] 郑永魁 

机构地区：[1]北京林业大学水土保持学院,北京100083 [2]北京林业大学教育部北京市共建森林培育与保护重点实验室,北京100083 [3]北京林业大学自然保护区学院,北京100083 [4]广西林业勘测设计院,广西南宁530011

出　　处：《现代农业科学》2009年第2期21-23,32,共4页

基　　金：科技支撑项目(2006BAD03A15)

摘　　要：以洞庭湖湿地的泥沙滩地、湖草滩地、芦苇滩地和集成垸人工杨树林为研究对象。研究了不同湿地类型的土壤有机质含量的统计学特性、土壤有机质的水平分布、垂直分布特征以及其与pH值、土壤水分和容重等指标的相关性。结果表明,4类湿地类型土壤有机质差异显著;湿地表层土壤有机质的水平分异为:湖草滩地(33.04±10.86)g/kg>芦苇滩地(23.23±4.78)g/kg>杨树林地(16.92±3.44)g/kg>泥沙滩地(4.60±0.59)g/kg,除泥沙滩地外,其他3类土壤有机质含量和人为干扰因素呈负相关关系;土壤有机质的垂直分异为:除泥沙滩地外,湖草滩地、芦苇滩地和杨树林地的土壤有机质含量都是从上到下依次递减;湿地土壤有机质与pH值呈显著负相关关系(0.05水平),Pearson相关系数为-0.594;有机质和土壤水分呈极显著的正相关关系(0.01水平),Pearson相关系数为0.830;土壤有机质与容重呈极显著的指数负相关关系(P<0.01),回归方程为:Y=367.308e-2.462X(R=-0.885,N=43)。The statistics characteristics,horizontal distribution and vertical distribution of soil organic matter and correlation with PH ,soil water content and bulk density in 4 types wetlands of Dongting Lake Floodplain were studied. Results showed that there were significant differences of soil organic matter in 4 type wetlands： the horizontal distribution of soil organic matter was Carexspp-dominated floodplain（33.04 ± 10.86）g/kg Phragmites-dominated floodplain（23.23 ± 4.78）g/kg the man made populus-dominated floodplain（16.92 ± 3.44）g/kg mud and sand-dominated floodplain （4.6 ± 0.59）g/kg, and there were negative relationship with human disturbances except for the mud and sand-dominated floodplain, the vertical variation of soil organic matter was reduced with increasing depth from 0 to 60cm except for the mud and sand-dominated floodplain,there were negative relationship （R=-0.594＊,P 0.05）between soil organic matter and PH, a significant positive relationship （R=0.830＊＊,P 0.01） between soil organic matter and soil water content, and a significant negative index relationship （P 0.01） between soil organic matter and bulk density,the regression equation was Y=367.308e-2.462X （R=-0.885, N=43）.

关 键 词：湿地 土壤有机质 空间分布 相关性 容重 

分 类 号：S153[农业科学—土壤学]