西南喀斯特地区典型石漠化阶段土壤水肥关系研究  

Study on the soil water and fertilizer relationship in karst regions under typical rocky desertification stage,southwest China

作　　者：周炼川[1] 陈效民[1] 李孝良[1,2] 杨新强[1] 王晓洋[1] 黄代民[1] 

机构地区：[1]南京农业大学资源与环境科学学院,江苏南京210095 [2]安徽科技学院植物科学学院,安徽凤阳233100

出　　处：《南京农业大学学报》2011年第2期97-100,共4页Journal of Nanjing Agricultural University

基　　金：国家973计划项目(2006CB403205);国家大学生创新实验计划项目(081030720)

摘　　要：通过每两月一次的定位监测,对贵州喀斯特不同石漠化阶段的土壤水分含量、蓄持效应和养分动态进行了研究。结果表明:表层土壤含水量随着石漠化的发展而下降;土壤含水量随降雨具有明显的动态变化,但非石漠化土壤蓄持水分最高,达到最高值为589.1 g.kg-1;不同程度石漠化土壤不同深度含水量与土壤的铵态氮和硝态氮含量呈显著的正相关关系,表明有效养分供给与土壤水分有密切的关系。因此,土壤水分的短缺可能成为喀斯特土壤中养分供应的制约因素。The content and conservation of soil water and fertilizer under typical rocky desertification stage were studied through bi-monthly monitoring.The results were as follows：as the rocky desertification proceeded,soil surface water content decreased.The content of soil water varied with rainfall significantly,and it reached the highest value of 589.1 g·kg-1 in non-rocky desertification soil.The content of soil water had a significant relation with ammonium（NH4＋-N）and nitrate（NO-3-N）,and it indicated that effective nutrient supply and soil water were closely related.So the shortage of soil water can be constraints of nutrient supply in karst soil.

关 键 词：喀斯特地区 石漠化 水分变异 水肥关系 

分 类 号：X833[环境科学与工程—环境工程] S151[农业科学—土壤学]