喀斯特峰丛洼地植被不同演替阶段土壤磷酸酶活性  

Soil alkaline phosphatase activity at different vegetation succession stages in karst peak-cluster depression

作　　者：舒世燕[1,2,3] 王克林[1,2] 张伟[1,2] 何寻阳[1,2] 刘淑娟[1,2,3] 韦国富[4] 

机构地区：[1]中国科学院亚热带农业生态研究所,亚热带农业生态过程重点实验室,长沙410125 [2]中国科学院环江喀斯特生态系统观测研究站,广西环江547100 [3]中国科学院研究生院,北京100049 [4]广西木论国家级自然保护区管理局,广西环江547100

出　　处：《生态学杂志》2010年第9期1722-1728,共7页Chinese Journal of Ecology

基　　金：中国科学院西部行动计划项目(KZCX2-XB2-08);国家自然科学基金项目(30800162;30970538);国家支撑计划喀斯特生态农业基金项目(2006BAC01A10;2009BADC6B008);中国科学院知识创新工程青年人才领域前沿资助项目(ISACX-LYQY-QN-0704)

摘　　要：以桂西北典型喀斯特峰丛洼地为试验对象,研究了4个不同植被演替阶段土壤碱性磷酸酶活性及其与土壤理化性质的关系。结果表明:土壤磷酸酶活性随演替阶段和土层深度变化显著;随坡位变化不显著。不同演替阶段土壤磷酸酶活性表现为原生林>次生林≈乔灌林>草地;磷酸酶活性随土壤深度的增加而降低,且各层次之间差异显著。相关分析表明:磷酸酶活性与土壤有机质、全氮、全磷、碱解氮、速效磷、速效钾、pH值、粉砂、砂粒含量存在显著的正相关;与土壤全钾、容重、粘粒含量呈负相关。典范对应分析(CCA)结果表明:演替阶段和裸岩率对土壤磷酸酶活性影响很大;坡位、坡度和坡向也有一定影响。This paper studied the variation pattern of soil alkaline phosphatase activity and its relationships with soil physical and chemical properties at four different stages of vegetation succession in a typical karst peak-cluster depression of northwest Guangxi,China. Succession stage and soil depth had significant effects on the soil alkaline phosphatase activity,but slope position had less effects. During the succession of original forest-secondary forest,bush forest-grass,and with the increase of soil depth,the soil alkaline phosphatase activity decreased,and had significant difference among different soil layers. The soil alkaline phosphatase activity had significant positive correlations with soil pH and soil organic matter,total N and P,available N,P,and K,silt,and sand contents,and significant negative correlations with soil bulk density and soil total K and clay contents. The canonical correspondence analysis （CCA） showed that succession stage and bare rock rate had primary effects on soil alkaline phosphatase activity,while slope gradient,slope position,and slope direction also had great effects on it.

关 键 词：喀斯特 土壤磷酸酶活性 植被演替 

分 类 号：S154.2[农业科学—土壤学]