水土保持学报2009，Vol.23Issue(5)：237-242,6.
广西喀斯特次生林地表碳库和养分库特征及季节动态
Carbon and Nutrient Pools and Their Seasonal Changes of Forest Floor in Secondary Forest in Karst region of Guangxi
摘要
Abstract
Taking primary forest as contrast in Mulun natural reserve, we chose three secondary forests which represented different succession stages as shrub, vine-shrub and tree-shrub for studying their characteristics and seasonal dynamics of carbon and nutrients pools of forest floor in Karst region, Guangxi. After investigating the stocks of litters under forest, we analyzed organic carbon(OC), total nitrogen(TN), phosphor (TP) and potassium(TK) content of the litter layers and topsoi(O — 5 cm) in the end of February and August 2008. The results showed that: (1) Overall, the stocks of litters, OC and TN on forest floor increased as the succession going on; OC and nutrients content in topsoil had significant correlation with the stocks in litter layers except TP. (2) During the rainy season, the litters decomposed and released nutrients so fast that the decomposition amounts exceeded the input amounts; and the processes performed much faster in secondary forests than primary forest. (3) After rainy season, the stocks of OC and nutrients in litter layers decreased obviously in vine-shrub and tree-shrub, however the contents in topsoil showed more significant decrease in shrub and primary forest; it supposed that the self-sustaining ability of the secondary forests go upward and then downward as the succession progressing from shrub to climax stage.关键词
喀斯特/次生林/凋落物层/土壤表层/碳库和养分库Key words
Karst/secondary forests/litter layer/topsoil/carbon and nutrient pool分类
农业科技引用本文复制引用
朱双燕,王克林,曾馥平,曾昭霞,宋同清..广西喀斯特次生林地表碳库和养分库特征及季节动态[J].水土保持学报,2009,23(5):237-242,6.基金项目
中国科学院西部行动计划项目(KZCX2--XB2--08) （KZCX2--XB2--08）
国家"973"计划项目(2006CB4503208) （2006CB4503208）
中国科学院"西部之光"人才培养计划"西部博士资助项目"(0823045040) （0823045040）
