广西林业科学2018，Vol.47Issue(1)：6-12,7.
石漠化区蚬木天然林土壤呼吸动态变化及其影响因素
Dynamic Change and Controlling Factors of Soil Respiration in Excentrodendron hsienmu Forest in Karst Areas
摘要
Abstract
Excentrodendron hsienmu forest was the most representative climax community of monsoon forest in limestone region in southwest of Guangxi.However,the studies of carbon cycle in E.hsienmu ecosystem were insufficient so far.Soil respiration and its environmental factors had been measured and analyzed in E.hsienmu forest to reveal the dynamics and driving mechanism of E.hsienmu ecosystem.Results showed that soil respira-tion rate had positive relationship with soil temperature during daytime,and the relationship reached signifi-cant level in November.Soil respiration rate varied markedly during the year with higher rates in summer and lower rates in winter. The two-factors model based on daily minimum air temperature and soil moisture had best fitting effect for soil respiration rate,and could explain 71.0% variation of soil respiration.The CO2 flux of soil respiration calculated by single-factor model based on daily minimum air temperature was 54.61 t/(hm2· a).The CO2flux of soil respiration was 12.95 t/(hm2·a)while taking out bare rock covers of surface.The dy-namic change of soil respiration of E.hsienmu was similar to the forest with the same climate zone.Considered the soil cover,the CO2flux of soil respiration reached relative high level.关键词
石灰岩地区/蚬木林/土壤呼吸/时间动态Key words
limestone region/Excentrodendron hsienmu forest/soil respiration/temporal variation分类
农业科技引用本文复制引用
郑威,申文辉,何琴飞,何峰,谭长强..石漠化区蚬木天然林土壤呼吸动态变化及其影响因素[J].广西林业科学,2018,47(1):6-12,7.基金项目
广西林业科技项目(桂林科研[2015]第34号) （桂林科研[2015]第34号）
广西优良用材林资源培育重点实验室自主课题(14-A-04-02) （14-A-04-02）
