【摘要】 全球变化研究中土壤的呼吸排放等成为科学家们关注的热点问题,影响土壤碳排放的一个最主要的因子是温度。本文研究了岩溶系统中两种典型植被条件下温度的日变化动态及其系统碳排放过程,并对碳排放的温度效应进行了研究,结果表明土壤温度与岩溶系统碳排放有显著相关,尤以草地生态系统为甚。森林生态系统中,与土壤呼吸排放有显著相关的温度因素为土表温度,且为负相关,表明土壤呼吸排放对该温度的滞后响应。林地、草地生态系统中5cm～15cm土壤温度与土壤呼吸碳排放显示出正效应,表明土壤温度促进土壤呼吸的碳排放。同时,草地生态系统中表层泉水碳排释与土下5cm土温也有极显著相关。即岩溶生态系统碳排放具有极显著的温度效应。更多还原

【Abstract】 In the study of globalchange, many scientists focused on soil respiration. One of the dominative factors that affected soil carbon discharge was temperature. Daily temperature dynamic and soil carbon discharge in two kinds of typical karst vegetation were monitored, and the relationship between soil carbon discharge and temperature was studied. Soil carbon discharge was significantly respondedto the change of soil temperature, especiallyin grassland ecosystem. In forest ecosystem, soil carbon discharge was negatively respondedto the change of soil surface temperature, which meant that soil carbon discharge was laggedto the change of soil surface temperature. Soil temperature of 5 to 15cm significantly sped up soil respiration in two typical karst vegetation, and soil temperature of 5cm was also markedly correlatedwith carbon discharge from karst spring in grassland ecosystem. The result indicated that there was a markedly correlationbetween carbon discharge in karst ecosystem and soil temperature.更多还原