摘要
采用碱吸收法,于2002年4月13-16日(晴)、8月21-24日(晴)对路南石林地区次生草地及柏树林下的土壤呼吸进行了野外监测,同时收集其碳稳定同位素样品进行室内质谱仪分析。结果显示:土壤呼吸速率日动态特征表现为夜间高于白天,8月份土壤呼吸速率高于4月份;4月份的草地系统土壤呼吸的碳稳定同位素日平均值偏轻,而柏树林系统土壤呼吸的碳稳定同位素日平均值则是8月份的偏轻;土壤呼吸与其碳稳定同位素值成负相关,草地系统的相关程度,4月份的较8月份的高;柏树林系统的相关程度,则是8月份较4月份的高。这揭示了土壤呼吸及其碳稳定同位素交换对环境变化的敏感性,且不同的生物系统有不同的表现特征。
With the alkaline-sorption method, the diurnal changes of soil respiration were monitored in Lunan Stone Forest, Yunnan province. In the meanwhile, the carbon stable isotope (CSI) samples were collected and taken to laboratory, the CSI values were examined by the mass spectrometer (MAT-251). The fine days from 13 to 16, April and 21 to 24, August were selected as the monitoring period. The field works were carried out in grass and cypress community. The results show that the rate of soil respiration at daytime is lower than that at night, and it is higher in August than that April; the diurnal average value of carbon stable isotope is relative lighter in April in grass community but heavier in April in cypress community. The soil respiration keeps the negative correlation with its carbon stable isotope value, i.e. it is larger in April in grass community but larger in August in cypress community. This suggests the changes of soil respiration and carbon stable isotope are sensitive to surrounding environments. Moreover, the difference of carbon cycle and isotope exchange exists in cypress community and grass community.
出处
《中国岩溶》
CAS
CSCD
北大核心
2005年第1期23-27,40,共6页
Carsologica Sinica
基金
国家自然科学基金(编号:40372116
40231008)
石林科学基金项目(编号:200002)资助
