摘要
采用静态封闭箱式技术对长白山阔叶红松林土壤CO2的排放通量进行一年的观测,通过多元回归分析了土壤CO2排放速率与8环境因子间的关系。结果表明:土壤CO2排放通量与土壤5 cm温度和0-20 cm平均土壤含水量(体积比)呈显著正相关。土壤呼吸与温度和含水量分别表现出幂函数和指数关系。土壤温度和含水量显著影响土壤呼吸的变化。当土壤含水量(体积百分比)大于25%时,土壤呼吸Q10值从1.14(含水量<25%)降低到1.09(含水量>25%)。在土壤含水量固定不变时,土壤温度能反映土壤呼吸的86%的变化。当土壤温度固定不变时,土壤含水量能反映土壤呼吸的32%的变化。建立土壤呼吸温度幂函数和含水量指数关系的非线性双因子模型。温度和水分双因子土壤呼吸模型能反映森林土壤呼吸的91%的时空变化。土壤呼吸温度和水分双因子模型估算的年土壤CO2排放通量比土壤呼吸Q10幂函数模型估算值高11%。
CO2 flux is released by soil measured by closed chamber and with gas chromatography technique in the woodland of the broad-leave Korean pine forest of Changbai Mountains for one year. The relationships between the releasing rate of soil and eight environmental factors are analyzed based on multiple regressions. The results show that the correlations of soil CO2 flux and soil water content （volumetric） form 0-20 depth, soil temperature at 5 cm depth indicate significantly positive among the relationships between soil CO2 flux and environmental factors. The correlations of the former are index exponent and the later are power exponent. Therefore, the soil temperature and the soil water content make a great impact on the variations of soil respiration. When the soil water content （volume percent） exceeds 25%, the Q10 of soil respiration reduces from 1.14 （soil water content less than 25%） to 1.09 （soil water content more than 25%）. The soil temperature can reflect 86% variations of soil respiration when the soil water content is in stable level, but contrary to soil moisture, it can only reflect 32% variations of soil respiration. However, when index of soil moisture and power of soil temperature are united into a non-lineafity double factors model, the model can reflect 91% variations of soil respiration. At the same time, estimation of released CO2 flux by soil on double models is 11% higher than estimation on power exponent model of Q10.
出处
《辽宁工程技术大学学报（自然科学版）》
EI
CAS
北大核心
2006年第2期297-300,共4页
Journal of Liaoning Technical University (Natural Science)
基金
中国科学院知识创新工程项目(KZ-CX-SW-01-01B-10)
国家自然科学基金资助项目(30271068
90411020)
关键词
阔叶红松林
土壤呼吸
土壤温度
土壤含水量
broad-leaves korean pine forest
soil respiration
soil temperature
soil water content
