摘要
为研究不同土地利用方式下土壤呼吸空间变异的影响因素,进行野外观测试验,测定了土壤呼吸及相应的环境、植被、土壤因子,分析了土壤呼吸的空间变异性及其与这些因子之间的内在联系.结果表明,土地利用方式对土壤呼吸具有重要影响,不同土地利用方式下,土壤呼吸存在显著性差异(P<0.001),土壤呼吸速率在1.82～7.46μmol·(m2.s)-1范围内,最高值与最低值相差5.62μmol·(m2.s)-1.在本研究中,土地利用方式对土壤呼吸的影响作用大于土壤温度、湿度等环境因子.土壤有机碳是影响土壤呼吸空间变异性的关键因子,在所有观测的生态系统中,土壤呼吸与有机碳含量之间的关系均可用幂函数描述.在森林生态系统中,土壤呼吸与观测地点树木胸径(DBH)之间的关系可用对数方程描述.胸径大小体现了树木生长时间的长短.综合土壤有机碳含量(C,%)、有效磷含量(AP,g·kg-1)及胸径(DBH,cm)这3个因子的模型可模拟森林土壤呼吸(Rs)92.8%的空间变异.
In order to investigate the factors influencing the spatial variability in soil respiration under different land use regimes, field experiments were performed. Soil respiration and relevant environment, vegetation and soil factors were measured. The spatial variability in soil respiration and the relationship between soil respiration and these measured factors were investigated. Results indicated that land use regimes had significant effects on soil respiration. Soil respiration varied significantly （P 〈 0. 001 ） among different land use regimes. Soil respiration rates ranged from 1.82 to 7.46 p, mol.（ma.s） 1, with a difference of 5.62 μmol·（m2.s）-1 between the highest and lowest respiration rates. Soil organic carbon was a key factor controlling the spatial variability in soil respiration. In all ecosystems studied, the relationship between soil respiration and soil organic carbon content can be described by a power function. Soil respiration increased with the increase of soil organic carbon. In forest ecosystem, the relationship between soil respiration and diameter at breast height （DBH） of trees can be explained by a natural logarithmic function. A model composed of soil organic carbon （C,%）, available phosphorous （AP, g·kg-1） and diameter at breast height （DBH, cm） explained 92.8% spatial variability in soil respiration for forest ecosystems.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2013年第3期1017-1025,共9页
Environmental Science
基金
国家自然科学基金项目(41005088
41175136)
中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室开放课题项目(LAPC-KF-2010-09)
关键词
土地利用方式
土壤呼吸
土壤有机碳
植被
温度
land use regimes
soil respiration
soil organic carbon
vegetation
temperature
