生态环境学报2012，Vol.21Issue(5)：864-869,6.
土壤温度和湿度对鲁东南杨树人工林土壤呼吸的协同影响
Synergistic effects of soil temperature and moisture on soil respiration in Populus tremula plantations in southeast Shandong province
摘要
Abstract
Soil respiration, heterotrophic respiration and autotrophic respiration were investigated in middle-aged Populus tremula plantation (MAP) and mature Populus tremula plantation (MP) with portable infrared CO2 gas analyzer (GXH-3051) combined homemade closed chamber in Linyi, Shandong Province for two years to analyze the dynamics of soil respiration and its correlations to soil temperature and moisture, and finally to determine the synergistic effects of soil temperature and moisture on soil respiration. The results showed that: (l)The soil respiration in MAP and MP showed distinct seasonal dynamics with unimodal curve in the field. Soil respiration was highest in July (4.43 and 3.55 μmol·m-2s-1, respectively) and lowest in January (0.72 and 0.54 μmol·m-2s-1, respectively). (2)The correlations between soil temperature and soil respiration, autotrophic respiration, soil heterotrophic respiration were all exponential with R= aebT. and the correlations between soil moisture and soil respiration and its components were all linear with Y=kx+e. However, the effect of single factor on soil respiration and its components was under 81%. (3)The synergistic correlations between soil temperature, soil moisture and soil respiration were fit by the model R=aebTWc (R stands for soil CO2 efflux, T for soil temperature and W for soil water content at 0～10 cm soil depth, and a, b, c for tbe constants) . Soil temperature and moisture together could explain soil respiration, heterotrophic respiration and autotrophic respiration 83.3%～85.1%, 71%～79.2%, 58.6%～76.5% and 82.4%~88.3%, 68.9%～78.2%, 50.2%～78.2% of MAP and MP, respectively. The results showed that the double factor model was better than single factor model. Therefore, soil respiration was affected synthetically by soil temperature and moisture of MAP and MP in field.关键词
土壤温度/土壤湿度/杨树人工林/土壤呼吸/协同影响Key words
soil temperature/ soil moisture/ Populus tremula plantation/ soil respiration/ synergistic effect分类
农业科技引用本文复制引用
董彬..土壤温度和湿度对鲁东南杨树人工林土壤呼吸的协同影响[J].生态环境学报,2012,21(5):864-869,6.基金项目
国家自然科学基金项目(41072139) （41072139）
山东省自然科学基金项目(ZR2010CL001) （ZR2010CL001）
