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 1年的观测 ,并通过多元回归分析了土壤CO2 排放速率与 5个环境因子间的关系。结果表明 ,阔叶红松林土壤CO2 排放与表层无凋落物的土壤CO2 排放速率在测定年度内具有相同的季节变化趋势。在不同的月份中 ,以 7月份最高 ,2月份最低 ;在夏季 18∶0 0为土壤日CO2 排放的最高峰 ;土壤CO2 排放速率与 5个环境因子进行多元回归的结果显示 :林地土壤CO2 排放速率与地表温度和地下 2 0cm土壤湿度呈显著正相关。根据气象资料推算 ,阔叶红松林的年凋落物和土壤CO2排放通量分别为 2 80 4 gCO2 ·m-2 ·a-1和 3911gCO2 ·m-2 ·a-1。阔叶红松林凋落物排放CO2年通量占土壤林地CO2 排放总量的 2 8%。
The soil CO 2 emission fluxes in two treatments in the broad-leaved & Korean pine (Pinus koreansis) forest of Changbai Mountain were evaluated with closed static chamber technique. The results showed that there were similarly seasonal variation trends for soil CO 2 emission rates in soil and litter-free soil. The maximum soil CO 2 emission was in July and the minimum was in February. In summer the peak for diurnal CO 2 emission occurred at 14∶00～18∶00 p.m. Effects of 11 environmental factors on soil CO 2 emission fluxes were examined by multivariate analysis of variance. Results showed that soil CO 2 emission rate was positively correlated to the temperature at 0 cm depth and soil moisture at 20 cm depth in the broad-leaved & Korean pine forest. The annual soil respiration amount was estimated as 3?911 g CO 2· m -2·ya -1 for soil with litters and 2?804 g CO 2·m -2·yr -1 for litter-free soil respectively. CO 2 emission amounting from the litters accounted for 28% of total soil CO 2 emission.
出处
《生态学杂志》
CAS
CSCD
北大核心
2004年第5期24-29,共6页
Chinese Journal of Ecology
基金
国家重点基础研究发展规划项目(G1999043407)
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)
关键词
静态箱法
土壤CO2排放
阔叶红松林
closed static chamber, soil CO 2 emission, broad-leaved Korean pine forest.
