摘要
运用Li-6400土壤呼吸配套系统研究了三江平原沼泽湿地不同土地利用方式下保留和去除凋落物的土壤呼吸特征,进而分析了不同土地利用方式下凋落物对土壤呼吸的贡献及其与凋落物输入量和环境因子（温度、降水等）之间的相互关系.结果表明,整个生长季4种土地利用方式下凋落物对土壤呼吸的平均贡献量在-0.21~0.64μmol/（m2.s）之间,贡献率表现为小叶章草甸湿地（14%）〉人工林地（12%）〉大豆田（8%）〉退耕还湿地（-5%）.其中,退耕还湿后凋落物对土壤呼吸的贡献表现为负值,减少了土壤呼吸的排放,表明凋落物对土壤呼吸的贡献可能最终取决于凋落物分解与屏蔽作用之间的平衡.除大豆田外,不同土地利用方式下凋落物对土壤呼吸的贡献均与10 cm地温达到了极显著相关关系（p〈0.01）.另外,降雨的影响与凋落物输入密切相关,表明凋落物除自身分解外,还可能参与到气候变化的生态效应中.
By the soil respiration system of Li-6400, the characteristics of soil respiration with and without litter were investigated to explore the litter＇s contributions to soil respiration and its correlations with the input of litter and environmental factors under different land-use types in Sanjiang Plain. Results demonstrated that the average contribution of litter to soil respiration ranged from - 0.21 to 0.64 μmol/（m2·s） in the growing season under the four land-use types. The contribution rate showed in the following order： wetland（ 14% ） 〉 artificial forest（ 12% ） 〉 soybean field（8% ） 〉 abandoned land（ - 5% ）. As to abandoned land, the value was negative, and the litter inhibited soil respiration. The litter＇ s contributions to soil respiration may depend on the balance between the decomposition of litter and its shielding effects on soil respiration. There were highly significant correlations between litter＇ s contributions to soil respiration and soil temperature at 10cm depth except for soybean field. Moreover, the influence of rainfall associated with the input of litter, which suggested that besides decomposition litter may take part in the ecological effect of climate changes in the future.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2009年第11期3130-3135,共6页
Environmental Science
基金
国家重点基础研究发展计划(973)项目(2009CB421103)
国家自然科学基金项目(40771189
40701001)
作者简介
作者简介：王丽丽（1984-），女，博士研究生，主要研究方向为湿地环境变化与物质循环，E-mail：wangl10229@163．com
通讯联系人，E—mail：songcc@neigae.ac．cn
