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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.
Li-6400 soil respiration supporting system was used to study the soil respiration characteristics of litter retained and removed under different land use patterns in the Sanjiang Plain marsh wetland. Then the litterfall contribution to soil respiration under different land use patterns and its relationship with litterfall input The results showed that the average contribution of litter to soil respiration was -0.21 ~ 0.64μmol / (m2.s) in four land use patterns during the whole growing season The contribution rate of litter meadow wetland (14%)> plantation land (12%)> soybean field (8%)> returning farmland to wetland (-5%), among which, Contribution to the negative values, reducing the soil respiration emissions, suggesting that the contribution of litter to soil respiration may ultimately depend on the balance between litter decomposition and shielding effects.In addition to soybean field, litter under different land use patterns of soil respiration (P <0.01) .In addition, the effect of rainfall is closely related to litterfall input, indicating that litter may participate in the ecological effects of climate change in addition to its own decomposition .