Wang Li-Li, Song Chang-Chun, Guo Yue-Dong, Liu De-Yan, Yang Gui-Sheng
Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China.
Huan Jing Ke Xue. 2009 Nov;30(11):3130-5.
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 micromol/(m2 x 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.
利用Li-6400土壤呼吸系统，研究了三江平原不同土地利用类型下有凋落物和无凋落物时土壤呼吸的特征，以探讨凋落物对土壤呼吸的贡献及其与凋落物输入和环境因子的关系。结果表明，在四种土地利用类型的生长季节，凋落物对土壤呼吸的平均贡献范围为-0.21至0.64微摩尔/(平方米·秒)。贡献率顺序如下：湿地(14%)>人工林(12%)>大豆田(8%)>弃耕地(-5%)。对于弃耕地，该值为负，凋落物抑制土壤呼吸。凋落物对土壤呼吸的贡献可能取决于凋落物分解与其对土壤呼吸的屏蔽效应之间的平衡。除大豆田外，凋落物对土壤呼吸的贡献与10厘米深度土壤温度之间存在极显著相关性。此外，降雨与凋落物输入相关的影响表明，除了分解作用外，凋落物未来可能会参与气候变化的生态效应。
