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凋落物分解主场效应是指凋落物具有在其生长的栖息地比在别的生境分解更快的特征,土壤生物的特化作用被认为是主场效应的产生机理。主场效应是除基质质量和物理化学环境外控制凋落物分解的重要因子,可影响模拟精度的8%。凋落物分解主场效应驱动机制的深入研究对促进分解模型中纳入生物因子,提高区域尺度模拟精度具有重要作用。虽然时间和基质质量可导致主场效应强度变化,但不能全面解释主场效应强度差异特别是负效应的产生。通过分析凋落物分解过程中土壤生物的作用机理,指出凋落物分解主场效应的土壤生物驱动可能包括土壤微生物的调节性适应,土壤动物的后期插入以及物理化学环境的间接影响。为深入了解主场效应土壤生物驱动机制,更好地模拟凋落物分解过程,提出延长凋落物分解交互移置实验时间,拓展实验空间,结合室内模拟分析和构建分解模型等方法与途径。
The main effect of litter decomposition is that litter has the characteristic of faster decomposition in its growing habitat than in other habitats. The specialization of soil organisms is considered as the mechanism of the home-effect. Home effect is an important factor that controls litter decomposition in addition to the matrix quality and the physical-chemical environment and can affect 8% of the simulation accuracy. In-depth study on the driving mechanism of litter decomposition home-effect has an important role in promoting the biologic factor in decomposition model and improving the accuracy of simulation at the regional scale. Although time and matrix quality can lead to changes in the home-effect intensity, it is not possible to fully explain the differences in home-effect intensity effects, particularly the negative effects. By analyzing the action mechanism of soil organisms during litter decomposition, it was pointed out that the soil bio-drive of litter decomposition may include the adaptation of soil micro-organisms, the later insertion of soil animals and the indirect impact of the physical and chemical environment. In order to further understand the mechanism of soil biological driving at home and better simulate the process of litter decomposition, some methods and approaches such as prolonging litter decomposition time, expanding experimental space, combining with indoor simulation analysis and building decomposition model are put forward.