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2010年10月26日—2011年4月18日在川西亚高山地区季节性冻融期间,选择典型的红桦-岷江冷杉林,采用凋落物分解袋法调查了不同网孔(0.02、0.125、1和3mm)凋落物分解袋内的凋落物质量损失,分析微型、中型和大型土壤动物对红桦凋落叶分解的贡献.结果表明:在季节性冻融期间,0.02、0.125、1和3mm分解袋内的红桦凋落叶质量损失率分别为11.8%、13.2%、15.4%和19.5%,不同体径土壤动物对红桦凋落叶质量损失的贡献率为39.5%;不同孔径凋落物袋内土壤动物的类群和个体相对密度与凋落叶的质量损失率的变化趋势相对一致.在季节性冻融的初期、深冻期和融化期,不同土壤动物对红桦凋落叶质量损失的贡献率为大型土壤动物(22.7%)>中型土壤动物(11.9%)>微型土壤动物(7.9%).季节性冻融期间土壤动物活动是影响川西亚高山森林凋落物分解的重要因素之一.
From October 26, 2010 to April 18, 2011, during the period of seasonal freeze-thaw in the sub-alpine region of western Sichuan, a typical red birch-Abies faxoniana forest was selected. The litter decomposition bags were used to investigate the effects of different meshes (0.02, 0.125, 1 and 3 mm) litter decomposition bags, and analyzed the contribution of micro, medium and large soil animals to the litter decomposition of Betula platyphylla.The results showed that during the period of seasonal freezing and thawing, 0.02, 0.125, 1 and 3 mm decomposed The mass loss rates of litters in the bag were 11.8%, 13.2%, 15.4% and 19.5%, respectively. The contribution rates of different size soil animals to the litters were 39.5% The relative density of taxonomic groups and individuals showed a relatively consistent trend with the rate of mass loss of litter.At the beginning of seasonal freezing and thawing, the contribution rate of different soil animals to the mass loss of Betula luminifera leaves was large Soil fauna (22.7%)> Medium soil fauna (11.9%)> Micro soil fauna (7.9%). Soil fauna activity during seasonal freezing and thawing was one of the important factors that affected the decomposition of litter in subalpine forests in western Sichuan.