中文摘要：

草坪草枯落物分解是城市绿地生态系统养分归还土壤的重要形式,为了解城市草坪草枯落物分解机制及土壤动物的贡献,采用分解袋法,测定不同孔径（0.02 mm、1 mm和3 mm）分解袋内白三叶枯落物的质量损失率,并分析不同体径及不同食性土壤动物对白三叶枯落物分解的作用.结果显示：白三叶枯落物分解迅速,仅需7个月即可分解完全;不同部位白三叶枯落物分解速率不同,叶〉根（P1 mm〉0.02 mm;不同体径土壤动物对白三叶枯落物质量损失的贡献率为大型土壤动物〉中小型土壤动物（P〈0.05）;不同食性的土壤动物参与了白三叶枯落物分解的各个阶段,从分解初期到分解结束,经历了植食性、菌食性、捕食性和腐食性营养功能类群的变化.上述表明,土壤动物与枯落物相互作用,一方面土壤动物推动了城市草坪草白三叶枯落物的分解,另一方面枯落物基质的变化也深刻影响着参与分解的土壤动物群落格局.

英文摘要：

Lawn grass litter decomposition is one of the important ways for nutrient recycle among the urban green land ecosystem. This investigation aimed to understand the mechanism of the litter decomposition and the effect of soil fauna on it with the litter bag experiment. The mass loss rate of Trifolium repens L. litter was analyzed through the litter bags of three different mesh sizes （0.02 ram, 1 mm and 3 mm）, and the effect of the soil fauna with the different diameter and trophic on the litter decomposition was investigated. Our result showed that the litter of T. repens L. was completely broken down within 7 months, with the decomposition rate of leaf litter faster than that of root litter. The litter mass loss rate of different mesh sizes was in the order of 3 mm 〉 1 mm 〉 0.02 mm. The participation extent of soil fauna with different diameters on the litter decomposition was in the order of macro-fauna 〉 meso-fauna 〉 micro-fauna. The soil animals with various feeding habits contributed to the whole decomposition process, with dominant group changing from phytophagy, to fungivore, predatism and saprophagy, along with the stages of decomposition. These results indicated an active interaction between litter and soil animals. Soil animals significantly contribute to the litter decomposition, meanwhile, the distribution of soil animal community itself is influenced by the transformation of litter substrates.