Effects of soil nematodes communities on litter decomposition in urban forest of Dalian
i In order to further expound the effect of soil nematodes on litter decomposition in urban forest,this study investigated the responses of soil nematodes communities to litter decomposition by litterbags technology at different mesh sizes in Dalian National Forest Park.Soil nematodes community composition,decomposition rate of litter and nutrient release were also analyzed.It found a total of 4 418 nematodes from 39 genera.Higher relative density of soil nematodes was found in the bags with 0.1 mm mesh size (1.55 individuals and 7.34 orders per g of dry litter) compared to the bags with 0.02 mm mesh size (0.21 individuals and 0.49 orders per g of dry litter).There were very few soil nematodes in the 0.02 mm litter bags.Thus we regarded that soil nematodes only affected the 0.1 mm litter bags.The mass loss rates as well as C and P release rates was higher in litter bags with 0.1 mm mesh size than in those with 0.02 mm mesh size,indicating a significant influence of soil nematodes on mass loss and nutrient release.The contribution of soil nematodes to the litter mass loss was about 24％.The effect of soil nematodes on the nutrient release rates differed among elements.The soil nematodes had a bigger influence on the release rate of N than that of other elements,whereas the influence on K release rate was the lowest.The results showed that soil nematodes communities has a significant effect on the litter decomposition and nutrient release of the forest litter in Dalian city,especially promoting the mass loss rates and N release rates.
NETL
NSTL
万方数据
维普
