摘要
在东北羊草草原上，采用模拟不同梯度凋落物量，探讨凋落物层对土壤生物类群、数量和生物量的影响。结果表明，随着凋落物积累量的增加，土壤动物的类群数、数量和生物量变化呈先增加后减少的趋势。类群数峰值出现在500g／m^2处，数量的峰值在700g／m^2处，生物量峰值在600g／m^2处。土壤微生物的数量和生物量的变化也呈先增后降的趋势，细菌量的峰值出现在700g／m^2处，放线菌和真菌数的峰值在600g／m^2处；生物量的峰值在600g／m^2处。凋落物量对土壤生物的影响有正负效应，在一定范围内起促进作用，当凋落物量〉700g／m^2时起抑制作用。凋落物积累量的最佳范围为600-700g／m^2，在此范围内土壤生物可良好的生长发育。
Influences of different levels of litter on quantities, species and biomass of soil organisms in northeastern Leymus chinensis grassland of China were studied. The results showed that quantities, species types and biomass of soil animals increased with the increasing of litter layer at lower levels, while decreased at higher levels. The highest values of quantities, species types and biomass of soil animals presen- ted at 500g·m^-1 ,700g·m^-2 and 600g·m^-2 , respectively. Quantities and biomass of microorganisms in soil had the similar trends with those of soil animals. The quantities of bacteria, actinomycete and fungi presented at 700 g· m^-2 and 600 g· m^-2 , respectively. The highest biomass value of microorganisms presented at 600 g· m^-2. Litter had positive--negative effects on soil organisms, it can improve their growth at the optimal levels of litter; but when litter levels were more than 700g· m^-2 , it had inhibitory effects. The optimal levels of litter was at the scope between 600 to 700g· m^-2 , in which the soil organisms developed welt.
出处
《中国草地学报》
CSCD
2008年第5期7-12,共6页
Chinese Journal of Grassland
基金
国家自然科学基金资助项目(30570273)
东北师范大学测试基金项目
关键词
凋落物层
土壤动物
土壤微生物
羊草草原
Litter
Soil animal
Soil microorganism
Leymus chinensis grassland
