Litter Reserves and Water Holding Characteristics of Different Species in Yunnan Plateau
During the recovery of degraded mountain ecosystem,litter 1ayer becomes the important intermediate link between the vegetation and soil circulation of materials and energy flow, and it has important effect of hydrology. The paper analysed hydrological functions of litter of the different forest types in degraded mountain ecosystem of Yunnan plateau through investigating five typical plant communities and the factors including return quantity and volume of litter, and performance of holding water. The results showed that: (1)Litter return quantity of five typical forest types is between 1785.69 to 3869.42 kg·hm-2·a-1; the total volume of litter layer is 4.68 to 12.0 t·hm-2. Litter return quantity and amount are shown decreased from coniferous forest, the coniferous forests to broad-leaved forest. (2) The maximum water holding capacity is 11.49 to 41.02 t·hm-2; effective interception amount is 9.92 to 41.71 t·hm-2. (3) Different vegetation types and different levels of water holding capacity of litter are increasing rapidly in 1 h. Semi decomposed litter has been basically reached saturation after immersed for 8 h and the undercomposed litter uses 10 h to saturation. There is logarithmic relationship between water-holding capacity and soak time. And (4) water absorption rate of litter in 0.5 h is the highest and slowed down after 2 h. There is power function relationship between litter water absorption rate and soak time. The comprehensive analysis shows that: litter water holding capacity ofPinus armandii Franch +Pinus yunnanensis +Coriaria nepalensis mixed forest is the biggest. It is the best forest keep water conservation and has the best hydrological efficiency in these five forests.
国家科技期刊平台
NSTL
万方数据
维普
