秦岭南坡不同林分类型枯落物层和土壤层水文功能综合评价OA北大核心CSTPCD

In order to explore the differences in hydrological function of the litter and soil layers in typical forest stands occurring in the Qinling Mountains,the indoor re-soaking and the ring knife method were used to examine the water-holding characteristics of litter and soil layers in Pinus tabuliformis,Quercus aliena var.acuteserrata and Larix principis-rupprechtii forests in Huoditang of Qinling Mountains.Prin-cipal component analysis and entropy weight method were used to comprehensively evaluate the hydrologi-cal function of the three forest stands.The results showed that 1)the thickness and accumulation of litter layer in the three stands ranged 3.11-7.44 cm and 5.58-10.02 t·hm-2,respectively,and the Q.aliena var.acuteserrata forest had the thickest litter layer,and L.principis-rupprechtii forest accumulated the highest amount of litter.2)The natural water content,maximum water holding rate,maximum water hold-ing capacity,and effective storage capacity of litter layer under three forest stands were 12.54％-102.59％,185.93％-557.7％,14.41-17.8 t·hm-2,and 7.66-14.34 t·hm-2,respectively.Among them,the Q.aliena var.acuteserrata forest had the highest maximum water-holding capacity and intercep-tion capacity,while the L.principis-rup prechtii forest performed the best in terms of natural water con-tent and maximum water-holding rate.3)The soil bulk density in the three stands increased with soil depth,with values ranging from 0.89 to 1.21 g·cm-3.The soil water storage in the P.tabulaeformis for-est was the lowest,while the L.principis-rupprechtii stand had the highest total porosity and capillary porosity of the soil.The maximum water capacity in the 0-40 cm soil of the three stands was in the order of L.principis-rupprechtii(257 mm)＞P.tabuliformis(234 mm)＞Q.aliena var.acuteserrata(231 mm).Based on the comprehensive evaluation of entropy weight method,the Q.aliena var.acuteserrata forest performed the best in the retention capacity of litter,while the L.principis-rupprechtii forest had the best water retention function in the soil layer.Therefore,it is recommended to reasonably optimize the tree species allocation in future forest management to better utilize its water conservation capacity in this area.