阔叶树种引入对低质低效马尾松林枯落物与土壤持水性能的影响OA

In order to investigat effects of introducing different broad-leaved tree species on water-holding ca-pacities of litter layers and soil layers in low-quality and low-efficioncy Pinus massoniana plantations,and provid scientific basis for construction and transformation of multi-layer coniferous-broadleaved mixed planta-tions as well as promotion of their water conservation functions,taking P.massoniana×Castanopsis hystrix(PCH),P.massoniana×Michelia macclurei(PMM),P.massoniana×Xanthostemon chrysanthus(PXC),P.masso-niana×Erythrophleum fordii(PEF)and P.massoniana×Mytilaria laosensis(PML)as research objects,taking P.massoniana pure plantation(Pnm)as control,variations in water-holding capacities of litter layers and soil lay-ers in different stands after mixed transformation were analyzed.Results showed that litter storages of undecom posed layers were higher than those of semi-decomposed layers in six stands.Total litter storage showed as PCH>PML>PXC>Pnm>PEF>PMM.Water-holding rate of litter layer was logarithmically related to immersion time,while water absorption rate was power-functional to immersion time.Maximum water-holding capacity,maxi-mum interception storage capacity and effective interception storage capacity of litter layer all showed as PCH>PXC>PML>Pnm>PMM>PEF.Maximum water-holding rate,capillary water-holding rate,non-capillary porosi-ty,total porosity,saturated water storage capacity and effective water storage capacity in 0-20 cm soil layer were the highest in PML stand,whereas effective water storage capacity and total effective water storage capaci-ty in 20-40 cm soil layer peaked in PCH stand.Stand comprehensive water storage capacity showed as PCH>PML>PEF>PXC>PMM>Pnm.Soil constituted core carrier that fulfilled water conservation functions of stands.It was recommended that C.hystrix could be preferentially intercropped,followed by M.laosensis,for transfor-mation of low-quality and low-efficiency P.massoniana plantations in Hongchaojiang reservoir area.