Litter and Soil Hydrological Effects in Acacia mangium Plantation under Different Transformation Modes
To study the effects of different thinning intensities and interplanting of native broad-leaved tree species on the surface litter and soil water conservation of Acacia mangium plantation(25 years old)in South China,so as to provide near-natural management and ecological services for plantations of South China.Acacia mangium plantation in Dongguan Forestry Science Park in Dongguan Daling Mountain Forest Park was taken as the research object.Three thinning intensities were set as 0,30％,and 60％,numbered as A,B and D.After thinning,49 native broad-leaved tree species were interplanted evenly with the same measures,and pure Acacia mangium plantation without thinning and interplanting was taken as the control(NO.C).After 15 years of transformation,12 litter collectors were set up in each plot by typical plot survey method to collect litter.Surface soil(0-20 cm)was collected by ring knife method.The water holding capacity of litter and soil was studied by soaking and drying methods.The variation ranges of litter biomass,maximum water holding capacity,maxi-mum storage capacity and effective storage capacity of Acacia mangium plantation were 0.72-1.18 t·hm-2,17.70-28.64 t·hm-2,136.46-234.37 t·hm-2 and 113.32-195.37 t·hm-2,showing A>B>D>C.There were significant differences in different transformation modes(P<0.01).It was also found that the cumulative water holding capacity and soaking time had a significant three-time relationship,and the water absorption rate and soaking time had a significant reciprocal relationship.The cumulative water loss and water loss time showed an obvious three-time relationship,and the water loss rate and water loss time showed an obvious reciprocal re-lationship.The variation range of soil capillary porosity was 19.63％-26.85％.The variation range of non-cap-illary porosity is 13.94％-19.6％.The variation range of total porosity was 38.27％-43.84％.The variation range of soil bulk density was 1-1.09.The study also found that the higher the soil total porosity and capillary porosity,the better the soil water retention capacity.The results of this study showed that the effects of different thinning intensities and native broad-leaved tree interplanting on the hydrological effects of litter and soil were significant.From the perspective of stand quality and sustainable development of forest management,the model of combining thinning with interplanting has more advantages in increasing biodiversity,promoting forest regen-eration and succession,and improving the function of litter and soil water conservation.
万方数据
维普
