Study On Forest Multi-objective Management Planning Of National Reserve Forest In Jindong Forest Farm

In this study,the national reserve forest of Jindong Forest Farm in Yongzhou City,Hunan Province was taken as the research object.The growth models of stand basal area and volume of six kinds of stands with Chinese fir,Schima superba,Phoebe bournei,Castanopsis eyrei,Cinnamomum camphora and Quercus glauca were established.On this basis,the corresponding forest multi-objective management planning models are constructed,and the optimal forest management plans are obtained by LINGO software,which can provide a certain basis for the preparation of the forest multi-objective management plan of the Jindong Forest Farm national reserve forest.The main conclusions are as follows:(1)For reserve forest of six stand types,traditional method and non-linear measurement error method were used to establish stand basal area and volume growth models,respectively.The results show that the stand basal area and volume growth models fitted by the simultaneous equations using the non-linear measurement error method are not significantly different from the models fitted by the traditional method and the non-linear measurement error method can make the stand basal area and volume growth models more compatible.(2)Taking the largest timber harvest as the main management goal,and taking into account the ecological objectives of forest carbon sequestration,water conservation,soil conservation,the large-diameter Chinese fir reserve forest establishes a 0-1 integer programming model with the constraints of spatial adjacency and harvesting volume less than growth volume.The solution obtained the annual cutting sub-compartment arrangement for the next 50 years.The 50-year cumulative harvesting area is calculated to be 4707.66 square meters,the harvesting volume is 1.29 million cubic meters,and the output timber is 838853 cubic meters,the net present value of timber harvest is 386.23 million yuan,the increment of carbon storage is 144525.16 tons,the increment of water conservation is 86738.01 tons,and the increment of conservation soil is 4755.96 tons.(3)Taking timber harvesting,forest carbon sequestration,water conservation and soil conservation as management objectives,and taking selective cutting intensity and number index of undergrowth vegetation species not decreasing as constraints,a multi-objective planning model for reserve forest of rare tree species such as Schima superba,Phoebe bournei,Castanopsis eyrei,Cinnamomum camphora,Quercus glauca was established.By giving different weights to each goal through the analytic hierarchy process,four different managenment plans are obtained.After solving,we can obtain the selective cutting arrangement of the four schemes in the next five planning stages and choose the management scheme with the largest objective function value and the largest net present value as the optimal scheme.The objective function values of scheme one to scheme four are 0.9032,0.9150,0.9074,0.9034 and the net present value of scheme one to scheme four are 57.87 million yuan,76.33 million yuan,47.40 million yuan,52.75 million yuan.Therefore,we choose scheme two as the optimal option for multi-objective programming of rare tree species reserve forest,that is,the target weight of wood harvesting is 0.4,the target weight of forest carbon sequestration,water conservation and soil conservation is 0.2.This scheme can play the ecological function of the forest while harvesting timber,which is a reasonable scheme.