Comparative Study On Natural Forest Of State-owned Forest Farms In Different Regions Of Anhui Province

The natural forest value is the degree of describing the degree of similarity between the forest ecosystem and the original forest vegetation or the degree of human interference and destruction,and is an important indicator reflecting the quality of forest resources and ecological conditions.Research on the natural degree of forests can more accurately reflect the quality of forest resources and explore more scientific and effective forest management models.State-owned forest farms act as ecological barriers,transforming the direction of operation of state-owned forest farms,and promoting the development of state-owned forest farms.The transformation of wood production into ecological rehabilitation is the mainstay.State-owned forest farms have started to protect the environment,expand the development of forest resources,and are now focusing on ecological construction.purpose.The natural degree of the forest reflects the near nature of the forest,which can accurately determine the status of the forest ecosystem.This paper combines forest resources planning and design survey data of Anhui Province(2012-2015)and the 2017 forest management plan to compile data,this paper selects the factors that have a great influence on the natural forests of forests as the evaluation indicators,and constructs a forest natural degree evaluation index system for different areas of state-owned forest farms in Anhui Province,thereby implementing the natural forestry of state-owned forest farms.The main findings are as follows:(1)After sorting out the existing data,the evaluation criteria of the forest natural degree index system are the three aspects of human activity limitation factor,human activity(interference)factor,and forest status.After screening,altitude,slope,forest origin,forest types,forest land protection grades,tree species composition,stock volume per hectare,and average DBH of the forest were selected as indicator layers to construct natural forests of state-owned forest farms in different regions of Anhui Province.(2)Through the consultation of expert opinions,and then using the analytic hierarchy process(AHP),each weight value is calculated: The altitude weight value is 0.23;the slope weight value is 0.05;the origin weight value is 0.41;the forest type weight value is 0.06;the forest protection grade weight value is 0.16;the tree species weight value is 0.06;the volume weight value is 0.02;The average DBH weight value is 0.01.By referring to the results of existing experts and scholars at the same time,by consulting the experts of the forestry department,the assignment of qualitative indicators was obtained.(3)The higher the altitude,the steeper the natural value of the steep forest;Before the slope reaches the steep slope,as the slope increases,the greater the naturalness value,it gradually decreases at the steep slope;The natural degree of natural forest is much greater than the natural degree of plantation;The natural degree of protective forests and special-purpose forests is large,and the naturalness values of timber forests and economic forests are low;The natural degree gradually increases with the protection level of forest land;In the stand status,the more abundant the tree species,the larger the accumulation volume,and the greater the average DBH,the greater the natural value.(4)The natural forestry value of Dagongshan State-owned Forest Farm is 0.31;the natural forestry value of Jinsishan State-owned Forest Farm is 0.35;the natural forestry value of Xishan National Forest Farm is 0.36;the natural forestry value of Xiuning State Forest Farm is 0.56.The forest natural degree of Dagongshan State-owned Forest Farm,Golden Temple Mountain State-owned Forest Farm,and Xishan State-owned Forest Farm all belong to the IV degree of forest natural degree in Anhui Province.It belongs to the near-artificial state and the quality of forest resources is poor.The natural forests of state-owned forest farms in Xiuning County are in Level III and belong to a far-natural state.The quality of forest resources is relatively high.The natural forestry value of state-owned forest farms in Xiuning County is obviously the highest,followed by Xishan State-owned Forest Farm,Jinsishan State-owned Forest Farm,and finally Da Gongshan State-owned Forest Farm.The main reasons for the lower level of natural forests in state-owned forest farms in Anhui Province are: The forest stands originated from artificial afforestation,and few natural regeneration forests;And the single basic composition of tree species is pure artificial forest,and the proportion of mixed forests is too small.(5)According to the results of forest natural degree evaluation,combining the current state of forest resources in state-owned forest farms in different regions of Anhui province,a relative business strategy is proposed for different levels of naturalness,and the objectives of the near-natural forest management of state-owned forest farms in different regions are proposed and targeted.The management plan and technical measures are given to provide theoretical guidance for the long-term development of forests in state-owned forest farms.Forests with better natural forest values need to be consolidated to protect their operations.For forests with low natural values,it is necessary to strengthen tending management and reduce rotation.