| Forest ecosystem is an important part of terrestrial ecosystem and the "lung of the earth".Under the combined action of its complex structure,forest ecosystem plays multiple functions such as water conservation,soil and water conservation,carbon fixation,oxygen release,air purification and biodiversity protection,maintaining the normal operation of the earth's life system.In order to better protect the existing intact forest communities,China has designated several forest nature reserves.However,how to protect this type of nature reserve and how to better protect the creatures to be protected in the nature reserve should also be studied and analyzed from multiple perspectives,so as to p.rovide more sufficient and reasonable basis for the establishment of functional area division,future protection,development and construction measures.This paper takes the forest type nature reserve with forest community as the research object,evaluates the forest ecological function of dongxiong guanyindong nature reserve at guangdong province.The results are as follows:(1)In the<technical provisions for continuous inventory of national forest resources(2014)>,on the basis of analysis and screening of the Slope,slope position,slope direction,altitude,soil type,soil layer thickness,litter thickness,age group,canopy density,total coverage,plant number per hectare,average DBH,average forest height,hectare stock volume,tree species structure,forest community structure,health degree,naturalness degree,hectare biomass,the 19 hectares forest structure and the site conditions of the factors as evaluation index.In addition,the corresponding vectors and weights of each index are calculated through the projection tracking classification based on MATLab as the platform and swarm intelligent optimization algorithm as the optimal algorithm,and the grade of evaluation results is refined to construct a new forest ecological function evaluation system.(2)The forest ecological function evaluation on guanyin dong nature reserve is conducted.The results show that:(1)the total area evaluated as "poor" reaches 113.25hm2,accounting for 4.03%of the overall area.The total area evaluated as"poor" reached 640.46hm2,accounting for 22.78%of the total area.The total area evaluated as "medium" reaches 813.63hm2,accounting for 28.94%of the total area.The total area evaluated as "better" reaches 1075.94hm2,accounting for 38.28%of the total area.The total area evaluated as "excellent" reaches 167.76hm2,accounting for 5.97%of the total area.The overall forest ecological function score of guanyindongbao nature reserve is 1,759,and the evaluation level is "medium".The overall forest ecological function of guanyindong nature reserve is basically good.(2)Stands with good evaluation results are characterized by pure natural broadleaf forest and coniferous mixed forest with better site conditions,older trees and relatively complete structure(coniferous mixed forest with total accumulation of coniferous species ?65%).Stands with poor evaluation results are characterized by high altitude,small age and simple structure of planted coniferous pure forest or bamboo forest.(3)the impact of woodland on forest ecological function is different,and the corresponding impact range is also different:the comprehensive impact range of water system and road is 100m to 300m,and the impact range of cultivated land and construction land is around 500m.(3)According to the evaluation results,put forward the functional zoning recommendations and corresponding protection countermeasures. |
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