| In this paper,based on the secondary supplementary survey data and fixed sample land survey data of Xinjiang forestry resources,the health status of Tianshan spruce forest in Nanshan forest farm was evaluated from three aspects: forest structure,ecological service function,anti-interference(diseases and insect pests,forest fire risk)by using random forest and entropy weight method.And through Guidos Toolbox software respectively to get forest farm of Nanshan arbor,shrub and arbor + shrub of MSPA landscape in the future,and with the aid of Conefor Sensinode 2.6 software for research in core patch connectivity index,using the entropy weight method,the comprehensive score of the connectivity of MSPA core plaques and landscape pattern has carried out analysis,and on the characteristics of the landscape of forest health further analysis.The results show that:(1)The health status of the spruce forest in the study area was mainly good health and sub-health.If not protected and properly managed,the forest condition of nanshan forest farm is likely to develop to an unhealthy state.Area of forest health levels of different proportion: the health(30.32%)> good health(27.08%)>(19.49%)(16.45%)> >high quality health is not healthy(6.65%).The sub-healthy and unhealthy small classes are mainly distributed in the northwest,and the fragmentation is more serious.Most of them are small plaques,accounting for about 1/4 of the total area of small classes.Small classes with high quality and good health were distributed in the southeast of China,with strong resistance to disease and insect pests and a larger average patch area,but a higher forest fire risk level.If properly managed,the forest health of the research area still has great room for improvement.(2)In the MSPA landscape of arbor forest,the plaque type with the largest number of plaques is small plaques,accounting for 90.32% of the total number of plaques,but the area only accounts for about 10%.The MSPA landscape with arbor forest as the foreground has obvious spatial heterogeneity,and the distribution of large and small patches is extremely uneven.The landscape pattern is composed of a small number of large patches and a large number of small patches.Although the MSPA patches in shrubbery are small in area,mostly small in size and with serious fragmentation,90% of the shrubbery core areas,branches and connecting Bridges effectively promote the connection and integration of trees and shrubbery patches in the overall landscape.The connection bridge and the branch patch connecting the arbor forest and the shrub forest landscape enrich the connection of the core area and improve the structural stability of the overall landscape patch.(3)In the overall MSPA landscape of tree forest + shrub forest: tree forest is the main part in the core area of the landscape;The core patch of arbor forest plays a decisive role in maintaining the stability of the whole landscape.The patch types that have important connectivity and influence the overall landscape connectivity level are large patches,which are the key components of the stability and health of the regional ecosystem.(4)The spatial characteristics of small classes with different health levels are closely related to MSPA landscape pattern and connectivity;In general,the patches in the core area have higher structural stability,strong ability to resist external interference and good forest health.However,they also have higher risk of forest fire risk. |
