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Dynamics of Landscape Pattern in Huanglong Mountain Forest Region of Northern Shaanxi Province

陕北黄龙山林区景观格局动态


Based on the forest inventory data of Huanglong Mountain in 1986, 1997 and 2006, we analyzed the changes of landscape types and landscape structure. The landscape was changed greatly during the 20 years. The area of forested land continuously was increased, while the shrub land and wasteland were gradually decreased. The area of the cultivated land and immature forest land increased from 1986 to 1997, while decreased from 1997 to 2006. Changes in Cupressus forest land and nursery land, which accounted for only a small part of the entire landscape, were not significant. At the landscape level, the area of hard broad-leaved forests and coniferous forests was increased by 40% from 1986 to 2006. The area of Cupressus forest land remained unchanged at approximate 2 000 hm2 during the two periods, while the area of soft broad-leaved forest land continuously decreased. Moreover, the age-class structure of the major species significantly varied. The hard broad-leaved forests and coniferous forests merged with a block which had the largest patch index and was much greater than that of the other landscape types in each period. The landscape diversity decreased, while the landscape heterogeneity, fragmentation and dominance increased. The patch types tended to distribute in reunion state.


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