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[1]GAO Yanjing,XIE Yuchu,QIAN Dawen,et al.Dynamic Variations of Vegetation Coverage and Landscape Pattern in Bailongjiang Basin of Southern Gansu[J].Research of Soil and Water Conservation,2015,22(01):181-187.

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Dynamic Variations of Vegetation Coverage and Landscape Pattern in Bailongjiang Basin of Southern Gansu

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 22 Number of periods: 2015 01 Page number: 181-187 Column: Public date: 2015-02-28

Title:: Dynamic Variations of Vegetation Coverage and Landscape Pattern in Bailongjiang Basin of Southern Gansu

Author(s):: GAO Yanjing, XIE Yuchu, QIAN Dawen, ZHANG Lingling, GONG Jie; Key Laboratory of Western China’s Environmental Systems, MOE, Research School of Arid Environment and Climate Change, Lanzhou University, Lanzhou 730000, China

Keywords:: Bailongjiang Basin; NDVI; vegetation coverage; spatiotemporal variation; landscape pattern

CLC:: X171.4

DOI:: -

Abstract:: Based on the SPOT NDVI during the period 1998—2012, this paper analyzes the fractional vegetation coverage temporal-spatial variation and landscape pattern in Bailongjiang Basin of southern Gansu by using the methods of dimidiate pixel model and landscape pattern analysis. Results are shown as the following: (1) from 1998 to 2012, fractional vegetation coverage of the study area increased, the area of high vegetation coverage increased apparently (about 737.30 km²), the ratio of high vegetation coverage to intermediate vegetation coverage was 70.7%, and the increased region mainly distributed in the northern Tanchang, the eastern riverside of Minjiang River, both sides of Bailongjiang River from Zhouqu to Wudu and north of it; (2) though the vegetation coverage presented an overall increase, it locally degraded in some areas, during that period, the areas and ratio of obviously increased region to slightly increased region were 4 675.90 km², 25%, respectively, and the ratio of obviously decreased region only accounted for 3.84%; (3) from 1998 to 2012, the landscape fragmentation increased, with patch density increased by 58.23%; landscape shape was prone to be more complicated; LSI, AWMPFD, and IJI increased to 25.14, 1.128, and 80.01, respectively. In addition, SHDI and SHEI reduced to 1.342 and 0.834, respectively. (4) the improvement of the fractional vegetation coverage in Bailongjiang Basin was the interactive effect of natural factors and human activities, but the main cause was the implementation of the series of ecological projects, such as ‘Grain for Green Project’ and ‘Natural Forest Protection’.

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