[1]DUAN Limin,LI Wei,LUO Yanyun,et al.Spatiotemporal Variations of Vegetation Leaf Area Index and Its Response to Topographical Factors in Xilin River Basin[J].Research of Soil and Water Conservation,2019,26(03):224-231.
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Spatiotemporal Variations of Vegetation Leaf Area Index and Its Response to Topographical Factors in Xilin River Basin
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
26
Number of periods:
2019 03
Page number:
224-231
Column:
Public date:
2019-04-12
- Title:
- Spatiotemporal Variations of Vegetation Leaf Area Index and Its Response to Topographical Factors in Xilin River Basin
- CLC:
- Q948
- DOI:
- -
- Abstract:
- Xilin River Basin is a main component of Eurasia steppe land, whereas the vegetation heterogeneity is noticeable affected by external environment and human activities. Vegetation leaf area index (LAI) is the key parameter which decides the exchanges of substance and energy between steppe ecosystem and atmosphere, and can directly describe the growth status of vegetation. Remote sensing and statistical model based on atmospherically resistant vegetation index (ARVI) were applied to retrieve the LAI of 4 typical years of 1985-2015. The spatiotemporal variations of LAI and its spatial distribution affected by topographical factors were analyzed. The results indicated that:(1) in recent 30 years, the LAI showed the increasing trend with average annual mean value of 0.8 to 1.5, and decreased from upstream to downstream; (2) the spatial heterogeneity of vegetation restoration was obvious, the main development trend was restoration; (3) the area percentages of LAI ranging from 0.78 to 0.82 and from 0.82 to 0.86 decreased with the increasing of altitude and slope, and the proportion of the area in the southeast was greater than the other directions; LAIs ranging from 0.92 to 1.5 and from 1.5 to 3.0 increased with the increasing of altitude and slope, and the proportion of the area in the west and southwest was greater than the other directions. The direct effect of elevation on LAI was 0.438, which is far greater than that of slope and aspect. This study provides theoretical and scientific basis for land surface processes and eco-hydrological researches, and also can be used for the healthy maintenance of natural ecosystem as well as the restoration of degraded ecosystem.
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1900-01-01