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首页> 外文期刊>Journal of arid environments >Changes In Vegetation And Landscape Patterns With Altered River Water-flow In Arid West China
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Changes In Vegetation And Landscape Patterns With Altered River Water-flow In Arid West China

机译:西部干旱地区河流水流变化对植被和景观格局的影响

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摘要

Landsat TM images of Tarim Basin in western China for 1986, 1999 and 2004 were analyzed for quantifying the patterns of landscape change relating to changes in water supply. Results showed that vegetation area and NDVI mostly decreased from 1986 to 1999, and increased from 1999 to 2004, while changes in desert area displayed an inverse pattern. Saline alkali soil showed a tendency of increase from 1999 to 2004. Spatially, percentage of vegetation area decreased and percentage of desert area increased with distance from the river in the upper section, while such patterns were not observed for both the middle and the lower sections. Landscape displayed a pattern of fragmentation from 1986 to 1999 and integration from 1999 to 2004. Shape of vegetation patches tended to become more regular from 1986 to 1999 and more irregular from 1999 to 2004. Our results indicated hydrological control of spatio-temporal variations of vegetation and landscape pattern in arid regions. Water diversion can be effective for raising the local groundwater level and improving plant growth, but its effect is largely restricted to areas adjacent to the water pathway.
机译:分析了中国西部塔里木盆地1986年,1999年和2004年的Landsat TM影像,以量化与供水变化有关的景观变化格局。结果表明,植被面积和NDVI从1986年到1999年大部分减少,而从1999年到2004年增加,而沙漠面积的变化则呈现相反的趋势。盐碱土从1999年到2004年呈增加趋势。在空间上,植被的百分比减少,沙漠面积的百分比随着距河的距离的增加而增加,而在中部和下部都没有观察到这种模式。 。景观在1986年至1999年间呈现碎片化的格局,并在1999年至2004年间融合。植被斑块的形状在1986年至1999年间趋于规则化,在1999年至2004年间趋于不规则。我们的结果表明,植被的时空变化受到水文控制。和干旱地区的景观格局。引水可有效提高当地地下水位并改善植物生长,但其影响在很大程度上限于与水路相邻的区域。

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