降水和植被变化对径流影响的尺度效应——以陕北黄土丘陵沟壑区为例

doi:10.18306/dlkxjz.2015.08.011

Abstract

Abstract:

Water conservation capability of the loess plateau increased significantly since the Grain for Green project started. At the same time, the amount of runoff significantly reduced, resulting in the question of how to balance the water conservation needs and the need for water supply in the region. In order to explore causes of the runoff reduction and provide support for balancing different needs for water at different scales, the variation of precipitation and vegetation as well as the scale effect of its impact on runoff in northern Shaanxi loess hilly-gully region during 2006 to 2011 were examined. The results show that: Precipitation of flood season gradually reduced from southeast to northwest in the study area. During the research period, vegetation restored significantly, nearly 80% of vegetated area was improved, especially in areas with poor vegetation conditions. Precipitation and runoff had significant positive correlation. With the increase of sub-watershed area,the correlation of precipitation and runoff increased, which shows a clear scale effect. The main reason was that land use structure above 15° of slope changed along with the spatial scale—vegetation types at steep slope tended to be homogenous and forest that has significant water conservation function decreased along with the increase in sub-watershed area. The correlation between NDVI and runoff was neither significant nor forming a clear relationship with the area of sub-watersheds, therefore the scale effect of vegetation influence on runoff was not obvious.

Key words: NDVI, precipitation, runoff, scale effect, tradeoff, loess hilly-gully region

DING Jingyi, ZHAO Wenwu, WANG Jun, FANG Xuening. Scale effect of the impact on runoff of variations in precipitation/vegetation： taking northern Shaanxi loess hilly-gully region as an example[J].PROGRESS IN GEOGRAPHY, 2015, 34(8): 1039-1051.

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程度	NDVI变化趋势	程度	NDVI变化趋势
严重退化	Slope≤-0.0150	轻微改善	0.0009<Slope≤0.0075
中度退化	-0.0150<Slope≤-0.0075	中度改善	0.0075<Slope≤0.0150
轻微退化	-0.0075<Slope≤-0.0009	明显改善	Slope>0.0150
基本不变	-0.0009<Slope≤0.0009

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Scale effect of the impact on runoff of variations in precipitation/vegetation： taking northern Shaanxi loess hilly-gully region as an example

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