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首页> 美国卫生研究院文献>International Journal of Environmental Research and Public Health >The Implication of Land-Use/Land-Cover Change for the Declining Soil Erosion Risk in the Three Gorges Reservoir Region China
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The Implication of Land-Use/Land-Cover Change for the Declining Soil Erosion Risk in the Three Gorges Reservoir Region China

机译：三峡库区土地利用/覆被变化对土壤侵蚀风险下降的影响

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The Three Gorges Reservoir Region (TGRR) in China is an ecologically and politically important region experiencing rapid land use/cover changes and prone to many environment hazards related to soil erosion. In the present study, we: (1) estimated recent changes in the risk pattern of soil erosion in the TGRR, (2) analysed how the changes in soil erosion risks could be associated with land use and land cover change, and (3) examined whether the interactions between urbanisation and natural resource management practices may exert impacts on the risks. Our results indicated a declining trend of soil erosion risk from 14.7 × 106 t in 2000 to 1.10 × 106 t in 2015, with the most risky areas being in the central and north TGRR. Increase in the water surface of the Yangtze River (by 61.8%, as a consequence of water level rise following the construction of the Three Gorges Dam), was found to be negatively associated with soil erosion risk. Afforestation (with measured increase in forest extent by 690 km2 and improvement of NDVI by 8.2%) in the TGRR was associated with positive soil erosion risk mitigation. An interaction between urbanisation (urban extant increased by 300 km2) and vegetation diversification (decreased by 0.01) was identified, through which the effect of vegetation diversification on soil erosion risk was negative in areas having lower urbanisation rates only. Our results highlight the importance of prioritising cross-sectoral policies on soil conservation to balance the trade-offs between urbanisation and natural resource management.
机译：中国的三峡库区（TGRR）是一个生态和政治上重要的地区，经历着快速的土地利用/覆盖变化，并容易遭受与土壤侵蚀有关的许多环境危害。在本研究中，我们：（1）估算了TGRR中土壤侵蚀风险模式的最新变化，（2）分析了土壤侵蚀风险的变化如何与土地利用和土地覆被变化相关，以及（3）研究了城市化与自然资源管理实践之间的相互作用是否会对风险产生影响。我们的结果表明，土壤侵蚀风险的趋势从2000年的14.7×10 6 t下降到2015年的1.10×10 6 t，风险最高的区域位于中部和北部TGRR。长江水面的增加（由于三峡大坝建设后水位上升造成的61.8％的增加）被发现与水土流失风险负相关。 TGRR的造林（测得的森林面积增加了690 km 2 和NDVI改善了8.2％）与减轻土壤侵蚀风险有关。确定了城市化（现存城市增加了300 km 2 ）与植被多样化（降低了0.01）之间的相互作用，通过这种相互作用，在城市化率较低的地区，植被多样化对土壤侵蚀风险的影响为负只要。我们的研究结果强调了优先考虑水土保持的跨部门政策，以平衡城市化与自然资源管理之间的权衡的重要性。

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