Land-use changes reinforce the impacts of climate change on annual runoff dynamics in a southeast China coastal watershed
Land-use changes reinforce the impacts of climate change on annual runoff dynamics in a southeast China coastal watershed
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DOI：
10.5194/hessd-12-6305-2015
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发表时间：
2015-06
期刊：
影响因子：
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通讯作者：
Ayu Ervinia;Jinliang Huang;Z. Zhang
中科院分区：
文献类型：
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作者：
Ayu Ervinia;Jinliang Huang;Z. Zhang
摘要。研究不同地理区域的径流动态对于制定合理的水资源管理战略具有重要意义，特别是在人口高度集中和依赖水资源的沿海流域。L - R图是一个概念模型，利用中国典型的亚热带中型沿海流域九龙江流域53年的水文气候数据，估算土地变化蒸散量（ΔL）作为实际蒸散量与气候蒸散量的差值，以确定土地利用变化对年径流变化的具体影响（ΔR）。研究发现，土地利用变化强化了气候变化对径流变化的影响，几乎所有点都分散在II和IV象限。森林砍伐和建筑面积的扩大降低了集水区的保水能力和蒸散作用，从而产生了额外的径流，占总径流增加的12 - 183%。相比之下，重新造林对减少年径流的贡献很大，约占总径流损失的21 - 82%。研究表明，在气候变化的背景下，沿海流域的河流径流更容易受到强烈的人为干扰。
Abstract. Study on runoff dynamics across different physiographic regions is fundamentally important to formulate the sound strategies for water resource management especially in the coastal watershed where peoples heavily concentrated and relied on water resources. The L−R diagram, a conceptual model by which the land-changes evapotranspiration (ΔL) was estimated as the difference between actual and climate evapotranspiration to identify the specific impact of land-use changes on annual runoff changes (ΔR), was developed using the 53-year hydro-climatic data of Jiulong River Watershed, a typical medium-sized subtropical coastal watershed in China. This study found that land-use changes have reinforced the impact of climatic changes on runoff changes where nearly all points were scattered in II and IV quadrant. Deforestation and expansion of built up area has diminished the water retention capacity in a catchment as well as evapotranspiration thus produce extra runoff accounting for 12–183 % of total runoff increase. In contrast, reforestation makes the significant contribution to decreasing annual runoff for about 21–82 % of total runoff loss. This study revealed the river runoff has become more vulnerable to intensive anthropogenic disturbances under the context of climate changes in a coastal watershed.