不同时空尺度下流域景观格局与水质的相关性研究——以嫩江右岸典型子流域为例
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国家自然科学基金项目“基于河流健康响应的流域景观要素变化阈值研究”(50509002);科技部“国家水体污染控制与治理科技重大专项”(2008ZX07526-001)


Correlation Between Landscape Pattern and River Water Quality at Various Temporal and Spatial Scales
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    摘要:

    流域景观格局与水质的相关关系依赖于研究的时空尺度,区分时空尺度的研究有助于为流域水陆一体化管理提供准确依据。以嫩江右岸典型子流域为例,从亚流域、河流廊道2个空间尺度,丰水和枯水期2个时间尺度,研究了景观格局与河流水质的相关关系,分析了相关关系的时空差异。空间尺度上的研究结果表明:(1)亚流域尺度上与水质指标相关性显著的景观指标个数较河流廊道尺度多;(2)随尺度增大,NO3—N,综合污染指数与林地景观百分比的负相关性先增后减,400m处负相关性最强;TDS,NH4—N,NO3—N,综合污染指数与耕地景观百分比的正相关性先增后减,300m处正相关性最强,300~400m是嫩江支流廊道管理的关键区域。时间尺度上的研究结果表明,丰水期与水质指标显著相关的景观指数个数较枯水期多;丰水期林地、草地和耕地景观与水质指标的相关性强,而枯水期建设用地景观与水质指标的相关性强。

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    The correlation between watershed landscape pattern and water quality depends upon the temporal and spatial scales.The study addressing different spatio-temporal scales could provide a clear basis for integrated management of land and water.Typical sub-watersheds of Nenjiang river were chosen as study sites, and the correlation between landscape pattern and river water quality was studied at the scales of sub-basin and riparian,wet and dry season,then the temporal and spatial difference in correlation was analyzed.The results of spatial scale analysis indicate that,more landscape indices correlated significantly with water quality indices at the sub-basin scale than at the riparian scale.Along with increase of spatial scale,the negative relationship of NO3—N and integrated pollution index with the forest percentage declined after initial increasing, and this negative relationship reached its strongest at the 400mbuffer.While the positive correlation of TDS,NH4—N,NO3—N,integrated pollution index with the farmland percentage also decreased after initial increasing along with increase of spatial scale,and the strongest relationship was found at 300mbuffer. Therefore,300~400m might be the critical area for river corridor management of Nenjiang river.As for temporal scale analysis,more landscape indices correlated closely with water quality indices in wet season than in dry season.In wet periods,forest,grassland and farmland landscapes were more relevant to water quality,while the construction landscape was more relevant to water quality in dry season

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于磊,赵彦伟,汪思慧,田竹君.不同时空尺度下流域景观格局与水质的相关性研究——以嫩江右岸典型子流域为例[J].水土保持通报,2011,(5):254-258

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  • 收稿日期:2011-01-27
  • 最后修改日期:2011-01-30
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  • 在线发布日期: 2014-11-26
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