景观格局视角下晋西三川河流域径流变化归因分析
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国家自然科学基金重点项目(51838003)


Attribution analysis of runoff changes in the Sanchuan River Basin of Shanxi Province from the perspective of landscape patterns
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    摘要:

    黄土高原大规模人类活动造成下垫面剧烈变化,流域景观格局改变,影响产汇流过程。学科融合视角下,基于Budyko水热耦合方程、景观指数计算以及回归分析等多学科方法,以晋西黄土丘陵沟壑区三川河流域为例,分析不同尺度景观格局变化造成流域径流量变化的原因,判别地理景观空间对产汇流过程的影响。结果表明:(1)1980年至今是研究区径流锐减阶段,其中下垫面变化对径流贡献率为60.81%;(2)1980年至今的下垫面变化造成流域景观斑块破碎、形状趋于规整,景观格局分割度、蔓延度提高;(3)利用逐步线性回归模型可将径流减少的景观格局变化定位到具体地理空间,流域东部、北部主要支流上游与两条支流汇流处的林地核心斑块面积减少以及城市建设区域对于水体连通性的破坏。通过跨学科方法探究景观格局与径流变化之间的潜在空间关联,揭示径流对景观格局变化的响应,可为黄土高原水资源管理与生态规划提供决策依据。

    Abstract:

    Large-scale human activities on the Loess Plateau have caused dramatic changes in the substratum and altered the landscape pattern of the watershed, even affected the runoff production and sink processes. Based on the Budyko hydrothermal coupling equation, landscape index calculation, and regression analysis methods, this paper takes the Sanchuan River Basin in western Shanxi Province, located in the loess hilly gully area, as an example, to analyze the causes of runoff changes in the basin caused by changes in landscape patterns at different scales and to discern the influence of geographic landscape space on the production and sink processes. The results show that:(1) the runoff in the study area has decreased sharply from 1980 to the present, in which the contribution of subsurface changes to runoff was 60.81%. (2) The substrate changes from 1980 to the present caused the fragmentation and regularization of the landscape patches in the watershed, and the fragmentation and spreading of the landscape pattern increased. (3) Using a stepwise linear regression model, the landscape pattern changes in runoff reduction could be localized to specifically geographic spaces. The reduction of the core areas of woodland patches in the upper reaches of the eastern and northern tributaries and their confluence, and the disruption of the connectivity of water patches by the urban built-up areas at the confluence of the tributaries, are the direct spatial causes of the runoff reduction in watershed. An interdisciplinary approach is used to explore the potentially spatial correlation between landscape patterns and runoff changes, and to reveal the response of runoff to landscape pattern changes, which can provide a decision basis for water resources management and ecological planning on the Loess Plateau.

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雷泽鑫,傅健宇,罗俊杰,曹磊.景观格局视角下晋西三川河流域径流变化归因分析.生态学报,2022,42(12):4946~4958

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