Impacts of vegetation restoration on water resources and carbon sequestration in the mountainous area of Haihe River basin, China

环境科学 蒸散量 植被(病理学) 水文学(农业) 地表径流 固碳 植树造林 水资源 农林复合经营 生态学 地质学 二氧化碳 医学 生物 病理 岩土工程
作者
T. Ma,Taihua Wang,Dawen Yang,Shuyu Yang
出处
期刊:Science of The Total Environment [Elsevier BV]
卷期号:869: 161724-161724 被引量:27
标识
DOI:10.1016/j.scitotenv.2023.161724
摘要

The mountainous region of the Haihe River basin (MHRB) plays an important role in the water resource supply of its nearby mega-cities, including Beijing and Tianjin, and large areas of cropland. With the implementation of afforestation projects in recent decades, vegetation and carbon (C) uptake have greatly increased in the MHRB. In addition, the annual runoff has significantly declined, threatening regional water security. The trade-off relationship between water yield and C uptake in the MHRB remains unknown. This study employed a biogeochemical model (Biome-BGC) to simulate the natural vegetation dynamics and gross primary productivity (GPP) during 1982–2019 driven by climate forcing. A distributed hydrological model (geomorphology-based hydrological model, GBHM) was adopted to assess the impact of vegetation restoration on the hydrological processes. The results indicated that the leaf area index in the MHRB increased significantly (P < 0.01) during 1982–2019, which led to evapotranspiration increase and runoff (R) reduction. Under the influence of vegetation restoration, both the GPP and the water use efficiency (WUE) increased significantly in the MHRB during 2000–2019, however, the improvement of WUE decreased with the aridity index increasing. Our results showed that vegetation restoration can improve C sequestration efficiency in the MHRB and that the trade-off between water yield and C sequestration should be considered in planning ecological projects to achieve C neutrality.
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