黄河源区气候—植被—水文协同演变及成因辨析

doi:10.11821/dlxb202207011

Abstract

Abstract:

Vegetation recovery under global change and its consequent evolution of eco-hydrological processes have modulated the water resources conservative capacity in the source region of the Yellow River (YRSR). Based on climatological data, remotely sensed vegetation index and geographical information, the integrated simulations of water and carbon cycles in the YRSR are presented, with the vegetation interface processes (VIP) distributed eco-hydrological dynamic model. Then the co-evolving mechanisms of hydrological and vegetation dynamics are investigated. Results show that warming and wetting climate in the YRSR has improved the vegetation growing condition and extended the growing period for more than 10 days in recent decades. Averaged NDVI from 2010 to 2020 increased by 4.5% relative to that from 2000 to 2009. Vegetation gross primary productivity (GPP) shows a significant uptrend with a rate of 4.57 gC m^-2 a^-1, 77% of which is contributed by climate change and elevated atmosphere CO₂ fertilization, and the rest 23% is by vegetation greening. Evapotranspiration (ET) is increasing at a rate of 2.54 mm a^-1and vegetation water use efficiency (WUE, expressed as GPP/ET) is also improving at a relative rate of 5.1% a^-1. Generally, annual ET, GPP and WUE and their trends are decreasing along the elevation below 4200 m. At basin scale, there are significant positive correlations between the vegetation greenness and the runoff coefficient with precipitation in the current and previous years, demonstrating a legacy effect of precipitation for vegetation recovery on water conservation capacity. The increased ET might be a benefit to the water recycle between land surface and atmosphere, which will alleviate the reduced potential of water yield owing to ecological restoration and establish trades-off and synergies among precipitation, vegetation and water yield. Conclusively, exploring the mechanisms of hydrological responses to climate change and vegetation recovery and its feedback will provide scientific support to the assessment of ecological engineering programs in the source regions.

Key words: ecohydrology, evapotranspiration, vegetation productivity, VIP model, climate change

MO Xingguo, LIU Suxia, HU Shi. Co-evolution of climate-vegetation-hydrology and its mechanisms in the source region of Yellow River[J].Acta Geographica Sinica, 2022, 77(7): 1730-1744.

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Co-evolution of climate-vegetation-hydrology and its mechanisms in the source region of Yellow River

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