Understanding the roles of climate change, land use and land cover change and water diversion project in modulating water- and carbon-use efficiency in Han River Basin

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dc.contributor.authorLiu, Dedi
dc.contributor.authorYue, Feng
dc.contributor.authorXiong, Lihua
dc.date.accessioned2025-07-24T07:52:34Z
dc.date.available2025-07-24T07:52:34Z
dc.date.issued2024
dc.description.abstractWater-use efficiency (WUE) and carbon-use efficiency (CUE) are critical indicators of ecosystem function and hydrologic processes, reflecting the water-carbon flux exchange rate. Climatic variables, land use and land cover change (LUCC) and water diversion project (WDP) have altered water-carbon cycle; however, their roles in modulating WUE and CUE remain uncertain. To explore these effects, a framework is proposed and Han River basin (HRB) in China is selected as a case study including the data sets from both remote sensing and in situ observations during 2000–2020. The process-based Regional Hydro-Ecological Simulation System model and a supervised machine learning model are applied to simulate the impacts of climatic variables, LUCC and WDP on WUE and CUE, which are conducted by designing four experiments. We find that no significant WUE and CUE trends attributed to contrasting trends in the dry (October to March) and wet (April to September) seasons. Temperature variations greatly affect WUE and CUE, with WUE decreasing in the wet season and increasing in the dry season due to minimum temperature changes. LUCC has litter impacts on WUE and CUE changes. From 2014 to 2020, the middle route of the South-to-North WDP decreased WUE by 0.22 gCkg−1H2O in the middle-low HRB's wet season, slightly affecting CUE. Seasonal CUE was stable, with the largest decrease of 0.04 in the upper HRB during the wet season. The WDP also increased WUE sensitivities to minimum and maximum temperatures, while CUE sensitivities remained constant. Our case study has proven that the proposed framework is an effective way to understand the roles of climate change and WDP in modulating WUE and CUE.
dc.identifier.citationYue, F., Liu, D., Xiong, L., Chen, J., Chen, H. and Yin, J., 2025. Understanding the roles of climate change, land use and land cover change and water diversion project in modulating water-and carbon-use efficiency in Han River Basin. Journal of Environmental Management, 373, p.123445.
dc.identifier.urihttps://doi.org/10.1016/j.jenvman.2024.123445
dc.identifier.urihttps://hdl.handle.net/10566/20583
dc.language.isoen
dc.publisherElsevier Ltd
dc.subjectCarbon use efficiency
dc.subjectEvapotranspiration
dc.subjectRandom forest
dc.subjectRHESSys
dc.subjectWater diversion project
dc.titleUnderstanding the roles of climate change, land use and land cover change and water diversion project in modulating water- and carbon-use efficiency in Han River Basin
dc.typeArticle

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