Terrestrial GPP Responses to Varying Intensities of Compound Heatwave--Drought Extremes in the Han River Basin

Terrestrial GPP Responses to Varying Intensities of Compound Heatwave--Drought Extremes in the Han River Basin | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 13 March 2026 V1 Latest version Share on Terrestrial GPP Responses to Varying Intensities of Compound Heatwave--Drought Extremes in the Han River Basin Authors : hongxiang wang , junjie huang 0009-0007-2045-7509 [email protected] , fei ding , and wenxian guo Authors Info & Affiliations https://doi.org/10.22541/au.177336399.91889956/v1 142 views 116 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract Abstract: Compound Heatwave–Drought Events (CHDEs), driven by global warming, impose coupled thermal and hydrological stress on terrestrial ecosystems, affecting carbon cycle processes through vegetation structural and photosynthetic changes. This study examines vegetation productivity responses to varying CHDE intensities in the Hanjiang River Basin using ERA5-Land data (2000–2022) and MODIS-derived Gross Primary Productivity (GPP) and Enhanced Vegetation Index (EVI). CHDEs are identified using a combined Standardized Precipitation Evapotranspiration Index–Heatwave Index (SPEI–HI) framework, and GPP and EVI anomalies for representative years (2007, 2010, and 2018) are analyzed. Climatic drivers of GPP variability are assessed with Structural Equation Modeling (SEM) and Random Forest–SHAP (RF–SHAP) to capture both linear and nonlinear effects. Results show that although summer GPP generally increases, significant declines occur in CHDE years, with lowland plains highly sensitive to CHDE intensity. The strong coherence between EVI and GPP highlights the role of vegetation structure in regulating carbon uptake. SEM results indicate air temperature suppresses GPP, while soil moisture and SPEI have positive effects. RF–SHAP reveals a threshold: GPP and EVI sharply decline when CHDE intensity exceeds 1.0, indicating reduced canopy structure and photosynthetic efficiency. These findings provide mechanistic insight into carbon cycle responses to compound climate extremes. Supplementary Material File (manuscript1.docx) Download 15.51 MB Information & Authors Information Version history V1 Version 1 13 March 2026 Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords 10: forest 27: trees 8: vegetation sciences apar–lue framework compound heatwave–drought events enhanced vegetation index gross primary productivity nonlinear responses Authors Affiliations hongxiang wang North-China University of Water Conservancy and Electric Power View all articles by this author junjie huang 0009-0007-2045-7509 [email protected] North-China University of Water Conservancy and Electric Power View all articles by this author fei ding North-China University of Water Conservancy and Electric Power View all articles by this author wenxian guo North-China University of Water Conservancy and Electric Power View all articles by this author Metrics & Citations Metrics Article Usage 142 views 116 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation hongxiang wang, junjie huang, fei ding, et al. Terrestrial GPP Responses to Varying Intensities of Compound Heatwave--Drought Extremes in the Han River Basin. Authorea . 13 March 2026. DOI: https://doi.org/10.22541/au.177336399.91889956/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu . Format Please select one from the list RIS (ProCite, Reference Manager) EndNote BibTex Medlars RefWorks Direct import Tips for downloading citations document.getElementById('citMgrHelpLink').addEventListener('click', function() { popupHelp(this.href); return false; }); $(".js__slcInclude").on("change", function(e){ if ($(this).val() == 'refworks') $('#direct').prop("checked", false); $('#direct').prop("disabled", ($(this).val() == 'refworks')); }); View Options View options PDF View PDF Figures Tables Media Share Share Share article link Copy Link Copied! Copying failed. 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