数字农科院2.0

Climate-shaped vegetation dominated the spatial pattern of the Bowen ratio over terrestrial ecosystems in China

文献类型： 外文期刊

作者： Sun M.;Yu G.;Chen Z.;Hao T.;Yang M.;Zhu X.;Zhang W.;Han L.;Liu Z.;Ma L.;Dou X.;Yao Y.;Wang J.;Luo W.;Lin Y.;Chen S.;Deng Z.;Dong G.;Du H.;Gao Y.;Gu F.;Hao X.;Hao Y.;He Q.;He Y.;He J.;Ji X.;Jiang S.;Jiang Z.;Li X.;Li Y.;Li Y.;Li Y.;Liu R.;Liu S.;Luo W.;Mo X.;Sha L.;Shi P.;Song Q.;Sun D.;Tan J.;Tang Y.;Wang F.;Wang H.;Wang J.;Wei W.;Wu J.;Wu Z.;Xin X.;Yan J.;Zhang F.;Zhang Y.;Zhang Y.;Zhang Y.;Zhao F.;Zhao L.;Zhou L.;Zhu J.;Zhu Z.

作者机构：

关键词： Bowen ratio;Eddy covariance;Energy partitioning;Heat flux;Sensible heat;Spatial patterns

期刊名称： Agricultural and Forest Meteorology

ISSN： 0168-1923

年卷期： 2024 年 344 卷

页码：

收录情况： SCIE（2024版）

摘要： The Bowen ratio (β), which is the ratio of sensible heat (H) to latent heat (LE), reflects the energy balance and partitioning processes among soil, vegetation, and the atmosphere. Although the spatial patterns of β have been clearly delineated, the importance of vegetation in the spatial variation of β is frequently underestimated. Revealing the spatial patterns of β would improve the understanding of the variation in energy partitioning in terrestrial ecosystems and its reciprocal relationship with environmental change. Here, we calculated β by integrating H and LE flux values from 80 flux observation sites based on the eddy-covariance method in ChinaFLUX to analyze the spatial pattern and mechanism of β in China. Terrestrial ecosystems in China had an average β of 0.64 ± 0.47. β varied significantly among ecosystem types. Deserts had the highest β (2.08 ± 0.17), while wetlands had the lowest β (0.37 ± 0.11). The β values of terrestrial ecosystems exhibited a significant latitudinal pattern, increasing linearly with latitude. This pattern also existed in forest and cropland ecosystems. The spatial pattern of β was dominated by climate-shaped vegetation factors, including leaf area index (LAI) and fractional vegetation cover (FVC). Nevertheless, as water and thermal conditions decline, the contribution of vegetation factors gradually wanes. These findings demonstrated the spatial variations and driving mechanisms of terrestrial ecosystem β and provided insights into the mitigation of future climate change by vegetation. © 2023 Elsevier B.V.

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