College of Geomatics, Xi'an University of Science and Technology, Xi'an 710054, China.
College of Geomatics, Xi'an University of Science and Technology, Xi'an 710054, China.
Sci Total Environ. 2024 Nov 15;951:175589. doi: 10.1016/j.scitotenv.2024.175589. Epub 2024 Aug 22.
Terrestrial ecosystems have undergone significant changes as a result of climate change, profoundly affecting global carbon and water cycling processes. Notably, the synergistic changes in vegetation carbon use efficiency (CUE) and water use efficiency (WUE) and their response to patterns of climate change over the last 40 years are unknown. Therefore, in this study, global vegetation WUE and CUE were inverted using Gross primary productivity (GPP), Net primary productivity (NPP) and total evaporation (ET) data from 1981 to 2019 to reveal their temporal and spatial patterns of change through trend analysis and stability analysis. A stepwise regression algorithm was used to reveal the potential driving law of environmental factors on vegetation WUE and CUE. The results shows that (1) From 1981 to 2019, the global vegetation WUE and CUE showed in a relatively stable state, and the trends of WUE and CUE were -0.00004/year and 0.006 g C m mm/year, respectively; (2) the greening of vegetation was the most important cause of the changes in WUE and CUE, and the driving force of rain and heat conditions on the CUE of vegetation was smaller than that of solar radiation and soil water, the regions where CO is the dominant factor affecting CUE and WUE are mainly in the north temperate zone; (3) the region of synergistic growth of WUE and CUE accounts for about 31.38 % of the global terrestrial area, and this pattern of change suggests that the global vegetation carbon sink potential is huge, and the popularization of vegetation planting patterns under the synergistic growth of CUE and WUE should be strengthened. The research has shown that vegetation greening is a key factor influencing changes in the WUE and CUE of vegetation, therefore, the implementation of ecological engineering will be an important step in combating climate change.
由于气候变化，陆地生态系统发生了重大变化，深刻地影响了全球碳和水的循环过程。值得注意的是，过去 40 年来，植被碳利用效率（CUE）和水分利用效率（WUE）的协同变化及其对气候变化模式的响应尚不清楚。因此，本研究利用 1981 年至 2019 年的总初级生产力（GPP）、净初级生产力（NPP）和总蒸发量（ET）数据，反演了全球植被 WUE 和 CUE，通过趋势分析和稳定性分析揭示了其时空变化格局。采用逐步回归算法揭示了环境因素对植被 WUE 和 CUE 的潜在驱动规律。结果表明：（1）1981 年至 2019 年，全球植被 WUE 和 CUE 呈相对稳定状态，WUE 和 CUE 的变化趋势分别为-0.00004/年和 0.006 g C m-2 mm-1/年；（2）植被的绿化是 WUE 和 CUE 变化的最重要原因，降水和热量条件对植被 CUE 的驱动力小于太阳辐射和土壤水分，CO 是影响 CUE 和 WUE 的主导因素的区域主要集中在北温带；（3）WUE 和 CUE 协同增长的区域约占全球陆地面积的 31.38%，这种变化模式表明全球植被碳汇潜力巨大，应加强推广 CUE 和 WUE 协同增长下的植被种植模式。研究表明，植被绿化是影响植被 WUE 和 CUE 变化的关键因素，因此，实施生态工程将是应对气候变化的重要步骤。
