中国草本沼泽净初级生产力的时空变化及其气候驱动因素

Liyuan Wu, Xiangjin Shen, Jiaqi Zhang, Yiwen Liu, Chen Ding, Rong Ma, Xianguo Lu, Ming Jiang
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引用次数: 0

摘要

草本沼泽在中国分布广泛,对区域生态安全和可持续发展至关重要。植被净初级生产力(NPP)是植被生长的重要指标。气候变化会对净初级生产力产生重大影响,但中国草本沼泽净初级生产力的变化及其对气候变化的响应尚不清楚。本研究利用 2000-2020 年气象数据和 MODIS NPP 数据,分析了中国草本沼泽 NPP 的时空变化及其对气候变化的响应。研究发现,2000-2020年间,中国草本沼泽年NPP以3.34 g C/m2/a的速率显著增加,平均值为336.60 g C/m2。年总降水量的增加提高了全国平均净生产力,而年平均气温对全国平均净生产力无明显影响。从地区来看,降水对温带半干旱和干旱地区以及温带半湿润和湿润沼泽地区的净生产力有明显的正效应。我们首次在中国草本沼泽中发现了昼夜温度对NPP的非对称效应。在温带湿润和半湿润沼泽地区,夏季白天温度升高会降低净生产力,而夏季夜间温度升高则会提高净生产力。在青藏高原,秋季昼间温度以及夏季昼夜温度的升高可增加草本沼泽的净生产力。本研究强调了季节性气候变化对中国草本沼泽净生产力的不同影响,并指出在陆地生态系统模型中模拟草本沼泽净生产力时应考虑昼夜温度的不同影响,尤其是在全球非对称昼夜变暖的背景下。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Spatial and temporal variation of net primary productivity of herbaceous marshes and its climatic drivers in China
Herbaceous marshes are widely distributed in China and are vital to regional ecological security and sustainable development. Vegetation net primary productivity (NPP) is a vital indicator of vegetation growth. Climatic change can significantly affect NPP, but variations in NPP of herbaceous marsh and their responses to climate change in China remain unclear. Using meteorological data and MODIS NPP data during 2000-2020, this study analyzed the spatial and temporal variations of NPP and their responses to climate change in Chinese herbaceous marshes. We found that the annual NPP of herbaceous marshes in China increased significantly at a rate of 3.34 g C/m2/a from 2000 to 2020, with an average value of 336.60 g C/m2. The increased annual total precipitation enhanced the national average NPP, whereas annual mean temperature had no significant effect on the national average NPP. Regionally, precipitation had a significant positive effect on the NPP in temperate semi-arid and arid and temperate semi-humid and humid marsh regions. For the first time, we discovered asymmetry effects of daytime and nighttime temperatures on NPP in herbaceous marshes of China. In temperate humid and semi-humid marsh regions, increased summer daytime temperature decreased the NPP while increased summer nighttime temperature increased the NPP. In the Tibetan Plateau, increased autumn daytime temperature, as well as summer daytime and nighttime temperatures could increase the NPP of herbaceous marshes. This study highlights the different influences of seasonal climate change on the NPP of herbaceous marshes in China and indicates that the differential effects of daytime and nighttime temperatures should be considering in simulating the NPP of herbaceous marshes in terrestrial ecosystem models, especially under the background of global asymmetric diurnal warming.
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