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Vegetation Types Shift Physiological and Phenological Controls on Carbon Sink Strength in a Coastal Zone
Global Change Biology ( IF 10.8 ) Pub Date : 2025-01-24 , DOI: 10.1111/gcb.70029
Siyu Wei, Adina Paytan, Xiaojing Chu, Xiaoshuai Zhang, Weimin Song, Xiaojie Wang, Peiguang Li, Guangxuan Han

The carbon sink function performed by the different vegetation types along the environmental gradient in coastal zones plays a vital role in mitigating climate change. However, inadequate understanding of its spatiotemporal variations across different vegetation types and associated regulatory mechanisms hampers determining its potential shifts in a changing climate. Here, we present long‐term (2011–2022) eddy covariance measurements of the net ecosystem exchange (NEE) of CO2 at three sites with different vegetation types (tidal wetland, nontidal wetland, and cropland) in a coastal zone to examine the role of vegetation type on annual carbon sink strength. We found that the three study sites are stable carbon sinks and are influenced by their distinct physiological and phenological factors. The annual NEE of the tidal wetland, nontidal wetland, and cropland were determined predominantly by the seasonal peaks of net CO2 uptake, release, and duration of CO2 uptake period. Furthermore, the changes in annual NEE were sensitive to climatic variables, as spring mean air temperature reduced the carbon sink strength in the tidal wetland, maximum daily precipitation in summer reduced it in the nontidal wetland, and summer mean global radiation elicited the same effect in the cropland. Finally, a worldwide database of the three vegetation types was compiled, using which we further validated the global consistency of the biological controls. Overall, these results emphasize the importance of considering the underlying mechanisms by which vegetation types influence NEE for the accurate forecasting of carbon sink dynamics across different coastal vegetation types under climate change.

中文翻译:


植被类型改变了对沿海地区碳汇强度的生理和物候控制



沿沿海地区环境梯度的不同植被类型执行的碳汇功能在缓解气候变化方面起着至关重要的作用。然而,对其在不同植被类型的时空变化和相关调节机制的了解不足阻碍了确定其在不断变化的气候中的潜在变化。在这里,我们提出了沿海地区具有不同植被类型(潮汐湿地、非潮汐湿地和农田)的三个地点 CO2 净生态系统交换 (NEE) 的长期(2011-2022 年)涡度相关测量,以检查植被类型对年碳汇强度的作用。研究发现,3 个研究地点是稳定的碳汇,并受其独特的生理和物候因素的影响。潮汐湿地、非潮汐湿地和农田的年新环境系数主要由二氧化碳净吸收、释放和 CO2 吸收期持续时间的季节峰值决定。此外,年平均气温对气候变量敏感,春季平均气温降低了潮汐湿地的碳汇强度,夏季最大日降水量降低了非潮汐湿地的碳汇强度,夏季平均全球辐射在农田中引起了相同的影响。最后,我们编制了三种植被类型的全球数据库,使用该数据库进一步验证了生物控制的全球一致性。总体而言,这些结果强调了考虑植被类型影响 NEE 的潜在机制对于准确预测气候变化下不同沿海植被类型的碳汇动态的重要性。
更新日期:2025-01-24
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