中国气象局乌鲁木齐沙漠气象研究所杨帆团队在研究塔克拉玛干沙漠人工绿地碳汇的降水控制中取得新进展。该研究于2024年5月22日发表于国际一流学术期刊《大气科学进展》杂志上。

据悉，治理荒漠化不仅可以改善干旱区的自然环境，而且可以将荒漠化土地转化为重要的陆地碳汇，从而增强干旱生态系统的固碳能力。然而，长期以来对荒漠化治理的潜在碳汇效益及其与环境因素的关系的忽视，限制了人们对碳汇潜力的探索。

研究团队基于2018-2019年塔克拉玛干沙漠人工防护林的CO₂通量和环境因子，分析发现，沙漠人工防护林建立后，由于植物光合作用，沙漠生态系统的碳储量增加了约140倍。降水水平<2mm的降水量对人工防护林的碳交换没有影响，而约4mm降水在短时间内(约3d)刺激了蒸汽压差赤字的降低，促进了人工防护林的光合作用并增强了人工防护林的碳吸收。

降水水平>8mm的降水事件刺激土壤呼吸释放CO₂，促进植物光合作用。在降水刺激土壤呼吸和光合作用的动态平衡中，在5cm (0.12m³ m^-3)处有一个显著的土壤水湿度阈值，可以作为降水对两者的刺激作用强度的良好指标。研究结果为量化干旱区人工造林对固碳的贡献提供了重要的数据支持，并为制定和实施人工林管理措施提供了指导。

附：英文原文

Title: Precipitation controls on Carbon Sinks in an Artificial Green Space in the Taklimakan Desert

Author: Yingwei Sun, Fan Yang, Jianping Huang, Xinqian Zheng, Ali Mamtimin, Chenglong Zhou, Silalan Abudukade, Jiacheng Gao, Chaofan Li, Mingjie Ma, Wen Huo, Xinghua Yang

Issue&Volume: 2024-05-22

Abstract: Control of desertification can not only ameliorate the natural environment of arid regions but also convert desertified land into significant terrestrial carbon sinks, thereby bolstering the carbon sequestration capacity of arid ecosystems. However, longstanding neglect of the potential carbon sink benefits of desertification management, and its relationship with environmental factors has limited the exploration of carbon sequestration potential. Based on CO₂ flux and environmental factors of artificial protective forest in Taklamakan Desert (TD) from 2018 to 2019, we found that the carbon storage capacity of the desert ecosystem increased approximately 140-fold after the establishment of an artificial shelter forest in the desert, due to plant photosynthesis. Precipitation levels < 2 mm had no impact on carbon exchange in the artificial shelter forest, whereas a precipitation level of approximately 4 mm stimulated a decrease in the vapour pressure deficit over a short period of about three days, promoting photosynthesis and enhancing the carbon absorption of the artificial shelter forest. Precipitation events > 8 mm stimulated soil respiration to release CO₂ and promoted plant photosynthesis. In the dynamic equilibrium where precipitation stimulates both soil respiration and photosynthesis, there is a significant threshold value of soil moisture at 5 cm (0.12 m³ m^-3), which can serve as a good indicator of the strength of the stimulatory effect of precipitation on both. These results provide important data support for quantifying the contribution of artificial afforestation to carbon sequestration in arid areas, and provide guidance for the development and implementation of artificial forest management measures.

DOI: 10.1007/s00376-024-3367-8

Source: http://www.iapjournals.ac.cn/aas/en/article/doi/10.1007/s00376-024-3367-8viewType=HTML