青藏高原总初级生产力对山洪暴发干旱的响应

IF 2.6 3区环境科学与生态学 Q2 ECOLOGY

Ecological Modelling Pub Date : 2024-11-25 DOI:10.1016/j.ecolmodel.2024.110953

Tao Sun, Xinhua Zhang, Yujie Cai, Chun Yang, Zhurui Gao

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引用次数: 0

摘要

预计山洪暴发将成为未来的 "新常态"，对陆地生态系统的碳动态产生重大影响。由于山洪暴发迅速、加剧迅速、持续时间短，因此很难捕捉其对陆地碳动态的影响。迄今为止，青藏高原区域陆地碳动态对山洪灾害的响应模式仍不清楚。我们利用ERA5-Land土壤水分数据，通过分析土壤水分下降率和干旱持续时间，确定了青藏高原多次亚季节性闪旱事件。基于中分辨率成像分光仪（MODIS）在山洪暴发期间观测到的总初级生产力（GPP）的动态变化，我们提出了响应强度指数（RII）来量化GPP对这些事件的响应强度。此外，我们还通过偏相关分析，研究了山洪暴发期间气候因素对 GPP 的影响。我们发现，山洪暴发频率高的地区分布在 QTP 的北部、东部和东南部边缘（超过 1.6 次/年），而频率低的地区则位于西部地区（低于 0.4 次/年）。50.36% 的 QTP 暴旱事件对 GPP 有明显响应。不同植被类型的 GPP 响应强度差异很大，草甸 GPP 响应强度最高（RII 为 1.867），森林 GPP 响应强度最低（RII 为 1.585）。气候因素对山洪暴发干旱期间的全球升温潜能值有显著影响，不同植被类型之间也存在差异。植被类型、气候条件以及山洪暴发的频率和持续时间可能会导致对山洪暴发的 GPP 响应的差异。这些发现为生态系统的碳封存管理提供了宝贵的见解，为未来的环境管理、气候变化适应和生态保护提供了重要指导。

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Response of gross primary productivity to flash droughts on the Qinghai-Tibetan Plateau

Flash droughts are expected to become the 'new normal' in the future, significantly affecting the carbon dynamics of terrestrial ecosystems. The rapid onset, swift intensification, and short duration of flash droughts make their impact on terrestrial carbon dynamics challenging to capture. To date, the response pattern of regional terrestrial carbon dynamics to flash droughts on the Qinghai-Tibetan plateau (QTP) remains unclear. Utilizing ERA5-Land soil moisture data, we identified numerous sub-seasonal flash drought events on the QTP by analyzing the decline rate of soil moisture and drought duration. Based on the dynamics of Moderate Resolution Imaging Spectroradiometer (MODIS) gross primary productivity (GPP) changes observed during flash droughts, we proposed the Response Intensity Index (RII) to quantify the intensity of GPP responses to these events. Additionally, through partial correlation analysis, we examined the effects of climatic factors on GPP during flash droughts. We found that areas with high frequencies of flash droughts are distributed in the northern, eastern, and southeastern margins of the QTP (more than 1.6 times/year), while areas with low frequencies are located in the western region (less than 0.4 times/year). GPP significantly responded to 50.36% of the flash drought events on the QTP. The intensity of GPP response varied significantly among vegetation types, with meadow GPP exhibiting the highest responsiveness (RII of 1.867) and forest GPP the lowest (RII of 1.585). Climatic factors exerted significant effects on GPP during flash droughts, with variations observed across different vegetation types. Differences in GPP response to flash droughts may be attributed to vegetation type, climatic conditions, and the frequency and duration of flash droughts. These findings provide valuable insights for managing carbon sequestration in ecosystems, offering essential guidance for future environmental management, climate change adaptation, and ecological conservation.

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来源期刊

Ecological Modelling 环境科学-生态学

CiteScore

5.60

自引率

6.50%

发文量

259

审稿时长

69 days

期刊介绍： The journal is concerned with the use of mathematical models and systems analysis for the description of ecological processes and for the sustainable management of resources. Human activity and well-being are dependent on and integrated with the functioning of ecosystems and the services they provide. We aim to understand these basic ecosystem functions using mathematical and conceptual modelling, systems analysis, thermodynamics, computer simulations, and ecological theory. This leads to a preference for process-based models embedded in theory with explicit causative agents as opposed to strictly statistical or correlative descriptions. These modelling methods can be applied to a wide spectrum of issues ranging from basic ecology to human ecology to socio-ecological systems. The journal welcomes research articles, short communications, review articles, letters to the editor, book reviews, and other communications. The journal also supports the activities of the [International Society of Ecological Modelling (ISEM)](http://www.isemna.org/).