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Decadal change and inter-annual variability of net primary productivity on the Tibetan Plateau

机译：藏高原对净初级生产力的二等变革与年间变异性

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摘要

Net primary productivity (NPP) is an important indicator of plant dynamics and the net carbon exchange between the terrestrial ecosystem and atmosphere. Both the long-term shifts in climate mean (climate change) and short-term variations around the climate mean (climate variability) have impacts on NPP but studies examining both aspects of climate variations are rare especially in the data-scarce regions such as the Tibetan Plateau (TP). Here, we used a dynamic vegetation model to investigate the impacts of the changes and variabilities in temperature, precipitation, cloud cover and CO2 on NPP on the TP. The simulated NPP was evaluated using field and Moderate-Resolution Imaging Spectroradiometer NPP and was found to be reasonable. At monthly time scale, NPP significantly correlated concurrently and at 1-month lag with temperature, precipitation and cloud cover (coefficient of determination, R-2, in 0.52-0.77). Annual NPP variability was high (low) where mean annual NPP was low (high). The effects of annual precipitation, cloud cover and temperature variability on annual NPP variability were spatially heterogeneous, and temperature variability appeared to be the dominant factor (R-2 of 0.74). Whereas, NPP changes were very similar to CO2 increases across the TP (spatial correlation of 0.60), indicating that long-term changes in NPP were dominated by CO2 increases. For both variability and long-term changes in NPP, temperature was the major factor of influence (highest spatial correlation of 0.67). These findings could assist in making informed mitigation policies on the impacts of climate change and variability on ecosystem and local nomadic communities.
机译：净初级生产率（NPP）是植物动力学的重要指标和陆地生态系统与大气之间的净碳交换。气候平均值（气候变化）的长期换档和气候平均值（气候变化）的短期变化对NPP产生影响，但研究了气候变化的两个方面都很罕见，特别是在数据稀缺的地区（如）藏高原（TP）。在这里，我们使用动态植被模型来研究TP对NPP温度，降水，云盖和CO2中的变化和变化和CO2的影响。使用现场和适度分辨率成像光谱辐射器NPP评估模拟的NPP，并被发现是合理的。在月度刻度，NPP随着温度，沉淀和云覆盖（测定系数，R-2，在0.52-0.77中的云覆盖率下显着相关，在1个月的滞后显着相关。年度NPP变异性高（低），平均每年NPP低（高）。年降水量，云盖和温度变化对年度NPP可变性的影响是空间异质的，温度变异性似乎是主要因素（0.74的R-2）。然而，NPP变化与CO 2非常相似的TP（0.60的空间相关性）增加，表明NPP中的长期变化由CO2增加。对于NPP的可变性和长期变化，温度是影响的主要因素（最高空间相关0.67）。这些调查结果可以协助了解关于气候变化和生态系统和地方游牧群群的可变性的影响的知情缓解政策。

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  • 来源
    《Climate dynamics》 |2021年第6期|1837-1857|共21页
  • 作者

    Cuo Lan; Zhang Yongxin; Xu-Ri; Zhou Bingrong;

  • 作者单位

    Chinese Acad Sci Key Lab Tibetan Environm Changes & Land Surface P Inst Tibetan Plateau Res Bldg 3 Courtyard 16 Lin Cui Rd Beijing 100101 Peoples R China|Ctr Excellence Tibetan Plateau Earth Sci Beijing Peoples R China|Univ Chinese Acad Sci Beijing Peoples R China;

    Natl Ctr Atmospher Res POB 3000 Boulder CO 80307 USA;

    Chinese Acad Sci Key Lab Tibetan Environm Changes & Land Surface P Inst Tibetan Plateau Res Bldg 3 Courtyard 16 Lin Cui Rd Beijing 100101 Peoples R China|Ctr Excellence Tibetan Plateau Earth Sci Beijing Peoples R China;

    Qinghai Meteorol Bur Inst Meteorol Xining Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Net primary productivity; Climate; Long-term change; Inter-annual variability; The Tibetan Plateau;

    机译：净初级生产力;气候;长期变化;年间变异性;藏高原;

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