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Asymmetric patterns and temporal changes in phenology-based seasonal gross carbon uptake of global terrestrial ecosystems
Global Ecology and Biogeography ( IF 6.4 ) Pub Date : 2020-03-10 , DOI: 10.1111/geb.13084
Lanhui Wang 1 , Feng Tian 2 , Ke Huang 1, 3 , Yuhang Wang 1, 4 , Zhendong Wu 1, 2 , Rasmus Fensholt 1
Affiliation  

Aim: To study global patterns and temporal changes in the seasonal dynamics (quantity and seasonal distribution) of terrestrial gross carbon uptake in response to global environmental change. Location: Global. Time period: 2000–2016. Major taxa studied: Terrestrial ecosystems. Methods: Following a phenology-based definition of photosynthetic seasonality, we decompose gross primary production (GPP) into three periods, green-up, maturity and senescence, and derive their corresponding GPP (GPPgp, GPPmp and GPPsp, respectively) from a newly developed time series of satellite-based global GPP to study spatio-temporal dynamics of seasonal GPP. Results: We find that the global fraction of GPPsp (19.8%) is larger than GPPgp (14.3%), indicating a globally asymmetric seasonal distribution of gross carbon uptake by terrestrial ecosystems. Globally, GPPmp plays a dominant role in shaping spatial patterns and increasing/decreasing trends in GPP, while GPPgp/GPPsp contributes to increasing GPP at the regional scale. Higher fractions of GPPgp/GPPmp (lower of GPPsp), as well as the co-occurrence of increasing GPP and non-tree vegetation cover in major croplands, are likely to be caused by agricultural intensification. Global changes in GPPgp and GPPsp are closely related to changes in their seasonal distributions (R =.86/.8, respectively), whereas this relationship is weaker for GPPmp (R =.53). Finally, high correlations are observed between changes in GPPgp and GPPsp and changes in their durations (R =.78/.78, respectively), while GPPmp shows a relatively lower correlation with its duration (R =.67). Main conclusions: The asymmetric spatio-temporal patterns in the seasonal dynamics of global terrestrial gross carbon uptake found here have been substantially reshaped by anthropogenic land-use/cover changes and changes in photosynthetic phenology. Compared to calendar-based meteorological seasons more suitable for temperate/subpolar ecosystems, our phenology-based approach is expected to provide an alternative starting point for a better understanding of global spatio-temporal changes in the seasonal dynamics of terrestrial ecosystem processes and functioning under accelerating global change. (Less)

中文翻译:

全球陆地生态系统基于物候的季节性总碳吸收的不对称模式和时间变化

目的:研究响应全球环境变化的陆地总碳吸收的季节性动态(数量和季节分布)的全球模式和时间变化。地点:全球。时间段:2000-2016。研究的主要分类群:陆地生态系统。方法:根据光合季节性的基于物候学的定义,我们将初级生产总值 (GPP) 分解为三个时期,即绿化期、成熟期和衰老期,并从新开发的基于卫星的全球 GPP 的时间序列,以研究季节性 GPP 的时空动态。结果:我们发现 GPPsp 的全球比例(19.8%)大于 GPPgp(14.3%),表明全球陆地生态系统总碳吸收量的季节性分布不对称。在全球范围内,GPPmp 在塑造空间格局和 GPP 增加/减少趋势方面起主导作用,而 GPPgp/GPPsp 有助于增加区域尺度的 GPP。GPPgp/GPPmp 的较高比例(GPPsp 中的较低者),以及主要农田中 GPP 和非树木植被覆盖增加的同时发生,很可能是由农业集约化造成的。GPPgp 和 GPPsp 的全球变化与其季节性分布的变化密切相关(分别为 R = .86/.8),而 GPPmp 的这种关系较弱(R = .53)。最后,在 GPPgp 和 GPPsp 的变化与其持续时间的变化之间观察到高相关性(分别为 R = .78/.78),而 GPPmp 显示与其持续时间的相关性相对较低(R = .67)。主要结论:在此发现的全球陆地总碳吸收季节性动态中的不对称时空模式已被人为土地利用/覆盖变化和光合物候变化的实质性重塑。与更适合温带/亚极地生态系统的基于日历的气象季节相比,我们基于物候学的方法有望为更好地了解全球陆地生态系统过程的季节性动态的时空变化提供一个替代起点,并在加速下发挥作用。全球变化。(较少的)我们基于物候学的方法有望提供一个替代起点,以更好地了解陆地生态系统过程的季节性动态和在加速的全球变化下运作的全球时空变化。(较少的)我们基于物候学的方法有望提供一个替代起点,以更好地了解陆地生态系统过程的季节性动态和在加速的全球变化下运作的全球时空变化。(较少的)
更新日期:2020-03-10
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