Change and relationship between growing season metrics and net primary productivity in forestland and grassland in China

IF 3.9 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Carbon Balance and Management Pub Date : 2023-12-21 DOI:10.1186/s13021-023-00245-x

Linli Cui, Jun Shi, Fengjin Xiao

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Abstract

Background

Vegetation phenology can characterize ecosystem functions and plays a key role in the dynamics of plant productivity. Here we investigated the changes in growing season metrics (start of growing season, SOS; end of growing season, EOS; length of growing season, LOS) and their relationships with net primary productivity (NPP) in forestland and grassland in China during 1981–2016.

Results

SOS advanced, EOS delayed, LOS prolonged and NPP increased significantly in 23.7%, 21.0%, 40.5% and 19.9% of the study areas, with an average rate of 3.9 days decade⁻¹, 3.3 days·decade⁻¹, 6.7 days·decade⁻¹ and 10.7 gC m⁻²·decade⁻¹, respectively. The changes in growing season metrics were obvious in Northwest China (NWC) and North China (NC), but the least in Northeast China (NEC). NPP was negatively correlated with SOS and positively correlated with EOS and LOS in 22.0%, 16.3% and 22.8% of the study areas, respectively, and the correlation between NPP and growing season metrics was strong in NWC, NC and Southwest China (SWC), but weak in NEC and South China (SC).

Conclusion

The advanced SOS, delayed EOS and prolonged LOS all contribute to the increased NPP in forestland and grassland in China, especially in NWC, NC and SWC. This study also highlights the need to further study the response of NPP to growing season changes in different regions and under the influence of multiple factors.

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中国林地和草地生长季指标与净初级生产力的变化及关系。

背景：植被物候可以描述生态系统的功能，并在植物生产力的动态变化中发挥关键作用。在此，我们研究了 1981-2016 年间中国林地和草地生长季指标（生长季开始，SOS；生长季结束，EOS；生长季长度，LOS）的变化及其与净初级生产力（NPP）的关系：结果：23.7%、21.0%、40.5%和 19.9%的研究区域的生长季提前、生长季延迟、生长季延长和净初级生产力显著增加，平均速率分别为 3.9 天-10 年-1、3.3 天-10 年-1、6.7 天-10 年-1 和 10.7 gC m-2-decade-1 。西北和华北地区生长季指标变化明显，东北地区变化最小。NPP与SOS呈负相关，与EOS和LOS呈正相关的研究区域分别占22.0%、16.3%和22.8%，NPP与生长季指标的相关性在西北、华北和西南地区较强，而在东北和华南地区较弱：结论：提前的 SOS、延迟的 EOS 和延长的 LOS 都有助于提高中国林地和草地的 NPP，尤其是在西北干旱带、华北干旱带和西南干旱带。本研究还强调了进一步研究不同地区和多因素影响下 NPP 对生长季节变化的响应的必要性。

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来源期刊

Carbon Balance and Management Environmental Science-Management, Monitoring, Policy and Law

CiteScore

7.60

自引率

0.00%

发文量

审稿时长

14 weeks

期刊介绍： Carbon Balance and Management is an open access, peer-reviewed online journal that encompasses all aspects of research aimed at developing a comprehensive policy relevant to the understanding of the global carbon cycle. The global carbon cycle involves important couplings between climate, atmospheric CO2 and the terrestrial and oceanic biospheres. The current transformation of the carbon cycle due to changes in climate and atmospheric composition is widely recognized as potentially dangerous for the biosphere and for the well-being of humankind, and therefore monitoring, understanding and predicting the evolution of the carbon cycle in the context of the whole biosphere (both terrestrial and marine) is a challenge to the scientific community. This demands interdisciplinary research and new approaches for studying geographical and temporal distributions of carbon pools and fluxes, control and feedback mechanisms of the carbon-climate system, points of intervention and windows of opportunity for managing the carbon-climate-human system. Carbon Balance and Management is a medium for researchers in the field to convey the results of their research across disciplinary boundaries. Through this dissemination of research, the journal aims to support the work of the Intergovernmental Panel for Climate Change (IPCC) and to provide governmental and non-governmental organizations with instantaneous access to continually emerging knowledge, including paradigm shifts and consensual views.