Seasonal droughts drive up carbon gain in a sub-tropical forest

IF 3 2区环境科学与生态学 Q2 ECOLOGY

Journal of Plant Ecology Pub Date : 2022-09-07 DOI:10.1093/jpe/rtac088

Brian Njoroge Mwangi, Yuelin Li, D. Otieno, Shi-zhong Liu, Shimin Wei, Ze Meng, Qianmei Zhang, De-qiang Zhang, Juxiu Liu, G. Chu, F. Haider, J. Tenhunen

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引用次数: 2

Abstract

The study aimed to show that droughts are increasing in frequency and intensity in the Dinghushan Biosphere Reserve and to illustrate the effects of seasonal droughts on carbon gain in a sub-tropical forest. This is in response to the threat posed by increased droughts due to global climate change. We used four drought indices to accurately determine periods of drought and periods of increased precipitation. Thereafter, the measured eddy flux and soil moisture content data collected from 2003 to 2014 were compared between the droughts and wet periods to determine drought impacts on the ecosystem carbon gain. Drought accounted for about 20% of the 12-year study period, with the highest drought events and severity occurring between 2012 and 2013. The average annual precipitation and air temperature during the study period were 1404.57 ±43.2 mm and 22.65 ±0.1 ℃, respectively, showing a decrease of 523 mm in precipitation and an increase of 2.55 ℃ in temperature, compared to the 30-year records (1990-2020). Contrary to most published data for most forest ecosystems globally, Dinghushan Biosphere Reserve recorded significant carbon gain during 60% of the drought period.

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季节性干旱增加了亚热带森林的碳含量

该研究旨在表明鼎湖山生物圈保护区的干旱频率和强度正在增加，并说明季节性干旱对亚热带森林碳增加的影响。这是为了应对全球气候变化导致的干旱加剧所带来的威胁。我们使用了四个干旱指数来准确确定干旱期和降水增加期。此后，将2003年至2014年收集的涡通量和土壤含水量数据在干旱期和湿润期进行比较，以确定干旱对生态系统碳增益的影响。干旱约占12年研究期的20%，2012年至2013年期间发生的干旱事件和严重程度最高。研究期间的年平均降水量和气温分别为1404.57±43.2毫米和22.65±0.1℃，与30年记录（1990-2020年）相比，降水量减少了523毫米，气温上升了2.55℃。与全球大多数森林生态系统的大多数已公布数据相反，鼎湖山生物圈保护区在60%的干旱期记录了显著的碳增加。

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来源期刊

Journal of Plant Ecology 生物-植物科学

CiteScore

4.60

自引率

18.50%

发文量

134

审稿时长

3 months

期刊介绍： Journal of Plant Ecology (JPE) serves as an important medium for ecologists to present research findings and discuss challenging issues in the broad field of plants and their interactions with biotic and abiotic environment. The JPE will cover all aspects of plant ecology, including plant ecophysiology, population ecology, community ecology, ecosystem ecology and landscape ecology as well as conservation ecology, evolutionary ecology, and theoretical ecology.