Effects of Extreme Precipitation Events at Different Growth Stages on Net Productivity of Artificial Coniferous Forest—A Case Study of Qianyanzhou Ecological Experimental Station in Ji'an City of Jiangxi Province

Chen Chen; Jia Chang; Wang Jingyuan; Tang Yakun; Chen Yunming

doi:10.13961/j.cnki.stbctb.2020.02.045

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Effects of Extreme Precipitation Events at Different Growth Stages on Net Productivity of Artificial Coniferous Forest—A Case Study of Qianyanzhou Ecological Experimental Station in Ji'an City of Jiangxi Province

- Effects of Extreme Precipitation Events at Different Growth Stages on Net Productivity of Artificial Coniferous Forest—A Case Study of Qianyanzhou Ecological Experimental Station in Ji'an City of Jiangxi Province
- Bulletin of Soiland Water Conservation Vol. 40, Issue 2, Pages: 317-324(2020)
- 作者机构：
  
  1. 西北农林科技大学水土保持研究所, 陕西杨凌,712100
  2. 西北农林科技大学林学院, 陕西杨凌,712100
  3. 中国科学院地理科学与资源研究所生态系统网络观测与模拟院重点实验室,北京,100101
  4. 西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西杨凌,712100
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2020.02.045
  CLC： S718.5
- Published：2020
- 稿件说明：
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Chen Chen, Jia Chang, Wang Jingyuan, et al. Effects of Extreme Precipitation Events at Different Growth Stages on Net Productivity of Artificial Coniferous Forest—A Case Study of Qianyanzhou Ecological Experimental Station in Ji'an City of Jiangxi Province[J]. Bulletin of Soiland Water Conservation, 2020, 40(2): 317-324.
DOI：

Chen Chen, Jia Chang, Wang Jingyuan, et al. Effects of Extreme Precipitation Events at Different Growth Stages on Net Productivity of Artificial Coniferous Forest—A Case Study of Qianyanzhou Ecological Experimental Station in Ji'an City of Jiangxi Province[J]. Bulletin of Soiland Water Conservation, 2020, 40(2): 317-324. DOI： 10.13961/j.cnki.stbctb.2020.02.045.

摘要

[目的

]

研究不同生长时期极端降水事件对生态系统碳通量的影响，为准确评估江西省吉安市千烟洲人工针叶林生态系统应对极端天气的响应机制提供理论基础。[方法

]

对比2008年与2010年植物生长初期（4月）与生长旺盛期（6月）碳通量对环境因子（净辐射RN、温度TA、土壤含水量SWC与增强型植被指数EVI）变化的响应差异。[结果

]

4月份净生态系统生产力（NEP）降低22.87%，主要是初级生产总量和生态系统呼吸分别降低17.36%[GEP，9.56 g/（m

·d）

]

和2.84%[RE，2.86 g/（m

·d）

]

导致，而6月份GEP降低3.58%[7.17 g/（m

·d）

]

以及RE增长12.8%[20.37 g/（m

·d）

]

导致NEP降低65.77%[27.55 g/（m

·d）

]

。[结论

]

生长季初期TA降低对RE的抑制大于土壤含水量增加的影响，而生长旺盛期土壤含水量增加则会抵消降温对呼吸的抑制，造成更大的碳损失，因此后续研究森林生态系统碳通量对极端气候响应时还需要考虑植物生长时期的影响。

Abstract

[Objective] The effects of extreme precipitation events on ecosystem carbon flux in different growth periods were studied

in order to provide a theoretical basis for accurately assessing the response mechanism of an artificial coniferous forest ecosystem to extreme weather at Qianyanzhou of Ji'an City

Jiangxi Province.[Methods] The response of carbon flux to changes in environmental factors (net radiation RN

temperature TA

soil water content SWC

and enhanced vegetation index EVI) in the early growth period (April) and flourishing period (June) in 2008 and 2010 were compared.[Results] The net ecosystem productivity (NEP) decreased by 22.87% in April

mainly due to a decrease of 17.36%[GEP

9.56 g/(m2·d)] in total primary production and 2.84%[RE

2.86 g/(m2·d)] in ecosystem respiration by 17.36%[GEP

9.56 g/(m2·d)]. While in June

a decrease of 3.58%[7.17 g/(m2·d)] in GEP and an increase of 12.8%[20.37 g/(m2·d)] in RE

led to a decrease of 65.77%[27.55 g/(m2·d)] in NEP.[Conclusion] The inhibition of RE caused by the reduction of TA at the early growing season was greater than that caused by the increase of soil moisture content

while the increase in soil moisture during the flourishing period would offset the inhibition of cooling on respiration

resulting in greater carbon loss. Therefore

the impacts of carbon flux on extreme climate should also be considered in future studies.

关键词

Keywords

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