ZHU Jingbin,HE Huidan,ZHANG Fawei,et al.Effect of Temperature Difference Between Day and Night on NEE and Its Variation Characteristics in Alpine Shrubland in Qinghai-Tibetan Plateau[J].Research of Soil and Water Conservation,2020,27(04):232-238.
青藏高原高寒灌丛昼夜温差对NEE的影响及其变化特征
- Title:
- Effect of Temperature Difference Between Day and Night on NEE and Its Variation Characteristics in Alpine Shrubland in Qinghai-Tibetan Plateau
- 文章编号:
- 1005-3409(2020)04-0232-07
- Keywords:
- temperature difference between day and night; alpine shrubland; NEE; the Qinghai-Tibetan Plateau
- 分类号:
- S812
- 文献标志码:
- A
- 摘要:
- 为了探讨气候变化背景下昼夜温差的减小对高寒生态系统碳平衡产生的影响,基于涡度相关系统,利用2009年、2010年、2011年的涡动相关系统观测资料,对青藏高原高寒灌丛昼夜温差对净生态系统CO2交换(NEE)的影响及其变化特征进行了研究。结果表明:高寒灌丛生态系统2009年、2010年、2011年NEE的逐日变化趋势基本一致,最大碳吸收的月份都是7月,分别为-263.49,-318.73,-278.47 g/(m2·月)。就全年来看,高寒灌丛生态系统2009年、2010年、2011年的NEE为-466.19,-483.65,-204.83 g/(m2·a),表现为弱的碳汇。高寒灌丛的日最高温和日最低温在一年中都表现为先增大后减小的变化趋势,而昼夜温差却有着相反的变化趋势。2009年、2010年、2011年昼夜温差的月平均最小值都出现在9月,分别为11.28,12.29,10.87℃,但NEE的月平均最小值都为7月。在2009年、2010年和2011年的5—9月的昼夜温差与NEE都呈显著的负相关关系,说明高寒灌丛在生长季昼夜温差的增大有利于生态系统碳的积累,暗示在未来昼夜温差减小的条件下高寒灌丛可能会促进陆地生态系统的碳损失。
- Abstract:
- In order to explore the effect of the decrease of the temperature difference between day and night on the carbon balance of alpine ecosystem under the background of climate change, based on CO2 flux measured with the eddy covariance technique, we analyzed the relationship between NEE and temperature difference between day and night over an alpine shrubland on the Qinghai-Tibetan Plateau from 2009 to 2011. The results show that the daily change trend of NEE was similar, and the maximum carbon absorption all occurred in July, which were -263.49,-318.73,-278.47 g/(m2·month), respectively; the annual NEE of alpine shrubland ecosystem was -466.19,-483.65,-204.83 g/(m2·a)in 2009, 2010 and 2011, respectively, suggesting that the alpine shrubland ecosystem was a carbon sink; the daily maximum temperature and daily minimum temperature both presented the trend of increasing at first and then decreasing in the whole year, while the temperature difference between day and night presented the opposite trend; furthermore, the minimum monthly average temperature difference between day and night all appeared in September from 2009 to 2011, which were 11.28, 12.29 and 10.87℃, however, the minimum monthly NEE all occurred in July; the temperature difference between day and night showed significant negative correlation with NEE in each month from May to September in 2009, 2010 and 2011, indicating that the increase of temperature difference between day and night in growing season of alpine shrubland was beneficial to the accumulation of carbon in the ecosystem, and suggesting that alpine shrubland might promote the carbon loss of the terrestrial ecosystem under the temperature difference between day and night decrease in the future.
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备注/Memo
收稿日期:2019-09-27 修回日期:2019-10-10
资助项目:国家重点研发计划项目(2017YFA0604801); 青海省科技基础条件平台项目(2018-ZJ-T09); 国家自然基金面上项目(41877547)
第一作者:祝景彬(1989—),男,山东菏泽人,博士生,研究方向为全球变化生态学。E-mail:zhujingbin321@foxmail.com
通信作者:李英年(1952—),男,青海西宁人,研究员,博导,主要从事全球变化生态学研究。E-mail:ynli@nwipb.cas.cn