辽西樟子松人工林净生态系统碳交换

doi:10.13287/j.1001-9332.202205.001

应用生态学报 ›› 2022, Vol. 33 ›› Issue (5): 1183-1190.doi: 10.13287/j.1001-9332.202205.001

辽西樟子松人工林净生态系统碳交换

高翔^1,2, 周宇^1,2, 孟平^1,2, 裴松义³, 张劲松^1,2*

¹中国林业科学研究院林业研究所, 国家林业和草原局林木培育重点实验室, 北京 100091;
²南京林业大学南方现代林业协同创新中心, 南京210037;
³国有建平县黑水机械化林场, 辽宁朝阳 122000

收稿日期:2021-09-08 接受日期:2021-12-03 出版日期:2022-05-15 发布日期:2022-11-15
通讯作者: * E-mail: zhangjs@caf.ac.cn
作者简介:高翔, 男, 1989年生, 助理研究员。主要从事森林生态系统水热碳循环研究。E-mail: gaoxiang@caf.ac.cn
基金资助:
中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2018ZA001)资助。

Net ecosystem exchange of Pinus sylvestris var. mongolica plantation in the western Liaoning Province, China

GAO Xiang^1,2, ZHOU Yu^1,2, MENG Ping^1,2, PEI Song-yi³, ZHANG Jin-song^1,2*

¹Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China;
²Collaborative Innovation Center of Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China;
³State Owned Jianping County Heishui Mechanized Forest Farm, Chaoyang 122000, Liaoning, China

Received:2021-09-08 Accepted:2021-12-03 Online:2022-05-15 Published:2022-11-15

摘要/Abstract

摘要： 樟子松是三北地区造林的主要树种之一,研究樟子松人工林净生态系统碳交换(NEE)及其影响要素对理解我国人工林碳平衡有重要意义。本研究以辽西樟子松人工林为对象,采用涡度相关系统及其配套设备于2020年对樟子松人工林NEE和环境要素进行了原位连续观测。结果表明: 在0.5 h尺度上,1—12月夜间为碳源,白天为碳汇,且受干旱影响5—8月下午碳吸收受到明显抑制。在日尺度上,受干旱影响,控制夜间NEE季节动态的主要要素为土壤温度和土壤湿度,控制白天NEE季节动态的主要要素为土壤湿度和饱和水汽压差;土壤干旱时降水可促进夜间和白天NEE,并导致光合呼吸参数升高。在月尺度上,白天NEE与表观量子利用效率和最大光合速率均呈显著负相关,当空气温度小于5 ℃时,10 ℃生态系统呼吸和生态系统呼吸温度敏感性随空气温度降低而呈线性增加。2020年辽西樟子松人工林NEE积累量为-145.17 g C·m^-2,表现为弱碳汇。

关键词: 涡度相关, 樟子松人工林, 净生态系统碳交换

Abstract: Pinus sylvestris var. mongolica is one of the important tree species for afforestation in Three-North Regions of China. Investigating net ecosystem exchange (NEE) and its influencing factors is of significance in understanding carbon balance of P. sylvestris var. mongolica plantation . We used the eddy covariance system and its supporting instruments to measure NEE and environmental factors of P. sylvestris var. mongolica plantation in the western Liaoning Province in 2020. The results showed that, at the half-hour scale, plantation emitted carbon during nighttime and sequestrated carbon over daytime. Carbon sequestration was inhibited by drought stress in the afternoon from May to August. At the daily scale, seasonal dynamics of nighttime NEE were mainly controlled by soil temperature and moisture, while that of daytime NEE were mainly controlled by soil moisture and vapor pressure deficit due to drought stress. When soil was dry, precipitation promoted nighttime and daytime NEE and improved photosynthetic and respiration parameters. At the month scale, there was significant negative linear relationship of daytime NEE with ecosystem apparent quantum yield and ecosystem maximum photosynthetic capacity. When air temperature was lower than 5 ℃, ecosystem respiration rate at 10 ℃ and temperature sensitivity of ecosystem respiration increased linearly with decreasing air temperature. The cumulative NEE of P. sylvestris var. mongolica plantation was -145.17 g C·m^-2, indicating a weak carbon sink in 2020.

Key words: eddy covariance, Pinus sylvestris var. mongolica plantation, net ecosystem exchange

高翔, 周宇, 孟平, 裴松义, 张劲松. 辽西樟子松人工林净生态系统碳交换[J]. 应用生态学报, 2022, 33(5): 1183-1190.

GAO Xiang, ZHOU Yu, MENG Ping, PEI Song-yi, ZHANG Jin-song. Net ecosystem exchange of Pinus sylvestris var. mongolica plantation in the western Liaoning Province, China[J]. Chinese Journal of Applied Ecology, 2022, 33(5): 1183-1190.

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辽西樟子松人工林净生态系统碳交换

Net ecosystem exchange of Pinus sylvestris var. mongolica plantation in the western Liaoning Province, China

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