环剥对毛白杨树干表面CO2通量及其温度敏感性的影响

doi:10.11707/j.1001-7488.20190501

林业科学 ›› 2019, Vol. 55 ›› Issue (5): 1-10.doi: 10.11707/j.1001-7488.20190501

环剥对毛白杨树干表面CO₂通量及其温度敏感性的影响

张茜茜¹, 杨庆朋², 刘亮¹, 王清涛³, 李菲¹, 郭丽丽¹, 郝立华¹, 曹旭¹, 范晓懂¹, 梁伟佳¹, 郑云普¹

1. 河北工程大学水利水电学院邯郸 056038;
2. 中国科学院沈阳应用生态研究所中国科学院森林生态与管理重点实验室沈阳 110016;
3. 河北工程大学园林与生态工程学院邯郸 056038

收稿日期:2018-06-29 修回日期:2018-10-28 出版日期:2019-05-25 发布日期:2019-05-20
基金资助:
国家自然科学基金项目（31570402，31400418）；河北省自然科学基金项目（C2016402088）；河北省高等学校青年拔尖人才计划项目（BJ2016012）；河北省引进留学人员资助项目（CN201702）；河北省研究生创新能力资助项目（CXZZSS2019070）；河北省创新能力提升计划科技研发平台建设专项（18965307H）；中国博士后科学基金项目（2014M561044，2016T90128）。

Effects of Girdling on Stem CO₂ Efflux and Its Temperature Sensitivity of Populus tomentosa

Zhang Xixi¹, Yang Qingpeng², Liu Liang¹, Wang Qingtao³, Li Fei¹, Guo Lili¹, Hao Lihua¹, Cao Xu¹, Fan Xiaodong¹, Liang Weijia¹, Zheng Yunpu¹

1. School of Water Conservancy and Hydroelectric Power, Hebei University of Engineering Handan 056038;
2. Key Laboratory of Forest Ecology and Management, Chinese Academy of Sciences Institute of Applied Ecology, Chinese Academy of Sciences Shenyang 110016;
3. School of Landscape and Ecological Engineering, Hebei University of Engineering Handan 056038

Received:2018-06-29 Revised:2018-10-28 Online:2019-05-25 Published:2019-05-20

摘要/Abstract

摘要： [目的]探明光合产物供应状况对树干表面CO₂通量及其温度敏感性的影响机制。[方法]以10年生毛白杨人工林为研究对象，采用随机区组试验设计，通过环剥改变林木的光合产物供应状况，连续监测环剥点上部（AG）和下部（BG）的树干表面CO₂通量（E_s）和树干温度（T_stem）并拟合其温度敏感性（Q₁₀），同时测定AG和BG非结构性碳水化合物含量的动态变化，比较生长季和非生长季的E_s及其Q₁₀对底物变化的不同响应。[结果]1）相比于对照树木（NG），环剥处理30天后，环剥导致生长季AG的E_s升高57%和BG的E_s降低43%，但在非生长季NG、AG和BG的E_s差异不明显。2）环剥降低生长季AG和BG的可溶性糖浓度29%和15%，而非生长季环剥导致AG和BG的可溶性糖浓度分别降低15%和增加10%。3）不同季节E_s和T_stem均存在较好的指数函数关系，但环剥会降低AG和BG的T_stem对E_s变化解释率。4）环剥提高生长季和非生长季AG的温度敏感性（Q₁₀）和树干基础呼吸速率（R₁₅），但却同时降低BG的Q₁₀和R₁₅。[结论]环剥阻断了光合产物的输入，从而改变树体环剥点上、下部的可溶性糖含量，最终导致环剥点上部的树干表面CO₂通量及其温度敏感性上升，而环剥点下部的树干表面CO₂通量及其温度敏感性下降。毛白杨树干表面CO₂通量及其温度敏感性对环剥的响应在不同季节（生长季和非生长季）存在明显差异。

关键词: 光合产物供应, 树干呼吸, 树干温度, 可溶性糖, 人工林

Abstract: [Objective] This study aimed to investigate the mechanism of photosynthate supply on stem CO₂ efflux and its temperature sensitivity of tree trunk surface, which is not only critical for understanding the carbon cycling processes of forest ecosystem, but also provides theoretical basis for forest and plantation management under global climate change.[Method] In this study, 10-year-old Populus tomentosa plantation was taken as the research object, and a random block experiment was conducted with three plots (30 m×30 m)in Chinese white poplar (P. tomentosa) plantation in northern China. A girdling experiment on the tree stems was operated to change the supply of photosynthate. The stem CO₂ efflux (E_s) and stem temperature (T_stem) of Chinese white poplar were measured to examine the effects of photosynthates supply on the temperature sensitivity (Q₁₀) of E_s above girdle (AG) and below girdle (BG). Meanwhile, the dynamic changes of nonstructural carbohydrates in stem tissue were measured for comparing different responses of E_s and Q₁₀ to substrate supply in growing and non-growing seasons.[Result] 1) E_s of AG was increased by 57% and E_s of BG was decreased by 43% in growing season after the 30-day girdling treatment, whereas no obvious difference in E_s was detected among NG, AG, and BG in non-growing season. 2) Soluble sugar contents of the AG and BG in growing season were decreased by 29% and 15%, respectively. Similarly, the soluble sugar content of AG was also decreased by 15%, but the soluble sugar content of BG was increased by 10% in non-growing season. 3) We also found exponential relationships between E_s and stem temperature in both growing and non-growing seasons, but the R squares (R²) of the exponential relationship between T_stem and E_s at AG and BG were decreased under stem girdling treatment. 4) Both the Q₁₀ and stem basal respiration rate (R₁₅) at AG were increased, while those of BG were decreased under stem girdling treatment.[Conclusion] Stem girdling blocked the import of photosynthates, and thus altered the soluble sugar contents of AG and BG. Stem girdling resulted in increases in the E_s and Q₁₀ at AG, but led to decreases in the E_s and Q₁₀ at BG. The responses of stem CO₂ efflux and its temperature sensitivity to stem girdling were obviously different between growing season and non-growing season.

Key words: Photosynthates supply, stem respiration, stem temperature, soluble sugar, plantation

中图分类号:

S718.43

张茜茜, 杨庆朋, 刘亮, 王清涛, 李菲, 郭丽丽, 郝立华, 曹旭, 范晓懂, 梁伟佳, 郑云普. 环剥对毛白杨树干表面CO₂通量及其温度敏感性的影响[J]. 林业科学, 2019, 55(5): 1-10.

Zhang Xixi, Yang Qingpeng, Liu Liang, Wang Qingtao, Li Fei, Guo Lili, Hao Lihua, Cao Xu, Fan Xiaodong, Liang Weijia, Zheng Yunpu. Effects of Girdling on Stem CO₂ Efflux and Its Temperature Sensitivity of Populus tomentosa[J]. Scientia Silvae Sinicae, 2019, 55(5): 1-10.

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环剥对毛白杨树干表面CO₂通量及其温度敏感性的影响

Effects of Girdling on Stem CO₂ Efflux and Its Temperature Sensitivity of Populus tomentosa

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