洪泽湖河湖交汇区典型杨树人工林碳通量月尺度变化特征

doi:10.12302/j.issn.1000-2006.202012047

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南京林业大学学报（自然科学版） ›› 2022, Vol. 46 ›› Issue (2): 19-26.doi: 10.12302/j.issn.1000-2006.202012047

所属专题： “双碳”视域下的生态系统固碳增汇

• 专题报道Ⅰ："双碳"视域下的生态系统固碳增汇（执行主编阮宏华李萍萍） • 上一篇下一篇

洪泽湖河湖交汇区典型杨树人工林碳通量月尺度变化特征

崔皓¹(), 韩建刚¹^,²^,³, 郭俨辉¹, 季淮¹, 朱咏莉¹^,²^,^*(), 李萍萍¹^,²^,³

1.南京林业大学生物与环境学院,江苏南京 210037
2.南京林业大学南方现代林业协同创新中心,江苏南京 210037
3.江苏洪泽湖湿地生态系统国家定位观测研究站,江苏洪泽 223100

收稿日期:2020-12-29 接受日期:2021-09-01 出版日期:2022-03-30 发布日期:2022-04-08
通讯作者: 朱咏莉
基金资助:
林业科技成果国家级推广项目([2016]37号)

Monthly scale variation characteristics of net ecosystem exchange (NEE) in poplar plantations at the confluence of Hongze Lake and Huai River

CUI Hao¹(), HAN Jiangang¹^,²^,³, GUO Yanhui¹, JI Huai¹, ZHU Yongli¹^,²^,^*(), LI Pingping¹^,²^,³

1. College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
2. Co-Innovation Center for the Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China
3. National Positioning Observation Station of Hongze Lake Wetland Ecosystem in Jiangsu Province, Hongze 223100, China

Received:2020-12-29 Accepted:2021-09-01 Online:2022-03-30 Published:2022-04-08
Contact: ZHU Yongli

摘要/Abstract

摘要：

【目的】揭示洪泽湖水位夏低冬高的独特水文特点对河湖交汇区杨树人工林净生态系统碳交换(NEE,简称碳通量)产生的影响。【方法】采用涡度相关及土壤水热监测系统,对洪泽湖湿地河湖交汇区典型杨树人工林碳通量及其环境因子进行了连续3 a(2016—2018年)的观测,分析月尺度上碳通量变化及其与环境因子的关系。【结果】①洪泽湖河湖交汇区杨树人工林的NEE值具有明显“V”形变化曲线,白天表现为碳吸收,夜间表现为碳释放,日均碳汇时间为10 h;②研究期间各旬NEE值在2018年的2月上旬最高(7.117 g/m²),最低值出现在2017年的7月中旬(-212.256 g/m²);3年间年均NEE值为-1 413.403 g/m²;③在洪泽湖开闸时期(5—8月)水位低,土壤含水率和风速是影响NEE的主要因素,关闸时期(9月至翌年4月)水位高,NEE主要受空气温度和饱和水汽压差影响。【结论】夏季对洪泽湖开闸放水,有利于河湖交汇区杨树生长及碳汇增加,冬季蓄水地下水位抬高,对杨树生长产生的不利影响可以通过开沟筑垄来消除,进而有利于区域杨树人工林全年碳汇功能的提升。

关键词: 杨树人工林, 碳通量, 涡度相关, 环境因子, 洪泽湖

Abstract:

【Objective】The aim of this study was to reveal the impact of the unique hydrological characteristics of Hongze Lake, which has a low water level in summer and a high water level in winter, on the net ecosystem exchange carbon flux (NEE) of poplar plantations at the confluence of Hongze Lake and Huai River. 【Method】In this study, eddy covariance and soil moisture monitoring systems were used to observe the NEE and environmental factors of typical poplar plantations in the river-lake intersection area for three consecutive years(2016-2018) to analyze the variations in NEE and its relationship with environmental factors on a monthly basis. 【Result】(1) The NEE values of the poplar plantations in this area displayed an obvious V-shaped curve, showing carbon absorption during the daytime and carbon release at night, with an average daily carbon sink time of 10 h. (2) The highest value of NEE during the annual 10 days study was 7.117 g/m² in early February 2018, and the lowest NEE was -212.256 g/m² in mid-July 2017. The average annual NEE value in the three years was -1 413.403 g/m². (3) The water level of Hongze Lake was low during the sluice-opening period (from May to August), and soil moisture content and wind speed were the main factors affecting NEE, whereas the water level was high during the sluice-closing period (September to April of the next year), and NEE was mainly affected by air temperature and saturated vapor pressure differences. 【Conclusion】Opening the sluices and releasing water in summer were advantageous for the growth of poplar trees and increased the carbon sink. In winter, the groundwater level increased, and the adverse effects on the poplar growth could be eliminated by the ditching and ridge construction, which would be beneficial for improving the annual carbon sink function of poplar plantations in this region.

Key words: poplar (Populus×euramericana‘Nanlin 95’) plantation, net ecosystem exchange (NEE), eddy covariance, environmental factor, Hongze Lake

中图分类号:

X826
S718

崔皓,韩建刚,郭俨辉,等. 洪泽湖河湖交汇区典型杨树人工林碳通量月尺度变化特征[J]. 南京林业大学学报（自然科学版）, 2022, 46(2): 19-26.

CUI Hao, HAN Jiangang, GUO Yanhui, JI Huai, ZHU Yongli, LI Pingping. Monthly scale variation characteristics of net ecosystem exchange (NEE) in poplar plantations at the confluence of Hongze Lake and Huai River[J].Journal of Nanjing Forestry University (Natural Science Edition), 2022, 46(2): 19-26.DOI: 10.12302/j.issn.1000-2006.202012047.

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月份 month	碳汇时间段 carbon sink time	碳汇时长/h carbon sink time	NEE最小值/ (mg·m^-2·s^-1) minimum NEE	最小值出现时间 corresponding moment
1	8:30—16:30	8.0	-0.063±0.137	11:30
2	8:00—17:30	9.5	-0.099±0.103	12:30
3	6:30—17:30	11.0	-0.186±0.164	12:00
4	6:30—17:30	11.0	-0.460±0.295	13:00
5	6:00—18:00	12.0	-0.617±0.270	11:30
6	6:30—18:00	11.5	-0.708±0.351	11:30
7	6:30—18:00	11.5	-0.742±0.341	12:30
8	7:00—17:30	10.5	-0.855±0.344	12:30
9	7:30—17:00	9.5	-0.598±0.257	12:30
10	8:00—16:00	8.0	-0.294±0.219	13:00
11	7:30—16:30	9.0	-0.131±0.063	12:30
12	7:30—16:00	8.5	-0.104±0.133	11:30

时间段 stage	回归方程 regression equation	R²	P	贡献率/%(因子) contribution rate (factor)
总时期period	c_NEE=-0.536R_n+12.141W_s+0.879G_HF + 81.532 c_SWC-48.303	0.794	<0.01	56.78 (R_n),24.44 (W_s), 10.10(G_HF),8.67 (c_SWC)
开闸期sluice opening period	c_NEE=844.475 c_SWC +46.885W_s-577.484	0.689	<0.01	51.70 (c_SWC),48.30 (W_s)
关闸期sluice closing period	c_NEE=-1.458T_a-35.099p_VPD+9.962	0.691	<0.01	59.42 (T_a),40.58(p_VPD)

洪泽湖河湖交汇区典型杨树人工林碳通量月尺度变化特征

Monthly scale variation characteristics of net ecosystem exchange (NEE) in poplar plantations at the confluence of Hongze Lake and Huai River

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