辽河三角洲芦苇湿地碳通量特征及空间代表性

doi:10.3969/j.issn.1673-503X.2023.05.009

气象与环境学报 ›› 2023, Vol. 39 ›› Issue (5): 72-81.doi: 10.3969/j.issn.1673-503X.2023.05.009

辽河三角洲芦苇湿地碳通量特征及空间代表性

吴琼^1,^2,³(),温日红¹,贾庆宇^1,^3,^4,^5,*(),张大为²,赵一俊²,于文颖^1,^4,⁵,刘宪哲^2,³,王楠^2,³

1. 中国气象局沈阳大气环境研究所, 辽宁沈阳 110166
2. 盘锦市气象局, 辽宁盘锦 124000
3. 盘锦国家气候观象台, 辽宁盘锦 124000
4. 辽宁省农业气象灾害重点实验室, 辽宁沈阳 110166
5. 辽宁省黑土地演化与生态效应重点实验室, 辽宁沈阳 1100346

收稿日期:2022-05-11 出版日期:2023-10-28 发布日期:2023-11-28
通讯作者: 贾庆宇 E-mail:459033682@qq.com;beyond.22@126.com
作者简介:吴琼, 女, 1988年生, 工程师, 主要从事陆面过程与全球变化研究, E-mail: 459033682@qq.com
基金资助:
科技部科技基础资源调查项目(2019FY0101302);国家重点研发计划专项(2022YFF0801301);国家自然科学基金项目(42141016);辽宁省气象局博士启动项目(D202002);基本科研业务费项目(2020SYIAEZD2)

Characteristics and spatial representativeness of carbon flux of Phragmites communis wetland in the Liaohe River Delta, China

Qiong WU^1,^2,³(),Rihong WEN¹,Qingyu JIA^1,^3,^4,^5,*(),Dawei ZHANG²,Yijun ZHAO²,Wenying YU^1,^4,⁵,Xianzhe LIU^2,³,Nan WANG^2,³

1. Institute of Atmospheric Environment, China Meteorological Administration, Shenyang 110166, China
2. Panjin Meteorological Service, Panjin 124000, China
3. Panjin National Climate Observatory, Panjin 124000, China
4. Key Laboratory of Agrometeorological Disasters, Liaoning Province, Shenyang 110166, China
5. Key Laboratory of Block Soil Evolution and Ecological Effects, Liaoning Province, Shenyang 110166, China

Received:2022-05-11 Online:2023-10-28 Published:2023-11-28
Contact: Qingyu JIA E-mail:459033682@qq.com;beyond.22@126.com

摘要/Abstract

摘要：

基于2019—2020年辽河三角洲碳通量观测数据, 分析了辽河三角洲芦苇湿地碳通量的时间变化特征, 采用Kljun模型进一步分析了碳通量的空间代表性。结果表明: 受短波辐射和气温的周期变化影响, 2019年芦苇湿地对碳的净吸收周期为156 d, NEE峰值出现在7月中上旬, 为-40.59 μmol·m^-2 s^-1, 固碳量显著高于2020年, 达到0.561 kgC·m^-2。2020年的净吸收周期为131 d, NEE峰值出现在6月中旬, 为-41.39 μmol·m^-2·s^-1, 比2019年提前, 生长季夜间呼吸作用较强, 导致固碳量较低; 碳通量在春季和夏季呈明显的U型日变化, 秋冬季碳通量变化较平稳。2019年和2020年夏季的日平均最大值分别为-16.86 μmol·m^-2·s^-1和-13.61 μmol·m^-2·s^-1, 2020年最大值出现在11:00, 比2019年提前; 主导风向和不稳定层结状态90%最远距离贡献点的分布区域均在0°~90°和180°~270°方向。通量源区80%的上风平均距离最远为120 m, 通量贡献峰值在距离通量塔10 m的位置。源区范围随着大气稳定度的增加也逐渐扩大, 主风向70%的通量贡献范围内是芦苇植被; 在源区范围内, 芦苇提供了76.20%的碳通量信息, 水体提供了17.82%的通量信息, 通量观测数据在夏季白天属于代表性级别, 全年属于可接受级别。研究有助于了解辽河三角洲湿地生态系统在碳循环和减排中的能力和作用。

关键词: Kljun模型, 碳通量源区, 空间代表性

Abstract:

Based on observation data of carbon fluxes in the Liaohe River Delta from 2019 to 2020, the temporal change features of carbon fluxes in Phragmites communis wetlands in the Liaohe River Delta were analyzed and spatial representativeness of carbon fluxes was further investigated using the Kljun model.Results show that the net absorption cycle of Phragmites communis wetlands was 156 d under the influence of periodic changes in air temperature and shortwave radiation in 2019, the NEE peak value of -40.59 μmol·m^-2 s^-1 appeared in the first and middle ten-day of July, and carbon sequestration of 0.561 kgC·m^-2 was higher than that in 2020.In 2020, the net absorption cycle was 131 d, and the NEE peak value of -41.39 μmol·m^-2 s^-1 appeared in mid-June, which was earlier than in 2019.The lower carbon sequestration ability was caused by stronger respiration at night during the growing season.Carbon fluxes showed an obvious "U-shaped" diurnal variation in spring and summer and varied stable in autumn and winter.The maximum daily average carbon fluxes in summers were -16.86 μmol·m^-2 s^-1 in 2019 and -13.61 μmol·m^-2 s^-1 in 2020, and appeared at 11:00 in 2020, which was earlier than in 2019.In addition, the distribution areas of the prevailing wind direction and the farthest distance contribution point of 90% of the unstable stratification status were in the direction of 0°~90° and the direction of 180°~270°.The average windward distance of 80% of the flux source region was 120 m at the farthest, while the flux contribution peak value appeared at 10 m far from the flux tower.The range of the source region expanded gradually with the increase in atmospheric stability, and that of 70% in the prevailing wind direction was distributed with reed vegetation providing 76.20% of carbon flux information, while the water body contributed 17.82% of carbon flux information.Flux observation data were at the representative level in the daytime of summer and an acceptable level all year round.The research helps to know the capacity and role of the wetlands ecosystem in the Liaohe River Delta in carbon cycling and carbon emission reduction.

Key words: Kljun model, Flux source area, Space representation

中图分类号:

S859.84

吴琼,温日红,贾庆宇,张大为,赵一俊,于文颖,刘宪哲,王楠. 辽河三角洲芦苇湿地碳通量特征及空间代表性[J]. 气象与环境学报, 2023, 39(5): 72-81.

Qiong WU,Rihong WEN,Qingyu JIA,Dawei ZHANG,Yijun ZHAO,Wenying YU,Xianzhe LIU,Nan WANG. Characteristics and spatial representativeness of carbon flux of Phragmites communis wetland in the Liaohe River Delta, China[J]. Journal of Meteorology and Environment, 2023, 39(5): 72-81.

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大气层结^[52]	风向/°	最大风速/(m·s^-1)	平均风速/(m·s^-1)	风向频率/(%)
(Z-d)/L>0稳定层结	0~90	10.90	3.24	24.95
	90~180	4.77	1.27	9.86
	180~270	11.12	3.97	49.77
	270~360	7.54	1.92	15.40
(Z-d)/L < 0不稳定层结	0~90	10.73	2.23	31.67
	90~180	4.87	1.2	7.24
	180~270	9.67	2.78	44.75
	270~360	7.33	1.38	16.31

区域	春季		夏季		秋季		冬季
区域	白天	夜晚	白天	夜晚	白天	夜晚	白天	夜晚
芦苇区域	79.42	81.77	80.29	74.72	70.56	66.39	73.83	72.41
水体区域	15.53	12.31	14.69	18.57	23.13	25.85	20.61	20.66
合计	94.95	94.08	94.98	93.29	93.69	92.24	94.44	93.07

辽河三角洲芦苇湿地碳通量特征及空间代表性

Characteristics and spatial representativeness of carbon flux of Phragmites communis wetland in the Liaohe River Delta, China

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