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

Abstract

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

CLC Number:

S859.84

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

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

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