西北干旱区绿洲葡萄园净碳交换及其影响因素

doi:10.13866/j.azr.2021.03.25

Abstract

Abstract:

Studying carbon budget dynamics and the formation mechanism of carbon sources and sinks in the oasis’s agricultural ecosystem in China’s northwest arid region are crucial. Carbon oxide (CO₂) fluxes were measured from May to October during the growing season of the arid oasis vineyard in Dunhuang using the eddy covariance system. Based on the CO₂ fluxes and data of relevant environmental factors, carbon exchange cumulative values, the net ecosystem exchange (NEE) dynamics, response to leaf area index (LAI), photosynthetically active radiation (PAR), water vapor deficiency (VPD), and air temperature (T_a) in the vineyard were estimated. Results obtained showed that during the growing season, the total cumulative amount of net ecosystem exchange (NEE), ecosystem respiration (R_e), and gross primary productivity (GPP) were -647.3, 883.2, and 1530.5 g C·m^-2, respectively. R_e/GPP value was 57.7%, indicating a slightly lower carbon consumption intensity and an intense carbon sink process. During the growing season, NEE showed a single peak change and peaked in July; this is similar to the seasonal variation in air temperature. This indicated that air temperature significantly affected NEE under the primary conditions of sufficient water supply. During the growing season, NEE was affected by biophysical factors such as LAI, PAR, VPD, and T_a. PAR was the most relevant environmental factor, increasing carbon sequestration by driving the photosynthesis of vines. LAI increased initially and then decreased during the growing season, causing the photosynthetic carbon sequestration to be affected accordingly; NEE also decreased initially and then increased. Keeping VPD in a suitable range (20-35 hPa) could effectively improve the carbon sequestration capacity of vines.

Key words: the vineyard of oasis, eddy covariance system, net ecosystem exchange, influencing factors

ZHANG Yang,ZHU Gaofeng,QIN Wenhua,ZHAO Nan,CHEN Huiling. Net carbon exchange and its influencing factors of the oasis vineyard in China’s northwest arid region[J].Arid Zone Research, 2021, 38(3): 833-842.

Figures/Tables 10

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月份	PAR	T_a	VPD	RH	SWC	n
5	-0.566^**	-0.210^**	-0.222^**	0.176^**	-0.006	881
6	-0.595^**	-0.222^**	-0.112^**	0.078^*	-0.135^**	865
7	-0.647^**	-0.282^**	-0.236^**	0.183^**	0.025	833
8	-0.773^**	-0.329^**	-0.248^**	0.225^**	0.081^*	844
9	-0.728^**	-0.329^**	-0.318^**	0.309^**	-0.170^**	741
10	-0.364^**	-0.407^**	-0.249^**	-0.154^**	0.275^**	689
5—10	-0.619^**	-0.035^*	-0.042^**	-0.022	-0.066^**	4909

月份	最大光合速率A_max /(μmol·m^-2·s^-1)	白天生态系统呼吸R_e,d /(μmol·m^-2·s^-1)	初始光能利用率α /(μmol·μmol^-1)	样本数	R²
5	13.01	4.03	0.051	770	0.27
6	27.19	6.32	0.119	663	0.39
7	27.54	7.65	0.170	746	0.40
8	30.58	5.62	0.066	763	0.54
9	20.64	5.24	0.104	644	0.44
10	7.91	3.18	0.057	598	0.13

月份	指数方程	Q₁₀	R²
5	y=0.389e^0.127^x	3.6	0.41
6	y=1.103e^0.072^x	2.1	0.36
7	y=1.177e^0.077^x	2.2	0.66
8	y=0.625e^0.092^x	2.5	0.35
9	y=0.610e^0.125^x	3.5	0.72
10	y=0.843e^0.119^x	3.3	0.66

Net carbon exchange and its influencing factors of the oasis vineyard in China’s northwest arid region

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