Effects of groundwater level on soil respiration in oasis wetlands

doi:10.7522/j.issn.1000-694X.2025.00327

Journal of Desert Research ›› 2026, Vol. 46 ›› Issue (1): 273-281.DOI: 10.7522/j.issn.1000-694X.2025.00327

Effects of groundwater level on soil respiration in oasis wetlands

Yangyang Meng¹^,²(), Zhibin He²(), Bing Liu², Longfei Chen², Quanyan Tian², Lisha Wang²^,³

^1.College of Forestry，Henan Agricultural University，Zhengzhou 450046，China
^2.Linze Inland River Basin Research Station，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^3.College of Resources，Environment and Tourism，Hubei University of Arts and Sciences，Xiangyang 441053，Hubei，China

Received:2025-11-23 Revised:2025-12-23 Online:2026-01-20 Published:2026-03-09
Contact: Zhibin He

Abstract

Abstract:

Exploring the impact mechanism of soil respiration in oasis wetlands under different water level gradients is of great significance for regulating carbon cycling processes and evaluating ecological functions in fragile wetlands. This study takes typical oasis wetlands in the middle reaches of the Heihe River as the research object， setting up three water level gradient zones of high， medium， and low， exploring the dynamic changes in soil respiration rate during the growing season， and analyzing the impact mechanism of soil properties and plant characteristics on soil respiration rate under different water level gradients. The results showed that：（1） The trend of soil respiration rate changes under different water level gradients during the growing season was similar， with the highest in summer and the lowest in spring. （2） With the increase of groundwater level， wetland soil respiration rate， soil microbial biomass carbon， water content， total nitrogen and organic carbon， plant biomass， richness and diversity all significantly increase， soil conductivity significantly decreases， and soil temperature differences between different water level zones are small. （3） The soil respiration in both high and medium water level zones is mainly influenced by soil microbial biomass carbon and temperature， which can explain 79.9% and 80.8% of the variation in soil respiration in the two water level zones， respectively； The low water level zone is mainly influenced by soil microbial biomass carbon and salinity， which can explain 76.8% of the variation in soil respiration. In summary， changes in groundwater levels can alter soil and plant characteristics， thereby affecting soil respiration rates in oasis wetlands.

Key words: water level gradient, soil respiration rate, dynamic changes, impact mechanism, oasis wetland

CLC Number:

S154

Yangyang Meng, Zhibin He, Bing Liu, Longfei Chen, Quanyan Tian, Lisha Wang. Effects of groundwater level on soil respiration in oasis wetlands[J]. Journal of Desert Research, 2026, 46(1): 273-281.

Figures/Tables 7

References 35

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土壤指标属性	水位梯度带
土壤指标属性	土壤指标	WL-H	WL-M	WL-L
微生物量	土壤微生物量碳/(mg·kg^-1)	178.03±28.21^a	138.68±15.56^b	125.02±13.73^c
物理	土壤含水量/%	27.12±0.72^a	22.45±0.43^b	18.42±0.3^c
	土壤温度/℃	18.43±0.49^b	18.56±0.3^b	19.39±0.28^a
	电导率/(mS·cm^-1)	2.52±0.27^c	4.72±0.21^b	7.04±0.26^a
	砂粒/%	23.24±4.78^b	26.91±3.21^b	42.34±2.2^a
	粉粒/%	67.61±3.73^a	64.73±5.23^a	51.77±2.83^b
	黏粒/%	9.15±1.42^a	8.36±0.64^a	5.88±0.52^b
化学	全氮/(g·kg^-1)	0.72±0.08^a	0.64±0.1^ab	0.53±0.08^b
化学	有机碳/(g·kg^-1)	8.31±0.69^a	7.45±1^ab	6.21±0.66^b

土壤指标属性	水位梯度带
土壤指标属性	土壤指标	WL-H	WL-M	WL-L
微生物量	土壤微生物量碳/(mg·kg^-1)	178.03±28.21^a	138.68±15.56^b	125.02±13.73^c
物理	土壤含水量/%	27.12±0.72^a	22.45±0.43^b	18.42±0.3^c
	土壤温度/℃	18.43±0.49^b	18.56±0.3^b	19.39±0.28^a
	电导率/(mS·cm^-1)	2.52±0.27^c	4.72±0.21^b	7.04±0.26^a
	砂粒/%	23.24±4.78^b	26.91±3.21^b	42.34±2.2^a
	粉粒/%	67.61±3.73^a	64.73±5.23^a	51.77±2.83^b
	黏粒/%	9.15±1.42^a	8.36±0.64^a	5.88±0.52^b
化学	全氮/(g·kg^-1)	0.72±0.08^a	0.64±0.1^ab	0.53±0.08^b
化学	有机碳/(g·kg^-1)	8.31±0.69^a	7.45±1^ab	6.21±0.66^b

水位梯度带	平均高度/cm	平均盖度/%	地上生物量/(g·m^-2)	地下生物量/(g·m^-2)
WL-H	54.67±2.45^a	78.06±4.67^a	297.28±29.9^a	674.33±93.48^a
WL-M	28.39±3.69^ab	71.38±3.28^b	232.87±21.06^b	451.67±46.34^ab
WL-L	17.28±3.64^b	45.33±5.67^c	156.62±22.25^c	347.21±73.67^b

水位梯度带	平均高度/cm	平均盖度/%	地上生物量/(g·m^-2)	地下生物量/(g·m^-2)
WL-H	54.67±2.45^a	78.06±4.67^a	297.28±29.9^a	674.33±93.48^a
WL-M	28.39±3.69^ab	71.38±3.28^b	232.87±21.06^b	451.67±46.34^ab
WL-L	17.28±3.64^b	45.33±5.67^c	156.62±22.25^c	347.21±73.67^b

水位梯度带	Margalef指数	Shannon-Wiener指数	优势种	伴生种
WL-H	1.054	0.826	羊草	苣荬菜，木贼，酸模，狗牙根，草木犀，蓟
WL-M	0.659	0.810	羊草	狗牙根，草木犀，蓟
WL-L	0.509	0.670	羊草	狗牙根，苣荬菜

Effects of groundwater level on soil respiration in oasis wetlands

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水位梯度带	顺序	进入因子	相关系数	回归方程	P值
WL-H	1	土壤微生物量碳	0.718	Y=0.021SMBC+1.067	<0.001
	2	土壤温度	0.799	Y=0.017SMBC+0.101ST-0.003	<0.001
WL-M	1	土壤微生物量碳	0.725	Y=0.02SMBC+1.356	<0.001
	2	土壤温度	0.808	Y=0.017SMBC+0.082ST+0.322	<0.001
WL-L	1	土壤微生物量碳	0.735	Y=0.009SMBC+0.766	<0.001
	2	土壤电导率	0.768	Y=0.008SMBC-0.034EC+1.594	<0.001

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