降水梯度对青海湖河源湿地温室气体排放日变化的影响

doi:10.13866/j.azr.2022.03.09

Abstract

Abstract:

Moisture is the main limiting factor affecting the growth and development of alpine ecosystems. To explore effects of different water conditions on characteristics of greenhouse gas emissions from wetlands, wetlands at the source of the Wayan Mountain in Qinghai Lake Basin were selected. Box-gas chromatography monitored 24-hour greenhouse gas emission characteristics of wetlands and explored effects of control treatment (CK), +25% (precipitation increase 25% treatment), -25% (reduction in the daily change trend of carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O) under conditions of 25% rain treatment), +75% (precipitation increaseo of 75% treatment), and -75% (precipitation reduction of 75% treatment). The results showed that: (1) CO₂ emission ranged from 47.52 to 123.71 mg·m^-2·h^-1, CH₄ flux ranged from -8.50 to 6.74 µg·m^-2·h^-1, and N₂O flux ranged from -15.82 to 6.90 µg·m^-2·h^-1. (2) The diurnal variation of CO₂, CH₄ and N₂O in CK, +25% and +75% treatments showed emission status, and the diurnal variation of CO₂ in -25% treatment showed emission status, while CH₄ and N₂O showed absorption status; The diurnal changes of CO₂ and N₂O under -75% treatment were emission state, while CH₄ was absorption state, and there were significant differences among different precipitation treatments (P<0.05). (3) CO₂ had a significant positive correlation with soil temperature (P<0.05) and a significant negative correlation with soil moisture (P<0.05); There was a significant negative correlation between CH₄ and soil temperature (P<0.05) and between CH₄ and soil moisture (P<0.05); There was a positive correlation between N₂O and soil temperature (P<0.05), while there was a negative correlation between N₂O and soil moisture in CK treatment and a positive correlation in rain reduction treatment (P<0.05), and there was no obvious regularity. (4) Small succession of plant communities occurred under different water treatments. The balance of soil moisture and temperature has a significant impact on the greenhouse gas emission flux in this area, and the imbalance should be avoided to lead to the increase of greenhouse gas emissions.

Key words: greenhouse gas, static chamber-gas chromatography, source-sink effect, soil moisture, precipitation simulation, Qinghai Lake

YANG Ziwei,CHE Zihan,LIU Fumei,CHEN Kelong. Precipitation gradient influence on daily greenhouse gas emission fluxes from a Qinghai Lake wetland[J].Arid Zone Research, 2022, 39(3): 754-766.

Figures/Tables 13

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	处理	7:00	11:00	15:00	19:00	23:00	3:00
土壤温度/℃	CK	3.06±0.49b	5.10±0.36b	8.73±1.02a	8.23±0.60a	7.56±0.30c	6.26±0.37d
	+25%	3.13±0.34b	4.53±0.11b	8.43±0.11a	8.13±1.04a	6.96±0.34c	6.30±0.43d
	-25%	2.60±1.40c	5.40±0.72b	9.33±1.15a	9.23±0.45a	7.23±0.32cd	6.46±0.32d
	+75%	2.43±1.10bc	5.66±0.85b	8.63±2.03a	8.46±0.76a	7.06±0.55cd	6.16±0.15d
	-75%	3.03±0.76b	6.56±0.20b	9.23±1.01a	8.73±0.40a	6.93±0.85c	6.66±0.77c
土壤水分/%	CK	35.63±1.09c	33.36±1.09d	34.00±1.58d	34.73±0.50c	48.56±0.37b	55.66±2.50a
	+25%	37.40±0.65b	33.16±0.32c	35.63±2.74bc	34.43±0.58bc	56.70±2.52a	56.06±3.85a
	-25%	36.53±0.83c	31.10±0.95d	33.63±1.20cd	32.60±1.25d	42.80±2.04b	54.00±3.00a
	+75%	36.23±0.80bc	32.13±1.95c	37.50±3.67b	34.13±0.30bc	55.50±1.45a	54.90±5.16a
	-75%	35.53±0.89b	30.86±0.98b	32.73±0.55b	31.83±2.05b	54.73±3.78a	53.13±7.10a

	处理	7:00	11:00	15:00	19:00	23:00	3:00
土壤温度/℃	CK	2.43±0.08e	4.53±0.14d	8.96±0.27a	7.23±0.24b	7.40±0.05b	5.90±0.05c
	+25%	2.20±0.15c	5.96±0.27b	7.93±0.38a	5.43±0.34b	5.53±0.18b	4.96±0.17b
	-25%	2.83±0.08d	6.20±0.15b	8.63±0.26a	6.56±0.31b	6.80±0.11b	5.43±0.06c
	+75%	2.10±0.15c	5.43±0.80b	8.10±0.52a	6.30±0.81b	6.10±0.35b	5.33±0.20b
	-75%	2.26±0.08d	5.46±0.82c	8.53±0.12a	7.40±0.30ab	6.86±0.12b	5.43±0.23c
土壤水分/%	CK	56.90±1.03b	56.50±0.49b	56.56±0.84b	63.10±1.31a	58.20±0.55b	65.10±0.91a
	+25%	57.00±1.49a	56.76±1.03a	57.30±1.27a	62.13±0.82a	62.13±1.06a	61.16±2.68a
	-25%	52.06±0.67c	55.23±1.31bc	56.36±1.04bc	59.63±0.90ab	61.83±1.34a	60.40±1.85ab
	+75%	55.10±0.72b	57.73±1.38b	59.8±2.65b	65.13±1.27ab	65.26±2.19a	64.53±0.89a
	-75%	53.33±0.06a	55.76±1.06a	58.10±0.32a	59.03±0.78a	57.53±1.21a	59.83±4.52a

处理	pH		EC
处理	0~10 cm	10~20 cm	0~10 cm	10~20 cm
CK	6.700±0.070	6.673±0.078	178.300±2.400	143.600±3.300
+25%	6.233±0.503	6.883±0.513	252.997±3.105	89.200±1.600
-25%	6.267±0.481	5.950±0.563	208.000±2.100	134.733±2.964
+75%	6.050±1.020	6.550±0.910	383.000±1.960	150.500±3.160
-75%	6.300±0.510	7.000±0.630	334.000±2.150	90.800±1.960

时间	处理	植被优势种	植被盖度/%	植被高度/cm	植被表层厚度/cm
2020年8月	CK	藏嵩草、薹草、火绒草	84	5.4~12.6	0.21
	+25%	藏嵩草、薹草、鹅绒委陵菜、火绒草	92	6.3~17.4	0.16
	-25%	藏嵩草、薹草、平车前	82	4.9~15.3	0.28
	+75%	藏嵩草、薹草、火绒草、乳白香青	90	7.1~17.8	0.37
	-75%	藏嵩草、薹草、鹅绒委陵菜、蓝石草	80	0.9~13.7	0.23
2021年8月	CK	藏嵩草、薹草、火绒草	85	5.6~11.8	0.23
	+25%	藏嵩草、薹草、鹅绒委陵菜、火绒草	93	7.4~17.5	0.31
	-25%	藏嵩草、薹草、平车前	81	5.2~13.6	0.25
	+75%	藏嵩草、薹草、火绒草、乳白香青	87	8.2~16.8	0.28
	-75%	藏嵩草、薹草、鹅绒委陵菜、蓝石草、伏毛山莓草	80	2.6~10.6	0.19

Precipitation gradient influence on daily greenhouse gas emission fluxes from a Qinghai Lake wetland

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[5]	SHI Jianzhou, LIU Xiande, TIAN Qing, YU Pengtao, WANG Yanhui. Rainfall response of soil water content on a slope of Larix principis-rupprechtii plantation in the semi-arid Liupan Mountains [J]. Arid Zone Research, 2023, 40(4): 594-604.
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