Soil respiration and its components across different land use types in the Dongtan reclamation area of Chongming Island

doi:10.3969/j.issn.1000-5641.2022.03.008

Abstract

Abstract:

In the Chongming Dongtan reclamation area, the soil carbon flux observation system (LI-8100A) and root removal method were used to continuously measure soil respiration (R_S), heterotrophic respiration (R_H), and autotrophic respiration (R_A) of five land use types (Phragmites australis wetland, Imperata cylindrica wetland, young forest, middle-age forest, and cropland); the methods were also used to measure the soil temperature, volumetric water content, electrical conductivity, and other environmental factors in the 0-10 cm soil layer. In this study, the differences in soil respiration and its components among different land use types in the Chongming Dongtan reclamation area were systematically compared. The results showed that: ① R_S in the young forest, middle-age forest, and cropland plot were significantly lower than those in the P. australis wetland and the I. cylindrica wetland plot; ② the proportion of R_H found in the young forest, middle-age forest, and cropland was significantly higher than that observed in the P. australis wetland and the I. cylindrica wetland; ③ R_S and its components showed a significant exponential relationship with soil temperature, but showed weak correlations with the soil volumetric water content and electrical conductivity. Compared with the residual wetlands, the different agroforestry utilization methods significantly reduced R_S, but significantly increased R_H, which may suggest that the soil organic carbon pool is still in a state of net loss after 20 years of reclamation. Thus, effective measures should be taken to improve the carbon sequestration capacity of the reclaimed soil in this area.

Key words: soil respiration, soil respiration components, coastal land reclamation, land use types

CLC Number:

Q148

Jing HE, Qicheng ZHONG, Guilian ZHANG, Kaiyun WANG, Yueqi WU, Guishu HE, Dezhi LI, Nana PENG. Soil respiration and its components across different land use types in the Dongtan reclamation area of Chongming Island[J]. Journal of East China Normal University(Natural Science), 2022, 2022(3): 71-81.

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土地利用类型	缩写	主要物种	平均冠层高度/m	平均胸径/cm	郁闭度	管理措施	占比/%
芦苇湿地	PW	芦苇	1.5			无耕作	22.7
白茅湿地	IW	白茅、芦苇	芦苇: 0.8 白茅: 0.7			无耕作	27.0
幼林龄	YF	无患子、朴树; 10月—次年3月花菜	无患子: 4.7 朴树: 7.4 花菜: 0.4	无患子: 4.3 朴树: 11.9	0.7	驱虫、除草	8.6
中林龄	MF	夹竹桃、杉木、朴树	夹竹桃: 1.9 杉木: 11.0 朴树: 9.3	杉木: 16.3 朴树: 16.0	0.8	施肥	7.9
农田	CP	10月—次年3月花菜, 4月—次年9月玉米	花菜: 0.4 玉米: 2.0			播种、施肥、除草、驱虫	33.8

土地利用类型	全氮 /%	全碳 /%	土壤容重 / (g·cm^–3)	土壤体积含水率/%
PW	0.06±0.01	1.30±0.06	1.52±0.07	53.50±4.00
IW	0.06±0.01	1.40±0.05	1.36±0.15	43.60±0.46
YF	0.07±0.02	1.40±0.10	1.44±0.13	29.40±1.10
MF	0.06±0.02	1.40±0.24	1.37±0.11	18.80±1.72
CP	0.07±0.01	1.50±0.08	1.52±0.01	32.20±3.00

变异来源	土壤呼吸速率			土壤异养呼吸速率			土壤自养呼吸速率
变异来源	df	F	p	df	F	p	df	F	p
用地类型	4	9.61	<0.01	4	28.94	<0.01	4	95.91	<0.01
时间	12	208.51	<0.01	12	160.83	<0.01	12	47.98	<0.01
用地类型 × 时间	48	9.32	<0.01	48	20.93	<0.01	48	14.15	<0.01

土地利用类型	土壤呼吸速率			土壤异养呼吸速率			土壤自养呼吸速率
土地利用类型	T	W	E	T	W	E	T	W	E
PW	0.903**	0.004	–0.484**	0.288	–0.289	0.112	0.919**	0.152	–0.570**
IW	0.535**	–0.159	0.144	0.395*	–0.045	0.041	0.424**	–0.207	0.082
YF	0.838**	0.137	–0.035	0.840**	0.208	0.050	0.526**	0.038	–0.029
MF	0.865**	0.484**	–0.542**	0.875**	0.469**	–0.204	0.496**	0.434**	–0.111
CP	0.419**	–0.142	0.086	0.502**	–0.201	0.052	–0.103	–0.111	0.208

土地利用类型	土壤呼吸速率		土壤异养呼吸速率		土壤自养呼吸速率
土地利用类型	方程	R²	方程	R²	方程	R²
PW	lny = 0.114T – 0.633	0.85	lny = 0.042T – 0.372	0.28	lny = 0.178T – 0.048W – 0.403	0.80
IW	lny = 0.087T – 0.065	0.73	lny = 0.112T – 1.919	0.56	lny = 0.081T – 0.535	0.36
YF	lny = 0.074T – 0.022W + 0.516	0.81	lny = 0.093T – 0.053W + 0.371	0.73	lny = 0.054T – 0.887	0.37
MF	lny = 0.108T + 0.027W – 1.1	0.87	lny = 0.108T – 0.951	0.83
CP	lny = 0.041T + 0.705	0.31	lny = 0.053T + 0.02	0.38