Responses of soil respiration to tropical forest secondary succession in Xishuangbanna

doi:10.12302/j.issn.1000-2006.202010044

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (2): 12-18.doi: 10.12302/j.issn.1000-2006.202010044

Special Issue: “双碳”视域下的生态系统固碳增汇

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Responses of soil respiration to tropical forest secondary succession in Xishuangbanna

ZHAO Shuang(), WANG Shaojun(), YANG Bo, ZUO Qianqian, CAO Qianbin, WANG Ping, ZHANG Lulu, ZHANG Kunfeng, FAN Yuxiang

College of Ecology and Environment, Southwest Forestry University, Kunming 650224,China

Received:2020-10-27 Accepted:2021-04-19 Online:2022-03-30 Published:2022-04-08
Contact: WANG Shaojun E-mail:zhaoshuang686883@163.com;shaojunwang2009@163.com

Abstract

Abstract:

【Objective】This study aimed to examine seasonal variations in soil respiration rates during secondary tropical forest succession, which could provide a reference basis for an accurate assessment of the effects of tropical forest restoration on soil carbon and nitrogen pool changes.【Method】The LI-6400-09 respiration chamber connected to a portable infrared gas analyzer was employed for continuous observation of soil respiration rates in Mallotus paniculatus and Syzygium oblatum communities. We also assessed the effects of changes in soil microbial biomass carbon, bulk density, pH, and concentrations of carbon and nitrogen pools on soil respiration rates using the statistical methods of correlation and principal component analyses. 【Result】There were significant seasonal variations in respiration rates in the two secondary forests. Soil respiration exhibited a similar fluctuation pattern, with a single peak occurring during the wet season (June). Soil respiration rates were significantly higher in the S. oblatum community[3.80~6.19 μmol/(m²·s)]than in the M. paniculatus community[2.40~4.35 μmol/(m²·s)]. However, the variations in soil respiration rates were significantly higher in the early restoration stage (1.81 times) than in the late restoration stage(1.63 times). Soil respiration rates increased nonlinearly with seasonal variations in soil temperature and water values (P<0.01, or P<0.05). The contributions of soil temperature (49.00%~65.30%) and water content (2.96%~53.00%) to soil respiration variations were higher in the S. oblatum community than in the M. paniculatus community (6.40%~49.10%, 2.48%~43.70%). Soil respiration rates in the M. paniculatus and S. oblatum communities were positively correlated with the concentrations of the carbon pool (e.g., total organic carbon and microbial biomass carbon) and nitrogen pool (e.g., total nitrate and ammonium nitrogen)(P<0.01, or P<0.05). In contrast, there was a negative correlation with soil pH (P<0.01). Furthermore, the values of easily oxidized carbon, nitrate nitrogen, and water content contributed the most to variations in soil respiration rates, whereas the contributions of soil temperature, microbial carbon, total nitrogen, ammonium nitrogen, and hydrolyzable nitrogen to soil respiration dynamics ranked second. 【Conclusion】The secondary succession of Xishuangbanna tropical forests significantly promoted the soil respiration rates. The temporal variations in soil respiration rates were mainly controlled by the soil microclimate (e.g., water content), the concentrations of the carbon (e.g., easily oxidized carbon)and nitrogen (e.g., nitrate nitrogen) pools.

Key words: tropical forest, secondary succession, soil respiration, seasonal dynamics, soil microbial biomass carbon, carbon pool, nitrogen pool, Xishuangbanna

CLC Number:

S718

ZHAO Shuang, WANG Shaojun, YANG Bo, ZUO Qianqian, CAO Qianbin, WANG Ping, ZHANG Lulu, ZHANG Kunfeng, FAN Yuxiang. Responses of soil respiration to tropical forest secondary succession in Xishuangbanna[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2022, 46(2): 12-18.

Figures/Tables 6

Fig.1

Fig.2

Table 1

A relationship between soil respiration rates and temperature of Mallotus paniculatus and Syzygium oblatum communities in Xishuangbanna"

土层/cm soil layer	白背桐群落Mallotus paniculatus community				高檐蒲桃群落Syzygium oblatum community
土层/cm soil layer	R_s=α $e β T s$	R²	P	Q₁₀= $e 10 β$	R_s=α $e β T s$	R²	P	Q₁₀= $e 10 β$
0~5	R_s=0.116 $e 0.338 T s$	0.338	0.004	1.67	R_s=0.07 $e 0.23 T s$	0.490	0.010	2.37
≥5~10	R_s=0.55 $e 0.167 T s$	0.491	0.010	1.91	R_s=0.07 $e 0.23 T s$	0.653	<0.001	3.32
≥10~15	R_s=0.269 $e 0.7 T s$	0.064	0.006	3.38	R_s=8.453 $e 0.49 T s$	0.599	<0.001	4.92

Table 1

Table 2

Table 3

Fig.3

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样地 sites	土层/cm soil layer	R_s=a+bW				R_s=a+bW+cW					R_s=αe^bW
样地 sites	土层/cm soil layer	a	b	R²	P	a	b	c	R²	P	a	b	R²	P
白背桐群落 M. paniculatus community	0~5	9.663	-0.220	0.397	0.020	6.473	0.019	-9.524	0.158	0.047	12.522	-0.070	0.190	0.010
	≥5~10	8.932	-0.026	0.381	0.005	9.310	-0.031	1.236	0.382	0.021	11.318	-0.008	0.549	0.005
	≥10~15	4.391	-0.011	0.269	0.023	6.800	-0.037	5.146	0.439	0.001	3.437	-0.005	0.182	0.690
高檐蒲桃群落 S. oblatum community	0~5	-0.220	9.306	0.297	0.060	5.939	0.016	-7.673	0.318	0.027	11.773	-0.080	0.463	0.010
	≥5~10	5.580	0.435	0.389	0.040	-1.462	0.069	0.360	0.605	0.003	7.990	-0.070	0.595	-0.070
	≥10~15	-7.754	0.452	0.350	0.008	9.465	-1.223	0.039	0.378	0.023	8.453	0.492	0.599	0.008

指标 index	各群落土壤呼吸相关性
指标 index	白背桐群落 M. paniculatus community	高檐蒲桃群落 S. oblatum community
土壤微生物生物量碳 MBC	0.664^**	0.588^**
易氧化碳 ROC	-0.103	0.124
有机碳 SOC	0.383^**	0.354^**
硝态氮 NO₃-N	0.066^*	0.100^**
全氮 TN	0.587^**	0.653^**
铵态氮 NH₄-N	0.533^*	0.651^**
水解氮 HN	0.396	0.514
pH	-0.347^**	-0.469^**
容重 BD	-0.032	-0.155

Responses of soil respiration to tropical forest secondary succession in Xishuangbanna

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