The effect of organic matter addition on soil respiration and carbon component in Pinus tabuliformis forests in Taiyue Mountain, Shanxi Province, China

doi:10.12302/j.issn.1000-2006.202112045

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (1): 67-75.doi: 10.12302/j.issn.1000-2006.202112045

Special Issue: 双碳目标下的土壤碳组分

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The effect of organic matter addition on soil respiration and carbon component in Pinus tabuliformis forests in Taiyue Mountain, Shanxi Province, China

SUN Meijia¹(), ZHOU Zhiyong²^,³^,^*(), WANG Yongqiang⁴, SHEN Ying²^,³, XIA Wei¹^,²

1. College of Forestry, Beijing Forestry University, Beijing 100083, China
2. Shanxi Taiyue Mountain Forest Ecosystem National Orientation Observation and Research Station, Changzhi 046000, China
3. College of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China
4. Shanxi Lingkong Mountain National Nature Reserve Administration, Changzhi 046000, China

Received:2021-12-24 Accepted:2022-06-22 Online:2023-01-30 Published:2023-02-01
Contact: ZHOU Zhiyong E-mail:blsdyl@163.com;zhiyong@bjfu.edu.cn

Abstract

Abstract:

【Objective】 This research aims to investigate the effects of different organic matters on soil organic carbon and soil respiration in Pinus tabuliformis forest. The results can provide reference for predicting soil carbon budget of P. tabuliformis forest ecosystem in Taiyue Mountain, Shanxi Province, China.【Method】A random block design was used to add biochar (BC), maize straw (JG), Quercus mongolica leaf (LD) and P. tabuliformis leaf (YS) to 0-20 cm soil of P. tabuliformis forest in Taiyue Mountain, with no addition as control check (CK). Li-8100 automatic measurement system for CO₂ flux was used to continuously measure soil respiration rate under organic matter addition, and the contents of soil organic carbon (SOC), microbial biomass carbon (MBC), readily oxidized carbon (ROC) and dissolved organic carbon (DOC) in each treatment were monitored. Based on the relationship between soil respiration and soil organic carbon and its components, the effects of organic matter addition on soil respiration and soil carbon components of P. tabuliformis forest in Taiyue Mountain were investigated. 【Result】 (1)The addition of biochar significantly reduced the soil respiration rate, and the soil respiration rate was significantly increased by 11.67% after adding JG compared with CK, while there was no significant difference between other treatments and CK. (2)In August 2014, the addition of JG significantly increased the soil SOC, MBC, ROC and DOC contents, the addition of BC significantly increased the soil MBC content, and the addition of LD and YS significantly increased the soil SOC and MBC contents. In October 2014, the addition of JG significantly increased soil SOC, MBC, ROC and DOC contents, the addition of LD significantly increased soil MBC and ROC contents, and the addition of YS significantly increased soil SOC and MBC contents. In March 2015, the addition of JG significantly increased soil SOC, MBC and ROC contents, while the addition of LD significantly increased soil ROC contents. In May 2015, JG supplementation significantly increased soil MBC content.(3) Compared with CK, soil respiration at 10 (R₁₀) was significantly decreased by 18.01% after BC addition, and increased by 30.88% after YS leaf addition. Other organic compounds had no significant effect on soil respiration temperature sensitivity (Q₁₀) and R₁₀. (4) Soil respiration rate was significantly positively correlated with soil temperature, SOC, MBC, ROC and DOC. 【Conclusion】 The addition of organic matter significantly affected soil carbon dynamics and soil temperature and humidity, which all had significant effects on soil CO₂ emissions. The addition of JG had the most significant effect on soil organic carbon and its carbon components, but the soil respiration rate was the highest, which was not conducive to carbon storage. The addition of LD could increase soil active organic carbon content and significantly improve soil organic carbon pool quality in a short term, while the addition of BC could increase soil microbial biomass carbon content in a short term, and significantly reduce soil respiration rate, which has the best effect on reducing soil CO₂ emission.

Key words: organic matter, soil respiration, soil organic carbon, soil active organic carbon

CLC Number:

S718.5

SUN Meijia, ZHOU Zhiyong, WANG Yongqiang, SHEN Ying, XIA Wei. The effect of organic matter addition on soil respiration and carbon component in Pinus tabuliformis forests in Taiyue Mountain, Shanxi Province, China[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2023, 47(1): 67-75.

Figures/Tables 8

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有机物类型 the type of organic matter	有机碳含量/ (g·kg^-1) soil organic carbon content	全氮含量/ (g·kg^-1) total nitrogen content	碳氮比 C/N
生物炭biochar(BC)	336.02±0.18	2.61±0.11	128.74
玉米秸秆maize straw (JG)	399.22±0.09	2.45±0.21	162.95
辽东栎叶Quercus mongolica leaf (LD)	399.22±0.12	11.59±0.07	34.45
油松叶Pinus tabuliformis leaf (YS)	432.92±0.13	6.09±0.17	71.09

变量 variable	影响因素 factor	自由度 df	F	P
土壤有机碳 SOC	时间	4	7.991	<0.001
	处理	4	6.674	<0.001
	时间×处理	16	0.489	0.946
土壤微生物生物量碳 MBC	时间	4	175.746	<0.001
	处理	4	19.711	<0.001
	时间×处理	16	3.916	<0.001
土壤易氧化碳 ROC	时间	4	2.203	0.075
	处理	4	5.859	<0.001
	时间×处理	16	0.361	0.988
土壤可溶性有机碳 DOC	时间	4	15.713	<0.001
	处理	4	2.944	0.024
	时间×处理	16	0.324	0.993

变量 variable	影响因素 factor	自由度 df	F	P
土壤呼吸速率 soil respiration rate	时间	9	279.464	<0.001
	处理	4	30.942	<0.001
	时间×处理	36	1.400	0.062
土壤温度 soil temperature	时间	9	4 917.121	<0.001
	处理	4	0.483	0.748
	时间×处理	36	1.965	0.001
土壤湿度 soil moisture	时间	9	1 085.756	<0.001
	处理	4	11.582	<0.001
	时间×处理	36	2.693	<0.001

The effect of organic matter addition on soil respiration and carbon component in Pinus tabuliformis forests in Taiyue Mountain, Shanxi Province, China

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