Study on Soil Respiration Characteristics of Tobacco Fields with Ridge Tillage

doi:10.11924/j.issn.1000-6850.casb2025-0195

Abstract

Abstract:

In response to global climate warming, reducing anthropogenic greenhouse gas emissions and achieving "carbon neutrality" has become a research hotspot. The main purpose of this study is to identify the characteristics of soil respiration fluxes and their main influencing factors in traditional ridged tobacco cultivation in Yuxi, providing valuable data for enhancing carbon sequestration and reducing emissions in tobacco fields. We measured soil respiration in conventional planting patterns in the core tobacco growing area of Chengjiang City, Yuxi, Yunnan Province, using a static chamber gas chromatography technique. The study investigated the dynamics of soil respiration flux and its relationship with soil environmental and nutrient factors. The results showed that, under the conventional ridge-planting system, soil temperature at 5 cm depth on the ridge was significantly higher (P< 0.01) than in the furrow, while there was no difference in temperature between the furrow and ridge soil at 10 cm, and the moisture content of soil on the ridge from 0 to 10 cm was significantly higher (P<0.01) than that in the furrow; MBC, NH₄⁺- N, and NO₃^-- N in the soil on the ridge were significantly (P<0.01) higher than those in the furrow; the total soil respiration during the tobacco growth period was 1.45 t C/hm², with total soil respiration on ridge and in furrow being 1.60 t C/hm² and 1.30 t C/hm², respectively, with significant differences (P<0.01). The soil respiration flux under the conventional ridge planting mode of Yuxi tobacco exhibited net emissions, mainly influenced by soil MBC, DOC, temperature at 10 cm depth, and soil moisture content from 0 to 10 cm layer. The ridge-planting method caused significant differences in soil environmental and nutrient factors, as well as soil respiration flux, between the ridge and furrow areas. Therefore, when observing soil respiration characteristics in ridge-planting tobacco fields, it is essential to distinguish the difference between the ridge and furrow areas to obtain more accurate results, providing scientific support for achieving the "dual carbon" goals in tobacco fields.

Key words: soil respiration, ridge tillage, soil temperature, soil moisture, tobacco field

LIU Yuntong, YANG Hailin, ZHOU Jinhong, LI Tao, ZHANG Na, GAO Jinbo, LIU Xianbin, YANG Liyun. Study on Soil Respiration Characteristics of Tobacco Fields with Ridge Tillage[J]. Chinese Agricultural Science Bulletin, 2025, 41(35): 55-62.

Figures/Tables 7

References 33

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施肥日期	施肥种类	施肥量/(kg/hm²)	含氮量/%
4月28日（底肥）	复合肥	150	10
4月28日（底肥）	烟草专用肥	30	28
5月5日（提苗肥）	复合肥	90	10
	烟草专用肥	30	28
	硫酸锌	15	0
5月18日（追肥）	复合肥	90	10
5月18日（追肥）	硫酸锌	15	0

施肥日期	施肥种类	施肥量/(kg/hm²)	含氮量/%
4月28日（底肥）	复合肥	150	10
4月28日（底肥）	烟草专用肥	30	28
5月5日（提苗肥）	复合肥	90	10
	烟草专用肥	30	28
	硫酸锌	15	0
5月18日（追肥）	复合肥	90	10
5月18日（追肥）	硫酸锌	15	0

		环境因子(n=28)			养分因子(n=10)
		ST5/℃	ST10/℃	SWC/(%, vol)	MBC/(mg/kg)	DOC/(mg/kg)	NH₄⁺-N/(mg/kg)	NO₃^--N/(mg/kg)
均值	沟	22.2±0.1A	22.9±0.2a	19.7±2.5B	237.3±25.2B	50.6±5.3a	5.1±1.2B	13.4±3.3B
均值	垄	21.6±0.2B	22.7±0.2a	32.3±2.3A	309.7±12.1A	60.9±5.3a	37.3±4.8A	59.7±3.9A
相关系数	沟	-0.306	-0.315	-0.058	0.740^*	0.645^*	-0.490	-0.478
相关系数	垄	-0.507^**	-0.589^**	-0.441^*	0.810^**	0.837^**	0.290	-0.333

		环境因子(n=28)			养分因子(n=10)
		ST5/℃	ST10/℃	SWC/(%, vol)	MBC/(mg/kg)	DOC/(mg/kg)	NH₄⁺-N/(mg/kg)	NO₃^--N/(mg/kg)
均值	沟	22.2±0.1A	22.9±0.2a	19.7±2.5B	237.3±25.2B	50.6±5.3a	5.1±1.2B	13.4±3.3B
均值	垄	21.6±0.2B	22.7±0.2a	32.3±2.3A	309.7±12.1A	60.9±5.3a	37.3±4.8A	59.7±3.9A
相关系数	沟	-0.306	-0.315	-0.058	0.740^*	0.645^*	-0.490	-0.478
相关系数	垄	-0.507^**	-0.589^**	-0.441^*	0.810^**	0.837^**	0.290	-0.333