不同土地利用方式对农田土壤有机碳组分及土壤微生物量碳的影响

doi:10.13866/j.azr.2024.10.16

Abstract

Abstract:

Investigating the content characteristics of organic carbon components and microbial biomass carbon in farmland soil under different land-use methods is of considerable significance for guiding the rational utilization and management of soil resources in the Ili River Valley. By combining field investigations, sample collection, indoor analysis, and geostatistics, this study explored the content characteristics of soil SOC, POC, DOC, LFOC, EOC, and MBC in five land-use types, including dryland, irrigated land, paddy field, orchard, and abandoned land in the Ili River Valley. This study compared and analyzed the effects of land-use changes on soil organic carbon components and microbial biomass carbon in farmland in the Ili River Valley. Results showed that the contents of TN, AN, AP, and AK in soil were in the order of paddy field>irrigated land>dryland>orchard>fallow land. The nutrient content of paddy soil was significantly higher than that of the other four land-use types. The soil SOC content showed significant differences, primarily reflected in paddy fields (25.62 g·kg^-1)>dryland (13.80 g·kg^-1)>irrigated land (12.19 g·kg^-1)>orchards (11.58 g·kg^-1)>abandoned land (8.81 g·kg^-1), and all reached a significant difference level (P<0.05). The contents of soil SOC, DOC, POC, LFOC, and MBC showed the characteristics of paddy field>dryland>irrigated land>orchard>abandoned land, with significant differences. The EOC content showed the characteristics of paddy field>irrigated land>dryland>orchard>abandoned land, with significant differences. The contents of SOC, DOC, POC, LFOC, MBC, and EOC in paddy soil were significantly higher than those in the other four land-use types. A highly significant positive correlation was detected between soil SOC and POC, LFOC, and DOC in the five land-use types, with the correlation coefficients being 0.622, 0.36, and 0.489, respectively (P<0.01), indicating that soil SOC content is an important factor affecting soil particulate organic carbon, light organic carbon, and soluble organic carbon contents.

Key words: land use mode, farmland soil, organic carbon fraction, microbial biomass carbon, Ili River Valley

LI Na, XIN Huinan, LAI Ning, LI Yongfu, LYU Caixia, GENG Qinglong, DUAN Jingjing, CHEN Shuhuang. Effects of different land-use methods on the organic carbon composition and soil microbial biomass carbon of farmland soil[J].Arid Zone Research, 2024, 41(10): 1789-1796.

Figures/Tables 4

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Tab. 1

Fig. 2

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References 36

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土地利用方式	SOC/(g·kg^-1)	TN/(g·kg^-1)	AN/(mg·kg^-1)	AP/(mg·kg^-1)	AK/(mg·kg^-1)
果园	11.58±4.85b	1.12±0.38b	82.43±1.43b	12.58±3.47b	136.83±4.44b
水田	25.62±10.52a	3.36±1.50a	184.39±3.84a	30.45±1.23a	289.5±7.94a
水浇地	12.19±4b	1.33±0.79b	108±0.78b	21.48±0.78b	187.08±1.64b
旱地	13.80±8.45b	1.16±0.41b	98.93±2.72b	15.85±8.90b	142.83±7.71b
撂荒地	8.81±2.12b	0.96±0.41b	77.31±2.15b	12.26±1.71b	112.14±3.84b

指标	TN	SOC	MBC	EOC	POC	LFOC
TN	1
SOC	0.993^**	1
MBC	0.011	0.019	1
EOC	-0.078	-0.059	0.065	1
POC	0.622^**	0.618^**	0.294^**	-0.04	1
LFOC	0.36^**	0.336^**	0.224^*	-0.002	0.402^**	1
DOC	0.489^**	0.487^**	0.338^**	-0.189^*	0.732^**	0.465^**

Effects of different land-use methods on the organic carbon composition and soil microbial biomass carbon of farmland soil

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