土壤微生物群落对放牧的响应及其与环境因子的关系

doi:10.13866/j.azr.2025.03.07

Abstract

Abstract:

To explore the differences in the responses of different soil microbial community characteristics to grazing intensity, grasslands with different grazing intensities in the middle section of the northern slopes of Tianshan Mountains were selected as a focus for this study. Combining field investigation and indoor analysis, the changing patterns of soil microbial community characteristics with grazing intensity and their intrinsic correlation with soil factors were analyzed. The results showed that Actinobacteria and Ascomycota were the dominant phyla of bacteria and fungi, respectively. Compared with the findings upon heavy grazing, light grazing significantly increased the alpha diversity of microbial communities (P<0.05) and promoted the accumulation of soil microbial biomass carbon, nitrogen, and phosphorus contents. Redundancy analysis and Mantel test showed that the soil microbial community characteristics were positively correlated with the soil total nitrogen and negatively correlated with the soil bulk density (P<0.05). Furthermore, the structural equation model showed that grazing negatively impacted the microbial diversity, richness, biomass, and OTUs characteristics by increasing the bulk density and reducing the soil nutrients (P<0.05). Compared with other indicators, soil microbial community diversity was more sensitive to grazing. In summary, light grazing is conducive to improving the microbial community, and reasonable regulation of grazing intensity is a feasible strategy to ensure the stable development of microbial communities.

Key words: grazing intensity, soil fungi, soil bacteria, environmental factor, northern slopes of Tianshan Mountains

JIANG Kangwei, WANG Yafei, LIU Chentong, LI Hong, LYU Cheng, Tursunnay REYIMU, ZHANG Qingqing. Responses of soil microbial communities to grazing and their relationship with environmental factors[J].Arid Zone Research, 2025, 42(3): 467-479.

Figures/Tables 11

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References 32

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	放牧强度
	轻度放牧	重度放牧	未放牧
植物优势种	细果薹草+针茅+无芒雀麦（Carex stenocarpa+Stipa capillata+Bromus inermis）	醉马草+细果薹草+平车前（Achnatherum inebrians+Carex stenocarpa+Plantago depressa）	针茅+羊茅+草地早熟禾（Carex stenocarpa+Festuca ovina+Poa pratensis）
高度/cm	18.12±2.15b	11.53±1.68c	24.83±2.86a
盖度/%	92±5.23a	63±3.76b	84±3.51a
生物量/(g·m^-2)	186.75±16.73b	78.24±6.91c	223.89±14.36a
土壤有机碳/(g·kg^-1)	94.40±2.92a	91.04±3.39a	64.05±2.63b
土壤全氮/(g·kg^-1)	2.56±0.55ab	2.96±0.49a	1.35±0.46b
全磷/(g·kg^-1)	0.85±0.08a	0.88±0.06a	0.71±0.03b
全钾/(g·kg^-1)	10.93±0.57a	9.10±0.43ab	8.15±0.42b
速效氮/(mg·kg^-1)	118.46±22.79ab	129.24±22.91a	86.04±21.70b
速效磷/(mg·kg^-1)	25.60±1.36a	20.29±2.23ab	13.91±1.27b
速效钾/(mg·kg^-1)	438.78±43.11a	356.49±48.51ab	304.18±45.99b
土壤密度/(g·cm^-3)	0.65±0.03b	0.66±0.01b	0.82±0.04a
土壤含水量/%	0.47±0.04ab	0.60±0.03a	0.41±0.02b
土壤pH	7.71±0.08a	7.55±0.15a	7.15±0.14a

Responses of soil microbial communities to grazing and their relationship with environmental factors

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