放牧对沙地樟子松林土壤养分及微生物群落的影响

doi:10.13866/j.azr.2023.02.04

Abstract

Abstract:

A grazing and enclosed Pinus sylvestris var. mongolica forests in sandy land was selected to explore the effects of grazing on soil nutrients and microbial communities. The microbial community composition and diversity between grazing and enclosed soil was determined using high-throughput sequencing technology. Soil chemical indexes were determined for estimating variation in the nutrients. The results showed that total phosphorus content decreased significantly after grazing (P < 0.05). Soil organic carbon and total nitrogen content also decreased, while ammonium nitrogen, nitrate nitrogen, and available phosphorus increased, but the change was not significant (P > 0.05). The grazing and enclosed plots showed 17.1%-24.6% similarity in the soil microbial community composition and the OTUs of fungi and bacteria were lower in grazing than enclosed plots. At each classification level, the number of fungi and bacteria in grazing plots was less than that in enclosed plots. Results showed grazing significantly reduced the number of bacteria at the genus level(P < 0.05). The proportion of basidiomycetes in grazing was significantly lower than that in enclosure (P < 0.05). No significant indigenous effect on bacterial phylum level (P > 0.05) was observed. In terms of soil microbial diversity, grazing significantly reduced the Chao1 index and Shannon index of bacteria (P < 0.01), and had no significant effect on fungal community diversity (P > 0.05). The effect of grazing on soil bacterial diversity index was greater than that of fungi. In summary, grazing in the Pinus sylvestris var. mongolica forest in sandy land has different degrees of negative impacts on soil nutrients and soil microorganisms. Therefore, the grazing should be moderately reduced in this region to alleviate land pressure and ensure the sustainable utilization of the Pinus sylvestris var. mongolica plantation.

Key words: sandy Pinus sylvestris var. mongolica, grazing, soil nutrients, soil microorganism

ZHANG Tong, LIU Jing, HAN Xu, TONG Yuqiang, WEI Yawei. Effects of grazing on soil nutrients and microbial community of Pinus sylvestris var. mongolica forest in sandy land[J].Arid Zone Research, 2023, 40(2): 194-202.

Figures/Tables 10

Tab. 1

Tab. 2

Fig. 1

Tab. 3

Fig. 2

Fig. 3

Tab. 4

Tab. 5

Tab. 6

Correlation analysis of soil nutrients"

	有机碳SOC	全氮TN	铵态氮 $N H 4 + - N$	硝态氮 $N O 3 - - N$	全磷TP	有效磷AP
有机碳SOC	1	-	-	-	-	-
全氮TN	0.856^*	1	-	-	-	-
铵态氮NH₄⁺-N	-0.177	-0.204	1	-	-	-
硝态氮NO₃^--N	-0.458	-0.047	-0.130	1	-	-
全磷TP	0.866^*	0.708	-0.177	-0.686	1	-
有效磷AP	-0.310	0.003	0.097	0.922^**	-0.638	1

Tab. 6

Fig. 4

References 30

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处理	样地类型	林龄/a	土层厚度/cm	郁闭度	林分密度/（株·hm²）	平均高度/m	干扰方式
放牧（G）	樟子松人工林 Pinus sylvestris var. Mongolica	50	65.00	0.70	275	14.10	放牧，踩踏
围封（CK）	樟子松人工林 Pinus sylvestris var. Mongolica	50	65.00	0.70	270	14.50	无人为干扰

土壤微生物	处理	OTUs	交并集	相似度/%
真菌	CK	1451	585	24.6
	G	929	-	-
细菌	CK	14388	4272	17.1
	G	10597	-	-

土壤微生物	处理	界	门	纲	目	科	属	种
真菌	CK	1	7.6±0.89a	20.6±3.97a	47.4±7.77a	78.8±13.18a	116.4±26.88a	101.2±26.24a
	G	1	7.2±0.84a	18.8±2.17a	40.6±3.51a	64.2±5.45a	88.8±10.38a	74.6±10.41a
细菌	CK	1	26.8±2.59a	76.0±5.24a	159.4±10.06a	250.0±11.92a	371.6±25.14a	99.8±18.78a
	G	1	25.8±2.17a	74.0±2.92a	151.8±9.83a	233.2±12.89a	332.6±20.39b	83.0±11.16a

土壤微生物	指数	处理
土壤微生物	指数	CK	G
真菌	Chao1	562.92±57.90a	408.99±112.45a
	Shannon	5.59±1.37a	5.54±0.50a
	Simpson	0.91±0.08a	0.93±0.03a
细菌	Chao1	4865.30±235.67A	3825.13±84.13B
	Shannon	10.80±0.08A	10.48±0.05B
	Simpson	1.00±0.00a	1.00±0.00a

处理	有机碳 SOC/(g·kg^-1)	全氮 TN/(g·kg^-1)	铵态氮 NH₄⁺-N/(mg·kg^-1)	硝态氮 NO₃^--N/(mg·kg^-1)	全磷 TP/(mg·kg^-1)	有效磷 AP/(mg·kg^-1)
G	10.28±0.25a	0.88±0.06a	8.76±0.9a	3.28±0.29a	30.73±3.80b	3.89±0.32a
CK	12.35±1.04a	0.98±0.1a	8.21±0.97a	2.45±0.22a	56.56±5.34a	3.02±0.32a

Effects of grazing on soil nutrients and microbial community of Pinus sylvestris var. mongolica forest in sandy land

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