土地利用方式对土壤团聚体磷组分及磷库管理指数的影响

doi:10.16843/j.sswc.2023.01.010

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Abstract [Background]The Bashang region in the Northwest Hebei is an important water source in Beijing-Tianjin-Hebei. The soil and water conservation capacity of this region is greatly affected by land use types. This work is to explore the stability mechanism of soil aggregate structure on phosphorus under different land use types.[Methods] Soil samples from 7 land use types, i.e., potato field, oat field, silage corn field, open vegetable field, grassland, woodland and greenhouse vegetable field were collected. Then the soil aggregates were classified by dry sieving method to analyze the distribution law of phosphorus forms and the change of phosphorus pool management index (PPMI) in different soil aggregates. The result data were processes by Excel 2007 and SPSS 20.[Results] The content of total phosphorus (TP) in Northwest Hebei ranged from 211.72 to 441.94 mg/kg, mainly distributed in the aggregates of ≥ 0.25-0.50 mm, and water-soluble total phosphorus (WSTP) content ranged from 267.68-421.83 mg/kg, mainly distributed in the aggregates of ≥ 1.00-2.00 mm. The phosphorus pool management index (PPMI) of soil aggregates ranged from 79 to 153, with the highest value of 0.50 to 1.00 mm aggregates. The contents of water-soluble phosphorus of ≥ 0.25-0.50 mm, the TP content and proportion of ≥ 0.50-1.00 mm, and the PPMI of <0.25 mm increased in the potato field. The oat field promoted the distribution of phosphorus to the aggregate of ≥ 5.00 mm and increased PPMI. The distribution of soil TP to ≥ 1.00-2.00 mm aggregate were promoted, and the PPMI of the ≥ 0.50-1.00 mm soil aggregates increased in the silage corn field and forest land. The management index of aggregate phosphorus pool ≥ 0.50-1.00 mm was improved in the grassland. The TP content and proportion of aggregates ≥ 5.00 mm in the vegetable field, the PPMI of <0.25 mm in the greenhouse vegetable field, and the PPMI of ≥ 0.50-1.00 mm aggregate increased in the open vegetable field.[Conclusions] Large soil aggregates can increase the supply capacity of soil phosphorus holding capacity. Therefore, in the Bashang region of Northwest Hebei, the methods of adding organic fertilizer, rotating crops with high return rate, controlling potato planting, and increasing forage grass planting should be used to promote the distribution of phosphorus to the big aggregate and deduce the loss of phosphorus, thus improving the ecological benefits of the Beijing-Tianjin-Hebei water source area.

Key words： land use type soil soil aggregates phosphorus form phosphorus pool management index

Received: 26 September 2021

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S157

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	Articles by authors
	LI Fan
	WANG Jiongqi
	LIU Zigang
	ZHAO Haichao
	HE Jiangpeng
	HUANG Zhihong
	LU Haibo

Cite this article:

LI Fan,WANG Jiongqi,LIU Zigang, et al. Effects of land use types on the phosphorus component of soil aggregates and phosphorus pool management index[J]. SSWC, 2023, 21(1): 83-91.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2023.01.010 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2023/V21/I1/83

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