雄安新区富硒土地资源分布特征及开发利用评价

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Abstract Surface soil samples (0~20cm), bulk crops (wheat seeds) and root soil samples were collected from Xiong'an New District for characterizing the distribution and enrichment of soil selenium through GIS spatial analysis, correlation analysis, etc. Then, the suitability assessment of development and utilization of selenium-rich land resources was carried out with the theory model of niche suitability evaluation. The results show that the surface selenium-rich land in the new area is about 16993hm²; and the soil selenium is mainly in the form of strong organic binding, then in the residue and humic acid binding state, together accounting for more than 87% of the total pool. The proportion of average bioavailable selenium content is relatively small (water-soluble selenium accounts for 4.44%, ion-exchange selenium accounts for 3.43%). The selenium-enriched rate in wheat seed samples is 28.45% and significantly correlated with that in root soil (r=0.77,P<0.01). The content of soil selenium has a significant positive correlation with "signature" soil indicators of sedimentary geomorphological environment, such as the content of Al₂O₃, Fe₂O₃, MgO, K₂O, soil organic carbon (Corg.), cation exchange capacity (CEC), clay and silt, and negatively correlated with the content of SiO₂、Na₂O and soil sand (P<0.01). Obviously, the enrichment of soil selenium is mainly affected by Quaternary sedimentary geomorphic environment even though its anomaly could be related to external sources such as irrigation water, chemical fertilizers, atmospheric dry and wet deposition (coal burning and dust reduction). And the niche theory modeling results show that the high-suitability areas (level I) and the moderately suitable areas (level II) are mainly present in Nanzhang and Xiaoli Town of Rongcheng County, Zhaili and Laohetou Town of Anxin County in the northwest of the new area, covering an area of 14397.35hm², or accounting for 8.13% of the area.

Key words： selenium soil root soil crop suitability evaluation Xiongan New District

Received: 04 January 2022

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X53

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	Articles by authors
	ZHOU Ya-long
	GUO Zhi-juan
	WANG Qiao-lin
	WANG Cheng-wen
	SONG Yun-tao
	LIU Fei

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ZHOU Ya-long,GUO Zhi-juan,WANG Qiao-lin等. Distribution characteristics and utilization evaluation of selenium-rich land resources in Xiong'an New District[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(8): 3913-3921.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I8/3913

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