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Delimitation of natural Se-rich land in Sanhe Town, Haidong City, Qinghai Province, China |
ZHANG Ya-Feng( ), Yao Zhen( ), ZHU Ming-Xia, MA Qiang, SHEN Xiao, WANG Shuai, HE Lian-Zhen, DAI Lu |
The Fifth Geological Exploration Institute of Qinghai Province, Xining 810099, China |
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Abstract Based on the 1∶50 000~1∶2 000 land quality geochemical survey data and the requirements of the Delimitation and the Logo for Natural Selenium-enriched Land (DZ/T 0380—2021), this study evaluated the selenium (Se) content, environmental quality, fertility quality, and irrigation water quality of soil in Sanhe Town, Ping'an District, Haidong City, Qinghai Province. The evaluation results show that: (1) The soil in Sanhe Town was alkaline; (2) The soil Se content ranged from 0.093×10-6 to 1.938×10-6, averaging 0.425×10-6; (3) The Cd, Hg, Pb, and Cr contents in the soil were all below the risk screening values of soil for agricultural land, while the As content in the soil in the southern portion of the study area was higher than its risk screening value; (4) The quality of irrigation water met the standard specified in the Green Food-Environmental Quality for Production Area (NY/T 391—2013), and the soil fertility was characterized by rich available phosphorus and potassium, and moderate nitrogen and organic matter. Based on the above evaluation results, this study delimited contiguous natural green Se-rich land of 40.46 km2, including 12% directly usable arable land (4.76 km2), and 88% potentially usable grassland (7.84 km2) and forest land (27.86 km2). They are distributed primarily in six villages, including Zhangqizhai, Luotuobao, Xicun, Dongcun, Qixinzhuang, and Sanhe villages. Considering the Se-rich industry planning and local conditions, this study proposed developing Se-rich planting in arable land and Se-rich animal husbandry by utilizing natural Se-rich forage in forest land and grassland.
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Received: 11 April 2023
Published: 23 January 2024
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Schematic representation of land use type and soil sampling location in the study area
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成土母质 | Se含量/10-6 | 土壤类型 | Se含量/10-6 | 土地利用类型 | Se含量/10-6 | 地貌类型 | Se含量/10-6 | 第四系冲洪积物 | 0.490 | 灰钙土 | 0.548 | 耕地 | 0.478 | 河流阶地 | 0.490 | 第四系风成黄土 | 0.184 | 栗钙土 | 0.355 | 草地 | 0.345 | 中低山丘陵 | 0.262 | 西宁群泥岩风化物 | 0.361 | 黑钙土 | 0.210 | 林地 | 0.343 | | | 民和组砂泥岩风化物 | 0.252 | 灰褐土 | 0.307 | 非农用地 | 0.391 | | | 磨石沟组砂岩风化物 | 0.296 | 高山草甸土 | 0.294 | | | | | 六道沟群火山岩风化物 | 0.294 | | | | | | |
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Index for classification of selenium-rich land types
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富硒土地类型 | 土壤类型 | pH | Se阀值/10-6 | 条件 | 绿色富硒地 | 中酸性土壤 | pH≤7.5 | ≥0.40 | 重金属元素镉、汞、砷、铅和铬含量符合GB 15618—2018标准;农田灌溉水水质和土壤肥力满足NY/T 391—2013要求 | 碱性土壤 | pH>7.5 | ≥0.30 | 无公害富硒地 | 中酸性土壤 | pH≤7.5 | ≥0.40 | 重金属元素镉、汞、砷、铅和铬含量符合GB 15618—2018标准;灌溉水同时满足NY/T 5010—2016要求 | 碱性土壤 | pH>7.5 | ≥0.30 | 一般富硒地 | 中酸性土壤 | pH≤7.5 | ≥0.40 | 重金属元素镉、汞、砷、铅和铬含量符合GB 15618—2018标准 |
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Index for classification of selenium-rich land types[13]
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Soil Se geochemical distribution in the study area
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Environmental quality grading map of soil As in the study area
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项目 | 绿色食品灌溉水 水质要求 | 实测值 | 值域(n=3) | 评价结果 | pH | 5.5~8.5 | 7.8~8.1 | 满足 | 总汞 | ≤0.001 | <2.5×10-6 | 满足 | 总镉 | ≤0.005 | <0.6×10-4 | 满足 | 总砷 | ≤0.05 | 0.00123~0.00166 | 满足 | 总铅 | ≤0.1 | <0.7×10-4 | 满足 | 六价铬 | ≤0.1 | <0.9×10-4 | 满足 | 氟化物 | ≤2.0 | 0.04~0.07 | 满足 | 化学需氧量 | ≤60 | 0.57~1.62 | 满足 | 粪大肠菌群/ (个·L-1) | ≤10 000 | 1080~3660 | 满足 |
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Statistical of irrigation water quality in the study area mg·L-1
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指标 | 等级 | 标准值域 | 各级样品数 | 各级比例/% | 有机质 /10-3 | Ⅰ | >15 | 57 | 35.6 | Ⅱ | 10~15 | 52 | 32.5 | Ⅲ | <10 | 51 | 31.9 | 全氮 /10-3 | Ⅰ | >1.0 | 86 | 53.7 | Ⅱ | 0.8~1.0 | 36 | 22.5 | Ⅲ | <0.8 | 38 | 23.8 | 有效磷 /10-6 | Ⅰ | >10 | 148 | 92.5 | Ⅱ | 5~10 | 9 | 5.6 | Ⅲ | <5 | 3 | 1.9 | 速效钾 /10-6 | Ⅰ | >120 | 148 | 92.5 | Ⅱ | 80~120 | 12 | 7.5 | Ⅲ | <80 | 0 | 0 |
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Statistical of soil fertility index(n=160)
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Natural selenium-rich land zoning in the study area
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