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现代地质 ›› 2025, Vol. 39 ›› Issue (04): 1108-1118.DOI: 10.19657/j.geoscience.1000-8527.2024.023

• 地球化学 • 上一篇    下一篇

江苏省里下河平原地区富硒土地资源评价及开发潜力

周欣1,2,3(), 刘强1,2,3,*(), 丁小琴1,4, 杨贵芳1,2,3, 王丹菱1,5   

  1. 1.自然资源部滨海盐碱地生态改良与可持续利用工程技术创新中心,江苏 南京 210007
    2.江苏省海洋地质调查院,江苏 南京 210007
    3.江苏华东地质环境工程有限公司,江苏 南京 210007
    4.海安市自然资源和规划局,江苏 南通 226600
    5.江苏省地质局大数据中心,江苏 南京 210007
  • 出版日期:2025-08-10 发布日期:2025-08-27
  • 通信作者: *刘强,男,硕士,正高级工程师,1985年出生,主要从事生态地质、地球化学、土壤调查及修复、盐碱地改良等工作。Email:lauqung@qq.com
  • 作者简介:周欣,男,硕士,高级工程师,1984年出生,主要从事水文地质、环境地质、地球物理勘查工作。Email:66535649@qq.com
  • 基金资助:
    江苏省2021年省级地质勘查基金项目(苏财资环[2021]46号)

Evaluation and Development Potential of Selenium-rich Land Resources in Lixiahe Plain, Jiangsu Province

ZHOU Xin1,2,3(), LIU Qiang1,2,3,*(), DING Xiaoqin1,4, YANG Guifang1,2,3, WANG Danling1,5   

  1. 1. Engineering Technology Innovation Center for Ecological Improvement and Sustainable Utilization of Coastal Saline-Alkali Land, Ministry of Natural Resources, Nanjing, Jiangsu 210007, China
    2. Jiangsu Marine Geological Survey Institute, Nanjing, Jiangsu 210007, China
    3. Jiangsu East China Geological Environmental Engineering Co.,Ltd., Nanjing, Jiangsu 210007, China
    4. Hai’an Natural Resources and Planning Bureau, Nantong, Jiangsu 226600, China
    5. Big Data Center of Jiangsu Geological Bureau, Nanjing, Jiangsu 210007, China
  • Published:2025-08-10 Online:2025-08-27

摘要:

天然富硒土地资源的开发备受关注,然而,对于远离母岩的平原区富硒土壤评价标准还存在硒有效性评估不足和有机质考虑不全面等问题。本次研究在1∶5万土地质量调查的基础上,开展了江苏海安里下河平原地区富硒土地资源分区及开发潜力评价,以期为当地富硒农业布局规划及开发提供依据。结果表明,研究区潟湖相沉积区土壤硒含量明显高于周边土壤,硒含量最高达0.63 mg·kg-1,富集区面积约66 km2;土壤硒与成土母质、土壤质地、地形条件及有机质(SOM)等均出现极显著相关性,相关系数分别为0.60、0.36、-0.60和0.86(P<0.01)。土壤富硒成因为古潟湖相的母质经表生富集作用形成的,有机质在成壤过程中对硒具有重要的吸附和固定作用,为表层土壤硒富集的关键因素。采用改进富硒土壤评价方法,圈定了优质富硒区、一般富硒区和潜在富硒区分布范围,面积分别为9.87、23.42和32.96 km2;小麦富硒率分别为86.7%、63.3%、33.3%,稻米富硒率分别为50%、25%、5%,小麦籽粒Se最高含量为0.20 mg·kg-1,总体上较稻米更易吸附硒。研究区有机质丰富,土地综合质量较好,富硒区成片分布,具有开发天然富硒小麦和水稻的潜力。

关键词: 富硒土壤, 有效硒, 里下河平原, 有机质, 江苏省

Abstract:

The development of natural selenium-rich land resources has attracted growing attention; however, there are still deficiencies in the evaluation criteria for selenium-rich soils in plain areas far from parent rocks, such as insufficient assessment of selenium availability and incomplete consideration of organic matter. Based on the 1∶50,000 land quality survey, this study conducted zoning of selenium-rich land resources and evaluation of their development potential in the Lixiahe Plain of Hai’an City, Jiangsu, aiming to provide a basis for the layout planning and development of local selenium-rich agriculture. The results showed that the soil selenium content in the lagoon facies sedimentary area of the study area was significantly higher than that in the surrounding soils, with the highest selenium content reaching 0.63 mg·kg-1 and the enrichment area covering approximately 66 km2. Soil selenium exhibited extremely significant correlations with parent material, soil texture, topographic conditions, and soil organic matter (SOM), with correlation coefficients of 0.60, 0.36, -0.60, and 0.86, respectively (P<0.01). The selenium-rich soils were formed by supergene enrichment of parent materials from ancient lagoon facies. SOM played a crucial role in adsorbing and fixing selenium during soil formation, serving as a key factor for selenium enrichment in surface soils. Using an improved evaluation method for selenium-rich soils, this study delineated the distribution of high-quality selenium-rich areas, general selenium-rich areas, and potential selenium-rich areas, with areas of 9.87 km2, 23.42 km2, and 32.96 km2, respectively. The selenium enrichment rates of wheat in these areas were 86.7%, 63.3%, and 33.3%, while those of rice were 50%, 25%, and 5%, respectively. The highest selenium content in wheat grains was 0.20 mg·kg-1, indicating that wheat is more likely to absorb selenium than rice. The study area is rich in organic matter, with high comprehensive land quality, and the selenium-rich areas are distributed in contiguous patches, showing potential for developing natural selenium-rich wheat and rice.

Key words: selenium-rich soil, effective selenium, Lixiahe Plain, SOM, Jiangsu Province

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