[东三江平原土壤和作物硒含量特征及影响因素]。

Q2 Environmental Science
Jing-Jie Li, Tao Yang, Ming-Guo Wang, Sheng Lian, Yong-Gao Lü, Jing-Yi Cai
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引用次数: 0

摘要

为查明三江平原东部胜利农场土壤和作物中硒酸盐(Se)为查明三江平原东部胜利农场土壤和农作物中硒元素的含量特征及其影响因素,综合运用统计分析和相关分析方法,对 83 组地表土壤样品和 34 组农作物种子样品的检测结果进行了分析。结果表明,研究区土壤中 Se 含量范围为 0.12 至 0.95 mg-kg-1,平均值为 0.37 mg-kg-1,富集程度较强,富集系数为 3.18。可氧化硒是主要的硒组分,在沼泽土、白土、旱地和水田中分别占 T-硒的 81%、79%、79%和 80%。可还原硒的含量最低,不足 5%。土壤理化指标对硒含量差异的影响主要表现在:硒与 pH 值和全钾(TK)呈负相关,与阳离子交换率呈显著正相关。与阳离子交换容量(CEC)、土壤有机质(SOM)、腐殖质(HS)、全氮(TN)和全磷(TP)呈显著正相关。不同土地利用类型的平均硒含量如下:旱地;灌溉地;草地;林地,因为pH值低、SOM高的旱地土壤更易富集硒。在不同的土壤类型中,砾溶土的平均硒含量最高,为 0.45 mg-kg-1,高于研究区的平均值。第四系冲积层中的硒平均含量最高,为 0.43 mg-kg-1,其母质主要由富含有机质的湖积沉积物组成,是形成富硒土壤的重要因素之一。作物和根系土壤中的 Se 含量呈负相关。低 pH 值或高 SOM 土壤中的 Se 不易被作物吸收,其 Se 含量还受土壤 Se 形态的控制,与可利用 Se 含量呈正相关,与可氧化 Se 含量呈负相关。因此,建议减少耕地的人工施肥量,以此来提高硒的生物利用率,改变该地区作物硒含量的现状。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
[Characteristics and Influencing Factors of Soil and Crops Selenium Content in Eastern Sanjiang Plain].

Too identify seleniut(Se) content characteristics and influencing factors in soil and crops of Shengli Farm in eastern Sanjiang Plain, statistical analysis and correlation analysis were comprehensively used to analyze the test results of 83 groups of surface soil samples and 34 groups of crop seed samples. The results showed that the Se content in the study area ranged from 0.12 to 0.95 mg·kg-1, with an average value of 0.37 mg·kg-1, and the enrichment degree was stronger with an enrichment coefficient of 3.18. Oxidizable Se was the main Se fraction, accounting for 81%, 79%, 79%, and 80% of T-Se in marsh soil, white soil, dry land, and paddy field, respectively. The content of reducible Se was the lowest, accounting for less than 5%. The effects of soil physicochemical indexes on Se content differences mainly showed that Se was negatively correlated with pH and total potassium (TK) and significantly positively correlated with cation exchange capacity (CEC), soil organic matter (SOM), humus (HS), total nitrogen (TN), and total phosphorus (TP). The average content of Se in different land use types was as follows: dryland > irrigated land > grassland > forest land, as the dryland soil with low pH and high SOM was more likely to enrich Se. Among different soil types, the average Se content in gleysols was the highest at 0.45 mg·kg-1, which was higher than the average value in the study area. The average content of Se in the quaternary alluvial layer was the highest at 0.43 mg·kg-1, and its parent material mainly consisted of lacustrine sediments rich in organic matter, which was one of the important factors in forming Se rich soil. The Se content in crops and root soil showed a negative correlation. Se in low pH or high SOM soil was not easily absorbed by crops, and its Se content was also controlled by the form of soil Se, which was positively correlated with available Se content and negatively correlated with oxidizable Se content. Therefore, it is suggested to reduce the amount of artificial fertilizer used in cultivated land as a means of increasing Se bioavailability to change the current situation of crop Se levels in this area.

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来源期刊
环境科学
环境科学 Environmental Science-Environmental Science (all)
CiteScore
4.40
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15329
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