Effects on Heavy Metals in Karst Region Soil and the Enrichment Characteristics of Rice-Rape Rotation
Effects on Heavy Metals in Karst Region Soil and the Enrichment Characteristics of Rice-Rape Rotation
复制标题
喀斯特地区土壤重金属影响及稻油轮作富集特征
DOI：
10.15244/pjoes/99242
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发表时间：
2019-01-01
影响因子：
1.8
通讯作者：
Wen, Ximei
中科院分区：
文献类型：
--
作者：
Zhang, Zhenming;Zhang, Qinghai;Wen, Ximei
喀斯特地区耕地相对较少，但耕地中重金属含量较高。在此情况下，不同耕作方式对土壤重金属活性的影响不同。本研究通过田间试验和室内分析，分析了不同轮作制度对油菜和水稻不同生育期土壤重金属活性的影响以及重金属在土壤中的迁移和富集规律。结果表明，在稻油轮作中，土壤重金属含量的分布是不同的。土壤中Cr、Pb、Cu含量处于“清洁”水平，Cd含量处于中度污染水平。油菜生长过程中富集因子的大小顺序为Cd>Cu>Pb>Cr，不同生育期油菜对同一种重金属的富集能力不同;叶、根和茎是油菜的主要富集器官，其中茎对Cu的富集能力最弱，根是Pb的主要富集器官，油菜对Cr的富集和转运能力相对较弱。水稻主要富集Cd和Cu，苗期和分蘖期对重金属富集能力相对较弱，对Cd的富集能力逐渐增强，各生育期重金属主要富集在水稻根系。
Karst regions are relatively short of arable land, but heavy metals are at high levels in arable land. Under this circumstance, different tillage methods have different effects on the activity of heavy metals in soil. In this study, through field experiments and lab analysis, the effects of different rotation systems on the activity of heavy metals and the transport and enrichment of heavy metals in soil when rape and rice were in different growth stages were analyzed. The results show that in rice-rape rotation, the distribution of the heavy metal content in soil was different. The contents of Cr, Pb and Cu in soil were at the level of "clean" and the content of Cd was at the level of middle pollution. The sequence of the enrichment factors in the growth of the rape was: Cd>Cu>Pb>Cr and its ability to accumulate the same heavy metal varied from different growth stages; leaf, root and stem were main enrichment organs, among which stem had the weakest enrichment ability for Cu, root was the main enrichment organ for Pb and rape had relatively weaker enrichment and transport ability for Cr. Rice mainly accumulated Cd and Cu; it had relatively weaker enrichment ability for heavy meals in the seedling and tillering stages; its enrichment ability for Cd was gradually strengthened; and heavy metals were mainly enriched in rice's root system in various growth stages.