张家界市土壤硒分布规律和富硒作物研究

Spatial distribution of selenium and selenium-rich crop in Zhangjiajie

基于张家界市各乡镇位置对土壤中总硒含量进行普查(采样点不包括岩石露头、严重的工业污染和垃圾倾倒点),结合张家界市土壤背景值及采样点的经纬度,划分出张家界市富硒土壤分布图,发现其总硒含量平均值为0.38 mg/kg,富硒地区分布呈斑点状、零星状。其中,永定区和桑植县的大部分土壤中硒含量≥0.40 mg/kg,属于典型富硒区。不同土壤类型中硒含量差异显著,其中黑色石灰土>高山草甸土>石灰性黄壤>肥熟旱耕人为土>中性石质土>钙质石质土>水稻土。此外,发现富硒土壤上生长的植物基本达到富硒食品标准;土壤中总硒含量高的情况下植物中的硒含量相对较高。

The content of selenium in soils of Zhangjiajie was surveyed based on township locations （areas of rock outcrop, severe industrial pollution, garbage dumping were not sampled）. Combination of zhangjiajie soil background values and sampling points of latitude and longitude, make out zhangjiajie selenium-rich soil Distribution. Results indicate that the average selenium content was 0.38 mg/kg. The selenium-rich areas were sparsely distributed and scattered. The selenium contents in soils of Yongding District and most of the Sangzhi County were generally above 0.40 mg/kg. Soils in there two district are selenium-rich. Significant was found in selenium content in different soil types, black limy soil〉alpine meadow soils 〉 calcareous yellow soil 〉 fimi-orthic anthrosols 〉 neutral lithosol 〉 rocky calcareous soils 〉 paddy soil. In addition, the plants grown in the selenium-rich areas reached the selenium-rich food standards.