丹江口水库消落带不同作物类型的土壤总氮分析

通过采集丹江口水库周边消落带上不同作物类型的表层土壤,测定消落区0~10 cm(A)、10~20 cm(B)不同作物类型土壤的总氮含量,分析丹江口水库消落带上不同深度土壤氮含量的分布特征。利用分光光度法测出土壤样品的含氮量。结果表明:在消落带上,随着土壤深度的增加,不同作物类型土壤的总氮含量是降低的,说明了总氮含量随着土壤深度的增加而降低。在不同的作物类型中含氮量的区别,在A层南瓜地总氮含量最大,茄子地和大豆地次之,棉花地含量最低;在B层,同样,南瓜地总氮含量最大,绿豆地和玉米地次之,高粱地含量最低。土壤总氮的局部地域分布,在A层,含量最高的是郧县,丹江口市次之,淅川县最低,在B层,含量最高的是丹江口市,淅川县次之,郧县最低。

Soil Total Nitrogen of Different Crop Types in Danjiangkou Reservoir Hydro-fluctuation Belt

By collecting surface soil of different crop types in the peripheral zone of Danjiangkou hydrofluctuation belt, the total nitrogen content of 0-10 cm (A) and 10-20 cm (B) soil layer were measured, and the distribution characteristics of soil nitrogen content in Danjiangkou hydro-fluctuation belt were analyzed. The content of nitrogen was determined by spectrophotometry. The results showed that in the hydro-fluctuation belt, with the increase of soil depth, the total nitrogen content of different crop types decreased, which indicated that the total nitrogen content decreased with the increase of soil depth. In different crop types, the soil nitrogen content was different, the total nitrogen content in A layer of pumpkin field was the highest, then was eggplant field and soybean field, the lowest was cotton field; in layer B, similarly, the total nitrogen content in pumpkin filed was the highest, then was mung field and corn field, the lowest was sorghum field. The total nitrogen content of A layer was the highest in Yun County, then was Danjiangkou City, and the lowest was Xichuan County; total nitrogen content of B layer was the highest in Danjiangkou City, then was Xichuan County, the lowest was Yun County.