关键词: 保护性耕作、土壤风蚀量、覆盖率、影响因子, 保护性耕作、土壤风蚀量、覆盖率、影响因子

Abstract:

Assessing of fertilizing about soil nutrient, physical and chemical properties, and heavy metals through investigation, test and analysis. The result showed that the greenhouse of soil Sampled already set up 3-14 years greenhouse soil in Shiyang river valley to determine soil environmental quality items. Compared to crop land, greenhouse soil nutrients content, heavy metal residues and salt content presented a clearly increased trend with the number of greenhouse construction years increased. Greenhouse soil total N, total P, available P and K content are significant accumulation, respectively increased 35.8%, 77.7% 140% and 87.4%. Available Zn, Cu and Fe content increased 542%, 245% and 67.4%, meanwhile soil salt and heavy metals residue also had a cumulative trend, As and Hg respectively increased 309%, 871% and 358.8% compared to crop land, But not beyond the scope of impeding crop growth limitation. The electric conductivity (EC) in greenhouses was about four times as high as that in the open fields. The greenhouse of soil heavy metals, As and Hg were higher than in the open field. However, the soil EC and heavy metals of the greenhouse was not reached.