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以“白凤”水蜜桃为研究对象,研究了“桃-鸡”种养结合模式不同饲养密度对土壤重金属含量的影响。结果表明:“桃-鸡”种养结合模式可提高土壤有效Zn含量,各处理差异均达到极显著水平;随着饲养密度增大,初期土壤有效Ni含量增加,后期土壤有效Ni含量降低;宿迁Ni含量的最大值出现在667m~2饲养10只处理,兴化Ni含量最大值出现在667m~2饲养40只处理,姜堰在667m~2饲养40~80只处理时土壤有效Ni含量低于CK;宿迁和姜堰土壤Cr含量在667m~2饲养10只处理达到最大值,兴化在667m~2饲养80只处理时达到最大值,泰州在667m~2饲养60只处理达最大值,比对照增加了28.36%。试验表明“桃-鸡”种养结合模式可提高土壤重金属含量,但均在土壤环境质量标准(GB15618-1995)范围内。因此实现“桃-鸡”立体种养模式可充分利用立地空间,同时不会对土壤造成重金属污染风险。
The effects of different stocking densities of “peach - chicken” combination mode on soil heavy metal content were studied with “Baifeng ” peach as the research object. The results showed that: “peach - chicken” combination of planting and breeding could increase the effective Zn content of soil, and the differences among treatments reached extremely significant level. With the increase of stocking density, the content of available Ni in soil increased at the early stage and the content of available Ni in later stage decreased ; The maximum value of Ni content in Suqian appeared in 10 treatments of 667m ~ 2, the maximum of Ni content in Xinghua appeared in 40 treatments of 667m ~ 2, and that of Jiangyan in 40 ~ 80 treatments of 667m ~ 2 Which was lower than CK. The content of Cr in soil of Suqian and Jiangyan reached the maximum value at the treatment of 667m ~ 2, the maximum reached at the treatment of 80 treatment at 667m ~ 2 in Xinghua and the treatment of 60 at 667m ~ 2 in Taizhou reached the maximum , An increase of 28.36% over the control. The results showed that the “peach-chicken” combination of planting and breeding could increase the contents of heavy metals in soils, but all were within the range of soil environmental quality standard (GB15618-1995). Therefore, the “peach - chicken” three-dimensional planting and breeding mode can make full use of the site space without causing the risk of heavy metal pollution to the soil.