奶牛场象草地土壤质量现状评价

Assessment for Soil Quality Status in Elephant Grass Field Fertilized with Cow Feces

对养殖场内施用奶牛粪的象草地土壤和未施用粪便的胡枝子园土壤选点采样,测定四个季节土壤样品的相关指标,探讨施用牛粪对象草地土壤质量的影响,并对奶牛场土壤质量现状进行评价。结果表明,象草地的氮、磷负荷量低于土壤氮、磷负荷量警戒值。四个季节(除春季锌的含量和夏季全磷的含量无显著差异外)施用牛粪的土壤中有机质、全氮、全磷、铜、锌等指标含量均显著的高于未施肥的区域(P<0.05),四个季节(除冬季全磷和锌含量无显著差异外)距离粪便堆积中心较近的未施肥区域的土壤各指标的含量均显著的高于距离较远的未施肥区域(P<0.05)。四个季节施用牛粪的象草地土壤铜、锌单项污染指数均小于1,为清洁水平。研究结果为评估奶牛养殖场环境污染风险及与牧草结合的奶牛养殖模式的合理性提供参考。

To evaluate the soil quality status in elephant grass field fertilized with cow feces, this ex- periment sampled elephant grass field fertilized with cow feces soil and lespedeza garden soil that did not fertilized, related chemical indexes were determined, and the effects of cow feces on elephant grass field soil were assessed. The results show that the load of feces on elephant grass field soil did not exceed the warning value of load of feces on soil counted by nitrogen and phosphorus. In the four seasons, chemical indexes of soil in elephant grass field fertilized with cow feces were higher than those indexes in lespedeza garden which did not fertilized. The soil indexes of the soil samples close to the center of the deposits with- out fertilization were higher than that of the farther distance soil without fertilization. The individual pol- lution index of copper and zinc in four seasons were both less than 1, being the clean level. The article pro- vides a reference for assessing the risk of environmental pollution and the rationality of dairy farm pattern involving grass.