论文部分内容阅读
通过对河北栾城农业生态站潮土和吉林白城淡黑钙土2种质地不同的土壤施用不同剂量磷肥,在25℃恒温条件下好气培养,培养期的第1、3、10、30和60天采集土样,测定土壤Olsen-P和CaCl2-P含量的动态变化,研究了磷肥施入土壤引起农业磷面源污染的可能性。利用Heckrath分段回归模型,分别对培养60d后2种土壤Olsen-P、CaCl2-P含量进行拟合,得到土壤环境敏感磷临界点对应的土壤Olsen-P含量,以此证明土壤固磷能力。结果表明:当施磷量超过400kg·m-2时,2种土壤Olsen-P和CaCl2-P含量均显著增加,并且2种土壤在相同条件下培养后,同一处理的各组分有效磷的变化规律并不相同,说明当施磷量超过400kg·hm-2,2种土壤磷流失的可能性均增加,并且不同类型土壤,磷流失能力也不同;培养60d后拟合得到的栾城和白城土壤环境敏感磷临界点对应的土壤Olsen-P含量分别为88.9和142.5mg·kg-1,表明白城土壤固磷能力明显高于栾城土壤。
By applying different doses of phosphate fertilizer to two soil layers with different soil texture of Luancheng Agricultural Ecology Station and Jilin Baicheng Dense Chernozem at Heilongjiang Province, aerobic culture was carried out at constant temperature of 25 ℃. The first, third, tenth, thirtieth, Soil samples were collected daily to determine the dynamic changes of soil Olsen-P and CaCl2-P content, and the possibility of phosphate fertilizer applied to soil to cause agricultural phosphorus source pollution was studied. Using Heckrath’s piecewise regression model, the contents of Olsen-P and CaCl2-P in the two soils were fitted to obtain the soil Olsen-P content corresponding to the critical point of soil-environment-sensitive phosphorus. The results showed that the contents of Olsen-P and CaCl2-P in the two soils increased significantly when the phosphorus application rate exceeded 400 kg · m-2, and after the two soils were cultured under the same conditions, The variation law is not the same, which shows that when the phosphorus application rate exceeds 400kg · hm-2, the possibility of phosphorus loss of 2,2 kinds of soil increases, and the phosphorus loss ability of different types of soil is also different. After 60 days of cultivation, The content of Olsen-P in soil corresponding to the critical point of soil-environment-sensitive phosphorus in Baicheng was 88.9 and 142.5 mg · kg-1, respectively, indicating that the phosphorus fixation capacity of Baicheng soil was significantly higher than that of Luancheng soil.