论文部分内容阅读
研究了津沱河流域3个土类（含6个亚类）的磷酸吸收系数（PAC），以磷酸吸收系数作为土壤吸磷强度指标。结果表明，各类土壤的吸磷强度差异很大，山地土壤小于平原土壤；棕壤小于褐土，褐土小于潮土；从剖面层次看，同一类型土壤表层土壤的PAC较其它层次大。相关分析、回归分析表明，影响滹佗河流域土壤PAC的主要因素是＜0.01mm土粒（物理粘粒）含量，其次为CaCO3含量。根据目标产量，作物从土壤中携走的磷量，参考全国化肥网的试验结果，本文建议以PAC的0．4％作为“维持”施磷量计算参数。
The phosphate absorption coefficient (PAC) of three soils (including six subtypes) in the Totohe River Basin was studied, and the phosphate absorption coefficient was taken as the index of phosphorus uptake by soils. The results showed that there was a great difference in phosphorus uptake intensity among different types of soils. Mountainous soil was smaller than plain soil; brown soil was smaller than cinnamon soil and brown soil was smaller than that of alluvial soil. From the aspect of profile, the PAC of surface soil of the same type was larger than other layers. Correlation analysis and regression analysis showed that the main factors affecting the soil PAC in the Chanba River Basin were the content of <0.01mm soil particles (physical clay particles), followed by the content of CaCO3. According to the target yield, the amount of phosphorus that crops carry from the soil, referring to the test results of the national fertilizer net, this paper suggests that 0.4% PAC should be used as the parameter for “maintaining” the amount of phosphorus applied.