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用电超滤(EUF)法研究了浙江省12个由不同粘粒矿物组成的代表性土样的供钾状况,结果表明:土壤的供钾强度(EUF—K_10)受粘粒矿物组成的影响甚小。土壤中高岭石的含量与其供钾数量(EUF—K10-30)和钾缓冲容量(EUF—K_(30-35))呈负相关,r值分别为-0.691~*和-0.760~(**)。土壤中伊利石的含量与其供钾数量和缓冲容量呈显著正相关,r值分别为0.821~(**)和0.863~(**)。高岭石含量高的土壤,钾的解吸率随时间延长而迅速下降。伊利石含量高的土壤,则钾的解吸率下降慢,并且固钾能力强。EUF—K与NH_4OAc法提取的钾和牧草吸收的钾之间都有显著的相关性,r值分别为0.912~(***)和0.884~(**)。EUF法经一轮提取又能同时提供土壤的供钾强度及数量、钾缓冲容量和固钾能力以及钾解吸率等信息,说明EUF法是研究和评价不同粘粒矿物组成的土壤之供钾状况的较好方法。
The study on the potassium supply of 12 representative soil samples from different clay minerals in Zhejiang Province showed that the potassium supply intensity (EUF-K_10) of soils was affected by the composition of clay minerals Very small. The content of kaolinite in soil was negatively correlated with the amount of potassium supplied (EUF-K10-30) and potassium buffer capacity (EUF-K30-35), and the r values were -0.691 ~ * and -0.760 ~ (** ). The content of illite in soil was positively correlated with the amount of potassium supply and buffer capacity, and the r values were 0.821 ~ (**) and 0.863 ~ (**), respectively. Kaolinite content of soil, potassium desorption rate decreased rapidly with time. In illite-rich soils, the desorption rate of potassium decreased slowly, and potassium-fixing ability was strong. There was a significant correlation between EUF-K and K uptake by potassium and herbicides extracted by NH 4 OA, with r values of 0.912 ~ (***) and 0.884 ~ (**), respectively. The EUF method can simultaneously provide information about soil potassium supply and quantity, potassium buffering capacity, potassium fixation capacity and potassium desorption rate. The EUF method is to study and evaluate the potassium supply status of soils with different clay minerals The better way.