攀枝花烟区土壤速效磷、钾变化趋势分析

为了查明攀枝花烟区土壤磷、钾含量以及比对其变化趋势,对该烟区170份耕层土壤样品进行了检测,结合2009—2010年土壤相关数据结果进行分析。结果表明,攀枝花烟区土壤速效磷平均含量为43.8±28.7 mg/kg,变异系数为65.5%。与5年前相比,提高幅度达到94.2%,年均提高18.8%。其中米易、盐边、仁和烟区分别提高204.9%、98.5%和110.5%。变异系数与5年前相比降低,可能原因是近年来注重磷肥施用,提高了土壤磷累积,使土壤之间的差异变小。攀枝花烟区土壤速效钾平均含量为202.6±137.4mg/kg,与5年前相比提高15.6%,年均提高3.1%。其中米易烟区提高67.8%,仁和烟区提高33.5%,而盐边烟区则降低3.7%。

The Variation Analysis of Soil Available Phosphorus and Potassium in Panzhihua Tobacco-growing Area

In order to find out the contents of soil available phosphorus and available potassium in Panzhihua tobacco-growing area, and compare the change trend with five years ago, the 170 soil samples of top layer were tested, and the related soil data in 2009―2010 were analyzed. The results showed that the soil available phosphorus content was 43.8±28.7 mg/kg. The coefficient of variation (CV) of soil available phosphorus was 65.5%. Compared with five years ago, the content of soil available phosphorus increased 94.2%, and the annual increasing rate was 18.8%. Miyi, Yanbian and Renhe tobacco-growing areas were increased by 204.9%, 98.5% and 110.5%, respectively. The CV of soil available phosphorus decreased compared with five years ago. One possible reason was that a large number of phosphate fertilization had been used in recent years and it improved soil phosphorus accumulation. The soil available potassium content was 202.6 ±137.4 mg/kg, increased by 15.6%compared with five years ago, the annual increasing rate was 3.1%. Miyi tobacco-growing area was increased by 67.8%, Renhe tobacco-growing area was increased by 33.5%, and Yanbian tobacco-growing area was reduced by 3.7%.