【摘要】 通过文献资料分析及实地调查和采样,对比研究了湖南省典型农田土壤的肥力状况及近30年变化趋势。结果表明:湖南省典型农田当前0~20 cm和20~100 cm土壤有机质平均含量为30.43 g/kg和11.91 g/kg,全氮平均含量为1.79 g/kg和0.82 g/kg,全磷平均含量为0.56 g/kg和0.44 g/kg,全钾平均含量为17.13 g/kg和17.17 g/kg。与第二次土壤普查结果比较:除20~100 cm土壤层次有机质和碱解氮含量呈下降趋势外,其他层次有机质、全氮、全磷、全钾、碱解氮、速效磷、速效钾等土壤养分指标呈显著增加趋势。0~20 cm土壤有酸化趋势。更多还原

【Abstract】 By analyzing soil property data resulting from the 2ndNational Soil Survey and recent soil sampling campaign,the current status of soil fertility of croplands in Hunan and its change trend in recent three decades were investigated. The results showed that the average contents of soil organic matter(SOM) of 0-20 cm and 20-100 cm soils in 2007 were 30.43 g/kg and11.91 g/kg, respectively. The contents of total nitrogen(TN), total phosphorus(TP) and total potassium(TK) of 0-20 cm and20-100 cm soils in 2007 were 1.79 g/kg and 0.82 g/kg, 0.56 g/kg and 0.44 g/kg, 17.13 g/kg and 17.17 g/kg respectively.Compared with the 2ndsoil survey, SOM content and available nitrogen(AN) content of 0–20 cm soil horizon, TN, TK, available phosphorus(AP) and available potassium(AK) contents of both 0-20 cm and 20-100 cm soil horizons increased significantly,but soil of 0-20 cm acidified significantly.更多还原