农牧交错带土壤营养元素分布及其改善途径——以内蒙古自治区多伦县为例

Distribution of available soil nutrients in Duolun County located in the interlaced area of agriculture and pasture and reclaimation measure

对农牧交错带内蒙古自治区多伦县61个表层土样测定分析表明,有32.0％的土样有机质含量<1g/kg,40％的土样有机质分量为1～3g/kg,属中等水平,仅有28％的土样有机质含量为3g/kg。大量元素中32.7％的土壤缺N,58.9％缺P,19.5％的土壤缺K;微量元素中100.0％的土壤缺Mo,88.7％的土壤缺Zn,52.7％的土壤缺B,24.3％的土壤缺Mn等。并进行综合评价,指出不同地型各类土壤合理施肥、退耕增产及其沙化治理、改善生态环境的对策。

Sixty-one topsoil samples around Duolun County were collected and analyzed.The results show that soil organic matter content averages 3.10g/kg (0.89~13.68g/kg),alkaline hydrolytic nitrogen 26.6mg/kg (50.1 ~ 1325.0mg/kg),Olscn-P 4.89mg/kg (1.0-15.0mg/kg),available potassium 126.Omg/kg,available zinc 0.68mg/kg (0.18 ~ 4.18 mg/kg).available manganese 12.9mg/kg (2.44-34.57 mg/kg).water soluble boron 0.49mg/kg (0.12 ~0.94mg/kg),and available molybdenum 0.05mg/kg(0.027 ~ 0.091mg/kg).Evaluations according to the above results indicate that 32.7% of the soil samples are deficient in available N,58.9% in P,19.5% inK,88.7% in Zn,52.7% in boron,24.3 % in Mn.Distribution map of the available soil nutrients are drawn and reclamation measures are recommended also.