论文部分内容阅读
以常规生产系统为对照,研究了水蜜桃有机生产系统土壤的矿质营养元素含量、理化性状及其季节差异。结果表明,有机生产系统土壤的全氮、水解氮、硝态氮、速效钾、交换性钾含量等显著高于常规,缓效钾显著低于常规,铵态氮无显著差异。中量和微量元素分析表明,有机和常规土壤中交换性镁、有效铁、有效锰、有效锌、有效铜含量丰富,有效钼含量低于缺乏临界值。有机土壤有效硼含量显著高于常规,交换性钙、有效硫、有效氯含量显著低于常规。通过主成分分析法筛选出全氮等10项养分指标,对土壤养分总方差的贡献率达到84.13%,模糊数学模型分析表明,有机土壤养分综合评价得分(S_(IFI))显著高于常规土壤。有机生产系统中土壤有机质、氮库总量增加,碳氮比下降,速效氮、钾含量和阳离子交换量提高,电导率和盐基饱和度显著降低。
Taking the conventional production system as a control, the mineral nutrient content, physicochemical properties and seasons in the soil of peach organic production system were studied. The results showed that the content of total nitrogen, hydrolyzed nitrogen, nitrate nitrogen, available potassium, exchangeable potassium in organic production soil was significantly higher than that of routine, and the slow potassium was significantly lower than the conventional ammonium nitrogen. The results of medium and trace element analysis showed that the contents of exchangeable magnesium, available iron, available manganese, available zinc and available copper were abundant in organic and conventional soils, and the available molybdenum content was below the critical value. The content of available boron in organic soil was significantly higher than that of conventional, exchangeable calcium and available sulfur, and the content of available chlorine was significantly lower than conventional. According to the principal component analysis method, ten nutrient indicators such as total nitrogen were screened and their contribution rate to total variance of soil nutrients was 84.13%. Fuzzy mathematical model analysis showed that the comprehensive evaluation score (S IFI) of organic soil was significantly higher than that of conventional soil . In the organic production system, the total amount of soil organic matter and nitrogen pool increased, the ratio of carbon and nitrogen decreased, the contents of available nitrogen, potassium and cation exchange increased, and the conductivity and base saturation decreased significantly.