陕西省渭南市卤阳湖盐碱地土壤肥力综合评价

为全面认识,有效管理和保护陕西省渭南市卤阳湖盐碱地土壤,分析了该地区土壤物理性质和盐碱特性。同时采用主成分分析法结合norm值,筛选出有机质,碱解氮,速效磷,速效钾,CEC,ESP,电导率和土壤容重8项指标,建立了该地区土壤综合质量评价最小数据集。结果表明,该地区土壤质地较黏重,土壤有机质(0.31)、碱解氮(0.39)、速效磷(0.26)、速效钾(0.38)的隶属度均值很小,是该地区土壤养分的主要限制因子。土壤容重隶属度为1,CEC隶属度为0.64,土壤碱化度(ESP)隶属度为0.61,说明该地区土壤紧实,但碱性极强。总之,利用加权求和指数法计算土壤肥力综合指数为0.277,说明该地区土壤肥力处于较低水平,需采取适当措施进行改良,以提高土壤肥力。

Soil Fertility Evaluation of Saline-alkali Land at Luyang Lake in Weinan City of Shaanxi Province

For comprehensive understanding, effective managing and protecting the saline-alkali soil of Luyang Lake in Weinan City, Shannxi Province, the authors analyzed the physical properties and salinity characteristics in the region. The principal component analysis combined with norm values were employed to select the indexes and establish the minimum data set, in which, organic matter, alkali-hydrolysable N, available P, available K, ESP, CEC, conductivity, and soil bulk density were selected as indexes for evalulating soil quality. The results showed that the soil texture was relatively heavy with more clay. The values of membership functions of the indexes revealed that organic matter(0.31), alkali-hydrolysable N(0.39), available P(0.26), and available K(0.38) were the major limited soil nutrients factors in the region. The membership degrees of soil bulk density, CEC and ESP were 1, 0.64 and 0.61, respectively, it indicated that the soil was compacted, but the alkaline was very extremely high. In short, the comprehensive index was 0.277 calculated by using the weighted index summation method to evalulate the soil fertility, which illustrated that the soil fertility in this region was at a low level. Therefore, it need to take appropriate improvement measures to improve soil fertility in Luyang Lake region.