广安区柑橘土壤养分状况及综合肥力评价

Nutrient Status and Comprehensive Fertility Evaluation of the Citrus Soil in Guang’an District

  • 摘要: 弄清柑橘土壤肥力状况,可为柑橘施肥管理提供科学依据。本研究在广安区柑橘种植区调查采集土样109个,以pH、有机质、大量营养元素为评价指标,分析其含量及分布状况,并应用模糊综合评判法对土壤肥力进行数值化综合评价。土壤pH中值为6.97,99.08%的土壤可以种植柑橘;有机质、全氮和碱解氮平均值分别为9.34 g kg−1、0.97 g kg−1和82 mg kg−1,含量缺乏;有效磷和速效钾均值分别为36.22 mg kg−1和133 mg kg−1,有效磷含量丰富,速效钾含量中等。该区土壤综合肥力指数(IFI)平均值为0.43,综合肥力中等(3级),肥力等级为3级和4级的样点高达82.57%;各乡镇土壤平均肥力仅白马乡、花桥镇、崇望乡和东岳乡为4级,其余均为3级。主成分分析表明,有机质、全氮、碱解氮和pH是影响土壤综合肥力的最主要因素。结果表明广安区柑橘土壤综合肥力一般,有机质、全氮和碱解氮含量缺乏,需注重补充相应养分。

     

    Abstract: Objective The aim is to understand the status of citrus soil fertility and further provide scientific basis for citrus fertilization management. Method In this study, 109 soil samples in the citrus planting area of Guang’an District were selected to analyze their content and distribution with their pH, organic matter and nutrient abundance as indexes, and the fuzzy comprehensive evaluation method was applied to carry out numerical comprehensive evaluation of soil fertility. Result With a median pH of 6.97, 99.08% of the soil was able for planting citrus; the average contents of organic matter, total nitrogen and alkali-hydrolyzed nitrogen were 9.34 g kg−1, 0.97 g kg−1 and 82 mg kg−1, respectively; the content of available potassium (36.22 mg kg−1) was medium, and available phosphorus (133 mg kg−1) was abundant, respectively. The comprehensive fertility in this area was medium (level 3), a comprehensive fertility index (IFI) of 0.43, among which the sample sites with fertility grades 3 and 4 are as high as 82.57%. In detail, the soil fertility of Baima, Huaqiao, Chongwang and Dongyue townships was grade 4, while that of other townships was reached grade 3. Principal component analysis showed that organic matter, total nitrogen, alkali-hydrolyzed nitrogen and pH were the most important factors affecting soil comprehensive fertility. Conclusion The comprehensive fertility of the citrus soil in Guang'an District was ordinary, and the contents of organic matter, total nitrogen and alkali-hydrolyzed nitrogen were insufficient. Therefore, the corresponding nutrients should be supplemented.

     

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