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以慈溪市滩涂围垦区为例,通过对土壤配对样本有机质、全氮、速效磷、速效钾、电导率、pH值等土壤肥力评价指标的分析,运用模糊数学法从时间和空间两个维度对滩涂围垦区30年间的土壤肥力特征进行了综合评价.结果表明:慈溪市滩涂围垦区土壤综合肥力较30年前有所下降,土壤肥力综合指数值由1982年的0.5816下降到2012年的0.5151;其中有机质、电导率、全氮土壤肥力单项评价指标隶属度得分值下降较多;土壤综合肥力的空间变化为从南到北,土壤肥力呈阶梯状下降,由南到北土壤肥力的综合指数为:0.5413、0.5157、0.5522、0.5059.评价指标中,影响慈溪市滩涂围垦区土壤肥力程度由大到小分别为速效磷、电导率、有机质、全氮、pH和速效钾.
Taking the reclamation area of beach reclamation in Cixi City as an example, this paper analyzes the evaluation indexes of soil fertility of soil paired samples such as organic matter, total nitrogen, available phosphorus, available potassium, conductivity and pH value. By using fuzzy mathematics method, from the two dimensions of time and space The results showed that the comprehensive soil fertility in the reclamation area of beach reclamation in Cixi County dropped from 30 years ago, and the composite index of soil fertility decreased from 0.5816 in 1982 to 0.5151 in 2012. Among them, organic matter, conductivity and total nitrogen soil fertility decreased significantly, and the spatial variability of soil comprehensive fertility was from south to north, and the soil fertility decreased stepwise. From south to north, the comprehensive index of soil fertility As follows: 0.5413,0.5157,0.5522,0.5059. In the evaluation index, soil fertility affected by the reclamation area of beach reclamation in Cixi City were available phosphorus, conductivity, organic matter, total nitrogen, pH and available potassium, respectively.