长汀烟区植烟土壤肥力适宜性综合评价及空间分布研究

张瑛, 王海洋, 姜林, 郭学清, 钟小丽, 张星, 卢敏娇, 姬小明, 杨晓朋, 吴树松

Comprehensive Evaluation and Spatial Distribution of Soil Fertility Suitability in Changting Tobacco-Growing Area

Zhang Ying, Wang Haiyang, Jiang Lin, Guo Xueqing, Zhong Xiaoli, Zhang Xing, Lu Minjiao, Ji Xiaoming, Yang Xiaopeng, Wu Shusong

表4 各指标所属隶属度函数及拐点值

Table 4 Membership function and inflection point value of each index

拐点值 Inflection point value 抛物线型Parabola-type S型S-type pH 有机质 Organic matter (g/kg) 碱解氮 Alkali-hydrolyzable N (mg/kg) 水溶性氯 Water soluble Cl (mg/kg) 速效磷 Available P (mg/kg) 速效钾 Available K (mg/kg) 交换性钙 Exchangeable Ca (mg/kg) 交换性镁 Exchangeable Mg (mg/kg) x1 4.5 15 65 15 35 80 200 25 x2 5.5 20 100 25 － － － － x3 6.5 30 180 35 － － － － x4 7.5 45 240 45 70 350 1000 200