重庆市植烟土壤肥力数值化综合评价

Integrated digitization evaluation on tobacco soil fertility at chongqing

本文以重庆市14个植烟区(县)为研究对象,选取了15项肥力指标,建立了土壤肥力数值化综合评价体系。根据s型或抛物线型作物效应曲线建立各项肥力指标的隶属度函数,计算出隶属度值,并按各肥力指标的相关系数确定其权重系数,从而求得各植烟土壤肥力综合指标值(︱F︱)。研究结果表明,由︱F︱值可以看出重庆14个植烟区(县)中有11个土壤综合肥力水平属于较高水平,2个属于高水平,1个属于中等水平。由隶属度值可以看出处于高水平的城口和涪陵没有严重缺乏的肥力指标,而处于较高水平的黔江、酉阳、彭水、石柱、武隆、丰都、巫山、万州、奉节、綦江、开县这11个植烟区有效氮和有效硼的绝大部分处于严重缺乏状态,处于中等肥力水平的南川有效氮、有效磷、有效钾、有效锌和有效硼都严重缺乏。

The study is devoted to integrated evaluation about the tobacco soil fertility at Chongqing. The integrated evaluation of tobacco soil fertility is studied with 15 nutrient indexes based on correlation analysis and fuzzy mathematic theory. The membership function values are also calculated by S-type membership function and Parabola-type membership function. The weight coefficients for the fertility indexes are determined by the methods of correlation coefficient. Finally ,the integrated fertility indexes（ ｜ F ｜ ） are tested. The result based on the weight coefficients indicate that there are two tobacco areas with high fertility level ,eleven tobacco areas with higher fertility level and one tobacco area with middling fertility level, based on membership function values indicate that there are not seriously lacking fertility indexes in Chengkou and Fulin ,effective B and effective N are seriously lacked in Qianjiang, Youyang, Pengshui, Shizhu, Wulong, Fendu, Wushan, Wanzhou, Fengiie,Qijiang,Kaixlan, Nanchuan is serious lack of available N,effective P, effective K, effective Zn and effective B. The result is suit to the practice yield, so the integrated evaluation result of tobacco soil nutrient indexes can well reflect soil fertility to certain extent.