桓仁地区林下参土壤肥力评价

Assessment of Soil Fertility of Wild Cultivated Ginseng in Huanren Prefecture of Liaoning Province

明确桓仁林下参土壤肥力状况,并科学指导林下参选林及护育。以桓仁地区19个林下参基地为评价对象,在常规养分指标基础上引入土壤微量元素指标,采用主成分分析、隶属度函数及土壤肥力综合评价指标方法,对桓仁地区土壤肥力进行综合评价。结果表明,桓仁地区土壤有机质和全氮含量分别为115.33g/kg和53.04g/kg,高于国家一级标准;碱解氮、有效钾及铜的含量均高于国家一级水平;单个指标隶属度函数与描述性统计结果相一致;通过主成分分析得到土壤肥力指标得分系数,微量元素(Al、Fe、Mn、Cu、Zn)贡献率占所有肥力指标的49.51%,表明微量元素作为土壤综合肥力评价指标科学合理;利用权重系数和肥力指标隶属度值得到土壤肥力综合评价指标值,八里甸基地最高(0.71)、肖家沟3基地最低(0.56)。评价结果与实际情况相吻合。

Soil fertility is important for P. ginseng planting in a forest environment. PCA（principal component analysis）,membership function and IFI method（soil fertility integrated index） were used to investigate quantitative evaluation of soil fertility quality of soil nutrients and microelement in soil of wild cultivated ginseng for comprehendingthe difference of soil fertility in Huanrencountry.Results showed that the content of soil organic matter and total nitrogen were 115.33 g/kg-53.04 g/kg,according to the nutrient classification standards of second soil census,the average content of soil organic matter,total nitrogen,available nitrogen,available kalium and copper were more than the first level,and the membership function of single fertility index was in accord with descriptive statistics of soil fertility. The accumulated contribution rate of soil microelements（Al,Fe,Mn,Cu,Zn） achieved 49.51% in all soil fertility index by principal component analysis,which underline the importance of microelement as part of soil fertility. By weighting coefficient and fertility index membership function,integrated evaluation index value of soil fertility was obtained,that of Balidian was the highest（0.71）,that of Xiaojiagou3 was the lowest（0.56）. The evaluation results show an acceptable agreement with ginseng production practice and can provide scientific guidance for wild cultivated ginseng to choose a suitable planting site.