陕南杜仲林地土壤营养状况及施肥效应

Nutrients in Forest Soils of Eucommia ulmoides Oliv and Its Responses to Fertilization in South of Shaanxi Province

分析了陕南杜仲主要产区林地土壤的营养状况及其与杜仲生长间的关系,并通过大田多点肥料对比试验评价了杜仲施肥的效果。结果表明,研究地区林地土壤养分普遍缺乏,其中以土壤有效养分的缺乏尤为严重。土壤全氮及有效磷含量高低是影响陕南杜仲生长的关键因素。施肥显著地促进了杜仲当年高度、胸径的生长及树体各部分生物量的累积;同时,林地施肥还表现出了明显的后效。

The nutrients in forest soils and their relationship with the growth of Eucommia ulmoides Oliv(EUO) in the south of Shaanxi province were analyzed; and field experiments were carried out at different sites to evaluate the responses of EUO to the fertilization. The results showed that the levels of nutrients in the soils were very low, especially for the available nutrients in the soils. The levels of total N and availableP in soils are considered as the key factors to limit the growth of EUO. The application of fertilizer significantly increased the height and diameter of EUO in the first year; so did the biomass weights of different parts of EUO. Furthermore, the EUO added the fertilizers showed a significantly positive growth in the second year after the fertilization.