摘要
Abstract
Aims Bauhinia faberi var. microphylla is an important candidate shrub for vegetation restoration in the arid valley, SW China. Fertilization may facilitate the survival and establishment of B. faberi seedlings. Therefore, research on the nutrition limitation type of this species is necessary. It is very significant for revegetation in the arid valley to fertilize the Bauhinia faberi seedlings, which could influence the survival growth and settlement.
Methods Field investigation was carried out on N:P stoichiometry of Bauhinia faberi seedlings in Feihong, the core district of dry valley, Shidaguan in north (the transition region between arid valley shrub and subalpine forest) and Lanxin in south (the transition region between arid valley shrub and temperate forest); two greenhouse experiments which investigated N:P stoichiometry, the growth parameters (basal diameter, leaf number and seedling length) and biomass of each components (root, stem and leaf) were carried out, one fertilizing N at rates of 100, 280, 460 mg·kg-1 and P fertilization at rates of 12, 24, 48 mg·kg-1, while the other fertilizing N at rates of 40,70, 100 mg·kg-1 and P fertilization at rates of 12,24 mg·kg-1,.
Important Findings The results showed that, the biomass and nutrient concentration was increased with the addition of P fertilizer, and the leaf N : P ratio of B. faberi seedlings in different communities in field was higher than 16, which both implied that the growth of B. faberi was mainly limited by P nutrient. In the greenhouse experiments, N application did not enhance the biomass accumulation, but restrain the growth of B. faberi. P application increased the accumulation of biomass, which suggested the nutrient limitation type is P limitation.
关键词
岷江干旱河谷/小马鞍羊蹄甲/养分限制类型/N∶P比/植被恢复Key words
dry valley/ Bauhinia faberi var. microphylla/ nutrient limitation/ N : P ratio/ restoration分类
农业科技
