| Phoebe hui Cheng ex Yang is a arbor, which belongs to Lauraceae and Phoebe Nees and distributes in Sichuan, Shanxi, Yunnan, Hunan and Chongqing Provinces. It has a high landscape vale. In this paper, community structure and variety of species, structure of population and cold handiness physiological of the different fertilization treatments were studied, aim to provide a theoretical scientific basis for germplasm resources protection, rational utilization, introduction and cultivation.(1)The community species in the community is rich; there are 243 species vascular plants belonging to 176 genera and 90 families in the community, in which dicotyledon is main plant, and there are more woody plants. There are many families and genera only with one species, which account for 44.44 % and 74. 43 % of total family number and total genus numbers, respectively, meaning that plants in the community distribute randomly. The distribution type of genus in the community is complex, totally with 13 distribution types and 10 subtypes, in which, pantropic genus is the most, meaning that the community has obviously tropical and subtropical property. Phanerophyte in the community is main plant(accounting for 61.73 % of total species number), hemicryptophyte takes the second place, meaning this area is moist and heat. Hierarchical structure of the community is obvious, it can be divided into three layers including arbor, shrub and herb layers, in which, arbor layer can be further divided into two sublayers. Species number of shrub, herb and arbor layers is 126, 95 and 37, respectively, in which, species in shrub layer is the richest, that in arbor layer is the least. P. hui in arbor layer of the community has obvious advantage, its number is the most(509) with the highest basal area and important value(30.5940 m2·hm-2 and 51.94 %, respectively), also and higher average of DBH(28.19 cm). Species richness index, Shannon-Wiener index, Simpson index and Pielou evenness index(including Jsw and Jsi) of the community all are the highest in shrub layer and lowest in arbor layer. Woody plants in the community is mainlyⅠclass of sapling and Ⅱclass of seedling, meaning that the community is in normal growth status. Diameter class structure of P. hui is mainly Ⅳ class of middle tree and Ⅴ class of big tree, both account for 81. 82 %, Ⅰclass of seedling and Ⅱclass of sapling only account for 6.53 %, meaning that P. hui population is in mature status and there are some difficulties in population regeneration.(2)The result showed that the seedling heights of foliar fertilization were significantly lower than that of no foliar fertilization with N-P-K ratio 1:1:1 and 1:2:1. Among all the twelve treatments, the seedling height of three treatments which N-P-K ratio was 1:1:1, 2:1:1, 1:2:1 and with no foliar fertilization were significantly higher than that of the others. SOD, POD activity and MDA content showed certain difference among fertilization treatments. There were significant difference among three treatments with four kinds of N-P-K ratio in Proline, Soluble sugar and Soluble protein contents. The average membership of no foliar fertilization treatments was significantly lower than that of foliar fertilization treatments with the same N-P-K ratio, but cold hardiness indexes was not significantly lower or higher. The study showed that the best fertilization strategy for P. hui container seedlings was the treatment with N-P-K ratio 1:1:2 and foliar fertilization 5mmol/L salicylic acid, as the cold hardiness and seedling height of which was optimal and relatively higher respectively. |
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