Effects of Nitrogen and Phosphorus Fertilizer on Biomass Allocation and Leaf Nutrient Content of Cyclobalanopsis glauca and Castanopsis sclerophylla Seedlings

In order to understand the influence of nitrogen and phosphorus on the growth of the evergreen broad leaved tree species,the effects of different amount of nitrogen and phosphorus application on leaf nutrient content,root,stem and leaf biomass of Cyclobalanopsis glauca and Castanopsis sclerophylla were studied with pot experiment.Results showed that both nitrogen and phosphorus fertilizer could increase leaf nitrogen content of the two species.Phosphorus fertilizer increased the phosphorus content in the leaves,while a high concentration of nitrogen fertilizer reduced phosphorus content.Low concentration of nitrogen and phosphorus fertilizer might slow the decline of leaf phosphorus content of Cyclobalanopsis glauca seedlings.Nitrogen and phosphorus promoted leaf carbon content of Cyclobalanopsis glauca seedlings increasing,but had no significant effects on that of Castanopsis sclerophylla seedling.For Cyclobalanopsis glauca,the biomass allocation in a descending order was root,leaf and branch,after nitrogen application,and the order was root,branch and leaf after phosphorus application,while for Castanopsis sclerophylla seedlings,the orders both were root,branch and leaf after nitrogen and phosphorus application.Cyclobalanopsis glauca and Castanopsis sclerophylla seedling were sensitized to nitrogen and phosphate fertilizer,so,suitable nitrogen and phosphate fertilizer would benefit their growth.