Welcome to visit Scientia Silvae Sinicae，Today is

Scientia Silvae Sinicae ›› 2020, Vol. 56 ›› Issue (6): 186-192.doi: 10.11707/j.1001-7488.20200618

• Scientific notes • Previous Articles     Next Articles

Effects of Nitrogen Addition on Contents of C, N and P Nutrient and Non-Structural Carbohydrate in Ulmus elongata

Conghao Hong1,Zhen Hong2,*,Xiaohua Lei3,Junfeng Wang4,Daoliang Yan4   

  1. 1. College of Biological Science and Biotechnology, Beijing Forestry University Beijing 100083
    2. Scientific Research and Management Center of East China Pharmaceutical Botanical Garden Lishui 323000
    3. Center of Lishui City Liandu District Urban Forestry Working Station Lishui 323000
    4. College of Forestry & Biotechnology, Zhejiang Agriculture & Forestry University Hangzhou 311300
  • Received:2019-06-17 Online:2020-06-25 Published:2020-07-17
  • Contact: Zhen Hong

RichHTML

13

PDF (PC)

161

Abstract:

Objective: Under the background of increasing nitrogen deposition,the effects of nitrogen deposition on carbon,nitrogen and phosphorus accumulation of endangered Ulmus elongata and their quantitative relationship and non-structural carbohydrate content were studied by adding exogenous nitrogen,so as to provide reference for the protection of this minimal population. Method: The accumulations of total carbon,nitrogen and phosphorus in roots,stems and leaves of U. elongata and their quantitative relationships between those nutrients and changes of non-structural carbohydrate contents were analyzed by applying different concentrations of nitrogen to the annual seedlings of U. elongata. Result: The leaf biomass was significantly reduced with the addition of high nitrogen (N:262.3 mg·L-1),but the root or stem biomass was not significantly affected. Both low nitrogen (N:52.46 mg·L-1) and high nitrogen treatment increased the total carbon content in roots,but significantly decreased the total carbon content in leaves. Under high nitrogen treatment,the total nitrogen content in roots,stems and leaves increased significantly,while the total phosphorus content decreased significantly with the increase of nitrogen application level. Both low and high nitrogen treatments reduced the C:N value in the plant,however C:P and N:P were the highest under high nitrogen treatment. The soluble polysaccharides and starch contents in roots and stems were increased under both low and high nitrogen treatments. The content of soluble polysaccharide and starch in leaves was significantly decreased by high nitrogen treatment. The content of non-structural carbohydrates (NSC) first decreased and then increased in roots and stems,and in leaves NSC was contrary to roots and stems with the increase of nitrogen application level. High nitrogen treatment led to the decrease of Pn,Gs,Tr,WUE and Ls in varying degrees,but the increase of Ci concentration. Conclusion: High nitrogen treatment increases N content in Ulmus elongates,and however inhibits the leaf photosynthesis,reduces the carbon accumulation and increases the phosphorus limitation,which increases the risk of endangerment. At the same time,U. elongata copes with the adverse effects of high nitrogen by accumulating more NSC in roots.

Key words: Ulmus elongata, nitrogen addition, C, N, P nutrients, non-structural carbohydrates

CLC Number: