Effects of Simulated Nitrogen Deposition on Non-Structural Carbohydrates of Moso Bamboo
[Objective]The subtropical zone in south-central China has become the region with the greatest nitrogen ( N) deposition in the world. Most moso bamboo ( Phyllostachys edulis) plantations of China are distributed in the center of this region. The change of non-structural carbohydrate ( NSC) in plant can reflect the effects of environmental factors on plant. However,the effects of N deposition on NSC content of moso bamboo remain unclear. The aim of this study is to estimate the effects of N deposition on the NSC contents of leaf,branch and trunk of moso bamboo at different growth stages.[Method]The experiment was conducted in moso bamboo plantations over a 32-month period and included 4 N content levels(30,60,90 kg·hm -2a -1 and zero as control)were applied in the study. Each N-content was replicated for 3 times.[Result]The soluble sugar and starch accounted for 80% and 20% of NSC,respectively. Bamboo leaf has the highest NSC content,1. 32 and 1. 27 times higher than branch and trunk,respectively. The NSC content of branch and trunk of 3-year-old bamboo were significantly higher than that of 1-year-old bamboo ( P< 0. 05 ) . No significant effect of moso bamboo age on the NSC content of leaf was observed ( P> 0. 05 ) . The NSC content of leaf and branch of 3-year-old bamboo,and trunk of 1-year-old bamboo ( P < 0. 05 ) was significantly decreased by N deposition. The interaction between N deposition and moso bamboo ages significantly influenced the NSC content of branch and trunk ( P< 0. 01 ) but not leaf were.[Conclusion]The content and distribution of NSC in moso bamboo were significantly impacted by N deposition,and these effects varied significantly with the bamboo ages. Our result indicated that the excessive atmospheric N deposition (≥ 90 kg·hm -2 a -1 ) in the future would restrain the NSC accumulation in moso bamboo and thus its carbon sequestration capacity.
国家科技期刊平台
NSTL
万方数据
维普
