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Scientia Silvae Sinicae ›› 2015, Vol. 51 ›› Issue (4): 36-43.doi: 10.11707/j.1001-7488.20150405

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Effects of simulated N deposition on growth and Leaf N and P Content in Seedlings of Three Provenances of Schima superba under Phosphorous Deficit Stress

Zhang Rui, Wang Yi, Jin Guoqing, Zhou Zhichun   

  1. Research Institute of Subtropical Forestry CAF Fuyang 311400
  • Received:2014-08-06 Revised:2014-11-18 Online:2015-04-25 Published:2015-05-20

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Abstract:

【Objective】 This paper focuses on how NH4+-N and NO3--N deposition impacts the growth of different provenances of Schima superba, especially in phosphorous (P) deficit soils. The results could formulate the breeding strategy of S. superba under N deposition. 【Methods】 Three representative provenances were chosen for study. These were Zhejiang Hangzhou provenance which was stand for north edge area, Fujian Jian'ou provenance which was stand for central area, and Jiangxi Xinfeng provenance which was stand for south-central edge area. One-year-old of three provenances of S. superba seedlings grown on P-limited (1.1 mg kg-1) and P-Normal soil (25 mg ·kg-1) were treated with NaNO3 and NH4Cl solutions at the following levels: 0, 80, and 200 kg N ha-1 year-1, respectively. Completely randomized experimental design was conducted and twelve seedlings were contained in each provenance and treatment. The seedlings were harvest on November 2013, and the seedling characteristics and the root, steam, the leaf N and P content were measured. 【Results】 The results showed that the growth of S.superba was significant different with different forms of nitrogen deposition and it was enlarged by P addition. The coefficient of variation of biomass and root:aboveground mass ratio (RAR) were greater under lower-P supply. S. superba responded positively to NO3--N under lower-P soil and the seedling height, SBD and biomass were 4.5 %, 17.8 % and 75.2 % higher than that with NH4+-N. S. superba's leaf N and P concentrations increased with NO3--N treatments, and the leaf N:P ratios was decreased. The NH4+-N addition had more inhibitory impact, by decreasing leaf P content and increased the leaf N:P ratios, and made plants prone to P limitation. While in high-P soil, NH4+-N had promotion affection. The seedling height, SBD and biomass were 13.5 %, 10.4 % and 25.4 % higher than with NO3--N. Whether in low-P or in high-P treatment, NO3--N decreased the leaf N:P ratios and NH4+-N increased the leaf N:P ratios. There were significant differences among provenances with different forms of nitrogen deposition. Under low-P treatment, the seedling growth of Fujian Jian'ou provenance and Jiangxi Xinfeng provenance were inhibited by NH4+-N, however, the seedling height and SBD were increased 19% and 20% respectively by NH4+-N80. 【Conclusions】 NO3--N increased the seedling of S. superba growth when soil P was lower. When soil P increased, NH4+-N instead of the increased effect and the difference between seedlings was larger. Zhejiang Hangzhou provenance was more adaptive to NH4+-N addition while Fujian Jianou and Jiangxi Xinfeng provenances were more adaptive to NO3--N.

Key words: nitrate nitrogen, ammonium nitrogen, Schima superba, provenance, nitrogen deposition, phosphorus limitation, leaf N:P ratios

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