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Citation:

The Effects of Nitrogen Deposition on Leaf Physiological and Photosynthetic Characters of Schima superba Seedlings from Three Provenances

  • Received Date: 2012-10-22
  • To evaluate the responses of physiological and photosynthetic character of Schima superba leaf to elevated nitrogen (N) deposition, dissolved NH4NO3 with different treatments (0, 50, 100 and 200 kg·hm-2·a-1 N) was sprayed on one-year-old seedlings of three S. superba provenances. The photosynthetic light response curve, leaf N/P/pigments and soluble protein contents were determined. The results indicated that the treatment of 100 kg·hm-2·a-1 N deposition increased the apparent quantum efficiency (AQE), light saturation point (LSP), and maximum net photosynthetic rate (Pmax), but reduced the dark respiration rate (Rd). Meanwhile, the leaf N and pigment content were higher, but leaf P and soluble protein content were lower than that of the control. However, the treatments of 200 kg·hm-2·a-1 N deposition had a negative effect on the seedlings. There was large difference among the three provenances. The Hangzhou provenance from Zhejiang Province(HZ) had higher Pmax and could use low light easily. However, it was hard to accumulate the assimilation product. The Jian’ou provenance (JO) from Fujian Province showed stronger ability in using high light and the Rd was lower too, so this provenance was easier to accumulated assimilation product than other provenances. The leaf net photosynthetic rate, pigment and soluble protein content of HZ increased under the treatment of 50 kg·hm-2·a-1 N deposition, however, the Rd was reduced. The leaf pigment and soluble protein content of JO provenance was lower, but the production was largest under 100 kg·hm-2·a-1 N. The N deposition of 50 kg·hm-2·a-1 N promoted the photosynthetic rate of the Xinfeng provenance (XF) from Jiangxi Province increased the soluble protein content and improved the ability in using low light and the Rd was not increased either.
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The Effects of Nitrogen Deposition on Leaf Physiological and Photosynthetic Characters of Schima superba Seedlings from Three Provenances

  • 1. Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Fuyang 311400, Zhejiang, China
  • 2. Laoshan Forest Farm of Chun'an County, Zhejiang Province, Chun’an 311700, Zhejiang, China

Abstract: To evaluate the responses of physiological and photosynthetic character of Schima superba leaf to elevated nitrogen (N) deposition, dissolved NH4NO3 with different treatments (0, 50, 100 and 200 kg·hm-2·a-1 N) was sprayed on one-year-old seedlings of three S. superba provenances. The photosynthetic light response curve, leaf N/P/pigments and soluble protein contents were determined. The results indicated that the treatment of 100 kg·hm-2·a-1 N deposition increased the apparent quantum efficiency (AQE), light saturation point (LSP), and maximum net photosynthetic rate (Pmax), but reduced the dark respiration rate (Rd). Meanwhile, the leaf N and pigment content were higher, but leaf P and soluble protein content were lower than that of the control. However, the treatments of 200 kg·hm-2·a-1 N deposition had a negative effect on the seedlings. There was large difference among the three provenances. The Hangzhou provenance from Zhejiang Province(HZ) had higher Pmax and could use low light easily. However, it was hard to accumulate the assimilation product. The Jian’ou provenance (JO) from Fujian Province showed stronger ability in using high light and the Rd was lower too, so this provenance was easier to accumulated assimilation product than other provenances. The leaf net photosynthetic rate, pigment and soluble protein content of HZ increased under the treatment of 50 kg·hm-2·a-1 N deposition, however, the Rd was reduced. The leaf pigment and soluble protein content of JO provenance was lower, but the production was largest under 100 kg·hm-2·a-1 N. The N deposition of 50 kg·hm-2·a-1 N promoted the photosynthetic rate of the Xinfeng provenance (XF) from Jiangxi Province increased the soluble protein content and improved the ability in using low light and the Rd was not increased either.

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