土壤氮素与光照对盆栽珙桐幼苗光合参数的影响

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Abstract

Davidia involucrate is a rare,endangered plant endemic to China,and is of important scientific significance in studying plant phylogeny and geological history.We explored the influence of soil nitrogen concentration and solar radiation on the growth of one-year-old seedlings of this species by measuring the photosynthesis parameters and growth parameters under different nitrogenxsolar radiation treatments.The results show that 1)high nitrogen concentration slowed down the decrease rate of net photosynthesis under unsuitable conditions;2)suitable amount of direct solar radiation may favor the growth of these ombrophyte seedlings;3)additive nitrogen can compensate the decrease caused by shading,but can hardly offset the decrease of net photosynthesis rate.

Key words： Davidia involucrate seedling soil nitrogen concentration solar radiation photosynthetic parameters

Received: 25 June 2011

:	Q945
	79	(Electron and ion emission by liquids and solids; impact phenomena)

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	SONG Tian-yu
	LIU Yan-hong

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SONG Tian-yu,LIU Yan-hong. Influence of soil nitrogen concentration and solar radiation on Davidia involucrate Baill seedlings’ growth[J]. , 2011, 30(3): 243-249.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2011/V30/I3/243

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