氮磷复合肥添加对高寒草甸金露梅灌丛中豆科植物的影响

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Abstract

We examined how nitrogen(N) and phosphorus(P) concentrations,and N:P ratio in legumes varied among different species and fertilizer additions,and how they were related to nutrient availability in soil.We analyzed data from field studies in Potentilla fruticosa shrubs in alpine meadow adopting fertilization experiments with legumes.The results showed that adding N and P to Medicago ruthenica Linn.and Gueldenstaedtia diversifolia Maxim increased P concentration and decreased N:P ratio,but had little effect on N concentration in leaves.N and P addition had no significant effect on N and P concentrations of Oxytropis kansuensis Bunge.P concentration was more variable than N concentration,while the variation in N:P ratie was intermediate.N concentration varied more significantly among species than among treatments,whereas P concentration and N:P ratio varied more significantly among treatments than among species.Nutrient concentration and N:P ratio in the vegetation were poorly correlated with available N and P in soil.This study suggests that the responses of individual plant species to fertilization can not be predicted from their N:P ratios but from their N and P concentrations.One-time application of nitrogen and phosphorus fertilizer can not effectively raise nitrogen supply in the second year,but it can increase the supply of soil phosphorus.In addition,in order to protect the legumes,NH₄H₂PO₄ should not be applied over 80 g·m^-2 in Potentilla fruticosa shrubs.

Key words： Potentilla fruticosa shrub legumes fertilization N concentration P concentration N:P ratio

Received: 25 December 2010

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	Articles by authors
	CHEN Ling-yun
	ZHAO Jun
	ZHANG Ren-yi
	WANG Shao-mei

Cite this article:

CHEN Ling-yun,ZHAO Jun,ZHANG Ren-yi, et al. Effects of nitrogen and phosphorus fertilization on legumes in Potentilla fruticosa shrub in alpine meadow[J]. , 2010, 29(6): 512-517.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2010/V29/I6/512

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