鄱阳湖沙山优势植物种叶片氮磷特征

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Abstract

To discuss the ecophysiological adaptation mechanisms of plants to sandy soil and thus to provide a scientific basis for vegetation restoration, the authors analyzed nitrogen (N) and phosphorus (P) content in the leaves of 14 dominant plant species in sandy hills along Poyang Lake. Results showed that N content in the leaves of dominant plant species ranged from 3.10～16.5mg·g^-1, with an average value of 10.21mg·g^-1. P content in the leaves varied at a range of 0.70～2.10mg·g^-1, with an average value of 1.24mg·g^-1. The N content was approximately 50% lower than the average N content in the leaves of national and global plants. The P content was about 85% of the average P content in the leaves of national plants and about 70% of global plants, respectively. The relatively lower N and P content might be mainly controlled by low nutrient in the soil. Moreover, as the most dominant plant species in sandy hills, Vitex trifolia Linn. var. simplicifolia Cham had a low level of N and P content due to low soil nutrient. However, N and P content in the leaves of Vitex trifolia Linn. var. simplicifolia Cham increased with sandy intensity, which was an adaptation to water stress for higher water use efficiency. Additionally, the average ratio of N to P in the leaves was approximately 9.0, indicating that plant growth in sandy hills was mainly limited by nitrogen, rather than phosphorus.

Key words： sandy hills along Poyang Lake dominant plant species leaf nitrogen phosphorus

Received: 25 April 2010

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	HU Qi-wu
	HU Qi-wui
	ZHENG Lin
	WU Qin
	LI Xiao-feng
	CAO Yun

Cite this article:

HU Qi-wu,HU Qi-wui,ZHENG Lin, et al. Study on nitrogen and phosphorus content in the leaves of dominant plant species in sandy hills along Poyang Lake[J]. , 2010, 29(2): 97-101.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2010/V29/I2/97

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