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| Effects of nitrogen absorption of Vitex negundo in different nitrogen fertilization levels |
| Zhao Yong1, Zhu Yanfeng1, Wang Qian1, Chen Zhen1, Fan Wei2, Yang Xitian1 |
| 1．The Forestry College, Henan Agricultural University, 450002；2. The Henan Forestry Academy,450003: Zhengzhou, China |
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Abstract Taken Vitex negundo community in Taihang mountainous region as object, this paper studied the effects nitrogen absorption of Vitex negundo in different nitrogen fertilization levels. The main purpose of this paper is to discover the response of plant to different nitrogen environment. Results showed that：1) Both the contents of nitrogen in mature and withered leaves increased with increased nitrogen fertilization level, and the maximum values occurred at 32g/m2 nitrogen fertilization level. Nitrogen fertilization had obvious effects on the content of phosphor in mature leaves with the maximum value being at 8g/m2, which was 2.29 times that of control. Whereas it had nothing to do with the content of phosphor in withered leaves. 2) Nitrogen fertilization could lead to the decrease of nitrogen resorption efficiency of Vitex negundo. The nitrogen fertilization was negatively correlated with nitrogen resorption efficiency, average decrease being up to 18.57%. But when nitrogen fertilization level was 4-8g/m2, the change of nitrogen resorption rate was not obvious. 3) The content of nitrogen in soil increased with increased nitrogen fertilization level. The maximum value of phosphor content in soil was at 4g/m2 nitrogen fertilization level, and the content of phosphor decreased after that point. Nitrogen resorption efficiency of Vitex negundo negatively correlated with soil organic matter and soil moisture content.
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Received: 26 April 2011
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