氮素营养对肯氏南洋杉幼苗生长、根系活力及氮含量的影响

Abstract

Abstract:

In order to determine the optimal nitrogen amount for Araucaria cunninghamii,an exponential fertilization trial was conducted with 8 nitrogen levels (0,50,100,150,250,350,550,750,and 950 mg ·seedling^-¹) to research the effects of different nitrogen levels on height,root-collar diameter (RCD),biomass,root activity and N content in leaves of A. cunninghamii. The result showed that: 1) Height,RCD,biomass of A. cunninghamii seedlings increased with the increase of nitrogen supply,up to 550 mg·seedling^-¹,over which growth performance and biomass were stable. The root shoot ratio slightly decreased with increasing nitrogen fertilization,but the differences were not significant. 2) Root activity increased as the nitrogen fertilization increased from 0 to 550 mg·seedling^-¹ and then decreased from 550 to 950 mg·seedling^-¹. 3) From the response curves of seedling dry mass and N content to the increasing N supply, the sufficient and optimum nitrogen loading rates for A. cunninghamii seedlings were found to be 558.82 and 573.55 mg·seedling^-¹,respectively. Based on these results,it could be concluded that 550~575 mg ·seedling^-¹ would be the optimal nitrogen amount for A. cunninghamii seedlings.

Key words: Araucaria cunninghamii, exponential fertilization, growth performance, root activity, nitrogen content

CLC Number:

S718.43

Zhang Jinhao, Zhou Zaizhi, Yang Xiaoqing, Liang Kunnan, Huang Guihua, Ma Huaming. Effects of Exponential Nitrogen Loading on Growth, Root Activity and N Content of Araucaria cunninghamii Seedlings[J]. Scientia Silvae Sinicae, 2014, 50(2): 31-36.

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Effects of Exponential Nitrogen Loading on Growth, Root Activity and N Content of Araucaria cunninghamii Seedlings

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