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- Title
Nutrient concentration and storage in different organs of Eucalyptus under effects of nitrogen topdressing.
- Authors
Qiang Ma; Wan-tai Yu; Hua Zhang; Yong-gang Xu; Jin-ning Chen; Gui-jin Chen; Shu-ying Liu; Li Deng
- Abstract
A field experiment was conducted to study the effects of nitrogen ( N) topdressing on the biomass accumulation and nutrient concentration and storage in different organs of two-year-old eucalyptus. Comparing with the control, N topdressing increased the eucalyptus biomass by 24. 2 %. Branch had the highest increment (38. 2% ) , while leaf had the lowest one. The nutrient uptake under N topdressing was improved significantly, with the order of P>K>N>Mg>Ca>Si. Leaf had the highest contents of N, P, Mg, and Si; trunk had the highest storage of K; while branch had the most significant increase of nutrient concentration and storage. The N, P, and K were recycled mainly through internal flux, with 73. 8% of N, 79. 1% of P, and 72. 9% of K in leaf transferred back to the plant before leaf fallen, and the external flux of these three nutrients only occupied 14. 8% , 1.1% , and 8. 6% of their total storage in the tree, respectively. The Ca, Mg and Si were the external flux elements, especially for Ca. 89. 2% of Ca in leaf was cycled in external flux, accounting for 25. 9% of its total storage in the tree.
- Subjects
PLANT nutrients; EUCALYPTUS; BIOMASS; NITROGEN &; the environment; NUTRIENT uptake; PHYSIOLOGY
- Publication
Yingyong Shengtai Xuebao, 2010, Vol 21, Issue 8, p1933
- ISSN
1001-9332
- Publication type
Article