Seasonal changes in tannin and nitrogen contents of Casuarina equisetifolia branchlets |
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| Authors: | Li-hua Zhang Gong-fu Ye Yi-ming Lin Hai-chao Zhou Qi Zeng |
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| Institution: | (1) MOE Key Lab for Coastal and Wetland Ecosystems, School of Life Sciences, Xiamen University, Xiamen, 361005, China;(2) Fujian Academy of Forestry, Fuzhou, 350012, China |
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| Abstract: | Seasonal dynamics of total phenolics (TP), extractable condensed tannins (ECT), protein-bound condensed tannins (PBCT), fiber-bound
condensed tannins (FBCT), total condensed tannins (TCT), and protein precipitation capacity (PPC) in young, mature and senescent
branchlets of Casuarina equisetifolia were studied at Chishan Forestry Center of Dongshan County, Fujian Province, China. In addition, nitrogen contents of branchlets
at the different developmental stages were also determined. The contents of TP and ECT, and PPC in young branchlets were significantly
higher than those in mature and senescent branchlets through the season. However, PBCT contents were significantly higher
in senescent branchlets than those in young and mature branchlets; FBCT fluctuated with season. Young branchlets had the highest
N content, which decreased during branch maturity and senescence. The highest contents of TP and the lowest contents of TCT
and N in young and mature branchlets were observed in summer. There was a significant negative correlation between TP and
N contents. In contrast, TCT contents were positively correlated to N contents. Nutrient resorption during senescence and
high TCT:N ratios in senescent branchlets are the important nutrient conservation strategies for C. equisetifolia.
Project supported by the National Eleventh Five-year Key Project (No. 2006BAD03A14-01), Fujian Provincial Major Special Program
of Science and Technology (No. 2006NZ0001-2), the Program for New Century Excellent Talents in University (No. NCET-07-0725),
and the Program for Innovative Research Team in Science and Technology in Fujian Province University, China |
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| Keywords: | Casuarina equisetifolia Condensed tannins Total phenolics Nitrogen Seasonal dynamics |
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