TY - JOUR
T1 - Changes of condensed tannins during decomposition of leaves of Kandelia obovata in a subtropical mangrove swamp in China
AU - Zhou, Hai Chao
AU - Tam, Nora Fung Yee
AU - Lin, Yi Ming
AU - Wei, Shu Dong
AU - Li, Yuan Yue
N1 - Funding Information:
This work is published in the memory of Prof. Yi-Ming Lin’s researches on mangrove tannins. We thank Prof. Guang-Hui Lin for giving us valuable suggestions and comments, along with three reviewers. Financial support for this work from the National Eleventh Five-Year Key Project : “The research and demonstration of shelter forest of typhoon in the south subtropics”, the National Natural Science Foundation of China: “The structure and antioxidant activity of mangrove tannins and their effects on ecosystem nutrient cycling” and the Program for New Century Excellent Talents in University: “Structural diversity and biological significance of tannins during land-sea migration of mangrove species” is gratefully acknowledged.
PY - 2012/1
Y1 - 2012/1
N2 - Kandelia obovata, with abundant condensed tannins (CTs), is a typical mangrove species in China, but little is known about the chemical alterations and ecological roles of CTs during leaf litter decomposition. A litterbag experiment was conducted to investigate the changes of CTs in a subtropical mangrove swamp along Zhangjiang River Estuary, China, using the colorimetric assays, reversed/normal-phase HPLC-ESI-MS and MALDI-TOF-MS techniques. Total phenolics (TP), extractable CTs (ECT) and total CTs (TCT) decreased rapidly, while bound CTs (BCT), including protein- and fibre-bound CTs in leaves, increased during decomposition, and these temporal changes were well-expressed by exponential functions. Negative correlations between nitrogen (N) and TP, as well as N and ECT were found; however, a positive correlation between N and BCT was detected, suggesting that CTs played an important role in humification during N immobilization. The HPLC-ESI-MS analyses showed that the polymerization degree of CTs had an initial increase, due to leaching, followed by a decrease in the subsequent shift towards abiotic or/and biotic degradation. MALDI-TOF-MS confirmed the degradation processes for CTs. A decrease in the degree of hydroxylation, along with an increase in glycosylation-CTs, was obtained during litter decomposition. These chemical changes enhanced the current knowledge on the potential ecological role of N transformation in CTs in mangrove swamps.
AB - Kandelia obovata, with abundant condensed tannins (CTs), is a typical mangrove species in China, but little is known about the chemical alterations and ecological roles of CTs during leaf litter decomposition. A litterbag experiment was conducted to investigate the changes of CTs in a subtropical mangrove swamp along Zhangjiang River Estuary, China, using the colorimetric assays, reversed/normal-phase HPLC-ESI-MS and MALDI-TOF-MS techniques. Total phenolics (TP), extractable CTs (ECT) and total CTs (TCT) decreased rapidly, while bound CTs (BCT), including protein- and fibre-bound CTs in leaves, increased during decomposition, and these temporal changes were well-expressed by exponential functions. Negative correlations between nitrogen (N) and TP, as well as N and ECT were found; however, a positive correlation between N and BCT was detected, suggesting that CTs played an important role in humification during N immobilization. The HPLC-ESI-MS analyses showed that the polymerization degree of CTs had an initial increase, due to leaching, followed by a decrease in the subsequent shift towards abiotic or/and biotic degradation. MALDI-TOF-MS confirmed the degradation processes for CTs. A decrease in the degree of hydroxylation, along with an increase in glycosylation-CTs, was obtained during litter decomposition. These chemical changes enhanced the current knowledge on the potential ecological role of N transformation in CTs in mangrove swamps.
KW - Condensed tannins
KW - HPLC-ESI-MS
KW - Kandelia obovata
KW - Litter decomposition
KW - MALDI-TOF-MS
KW - Nitrogen transformation
KW - Zhangjiang River Estuary mangrove swamp
UR - http://www.scopus.com/inward/record.url?scp=80054085665&partnerID=8YFLogxK
U2 - 10.1016/j.soilbio.2011.09.015
DO - 10.1016/j.soilbio.2011.09.015
M3 - Article
AN - SCOPUS:80054085665
SN - 0038-0717
VL - 44
SP - 113
EP - 121
JO - Soil Biology and Biochemistry
JF - Soil Biology and Biochemistry
IS - 1
ER -