淹水胁迫对秋茄(Kandelia candel)幼苗叶片C、N及单宁含量的影响——一个关于碳素-营养平衡假说的实验  

Effect of waterlogging on the contents of C,N and tannins of Kandelia candel seedlings:a test of the carbon-nutrient balance hypothesis

作　　者：何缘[1] 张宜辉[1] 于俊义[1] 黄冠闽[1] 林鹏[1] 

机构地区：[1]厦门大学生命科学学院,福建厦门361005

出　　处：《生态学报》2008年第10期4725-4731,共7页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目(30600077)~~

摘　　要：通过在福建厦门同安湾潮间带滩涂种植红树植物秋茄,测定不同滩面高程(黄海高程1.6,1.0,0.4m)下1年生秋茄幼苗叶片单宁、C、N、叶绿素含量及幼苗的生长指标,研究了淹水胁迫对秋茄幼苗次生代谢物质单宁的影响及作用机理。结果表明,随着滩面高程的降低,淹水胁迫增强,秋茄幼苗生物量、叶片C/N及单宁含量显著降低,在滩面高程0.4m处,与1.0m和1.6m相比,幼苗生物量分别降低了18.2%和47.0%,叶片C/N比值分别降低了17.5%和20.0%,相应地,叶片单宁含量也分别降低了44.6%和70.5%。秋茄幼苗叶片单宁含量与叶片C/N比值呈显著正相关(R=0.8425),表明秋茄幼苗叶片中C、N含量及单宁含量对淹水胁迫的响应符合碳素/营养平衡假说。This study aimed to determine the effect of waterlogging on the contents of C,N,tannins and Chlorophyll in the leaves of Kandelia candel （ L. ） seedlings, which were planted at various topographic sites in an intertidal zone of Tongan Bay, Xiamen, China. The experimental plots were on a slop and showed a maximal elevation difference of 1.6 m. Three experimental plots were set up in bare areas of intertidal zones. The mean elevations of the plots were 0.4 m, 1.0 m and 1. 6 m respectively. The intertidal elevation affects tidal inundation and the inundation period. At 1.6 m above the zero tidal level of Huang Ocean, Kandelia candel seedlings showed best growth and the higest tannin concentrations and C/N ratios. Tannin concentrations and C/N ratios tended to decline with decreasing elevation. The results showed that changes in the C, N and tannin concentrations in response to waterlogging. This indicates that longer waterlogging time resulted in lower C/ N ratios. The responses of tannins to the altered C/N ratios were that lower C/N ratios resulted in lower tannin concentrations of leaves, decreased by 44. 6% and 70. 5%, respectively, the biomass of Kandelia candel seedlings decreased by 18.2% and 47.0%. In fact, there was a significant positive correlation between tannin concentrations and C/N ratio （R = 0. 8425 ）. The response of C, N and tannins in leaves to waterlogging was consistent with carbon-nutrient balance hypothesis.

关 键 词：秋茄 淹水 单宁 C/N比值 

分 类 号：Q945[生物学—植物学]