| 摘要: |
| 选取辽宁獐子岛近岸海域大叶藻样品, 对其须根、根状茎和不同生长阶段叶片的灰分含量、热值和元素含量(碳、氮、磷)及其相关性进行研究, 结果表明: 在不同生长阶段, 叶片长度随着生长顺序先增大后减小; 灰分含量随着叶片生长逐渐升高, 且极显著小于根状茎和须根(P<0.01); 不同部位干质量热值差异极显著(P<0.01), 以初生叶最高, 为(14.89±0.040)kJ/g, 后逐渐减小, 在须根中最小, 为(8.15±0.079)kJ/g; 不同生长阶段叶片的去灰分热值差异不大, 但极显著大于须根和根状茎(P<0.01); 碳、氮、磷含量均呈同一趋势: 初生叶>幼叶>成熟叶1>成熟叶2>衰老叶>根状茎>须根; N/P比值为27.08, 说明大叶藻存在P 限制; N/P 比值在根状茎中最大, 须根中最小, 这说明大叶藻存在能量的转移和存贮; 大叶藻不同部位灰分含量与干质量热值、去灰分热值、碳含量、氮含量、磷含量之间呈极显著的负相关(P<0.01), 干质量热值与碳含量、氮含量、磷含量之间呈极显著的正相关(P<0.01); 大叶藻不同部位的热值与碳、氮、磷元素含量之间均呈显著的线性关系(P<0.05)。 |
| 关键词: 大叶藻 不同生长阶段叶片 灰分含量 热值 元素含量 相关性 |
| DOI：10.11693/hyhz20140300072 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目, 41006079号; 辽宁省特色产业基地计划产业化项目, 2010416022号; 浙江省近岸水域生物资源开发与保护重点实验室开放基金, J2012009号。 |
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| CALORIC VALUES, ELEMENT CONTENTS (CARBON, NITROGEN, AND PHOSPHORUS) OF ZOSTERA MARINA AND THEIR CORRELATIONS |
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YANG Gui-Fu1, XING Kun1, LI Geng2, LIU Hai-Ying1, PAN Yu-Zhou2, ZHANG Li2
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1.College of Marine Science and Environment, Dalian Ocean University, Dalian 116023, China;2.Yingkou Enhancement and Experiment Station, Chinese Academy of Fishery Sciences, Yingkou 115004, China
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| Abstract: |
| The root, rhizome, and leaves of eelgrass Zostera marina L. were collected from the coast of Zhangzi Island in Dalian, Liaoning Province. The leaves were sampled in five age categories from new leaf to old one in different sizes. Ash contents, caloric values and element contents (carbon, nitrogen, and phosphorus), and the correlations among those plant parts were studied. When leaves grew up, the ash contents gradually increased. On the other hand, gross caloric value (GCV) in the different parts showed significant difference (P<0.01), of which the new leave was the largest for (14.89±0.040)kJ/g. When leaves grew up, the GCV gradually decreased; and the lowest was found in the root for (8.15±0.079)kJ/g. Ash-free caloric value (AFCV) of leaves of different ages was slightly different from each other. Contents of carbon, nitrogen, and phosphorus showed the same trend: young leaves > old leaves > rhizome > root. N:P ratios in the different parts were similar in average of 27.08, revealing phosphorus limitation for this species. The different distribution of these indices reflected the energy transfer from older tissues to younger ones and energy storage in active tissues. Ash contents was in significantly negative correlation with GCV, AFCV, carbon content, nitrogen content, and phosphorus content (P<0.01). GCV was in significant positive correlation with all chemical elements contents (P<0.01). Moreover, there were significant linear relationships between caloric values and the contents of those elements (P<0.05). |
| Key words: Zostera marina L. leaves at the different growth stages ash contents caloric values elemental contents correlation |
