水深对铜藻光合作用、营养组成和氮磷吸收的影响  

Effects of water depth on photosynthesis,nutrient composition,and nitrogen and phosphorus uptake of Sargassum horneri

作　　者：孟沛艺 房景辉[1] 王强[1] 汪文俊[1] Meng Peiyi;Fang Jinghui;Wang Qiang;Wang Wenjun(State Key Laboratory of Mariculture Biobreeding and Sustainable Goods,Yellow Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Qingdao 266071,China;Graduate School of Chinese Academy of Agriculture Sciences,Beijing 100081,China)

机构地区：[1]中国水产科学研究院黄海水产研究所海水养殖生物育种与可持续产出全国重点实验室,山东青岛266071 [2]中国农业科学院研究生院,北京100081

出　　处：《海洋学报》2024年第11期65-74,共10页

基　　金：国家重点研发计划课题(2023YFD2401101);国家藻类产业技术体系(CARS-50);泰山学者工程(tsqn202312279)。

摘　　要：铜藻(Sargassum horneri)具有较好的经济性状和价值,其养殖逐渐受到人们的重视。但目前对于其适宜养殖水深尚不清楚,并且对处于不同养殖水深铜藻的生理特征和生态功能也不明确。根据不同水深的光照强度,比较了不同水深(0.5 m和2 m)铜藻的初级生产力、营养盐吸收能力以及藻体营养组成。结果显示,不同水深的光照强度差异显著(P<0.05),水深引起的光照强度差异与铜藻的初级生产力显著相关。生长在水深0.5 m处(上层)铜藻的总生产力显著高于水深2 m处(下层)的铜藻(P<0.05),上层铜藻表现出更高的初级生产力和固碳能力。光照条件下,上层铜藻对NH_(4)^(+)、PO_(4)^(3-)的吸收效果显著优于下层铜藻(P<0.05),在净化富营养化水体,调控水域生态平衡方面有很好的潜力;但上层铜藻对NO_(3)^(-)、NO_(2)^(-)的吸收量却显著低于下层铜藻(P>0.05),即说明铜藻会出现一定的强光抑制现象,影响铜藻对硝态氮和亚硝态氮的吸收。不同水深铜藻的水分含量在71%~75%之间,灰分含量在20%~23%之间,总脂质含量在6%~8%之间,粗蛋白含量在8%~10%之间,两个水深处理组间的营养组成差别不大(P>0.05)。研究表明,适当提高养殖水层,铜藻可以达到更高的生产力和营养盐吸收能力,而不同水层铜藻的营养组成会保持相对稳定。文章结果对自然海区人工养殖铜藻的技术研发以及海区生态环境保护具有重要意义。Sargassum horneri has good economic traits and value,and its culture is gradually being emphasized.However,the suitable water depth for culture is still unclear,and the physiological characteristics and ecological functions of S.horneri in different water depths are also unclear.In this paper,we compared the primary productiv-ity,nutrient uptake capacity,and a1gal trophic composition of S.horeri at different water depths(0.5 m and2 m)based on 1ight intensity in different water depths.The results showed that light intensity varied significantly(P<0.05)with water depths and that the difference in light intensity due to water depth was significantly correlated with the primary productivity of S.hormeri.The total productivity of S.horneri grown at 0.5 m water depth(upper 1ayer)was significantly higher than that of S.horneri grown at 2 m water depth(lower layer)(P<0.05),and S.horneri in the upper layer showed higher primary productivity and carbon sequestration capacity.The uptake of NH_(4)^(+)andPO_(4)^(3-)by the upper layer of S.horneri was significantly better than that of the lower layer of S.horneri under the light con-ditions(P<0.05),which has good potential in purifying the eutrophic water and regulating the ecological balance of the waters.However,the uptake of NO_(3)^(-)and NO_(2)^(-) by the upper layer of S.horeri is significantly lower than the lower layer of S.horneri(P>0.05),and it indicates that some strong light inhibition phenomenon occurs in S.horneri which affects the uptake of NO;and NO2 by S.horneri.The moisture content of S.hormneri at different wa-ter depths ranged from 71%to 75%,the ash content from 20%to 23%。the total lipids content from 6%to 8%,and the cnude protein content from 8%to 10%.Nutrient composition did not differ significantly(P>0.05)between the two water depth treatment groups.Studies have shown that by appropriately raising the culture layer,S.horneri can achieve higher productivity and nutrient uptake capacity,while the nutrient composition of S.horneri in the differ-ent water l

关 键 词：铜藻 水深 营养盐 体成分组成 

分 类 号：Q949.2[生物学—植物学]