共查询到20条相似文献，搜索用时 468 毫秒
1.
大型藻类在生长过程中吸收氮磷营养物质并进行光合作用,从而发挥生态修复和固定二氧化碳的重要作用。海带作为兼具经济价值和生态价值的典型大型藻类,其重要性不言而喻。本研究以海带（Saccharina japonica）为研究对象,以VENSIM可视化软件为平台,通过建立多种环境因子与海带生长的函数关系,构建海带多因子生长数学模型。结果表明,所建模型能够较好的模拟海带在不同环境条件下的生长状态。通过Morris函数计算了模型中各参数的灵敏度,分析了光照、温度和氮磷营养盐对海带生长的影响。研究发现：在海带养殖初期,受光照影响最大;在临近收获期,受高温的限制更为明显。除了养殖规模和养殖密度都比较大的海域,氮磷营养盐一般不会对海带生长产生抑制性影响,当营养盐成为限制因素时,氮营养盐的抑制性影响要大于磷。本研究所建模型可以对不同海区海带的生长状况和影响因素进行模拟和分析,从而为海带养殖海域的管理提供参考和借鉴。 相似文献
2.
介绍了一个通过移动卫星Inmarsat-Mini C通信手段进行远程遥控和数据传输的无人值守的自动监测系统。具体内容包括Inmarsat-Mini C系统介绍、遥控系统结构和其工作流程介绍、遥控系统对Mini C业务的具体应用及与Mini C终端通信的实现。 相似文献
3.
4.
5.
海带是我国海水养殖主要品种之一,其综合应用价值较高[1].20世纪90年代末期,海带配子体克隆在海带苗种繁育中的应用,为海带育苗生产开辟了新途径[2].主要运用生长发育调控技术实现海带配子体克隆细胞大量扩增和同步成熟来繁育海带优良苗种,这样可大幅度降低育苗成本,缩短育苗周期,该项技术具有良好的应用前景.目前海带配子体克隆育苗技术尚未在海带育苗生产中得到规模化应用,其作为一项高新技术,部分关键技术仍有待进一步解决.在与有关生产单位进行海带配子体克隆育苗实验的工作中,笔者认为克隆细胞的附着是影响海带商品苗质量(出苗密度及出苗均匀程度)的关键问题之一. 相似文献
6.
为了研究近岸海带养殖活动对水体光学特性的影响,本文选取山东半岛黑泥湾海域为典型研究区,利用2021年4月和8月在该区的9站同步观测数据,分析其总悬浮颗粒物、藻类颗粒物、非藻类颗粒物以及有色溶解有机物的吸收特性,并计算各组分对总吸收系数的贡献率,同时采用Quasi-analytical algorithm (QAA)算法借助MODIS影像反演了水体总吸收系数,结合实测数据获得了黑泥湾水体吸收特性的季节变化情况。结果表明,有海带养殖季节表层水体藻类颗粒物、非藻类颗粒物、总颗粒物和有色溶解有机物的吸收系数明显大于无海带养殖季节,且春季海带养殖区水体的总吸收系数大于无海带养殖区;海底表层沉积物的再悬浮造成底层吸收系数较大,而在春季成熟期的海带汇聚较大量的有机物质导致中层藻类颗粒物吸收系数相对较高;参考波长向红波移动,QAA_v5算法能够较好地估算该区表层水体吸收系数,且在海带养殖季节水体组分会影响到更长的波段特征。本研究可为深入了解海带养殖对水体各组分浓度和分布、碳循环以及水生生态系统的结构和功能的影响提供参照,并有助于提高近岸水体组分的遥感反演精度。 相似文献
7.
藻类生产性培养的数量关系及动态预测 总被引：1，自引：0，他引：1
目前在贝类育苗中藻类培养的好坏是育苗成功与否的关键。但人们在藻类培养时 ,更多考虑的是温度、盐度、光照、ｐＨ值、营养盐等生长因子及一些日常管理。事实上 ,仅考虑这些因素还远远不够 ,还必须考虑各级培养间藻类浓度、藻类数量、每日所需投饵量、气候变化、污染等诸多动态因子及它们间的相互约束关系 ,只有这样才能保证藻类培养处于良好循环状态。许多厂家藻类培养的失败 ,很大程度上在于未能处理好这些因子。为此 ,作者总结多年来生产性培养经验 ,把这些动态因子转化为对藻类数量的影响 ,按照数量变化来预测未来天数藻类的培养趋势 ,… 相似文献
8.
9.
多年来,在海带人工育苗过程中时常出现烂苗或掉苗现象,给海带育苗和供苗工作造成严重威胁。引起海带幼苗脱落和腐烂的原因是多方面的,但是微生物的作用是重要的因素之一,褐藻酸降解细菌是海带的重要致病因子。 目前,海带育苗单位虽然采用某些措施,企图控制褐藻酸降解菌的发展,以期达到 相似文献
10.
11.
《African Journal of Marine Science》2013,35(4):395-406
Kelp forests along South Africa's southwest coast occur in a region of biogeographical overlap. Commonly referred to as transition-zone kelp forests, these dynamic ecosystems are particularly susceptible to grazing from species such as urchins. This study explores relationships between urchins and macroalgae in transition-zone kelp forests along the western side of False Bay. Six kelp forests in this region were sampled. At each site, the urchin Parechinus angulosus and kelp Ecklonia maxima were counted, percentage cover of understorey algae was recorded, and drift algae were collected. Despite variability in urchin and algal cover across sites, kelps generally increased from north to south, while urchins did the opposite. Urchins were negatively associated with macroalgae, although this relationship was weak. A localised threshold of 50 urchins m–2 was identified, above which kelp density failed to increase above 10 m–2 and percentage cover of understorey algae usually remained below 20%. Surprisingly, no relationship was discovered between drift algae and attached algae. The findings highlight the complexity of these cool-water environments. To better understand the role of urchins in this system, particularly under changing climate trends, experimental research into the feeding behaviour and possible effects of urchins on attached algae in the presence/absence of drift algae is advised. 相似文献
12.
用海藻磨碎液进行海湾扇贝促熟的研究 总被引：4，自引：0，他引：4
本文阐述了在海湾扇贝人工育苗中,用海藻磨碎液代替单胞藻类进行海湾扇贝促熟的研究。两年的生产实践已证明海藻磨碎液完全可替代单胞藻促使亲贝提早成熟,这将为扇贝育苗中饵料的开发利用开创了一条新途径,从而大大降低了生产成本。 相似文献
13.
龙须菜是中国重要的人工栽培海藻,主要用途是琼胶生产原料和鲍鱼饵料。目前龙须菜大规模栽培采用的是人工夹苗的方式,而其孢子采苗的生产方式也得到越来越多的关注。本文将人工培育的由四分孢子萌发长成的一对龙须菜雌、雄配子体进行受精,测试了雌雄配子体藻枝部位、温度、硝酸盐浓度等因素对果孢子体形成过程的影响,结果表明:龙须菜雌配子体藻枝的不同等级分枝表现出不同的生殖力,一级分枝最尖端新生细胞的成熟速度快于其它等级;温度对果孢子体形成有极显著影响(P<0.01),20℃为最适温度;硝酸盐浓度没有显著影响。 相似文献
14.
15.
三十烷醇乳粉在海带养殖上的应用试验 总被引：3，自引：0，他引：3
本文报道了三十烷醇乳粉在北方海带养殖中的应用。在海带苗出库时，用浓度为０．５ｐｐｍ的三十烷醇乳粉将其浸泡１２小时，或夹苗时用浓度假ｐｐｍ，将其浸泡２小时，可使海带增产２０％左右。此法低耗高效，简单易行，适宜于海带养殖中大面积推广。 相似文献
16.
17.
18.
19.
Early succession of micro‐periphyton communities in kelp bed and barren ground ecological systems 
下载免费PDF全文
下载免费PDF全文 In shallow sublittoral rocky habitats of the Southeast Pacific, two conspicuous ecological systems exist; kelp beds dominated by large Laminariales algae, and barren grounds dominated by crustose coralline algae and sea urchins. The aim of this study was to examine the successional development of micro‐periphyton communities in both ecological systems using a colonization experiment conducted in Northern Chile. In both ecological systems, we installed replicated ceramic plates at 10 m depth and samples were taken after 1, 2, 4, 6, 8 and 14 days of exposure. Bacteria, diatoms, protozoans and small eukaryotes were identified, quantified and analysed. The succession of micro‐periphyton communities in both ecological systems followed a common pattern consisting of a net accumulation of functional groups and taxa over time; however, the total density of all groups was significantly higher in the kelp beds. In addition, the community structure of the developing micro‐periphytons was different and specific for each ecological system. Although previous studies have suggested that kelp beds and barren grounds are capable of switching from one state to the other without substantial changes in biodiversity, our results show that each of these ecological systems promotes its own successional development, suggesting that they are unique, self‐organized entities. This study is the first step towards an understanding of these ecological systems operating independently at this scale of organization. 相似文献
20.
The secondary production of mobile invertebrate fauna in the Laminaria hyperborea (Gunn.) Foslie kelp forest increases with wave exposure level. This faunal group has a key function in transferring kelp carbon to higher levels in the food web. By using a size-frequency method the calculated production was 68 (±18) g D.W. m−2 yr−1 (±S.E.) at low, 250 (±57) at medium and 308 (±64) at high exposure levels. The calculations included 30 macrofauna species, which accounted for 96% of the specimens registered, with Gastropods, amphipods and bivalves being the most abundant taxa. The calculated secondary production is high, but comparable to that previously reported from other macrophyte systems and was 3%, 8% and 8% of the total primary production at low, medium and high exposure levels, respectively. Our results indicate that large quantities of Laminaria kelp are exported from the system, although the production of sessile animals was not taken into account. The most important factor in determining faunal densities and secondary production was probably habitat size but at low exposure levels the percentage of egg-carrying crustacean females and juveniles were lower than at medium and high exposure levels, thereby indicating lower fitness for animals at low exposure stations. 相似文献