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利用MODIS和RADARSAT数据对浒苔的监测研究 总被引：1，自引：0，他引：1
浒苔是一种大型的浮游性海藻,它的爆发给环境造成了很大的影响。本文介绍了利用EOS/MODIS和RADARSAT遥感数据探测2008-2009年发生在黄海及邻近海域(119°E~122°E,34°N~36°30′N之间)的浒苔灾害的研究。本研究首先利用MODIS传感器的1、2波段计算了相应海域的NDVI。在云层较厚的情况下结合RADARSAT图像来辅助判定大型浮游藻类的信息。并计算了长时间序列NDVI,利用阀值分割法计算了浒苔爆发的面积信息,利用ARCVIEW工具对长时间序列的浒苔分布的矢量信息进行处理,得到了浒苔的漂浮路线,起源。初步研究了MODIS监测浒苔的可行性,讨论了浒苔的爆发可能对渔业资源造成的潜在影响。 相似文献
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Combining some information from field investigation of algae along the coastal areas in China and a few pictures materialized from the western Yellow Sea in 2008,authors analyze the necessary conditions and possible water area in China producing a large biomass,some reasons for firestorm,and the possibility of the reappearance of marine bloom green alga Enteromorpha prolifera.The change of habitats and the increase of nutritional levels related to the water area could be considered as direct reasons.It was ... 相似文献
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Extremely large accumulation of green algae Enteromorpha prolifera floated along China’coastal region of the Yellow Sea ever since the summer of 2008.Amplified Fragment Length Polymorphism (AFLP) analysis was applied to assess the genetic diversity and relationships among E. prolifera samples collected from 9 affected areas of the Yellow Sea.Two hundred reproducible fragments were generated with 8 AFLP primer combinations,of which 194 (97%) were polymorphic. The average Nei’s genetic diversity, the coefficiency of genetic differentiation (Gst), and the average gene flow estimated from Gst in the 9 populations were 0.4018, 0.6404 and 0.2807 respectively. Cluster analysis based on the unweighed pair group method with arithmetic averages (UPGMA) showed that the genetic relationships within one population or among different populations were all related to their collecting locations and sampling time. Large genetic differentiation was detected among the populations.The E. prolifera originated from different areas and were undergoing a course of mixing. 相似文献
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基于Himawari-8气象卫星数据,研究了利用归一化植被指数提取浒苔信息方法,并提出了浒苔强度和移动速度估算方法。对2016年5-7月黄海海域浒苔信息进行监测,获得了浒苔暴发的时间、地点、面积、强度、影响范围、漂移路径及移动速度。结果表明:2016年5月19日Himawari-8气象卫星首次监测到黄海海域出现浒苔信息;6月中下旬进入暴发期,浒苔面积、影响范围及强度达到最大值;7月上旬,伴随着浒苔大面积登陆青岛、烟台、威海等地,浒苔进入缓慢消亡阶段。多时次浒苔强度合成产品显示:2016年浒苔在黄海中部海域、烟台以东海域覆盖强度较大,在初始位置一带覆盖强度较小。浒苔漂移路径整体为从东南外海逐渐开始向西北近海海域靠近,日移动速度不断变化。浒苔的动态变化与水文气象环境密切相关,适宜的温度是浒苔生长和发展的基础,浒苔出现后,盛行风向是浒苔漂移方向的主要驱动力,2016年5-7月强劲的南风使浒苔一直向北漂移,并最终抵达威海,浒苔的移动与风向大致相同。 相似文献
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青岛海域浒苔中挥发油成分分析 总被引：1，自引：1，他引：0
将青岛海域采集的浒苔在挥发油测定器中通过水蒸气蒸馏法提取,用 GC/MS 进行分离和检测,得到35种化合物。采用色谱峰面积归一法在MSD化学工作站下进行数据处理得到相对含量,其中主要成分及其含量为：棕榈酸(hexadecanoic acid,29.676%),顺-9,12,15-十八碳三烯-1-醇(9,12,15- Oc-tadecatrien-1-ol,(ZZZ)-,6.957%),鲨烯(Squalene ,5.567%),顺-11-十六碳烯酸(Z-11-Hexadecenoic acid ,4.494%),顺-7-十六碳烯酸(Z-7-Hexadecenoic acid,3.997%),9,12-十八碳二烯酸甲酯(9,12-Octade-cadienoic acid, methyl ester ,3.144%),十七碳酸(Heptadecanoic acid ,2.827%),邻苯二甲酸双庚酯(1,2-Benzenedicarboxylic acid, diheptyl ester,2.531%),二十碳烷(Eicosane,2.483%),十六碳酸甲酯(Hexadecanoic acid, methyl ester,2.468%),异植醇(Isophytol,2.183%),邻苯二甲酸单(2-乙基己基)酯(1,2-Benzenedicarboxylic acid, mono(2-ethylhexyl) ester,1.885%),油酸(Oleic acid,1.479%),14-甲基十七酸甲酯(Heptadecanoic acid,14-methyl-, methyl ester,1.473%)。这35种化合物占总检出量的82.199%。 相似文献
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在添加浒苔和紫菜干体的条件下,通过测定藻细胞数量,观察藻细胞形态,分析海藻干体对米氏凯伦藻、中肋骨条藻和塔玛亚历山大藻的半抑制和完全抑制浓度以及半抑制和完全抑制浓度有效作用的起始藻细胞数量范围,研究了浒苔和紫菜干体对3种赤潮微藻生长的影响.在此基础上,设定海藻干体的添加量为其完全抑制浓度,通过监测微藻培养液中总氮(硝酸态氮、氨态氮和亚硝酸态氮)和总磷等变化,分析海藻干体添加对培养液营养化程度的影响.结果表明:(1)当浒苔和紫菜干体浓度分别大于0.8 g/L 和1.0 g/L 时,海藻干体能显著抑制3种赤潮微藻的生长,它们对赤潮微藻的生长抑制率超过60%(第12 d).(2)浒苔和紫菜干体对3种实验微藻的半抑制浓度(IC50)接近,在0.71~1.22 g/L 之间;但完全抑制浓度(IC10)差别较大,浒苔干体对3种赤潮微藻的完全抑制浓度在2.4~2.8 g/L 范围,其数值约为紫菜干体对它们的完全抑制浓度的2倍.(3)3种赤潮微藻起始藻细胞数量不超过40伊104·mL-1(对于米氏凯伦藻和中肋骨条藻来说,起始藻细胞数量可增大至60伊104·mL-1),海藻干体对3种实验微藻的半抑制浓度和完全抑制浓度均有效.(4)添加海藻干体的实验组培养液中总氮和总磷含量均明显高于对照培养液中总氮和总磷含量.其中,实验组培养液中总氮浓度为382滋g/L,总磷浓度明显低于100滋g/L.综上所述,浒苔和紫菜干体具有强烈的抑藻作用,且不会造成培养液营养加剧现象,可尝试应用于赤潮微藻的控制与治理中. 相似文献
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The rbcL gene of Ulva pertusa,Enteromorpha prolifera and Monostroma grevillei was amplified,sequenced and analyzed.By comparing the rbcL sequences with seven other Ulvales species retrieved from GenBank,the sequence divergences and the phyletic evolution were analyzed and the phylogenetic tree was constructed.From the phylogenetic tree,it can be found that U.pertusa,E.prolifera and U.californica group in one branch,while E.compressa,U.rigida and U.fenestrata cluster in another clade.Obviously,unlike the Enteomorpha species,the Ulva species do not gather in one branch.Therefore Ulva and Enteomorpha might be affiliates of one genus.E.compressa and E.intestinalis gathered together,which coincided with the morphological characters.However,the thallus of U.pertusa is thick and with many holes,which is different from E.prolifera in morphology.They cluster together in the phylogenetic tree with a genetic distance of 0.005.The results indicate that Ulva and Enteromorpha are not distinguished strictly. 相似文献
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