干旱区生态环境知识资源中心(Arid): 风力胁迫对具鞘微鞘藻结皮光合活性的影响

Arid

	风力胁迫对具鞘微鞘藻结皮光合活性的影响
其他题名	EFFECT OF WIND STRESS ON PHOTOSYNTHETIC ACTIVITY OF MICROCOLEUS VAGINATUS CRUSTS
	徐娟娟; 张德禄; 吴国樵; 王高鸿; 刘永定; 胡春香
来源期刊	水生生物学报
ISSN	1000-3207
出版年	2010
卷号	34 期号:3 页码:575-581
中文摘要	抵抗风力胁迫是荒漠藻类适应干旱区环境的重要生物学机制,也是藻结皮能够拓殖流沙的必要条件之一,但有关藻类对风力胁迫的响应机理国内外尚无研究报道. 以具鞘微鞘藻(Microcoleus vaginatus Gom.)人工结皮为实验对象,研究了不同强度风力吹蚀对结皮含水量、藻类活力、生物量、及其光合活性的影响. 结果表明:不论低于当地起沙风(3 m/s)还是高于起沙风(5 m/s和7 m/s)的风力吹蚀,结皮中藻类生物量均明显下降,而且结皮生物量的变化与风速大小和吹蚀时间呈线性关系(y=14.78+0.035a-1.48b,a风速,b时间, r~2=0.79). 进一步分析发现,风力吹蚀后结皮中藻类活力并没有降低但主要光合色素和天线色素的含量普遍降低,叶绿素荧光(Fv/Fm)、表观电子传递速率(ETR)和净光合速率(Pn)明显下降,并且风速越大,降幅越大. 这些结果说明风力胁迫对藻结皮生长和光合活性的影响主要是通过影响光合色素代谢合成和电子传递速率引起的,对其生命力没有明显影响
英文摘要	Algal crusts are the early stage of biological soil crusts development and succession in the arid and semi-arid regions,in which filamentous cyanobacteria are often dominant organisms, and these algae have been recognized to possess importance functions both in the stabilization of topsoil, retarding water evaporation, meliorating soil structure, and enhancing soil fertility. Of course, the environments they grow and survive determine that they are often subjected to harsh environmental conditions, such as windy, arid, sunny irradiation and extreme temperature fluctuation. Accordingly these organisms have developed variable strategies to adapt them. Up to data, their adaptation to drought, radiation and salt stress have been studied extensively, but few is done for wind force stress, and very little is known about its acclimation to this stress. Microcoleus vaginatus is the first dominant species and community-building species of more than 95%algal crusts on the world, with the most promising foreground in desertification control and application of algal crusts. The objective of this study is to explore the effects of wind stress on photosynthetic activity of M.vaginatus crusts. In this study,M.vaginatus isolated from Qubqi Desert was batch cultured, and inoculated onto the surface of local shifting sand in laboratory. After the algal crusts formation, they were taken to the outdoors for stress exercise for 10 days from 9:00 to 12:00 everyday. Then the man-made M.vaginatus crusts were exposed to different scales wind forces environments(3m/s,5m/s and 7m/s), algal physiological responses were in situ studied. The results showed that alga biomass decreased significantly under windy conditions,it was significantly negatively correlated with blowing time, but positively correlated with wind force scale(y=14.78-1.48a+0.035b,a blowing time,b wind force,r2=0.79). After 7 hours continuous blowing at different scales wind forces, the main photosynthetic pigments and antenna pigments contents, chlorophyll fluorescence(Fv/Fm), the apparent electron transfer rate(ETR)and net photosynthetic rate (Pn)decreased significantly, and the greater drop occurred at the stronger wind force. Above results indicated that wind force stressed algal growth and photosynthetic activity by impacting metabolism of pigments and photosynthetic electron transport rate, but algal cell vitality was not affected obviously
中文关键词	风力胁迫 ; 具鞘微鞘藻 ; 光合色素 ; 细胞活力 ; 叶绿素荧光 ; 净光合速率
英文关键词	Wind stress Microcoleus vaginatus Photosynthetic pigments Cell vitality Fv/Fm Pn
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ECOLOGY
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:3949263
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/225611
作者单位	中国科学院水生生物研究所, 武汉, 湖北 430072, 中国
推荐引用方式 GB/T 7714	徐娟娟,张德禄,吴国樵,等. 风力胁迫对具鞘微鞘藻结皮光合活性的影响[J],2010,34(3):575-581.
APA	徐娟娟,张德禄,吴国樵,王高鸿,刘永定,&胡春香.(2010).风力胁迫对具鞘微鞘藻结皮光合活性的影响.水生生物学报,34(3),575-581.
MLA	徐娟娟,et al."风力胁迫对具鞘微鞘藻结皮光合活性的影响".水生生物学报 34.3(2010):575-581.