干旱区生态环境知识资源中心(Arid): 具鞘微鞘藻在荒漠藻结皮形成过程中的作用

Arid

	具鞘微鞘藻在荒漠藻结皮形成过程中的作用
其他题名	The contribution of Microcoleus vaginatus to the formation of algal crust in the arid desert
	郑云普 1; 张丙昌 2; 赵建成 1; 徐明 3
来源期刊	生态学报
ISSN	1000-0933
出版年	2010
卷号	30 期号:6 页码:1655-1664
中文摘要	具鞘微鞘藻(Microcoleus vaginatus)是荒漠藻结皮主要的优势物种,在藻结皮的形成和发育过程中发挥着非常重要的作用.为了探讨具鞘微鞘藻在荒漠藻结皮形成过程中的作用,通过实验室内模拟藻结皮不同发育阶段,研究了具鞘微鞘藻在结皮形成过程中对藻类生物量、结皮厚度及其抗压强度的影响;同时利用光学显微镜和扫描电镜对藻结皮微结构观察,分析了不同发育阶段沙粒和具鞘微鞘藻之间的胶结方式和作用机理.结果表明:(1)藻结皮形成的最初阶段,结皮状态主要由细菌及小型蓝绿藻分泌胞外多糖的黏结作用和结皮表面有机质层的保护作用维持,但该阶段的藻结皮比较脆弱,抗压强度仅为(12.211.58)Pa;当具鞘微鞘藻大量出现后,逐步占据了明显的优势地位,沙粒间的黏结作用被更高强度的具鞘微鞘藻机械束缚力所取代,成为该阶段藻类结皮硬度提高的重要贡献者;(2)随着具鞘微鞘藻接种比例的逐渐增加,藻结皮中的藻类生物量、结皮厚度及抗压强度均呈现出升高的趋势(P＜0.01),当接种比例增加为80%时达到最高值;然而,当具鞘微鞘藻接种比例为100%时,各项指标却又有所下降.重点探讨藻结皮不同发育阶段沙粒间的胶结形式及微形态变化,深入揭示具鞘微鞘藻在藻结皮形成和发育过程中的作用机理,为旱生藻类广泛应用于荒漠植被恢复与重建过程提供重要的试验数据和理论依据.
英文摘要	Microcoleus vaginatus,the dominant species in the algal crust in desert regions,plays a significant role in the early development stage of the algal crust.In this study,we examined each development stage of the crusts under laboratory setup to explore the effect of different compositions of M.vag/natus on the algal biomass and crust thickness and hardness.In addition,we studied the physical interactions based on the observation of microstructure of the algal crust with the assistance of light microscopy and scanning electron microscopy,this paper analyzes the cementation style and mechanism of sand grains in different stages.We found that: (1) In the early stage of the crust development the crust was thin and fragile with a hardness of merely (12.211.58) Pa.At this stage the crust was formed by aggregating sand particles through adhesive materials which were made of extra-cellular polymeric substances,excreted by microorganisms or algae.With further development of the algal community the M.vaginatus became the dominant species and the crust was maintained mainly through the mechanical binding of filaments surrounding sand particles at this stage.As a result,the crust became thicker and stronger with a organic layer on the surface. (2) The algal biomass and the crust thickness and hardness increased with the increase of the proportion of M.vag/natus (P ＜ 0.01),with the maximum biomass and the highest crust thickness and hardness occurred at 80% of M.vaginatus in the total algal biomass.However,with further increase in the M.vaginatus proportion the algal biomass and the highest crust thickness and hardness started declining.This study provided valuable data and experimental methods for further investigating the dynamics and functions of the desert algal crust ecosystems and for desert ecosystem restoration.
中文关键词	具鞘微鞘藻 ; 藻结皮 ; 生物量 ; 厚度 ; 抗压强度 ; 微结构
英文关键词	Microcoleus vaginatus algal crust biomass thickness hardness microstructure
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:3844293
来源机构	中国科学院新疆生态与地理研究所 ; 中国科学院地理科学与资源研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/225497
作者单位	1.河北师范大学,生命科学学院, 石家庄, 河北 050016, 中国; 2.中国科学院,新疆生态与地理研究所, 乌鲁木齐, 新疆 830011, 中国; 3.中国科学院,地理科学与资源研究所, 北京 100101, 中国
推荐引用方式 GB/T 7714	郑云普,张丙昌,赵建成,等. 具鞘微鞘藻在荒漠藻结皮形成过程中的作用[J]. 中国科学院新疆生态与地理研究所, 中国科学院地理科学与资源研究所,2010,30(6):1655-1664.
APA	郑云普,张丙昌,赵建成,&徐明.(2010).具鞘微鞘藻在荒漠藻结皮形成过程中的作用.生态学报,30(6),1655-1664.
MLA	郑云普,et al."具鞘微鞘藻在荒漠藻结皮形成过程中的作用".生态学报 30.6(2010):1655-1664.