The microstructure and formation of biological soil crusts in their early developmental stage
文献类型：期刊论文
| 作者 | Zhang ; YM |
| 刊名 | CHINESE SCIENCE BULLETIN
 |
| 出版日期 | 2005 |
| 卷号 | 50期号:2页码:117-121 |
| 关键词 | NEGEV DESERT NITROGEN-FIXATION TENGGER DESERT SANDY SOILS EROSION DISTURBANCE ISRAEL COVER CHINA NIGER |
| ISSN号 | 1001-6538 |
| 通讯作者 | Zhang, YM, Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Urumqi 830011, Peoples R China |
| 中文摘要 | The biological soil crust serves as one of the biological factors contributing to the sand fixation in the Gurbantunggut Desert, the largest fixed and semi-fixed desert in China. This study was conducted to investigate the microstructure and formation of biological soil crusts which develop as a result of occurrence of cryptogams. One year after removal of biological soil crusts, the exposed surface could be fixed by bacteria, which make sand particles cohere by exopolysaccharides. The exopolysaccharides were mainly composed of glucose, mannitol, arabinose and galactose. The intension of pressure for this kind of crust is 13.42 +/- 1.38 Pa. After four-year recovery of the exposed sandy surface, the biological soil crust resulting from the colonization of soil surface by communities of filamentous cyanobacteria were mainly dominated by Microcoleus, which occurred as a cluster of filaments surrounded by a gelatinous sheath. At this developmental stage, the main contributors for sand fixation were changed from bacteria to filamentous cyanobacteria. Microscopic examination of this kind of crust revealed an intricate network of filamentous cyanobacteria and extracellular polymer secretions, which binds and entraps mineral particles and finer particles on the filament surface. These effects enhance soil cohesion and resistance to erosion. The intension of pressure for this kind of crust is 32.53 +/- 0.08 Pa. |
| 学科主题 | 景观生态学 |
| 收录类别 | SCI |
| 公开日期 | 2011-08-19 |
| 源URL | [http://ir.xjlas.org/handle/365004/10530]  |
| 专题 | 新疆生态与地理研究所_中国科学院新疆生态与地理研究所(2010年以前数据) |
| 推荐引用方式 GB/T 7714 | Zhang,YM. The microstructure and formation of biological soil crusts in their early developmental stage[J]. CHINESE SCIENCE BULLETIN,2005,50(2):117-121. |
| APA | Zhang,&YM.(2005).The microstructure and formation of biological soil crusts in their early developmental stage.CHINESE SCIENCE BULLETIN,50(2),117-121. |
| MLA | Zhang,et al."The microstructure and formation of biological soil crusts in their early developmental stage".CHINESE SCIENCE BULLETIN 50.2(2005):117-121. |
入库方式： OAI收割
来源：新疆生态与地理研究所
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