首页关于本刊影响因子及获奖投稿须知订阅及广告专辑与专题学术会议绿色发表通道优秀论文 
说明:
此论文已被《生态学报》录用,现已优先出版,可查看文章PDF版本!
赵 芸,贾荣亮,滕嘉玲,贾文雄.腾格里沙漠人工固沙植被演替过程中生物土壤结皮盖度对沙埋的响应特征.生态学报,2017,(18).http://dx.doi.org/10.5846/stxb201606231227  
腾格里沙漠人工固沙植被演替过程中生物土壤结皮盖度对沙埋的响应特征
Response of Biological Soil Crust Coverage to Wind-blown Sand Burial During the Succession of the Artificially Sand-fixing Vegetation in the Tengger Desert, Northern China
投稿时间:2016-06-23  最后修改时间:2017-04-14
DOI: 10.5846/stxb201606231227
关键词植被演替  生物土壤结皮  沙埋  盖度  粗糙度
Key Wordsvegetation succession  biological soil crusts  sand burial  coverage  roughness
基金项目国家自然科学基金项目(41371099, 41301080, 41530746, 41671210); 中国科学院“西部之光”人才培养引进计划
作者单位E-mail
赵 芸 中国科学院西北生态环境资源研究院 zhaoyun115@mails.ucas.ac.cn 
贾荣亮 中国科学院西北生态环境资源研究院 rongliangjia@163.com 
滕嘉玲 中国科学院西北生态环境资源研究院 351003079@qq.com 
贾文雄 西北师范大学  
摘要点击次数 146
全文下载次数 31
摘要:
生物土壤结皮(简称结皮)的形成与发展是沙区固沙植被建设成功的重要标志之一,其盖度随固沙植被演替的变化趋势是表征该植被系统地表稳定性的一个直观性生态学指标。本文利用空间代时间的方法,以腾格里沙漠不同始植年代(1956、1973、1981和1987年)固沙植被区发育的四种优势结皮-真藓(Bryum argenteum Hedw.)结皮、土生对齿藓(Didymodon vinealis (Brid.) Zand.)结皮、齿肋赤藓(Syntrichia caninervis Mitt.)结皮和藻-地衣-藓类混生结皮(Mixed crust)为研究对象,在测定结皮盖度、高度以及粗糙度随沙埋厚度逐渐增加变化的基础上,计算了使结皮盖度(从99.99%)开始降低的初始沙埋厚度(D1)和盖度降低为0%的临界沙埋厚度(D2),研究了该区固沙植被演替过程中结皮盖度对沙埋厚度增加的响应特征及其相关机制。结果显示:(1) 四种结皮的盖度随沙埋厚度的增加呈logistic曲线逐渐降低。(2) 在同一年代固沙区不同种间比较,混生结皮的D1值最小,D2值最大;真藓结皮的D1和D2值均小于其他两种藓类结皮;土生对齿藓结皮和齿肋赤藓结皮因固沙年限的不同而不同,在1956年固沙区,土生对齿藓结皮 < 齿肋赤藓结皮,而在1973年固沙区和1981年固沙区,齿肋赤藓结皮 < 土生对齿藓结皮。(3) 随固沙植被演替,四种结皮盖度随沙埋厚度增加的降低速率逐渐减小,D1和D2值逐渐增大。(4) 结皮总盖度随沙埋厚度增加的降低速率逐渐减小,表明随固沙植被演替,结皮对沙埋的抵御能力逐渐增强,固沙区植被系统地表稳定性增加。(5) 结皮的粗糙度和高度随固沙植被演替逐渐增加,并显著影响了四种结皮盖度随沙埋厚度增加的降低速率、D1及D2值。本研究为全面评估沙埋对沙区结皮结构、功能的影响乃至固沙植被稳定性提供了参考。
Abstract:
In artificially constructed desert ecosystems, the formation and development of biological soil crust (hereafter crust) is one of the key indicators of successful construction of artificial sand-fixing vegetation. Importantly, with the successional progression of sand-fixing vegetation, the crust coverage undergoes substantial changes related to surface stabilities. Furthermore, surface stabilities crucially influence both the succession of sand-fixing vegetation and changes in crust coverage. Therefore, crust coverage is commonly used as a visual indicator to assess surface stability in a desert ecosystem. However, crust coverage is susceptible to sand burial (one of the common natural disturbances in desert areas) due to both its soil surface inhabitation and small stature. In order to study the characteristics and mechanisms of the response of crust coverage to sand burial during the succession of artificial sand-fixing vegetation, we used a space-replacing-time method to measure the roughness, heights, and coverage of four dominant crust types following sand burial. Furthermore, based on this, we computed the D1 value [the initial sand burial depth at which crust coverage (from 99.99%) begins to decline] and the D2 value (the threshold sand burial depth at which crust coverage declines to 0%). These crusts consist of Bryum argenteum crust, Didymodon vinealis crust, Syntrichia caninervis crust, and cyanobacteria-lichen-moss mixed crust in revegetated areas established in 1956, 1973, 1981, and 1987 at Shapotou, on the southeastern edge of the Tengger Desert. Our results show the following patterns. (1) With increasing sand depth, crust coverage declined along a logistic curve. (2) The mixed crust showed the lowest D1 value and the highest D2 value. Among the three moss-dominated crusts, the lowest D1 and D2 values were found in B. argenteum crust, whereas the D1 and D2 values of D. vinealis crust and S. caninervis crust differed depending on the history of the artificial revegetation: D. vinealis crust < S. caninervis crust at revegetated area established in 1956, and S. caninervis crust < D. vinealis crust at revegetated areas established in 1973 and 1981. (3) With successional progression of the artificial sand-fixing vegetation, the lowering rate of crust coverage gradually declined with increasing sand depth, whereas D1 and D2 values gradually increased. (4) With the development of the artificial sand-fixing vegetation, the lowering rate of crust total coverage gradually declined with increasing sand burial depth, indicating the increasing surface stabilities and ability to resist sand burial. (5) With successional progression of the artificial sand-fixing vegetation, the crust heights and roughness increased, significantly influencing the lowering rates of coverage and D1 and D2 values. In conclusion, our findings should provide strong support for future evaluation of the influence of sand burial on the structure and functions of crust, as well as the stability of artificial sand-fixing vegetation.
HTML 查看全文   查看/发表评论  下载PDF阅读器

您是本站第 56253920 位访问者

Copyright © 2005-2019   京ICP备06018880号
地址:北京海淀区双清路18号
  邮编:100085    电话:010-62941099
  E-mail : shengtaixuebao@rcees.ac.cn
本系统由北京勤云科技发展有限公司提供技术支持