干旱区生态环境知识资源中心(Arid): 腾格里沙漠人工固沙植被演替生物土壤结皮盖度对沙埋的响应

Arid

	腾格里沙漠人工固沙植被演替生物土壤结皮盖度对沙埋的响应
其他题名	Response of biological soil crust coverage to wind-blown sand burial during the succession of artificial sand-fixing vegetation in the Tengger Desert, Northern China
	赵芸 1; 贾荣亮 1; 滕嘉玲 1; 贾文雄 2; 高艳红 1
来源期刊	生态学报
ISSN	1000-0933
出版年	2017
卷号	37 期号:18 页码:6138-6148
中文摘要	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。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4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) 4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,4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4种结皮盖度随沙埋厚度增加的降低速率、D1及D2值。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。
英文摘要	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 Dl 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 Dl 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.
中文关键词	植被演替 ; 生物土壤结皮 ; 沙埋 ; 盖度 ; 粗糙度
英文关键词	vegetation succession biological soil crust sand burial coverage roughness
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:6068710
来源机构	中国科学院西北生态环境资源研究院 ; 西北师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236515
作者单位	1.中国科学院西北生态环境资源研究院, 中科院沙坡头沙漠试验研究站, 兰州, 甘肃 730000, 中国; 2.西北师范大学地理与环境科学学院, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	赵芸,贾荣亮,滕嘉玲,等. 腾格里沙漠人工固沙植被演替生物土壤结皮盖度对沙埋的响应[J]. 中国科学院西北生态环境资源研究院, 西北师范大学,2017,37(18):6138-6148.
APA	赵芸,贾荣亮,滕嘉玲,贾文雄,&高艳红.(2017).腾格里沙漠人工固沙植被演替生物土壤结皮盖度对沙埋的响应.生态学报,37(18),6138-6148.
MLA	赵芸,et al."腾格里沙漠人工固沙植被演替生物土壤结皮盖度对沙埋的响应".生态学报 37.18(2017):6138-6148.