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	不同植物灌丛沙丘表面沉积物粒度变化及其固沙能力
其他题名	Sediments particle size changes and its sand fixation ability for different shrub dunes
	高永1 ; 丁延龙 1; 汪季 2; 蒙仲举 1; 孙晓瑞 1; 张超 1; 魏亚娟 1
来源期刊	农业工程学报
ISSN	1002-6819
出版年	2017
卷号	33 期号:22 页码:135-142
中文摘要	研究沙区不同类型植物灌丛沙丘地表沉积物环境敏感粒度组分体积百分含量变化及其影响因素有助于精确描述地表风沙运动过程,为快速比较不同植物种固沙能力和沙区植被恢复提供参考。采用激光衍射法对乌兰布和沙漠内部5种荒漠植物灌丛沙丘地表沉积物粒度差异进行测定,以粒级-标准偏差法对风沙环境敏感组分进行提取,根据敏感组分体积百分含量变化对植物固沙能力进行评价,并以多元线性回归方法拟合了敏感组分体积百分含量对植株形态指标变化的响应。结果表明:沙鞭、沙蓬、芦苇样地表层沙物质分布同裸沙丘均为单峰型,白刺和油蒿为双峰型。植被分布区沙丘表层沉积物中沙、细沙减少,极细沙和粉粒增加,沉积物颗粒分选性变差,频率曲线趋于正偏,峰度值降低。整体而言,颗粒组成由细到粗依次为:白刺>油蒿>芦苇>沙蓬>沙鞭>裸沙丘。乌兰布和沙漠地表沉积物存在1.45~76和76~456 mum 2个环境敏感粒度组分,中值分别为57.3和193.6 mum,分别命名为细组分和粗组分,细组分对应风沙流中的悬移质,粗组分为跃移质。环境敏感组分在各植物覆盖下差异显著,细组分体积百分含量变化为:白刺>油蒿>沙蓬>芦苇>沙鞭>裸沙丘,粗组分体积百分含量变化相反,植株对风动力的阻滞能力相应降低。多元线性回归显示,细组分体积百分含量与株高、冠幅、分枝数呈正相关关系,与疏透度呈负相关关系,表层沉积物中细组分体积百分含量越高的植物灌丛,影响其体积百分含量多少的因素越复杂。
英文摘要	Land desertification is a major global ecological problem that affects sustainable development of human society. Flow sand dunes are the main source of aeolian sand-dust transport in the surface layer, which causes enormous losses in many arid and semi-arid regions of the world. Aeolian dust transport processes are closely related to the variation of the surface vegetation cover. Therefore, it is necessary to screen plants with strong sand fixability to control the expansion of desert. The Ulan Buh Desert is one of the fastest developing areas of desertification in China. In this study, we aimed to investigate the changes of environmental sensitive particle components and factors affecting vegetation coverage, which would help to describe the process of surface sand movement accurately, and to compare abilities of different plant species to stabilize sand and provide reference for vegetation restoration in the area. The surface(0-2 cm) sediment particle size of five kinds of desert shrub dunes in desert-oasis ecotone at the northeast rim of the Ulan Buh Desert was measured by the laser diffraction method. The eolian environment sensitive grain size components were extracted by grain size class-standard deviation method. Then the sand stability capacity of plants was evaluated according to the changes of sensitive components. And the response of sensitive components to the changes of plant morphological indexes was fitted by multiple linear regression method. The results indicated that the frequency distribution curves of surface sediment under Psammochloa villosa, Agriophyllum squarrosum, Phragmites australis coverage and flow sand dune were single peak type, while under Artemisia blepharolepis and Nitraria tangutorum coverage, they were double-peak type. When the surface was covered by vegetation, the content of fine sand and middle sand reduced, while very fine sand and silt increased, the sorting became worse, the skewness deviated from normal distribution and turned to partially positive, and the kurtosis were decreased. The vegetation under which particle composition ranged from fine to coarse was as follows: Nitraria tangutorum> Artemisia blepharolepis > Phragmites australis > Agriophyllum squarrosum > Psammochloa villosa > flow sand dune. There were two sensitive grain size components of 1.45-76 and 76-456 mum in Ulan Buh Desert, named as fine sensitive components and coarse sensitive components, while the median diameter of two kinds of environment-sensitive particle size components were 57.3 and 193.6 mum, respectively. The fine sensitive components correspond to the suspended load in the sand drift activity, while the coarse sensitive components correspond to the saltation load. The contents of sensitive components were significantly(P<0.05) different under the coverage of each desert shrub. The content of fine components of different shrub dunes were as follows: Nitraria tangutorum> Artemisia blepharolepis > Agriophyllum squarrosum >Phragmites australis > Psammochloa villosa > flow sand dune. At the same time, the content of coarse grain size components showed the opposite law, which meant the ability of five kinds of desert plants to weaken wind erosion was correspondingly reduced. Multiple linear regression analysis showed that the content of fine components was positively correlated with plant height, crown width and branch number, and negatively correlated with porosity of what?(sand dune or plant cover?). With the increasing of the content of fine components in surface sediments, the cause also became complicated.
中文关键词	土壤 ; 沉积 ; 粒度 ; 灌丛沙丘 ; 固沙能力 ; 粒级-标准偏差法 ; 敏感粒度组分 ; 乌兰布和沙漠
英文关键词	soils sedimentation particle size shurb dunes sand fixation capacity grain size class-standard deviation method sensitive grain size components Ulan Buh desert
语种	中文
国家	中国
收录类别	CSCD
WOS类目	FORESTRY
WOS研究方向	Forestry
CSCD记录号	CSCD:6129228
来源机构	内蒙古农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236336
作者单位	1.内蒙古农业大学沙漠治理学院, 呼和浩特, 内蒙古 010018, 中国; 2.内蒙古农业大学沙漠治理学院, 内蒙古杭锦荒漠生态系统国家定位观测研究站, 呼和浩特, 内蒙古 010018, 中国
推荐引用方式 GB/T 7714	高永,丁延龙,汪季,等. 不同植物灌丛沙丘表面沉积物粒度变化及其固沙能力[J]. 内蒙古农业大学,2017,33(22):135-142.
APA	高永.,丁延龙.,汪季.,蒙仲举.,孙晓瑞.,...&魏亚娟.(2017).不同植物灌丛沙丘表面沉积物粒度变化及其固沙能力.农业工程学报,33(22),135-142.
MLA	高永,et al."不同植物灌丛沙丘表面沉积物粒度变化及其固沙能力".农业工程学报 33.22(2017):135-142.