干旱区生态环境知识资源中心(Arid): 锦鸡儿林草带状复合系统细根空间分异特征

Arid

	锦鸡儿林草带状复合系统细根空间分异特征
其他题名	Spatial Distribution of Caragana spp．Fine Root in Alley Silvopasture Systems
	秦树高; 吴斌; 张宇清; 张天勇
来源期刊	林业科学
ISSN	1001-7488
出版年	2011
卷号	47 期号:7 页码:42-49
中文摘要	以立地条件基本相同、林带完好、长势均匀的两行一带锦鸡儿林草带状复合系统(带距分别为4,6,8 m)为研究对象,采用壕沟法对锦鸡儿根系进行分层挖掘取样,研究其在不同造林带距条件下的空间分异特征。研究显示:锦鸡儿根系生物量在水平方向上多靠近林带分布,与6 m和8 m带距系统相比,4 m带距系统林地中部锦鸡儿根系生物量密度相对较高。锦鸡儿在林地中部土体的细根根长和表面积密度随带距增大而减小;带距分别为 4,6,8 m的系统中,锦鸡儿在4 m带距系统整个样地土体中细根根长和表面积密度均处于相对较高的水平;而随带距增大,在0～40 cm土层中,锦鸡儿平均细根根长密度、细根长度累计百分比、平均细根表面积密度和细根表面积累计百分比均呈减小趋势。因此,与4 m和6 m带距系统相比,在8 m带距系统中,锦鸡儿细根较少地分布于表土层和林地中部土体中,林草主要资源利用层发生隔离,而且林地两侧锦鸡儿根系在林地中部较少发生接触,使得林草种间竞争和锦鸡儿种内竞争较为缓和;同时8 m带距系统仍可有效防止林地发生风蚀,所以在我国西北干旱半干旱地区进行锦鸡儿林草带状复合系统建设时,采用8 m带距较为适宜。
英文摘要	Our objectives were to investigate fine root spatial distribution of Caragana spp．in three alley silvopasture systems which are composed of one shrub belt and two-rows with different belt distance(4,6,8 m)．The three systems had intact structure and uniform growth status in similar sites．The roots were sampled by the way of excavation from one soil layer to another vertically,on the woodland soil profile．The results showed that root biomass(RB)of Caragana spp． concentrated near the shrubs,Caragana spp．root biomass density(RBD)of 4 m system was markedly greater than that of 6 m and 8 m systems in central soil of woodland．The results also showed that,Caragana spp．fine root length density (FRLD)and fine root surface area density(FRSAD)in whole woodland of 4 m system were greater than that in 6 m and 8 m systems．In the three systems,average FRLD and FRSAD,cumulate percents of fine root length and surface area in 0-40 cm soil,FRLD and FRSAD in central soil,all decreased as belt distance of systems increasing．In 8 m system,root concentrated layers were separated between Caragana spp．and herbaceous,and fewer Caragana spp．roots were superposed in central soil,because of fewer fine roots of Caragana spp．in topsoil and central soil than that in other systems．Consequently,interspecies competition between Caragana spp．and herbage,and intraspecies competition of Caragana spp,were more mitigative in 8 m system,than in other systems．It suggests that Caragana spp．alley silvopasture system with 8 m belt distance is comparatively feasible,in semi-arid areas of northwestern China．
中文关键词	林草复合系统 ; 锦鸡儿 ; 细根 ; 根系空间分异 ; 竞争
英文关键词	silvopasture system Caragana spp. fine root root spatial distribution competition
类型	Article
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:4330330
来源机构	北京林业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/226771
作者单位	秦树高, 北京林业大学水土保持学院, 北京 100083, 中国.; 吴斌, 北京林业大学水土保持学院, 北京 100083, 中国.; 张宇清, 北京林业大学水土保持学院, 北京 100083, 中国.; 张天勇, 宁夏盐池县环境保护与林业局, 盐池, 宁夏 751500, 中国.
推荐引用方式 GB/T 7714	秦树高,吴斌,张宇清,等. 锦鸡儿林草带状复合系统细根空间分异特征[J]. 北京林业大学,2011,47(7):42-49.
APA	秦树高,吴斌,张宇清,&张天勇.(2011).锦鸡儿林草带状复合系统细根空间分异特征.林业科学,47(7),42-49.
MLA	秦树高,et al."锦鸡儿林草带状复合系统细根空间分异特征".林业科学 47.7(2011):42-49.