干旱区生态环境知识资源中心(Arid): 羊草与大针茅根系构型对水分梯度响应的比较研究

Arid

	羊草与大针茅根系构型对水分梯度响应的比较研究
其他题名	A comparative study of the response of Leymus chinensis and Stipa grandis root characteristics to moisture gradients
	鲍雅静 1; 曹明 2; 李政海 1; 郭鹏 1; 张靖 1; 秦洁 3
来源期刊	生态学报
ISSN	1000-0933
出版年	2019
卷号	39 期号:3 页码:1063-1070
中文摘要	羊草(Leymus chinensis)与大针茅(Stipa grandis)是内蒙古锡林郭勒典型草原的两大建群种,也是内蒙古草原的重要优良牧草。选取锡林郭勒草原以大针茅和羊草为优势种的围封草场为研究样地,通过原状土柱移栽,进行了两年的水分梯度控制实验(150、300、450、600 mm),分别模拟当地年降雨量由干旱年到是湿润年的变化情况,分析比较羊草种群和大针茅种群地上高度和根系构型对水分梯度的响应情况。结果表明:相比大针茅种群,羊草种群对水分梯度的响应更敏感,随着水分梯度的增加,羊草地上高度和根系直径显著增加,根系长度和根系深度显著减少;而大针茅的地上高度和根系特征各项指标均没有显出与水分梯度的相关性,显然大针茅比羊草更能适应干旱生境。在干旱条件(模拟年降雨量150 mm处理)下,大针茅种群地上高度达到峰值,生长状况良好;羊草种群则采用地上个体小型化,地下主根变细,分叉,向土壤深层扩展的生长策略。因此,在气候变化背景下,干旱化的气候将导致大针茅种群在群落中的优势地位逐渐增加,反之羊草种群则会随着气候湿润化而占据更大的优势。
英文摘要	Leymus chinensis and Stipa grandis are two of the main species of typical grasslands of Xilingol,Inner Mongolia, and are important forage grasses. An enclosed grassland, with L. chinensis and S. grandis as the dominant species, in Xilingol was selected as the research area, and moisture gradient control experiments (150, 300,450,600 mm) were carried out over two years by transplanting the original soil column,to simulate changes of local annual rainfall from drought to wet years,and the response of plant height and root architecture of L. chinensis and S. grandis populations were analyzed and compared under the different moisture gradients. The results showed that the response of L. chinensis populations was more sensitive to moisture gradients than that of S. grandis. With increasing moisture gradients, the plant height and root diameter of L. chinensis increased, whereas the root length and depth decreased significantly ((P<0.05). However, for S. grandis,the indicators of root architecture and plant height showed no correlation with the moisture gradient. Therefore, S. grandis could adapt to arid habitats more effectively than L. chinensis,and under drought conditions (simulated rainfall of 150 mm) the plant height of S. grandis populations reached a peak value and grew efficiently, whereas L. chinensis populations adopted a growth strategy of individual miniaturization,with thinner taproots and bifurcation to extend to the deep soil. Therefore, with climate change, a drying climate will result in increased S. grandis populations as the dominant species in the community, and L. chinensis populations will have a greater advantage in wetter climates.
中文关键词	羊草 ; 大针茅 ; 根系特征 ; 水分梯度
英文关键词	Leymus chinensis Stipa grandis root characteristics moisture gradient
语种	中文
国家	中国
收录类别	CSCD
WOS类目	BIOLOGY
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:6419045
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/2XILL650/239405
作者单位	1.大连民族大学环境与资源学院, 大连, 辽宁 116600, 中国; 2.大连民族大学环境与资源学院;;东北师范大学生命科学学院, ;;, 大连;;长春, ;; 116600;;130000; 3.内蒙古农业大学草原与资源环境学院, 呼和浩特, 内蒙古 010021, 中国
推荐引用方式 GB/T 7714	鲍雅静,曹明,李政海,等. 羊草与大针茅根系构型对水分梯度响应的比较研究[J]. 内蒙古农业大学,2019,39(3):1063-1070.
APA	鲍雅静,曹明,李政海,郭鹏,张靖,&秦洁.(2019).羊草与大针茅根系构型对水分梯度响应的比较研究.生态学报,39(3),1063-1070.
MLA	鲍雅静,et al."羊草与大针茅根系构型对水分梯度响应的比较研究".生态学报 39.3(2019):1063-1070.