首页|退化草原羊草种群根系形态特征对水分梯度的响应

退化草原羊草种群根系形态特征对水分梯度的响应

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分别于内蒙古锡林郭勒典型草原选取轻度退化和重度退化的草地,进行了水分梯度控制试验,研究羊草(Leymus chinensis)种群在不同退化状况下根系特征对水分资源梯度的响应.结果表明:随着水分梯度的下降,不同退化程度的草地均表现为羊草地上高度逐渐下降,而主根系长度和根系体积逐渐增加；根系面积也呈增加趋势,但只在重度退化样地与水分梯度显著负相关；根系直径呈减少趋势,但只在轻度退化样地与水分梯度显著相关.不同退化程度的草地比较,在大部分水分梯度下羊草根系特征没有显著差异,除了湿润条件下(600mm),根系面积和根系体积轻度退化草地显著高于重度退化草地(P＜0.05).干旱条件下(150mm),羊草主根系长度在重度退化草地显著高于轻度退化草地(P＜0.05).
Response of Root System of Leymus chinensis Population to Water Gradient in Degraded Grassland
Typical steppe is one of the important grassland types in North China, study on the response of root characteristics of Leymus chinensis to water gradients has important scientific significance for revealing root growth and development of steppe plants and theirs ecological stability. A lightly and a heavily degraded grassland communities were selected in Xilinguole typical steppe region of Inner Mongolia. A water gradient experiment was designed to research the response of root system characteristics of Leymus chinensis population to water gradient in degraded grassland in different degree. The results showed that with the decrease of water gradient, the height of Leymus chinensis gradually decreased while main root length and root volume increased gradually in both types of grasslands, the root surface area had an increasing trend, but only significant correlated to water gradient in heavily degraded grassland, root diameter had a decreasing trend, but only significant correlated to water gradient in lightly degraded grassland. Comparing degraded grasslands in different degree, most of root characters of Leymus chinensis had no significant difference under most water gradient, except that, under moist condition (600 mm), the root surface area and root volume in lightly degraded grassland were much higher than those in heavily degraded grassland. Under drought condition (150mm), the main root length in heavily degraded grassland was much higher than those in lightly degraded grassland.

Degraded grasslandLeymus chinensisRoot characteristicsWater gradient

洪光宇、鲍雅静、周延林、李政海、黄朔、元征征

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大连民族学院环境与资源学院,辽宁大连116600

内蒙古大学生命科学学院,内蒙古呼和浩特010021

沈阳农业大学土地与环境学院,辽宁沈阳 110866

退化草原 羊草 根系特征 水分梯度

国家自然科学基金国家自然科学基金国家环保公益性行业科研专项中央高校基本科研业务费专项资金中央高校基本科研业务费专项资金辽宁省教育厅科研项目内蒙古大学"211工程"创新人才培养项目

3077152830970494201109025-03BDC110105DC120101142L2012474

2013

中国草地学报
中国农业科学院草原研究所 中国草地学会

中国草地学报

CSTPCDCSCD北大核心
影响因子：1.347
ISSN：1673-5021
年,卷(期)：2013.35(1)
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