毛乌素沙地不同飞播年限杨柴根系分布特征  

Root distribution characteristics of Hedysarum laeve with different aerial seeding years in Mu Us Sandy Land

作　　者：张雷[1,2] 王晓江[2] 洪光宇[2] 武永智[2] 李卓凡[2] 海龙[2] 王平平[2] 高孝威[2] 杨劼[1] 

机构地区：[1]内蒙古大学生命科学学院,呼和浩特010021 [2]内蒙古自治区林业科学研究院,呼和浩特010010

出　　处：《生态学杂志》2017年第1期29-34,共6页Chinese Journal of Ecology

基　　金：国家林业公益性行业科研专项(201304206);内蒙古自治区自然科学基金项目(2014MS0313)资助

摘　　要：以毛乌素沙地不同飞播年限杨柴(Hedysarum laeve)灌木林为研究对象,采用样方挖掘法分坡位获得不同深度的杨柴根系生物量和根茎数量,分析了不同飞播年限和不同坡位杨柴的根系分布特征。结果表明:随着飞播年限的增加,杨柴的重要值降低,油蒿(Artenisia ordosica)的重要值持续增加,杨柴有被油蒿取代的趋势,而草本层多样性指数均表现出增加的趋势;随着飞播年限的增加,杨柴根冠比逐渐降低,飞播13、29和37 a样地分别为3.24、1.87和1.32;杨柴的根系生物量和根茎数量均随着土壤深度和飞播年限的增加呈明显的下降趋势;同时,杨柴根系生物量和根茎数量随着坡位的下降呈现出增加的趋势,坡下显著高于坡上和坡中;杨柴根系绝大部分分布在0~40 cm,并且随着飞播年限的增加和坡位的下降,根茎分布更趋于表面化。Taking Hedysarum laeve shrubs with different aerial seeding durations in the Mu Us Sandy Land as the study object,we investigated the root biomass and rhizome numbers of H. laeve at different soil depths using the quadrat mining method to analyze the distribution pattern of H.laeve roots. The results showed that with the increase of aerial seeding duration,the importance value of H. laeve decreased,while the importance value of Artemisia ordosica increased,indicating a trend of H. laeve being replaced by A. ordosica. With the increase of aerial seeding duration,root-shoot ratio of H. laeve decreased,and the value was 3.24,1.87 and 1.32 for 13,29 and 37 years aerial seeding plots,respectively. Root biomass and rhizome numbers of H. laeve at different aerial seeding durations significantly decreased with soil depth and aerial seeding duration. Root biomass and rhizome numbers of H. laeve increased with the decrease of slope position.Most roots of H. laeve distributed in 0-40 cm,and root distribution tended to be more close to the ground surface with the increase of aerial seeding duration and the decrease of slope position.

关 键 词：杨柴 根冠比 根系生物量 根茎数量 坡位 毛乌素沙地 

分 类 号：Q948[生物学—植物学]