生长季初刈割时间对羊草群落特征的影响  

Effect of Cutting Time at Beginning of Growing Season on Characters of Leymus chinensis Community

作　　者：宋彦涛 周道玮[2] 于洋[3] 李强[2] 乌云娜 

机构地区：[1]大连民族大学环境与资源学院,辽宁大连116600 [2]中国科学院东北地理与农业生态研究所,吉林长春130102 [3]中国环境监测总站,北京100012

出　　处：《中国草地学报》2016年第3期56-62,共7页Chinese Journal of Grassland

基　　金：国家重点基础研究发展计划项目(2011CB403203);国家自然科学基金项目(31500366;31470504);中央高校基本科研业务费专项资金资助项目(DC201501070101;DC201501070402);人力资源和社会保障部2015年度留学人员科技活动择优资助项目资助

摘　　要：为了研究不同刈割起始时间对羊草种群和群落特征的影响,在我国东北松嫩草地开展了刈割控制实验。刈割起始时间间隔为10d,留茬高度2cm。结果表明:生长季初不同时间刈割对松嫩草地羊草群落特征有显著的影响。5月下旬之前刈割,为家畜提供高品质饲草的同时,对再生羊草种群和群落的产量和质量没有明显的影响,而进入6月后进行刈割不利于羊草再生,降低了羊草在群落中的竞争力和优势地位,群落组成中一年生杂草比例增加,饲草质量降低,不利于草地健康维持。但生长季初不同时间刈割,对群落功能群丰富度都没有显著影响,表明对于羊草占绝对优势的松嫩草地,植物物种丰富度对干扰的响应更敏感,在草地管理中应更关注物种丰富度而非功能群丰富度。A field study was carried out to quantify the effects of different cutting time on Leymus chinensis population and community characteristics in Songnen grassland of northeast China from 4 May to 23 June. The treatment interval was ten days with the remaining stubble height of 2 cm. The results showed that cutting at different time had a significant impact on L. chinensis community in Songnen grassland. Cutting before late May could provide high quality of forage grass for livestock,at the same time,the regrowth yield and quality of L. chinensis population and community had no significant differ-ence with the no cutting treatment. However,cutting after June would go against L. chinensis regrowth and lower the competitiveness and dominant position of L. chinensis in the community,as well as annual weeds ratio increased in the community,thus,the forage quality reduced and would be not conducive to maintain grassland health. The functional group richness of the plant communities were not significantly affected by cutting at different beginning of growing season,which declared that plant species richness re-sponse was more sensitive to disturbance in absolute dominant species of L. chinensis in Songnen grass-land,and farmers should be more focused on species richness in grassland management rather than func-tional group richness.

关 键 词：羊草 刈割时间 干草产量 质量 松嫩草地 

分 类 号：S543.9[农业科学—作物学] S812