不同利用方式对松嫩草地两种禾草种群构件特征的影响  

Effects of Different Utilization Modes on Module Characteristics of Two Grass Populations in the Songnen Grassland

作　　者：刘志扩 丰吉 李海燕[1] 杨允菲[1] 郭健 LIU Zhi-kuo;FENG Ji;LI Hai-yan;YANG Yun-fei;GUO Jian(Institute of Grassland Science,Northeast Normal University/Key Laboratory of Vegetation Ecology,Ministry of Education/Jilin Songnen Grassland Ecosystem National Observation and Research Station,Changchun 130024,China;School of Environmental Engineering,Xuzhou University of Technology,Xuzhou 221018,China)

机构地区：[1]东北师范大学草地科学研究所/植被生态科学教育部重点实验室/吉林松嫩草地生态系统国家野外科学观测研究站,吉林长春130024 [2]徐州工程学院环境工程学院,江苏徐州221018

出　　处：《中国草地学报》2022年第12期11-18,共8页Chinese Journal of Grassland

基　　金：国家自然科学基金项目(32171682,31670427,32201477);吉林省科技厅自然科学基金项目(20220101290JC);“111”引智基地项目(B16011)资助

摘　　要：通过对长期刈割和围栏封育下松嫩草地常见优势种羊草(Leymus chinensis)和伴生种野古草(Arundinella hirta)种群构件特征进行比较分析,结果表明:长期刈割和围栏封育下,羊草和野古草分株呈增长型年龄结构,根茎呈稳定型或增长型年龄结构。两种植物低龄级的分株和根茎的物质生产与贮藏能力更强。长期刈割下,羊草2龄、3龄分株数量和总分株数量以及1龄、2龄、3龄根茎长度和总根茎长度显著高于野古草;围栏封育下,野古草1龄和总的分株数量和生物量显著高于羊草。长期刈割促进羊草各龄级分株的产生,促进1龄根茎的伸长,显著降低根茎的生物量积累;显著降低野古草各龄级分株数量以及根茎的伸长和生物量积累。羊草根茎的扩展能力远高于野古草,羊草比野古草耐刈割,刈割后种群恢复能力高于野古草。In this study,a comparative analysis was conducted to characterize the module of dominant species Leymus chinensis and its common companion species Arundinella hirta under long-term mowing and enclosure conditions in the Songnen grassland.The results showed that under different utilization modes,the tillers of L.chinensis and A.hirta exhibited an expanding age structure,and the rhizomes revealed a stable or expanding age structure.The tillers and rhizomes of the younger age classes of the two grasses had greater productivity and storage capacity.Under the long-term mowing treatment,the number of tillers at the 2nd and 3rd age classes and the total tillers of L.chinensis were significantly higher than that of A.hirta,and the length of rhizomes at the 1st,2nd and 3rd age classes and the length of total rhizomes of L.chinensis were also significantly higher than that of A.hirta.Under the enclosure treatment,the number and biomass of tillers at the 1st age class and the total tillers of A.hirta were significantly higher than that of L.chinensis.Long-term mowing promoted the production of L.chinensis tillers at different ages classe and the elongation of rhizome at the lst age calss,reduced the biomass accumulation of rhizomes of L.chinensis,and inhibited A.hirta tiller number at different age classes and production and growth of rhizome.In conclusion,the expansion ability of L.chinensis was much higher than that of A.hirta.L.chinensis was more resistant to mowing and had a stronger capacity for population recovery after mowing.

关 键 词：刈割 围栏封育 年龄结构 无性系草本 分蘖株 根茎 

分 类 号：S812[农业科学—草业科学]