松嫩平原赖草无性系构件的形成与空间扩展实验  

Growth of modules and survival space enlargement of Leymus secalimus clones under cultivated conditions in Songnen Plain of Northeast China: An experimental research.

作　　者：杨允菲[1] 张宝田[1] 张春华[2] 

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,长春130024 [2]黑龙江畜牧兽医职业学院,黑龙江双城150111

出　　处：《应用生态学报》2007年第5期977-982,共6页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金资助项目(30470272;30270260).

摘　　要：在松嫩平原栽培条件下,赖草无性系生长的可塑性较大.在移植当年,赖草经过153d的生长,4个无性系中最大的为215个分蘖株,是最小(40个)分蘖株的5.4倍,均遵循着相同的指数生长规律.在2个年度8个赖草无性系样本中,其分蘖株、根茎和芽3种构件之间数量与生物量以及3种构件的数量特征与无性系空间大小的变化均有较好的规律性.赖草分蘖株数量与直径之间为幂函数异速生长;分蘖株和根茎生物量及芽数与直径之间均为指数异速生长;分蘖株及根茎的数量和生物量与所占面积之间均为线性同速生长.在具有充分生长空间且没有种间竞争条件下,赖草无性系采用先生存后发展的构件生长策略,并充分发挥无性系的持续更新潜力.Leymus secalimus is a kind of rhizome grass and a species of typical clonal plant. The study showed that under cultivated conditions in the Songuen Plain of Northeast China, the growth of four test L. secalirnus clones is with great plasticity. After 153 days of growth in the year of transplanting, the clones had 215 tillers in maximum and 40 tillers in minimum, and the growth pattern accorded with exponential function. The number and biomass of the tillers, rhizomes and buds, as well as the variations of their quantitative characters and of the survival space of the clones in two growth seasons all presented good regularity. The tillers number was in a power allometry growth with the increase of clonal diameter, and the biomass of tillers and rhizomes as well as the number of buds were all in an exponential allometry growth with the increase of the diameter. The number and biomass of the tillers and rhizomes were all in a linear isogony growth with increasing survival space of the clones. When the space was enough and no interspecies competition existed, L. secalirnus clones survived first and developed then, and well exercised continuing updating potency.

关 键 词：赖草 构件 分蘖株 根茎 芽 无性系生长 

分 类 号：S543.9[农业科学—作物学]