牧压梯度下冷蒿有性繁殖器官变化特征的观察分析  

The Change of Feature of the Generative Propagation of Artimisia frigida under Differents Grazing Gradients

作　　者：宝音陶格涛[1] 李艳梅[1] 贾建芬[1] 杨持[1] 

机构地区：[1]内蒙古大学生态与环境科学系,内蒙古呼和浩特010021

出　　处：《内蒙古大学学报（自然科学版）》2000年第3期311-313,共3页Journal of Inner Mongolia University：Natural Science Edition

基　　金：国家自然科学基金资助项目!( 3 9760 0 2 0 )

摘　　要：冷蒿在不同放牧压力下有性繁殖的变化 ,结果如下 :1 )单位面积上生殖枝条的数量随牧压的增加而增加 ,其中重度放牧与围栏禁牧和轻度放牧间存在着显著的差异 ;2 )随着放牧压力的增大头状花序数量显著的减少 ;3 )放牧压力对头状花序中管状花的分化以及种子的形成有显著影响 ,随牧压增大而减少 ;4 )随着放牧压力的增大冷蒿的种子生产能力降低 ,有性繁殖能力减弱 .Report to feature of the generative propagation of A.frigida under differents grazing gradients (ungrazed , lightly grazed, moderately grazed, heavily grazed) .The result are as follow:1) The amount of generative propagation branch marked increased as the graze intensity increased on per unit area. There is remark different between heavily grazed and ungrazed ,lightly grazed.2) The amount of capitulum on generative propagation branch remarkably decreased as graze intensity increased.3) The amount of tubular flower and seed in capitulum were effeted by grazing so the tubular flower and seed remarkably decreased as graze intensity increased.4) The amount of seed on per unit area decreased as graze intenity increased. The ablity of the generative propagation decline.

关 键 词：冷蒿 有性繁殖 放牧压力 结实特征 生殖枝条 

分 类 号：S812.8[农业科学—草业科学]