米氏冰草种群种子产量与种子雨的时间动态  

A preliminary study of temporal dynamics of seed rain and seed production of Agropyron michnoi population

作　　者：林海俊 王宏光[2] 金晓明[2] 刘及东[2] 闫志勇[2] 

机构地区：[1]呼伦贝尔市教育局,内蒙古呼伦贝尔021008 [2]呼伦贝尔学院生命科学与化学学院,内蒙古呼伦贝尔021008

出　　处：《草业科学》2012年第11期1731-1735,共5页Pratacultural Science

基　　金：内蒙古自治区自然科学基金项目(2010MS0509)

摘　　要：对呼伦贝尔沙化草地半固定沙地和固定沙地的米氏冰草(Agropyron michnoi)种群种子雨时间动态及有性繁殖特性进行了研究。结果表明,米氏冰草种群的种子雨时期集中在8月8日-9月22日,持续45d。米氏冰草种群种子雨强度的波动变化均与最大风速呈线性回归关系。不同生境之间,半固定沙地的米氏冰草的种子雨强度总是显著高于固定沙地。半固定沙地的米氏冰草的有性繁殖体的穗长、穗宽、单穗质量、每穗上的小穗数量及种子百粒重等均显著高于固定沙地。在半固定沙地和固定沙地种子雨数量分别占其种子产量的29%和10%。因此,沙地微生境的变化对米氏冰草种子雨散布的时期及波动规律无影响,而对其有性繁殖体的形态特征具有显著影响。The temporal dynamics of seed rain and the characteristics of sexual reproduction of Agropyron rnichnoi in the semi-fixed dune and the fixed dune of Hulun Buir desertification grassland were studied in this paper. Results showed that the seed rain of A. michnoi lasted 45 days from August 8 to September 22. There was a linear regression between the seed rain intensity fluctuation of A. michnoi and the maximum wind speed. Among different habitats, the seed rain intensity of A. rnichnoi in the semi-fixed dune was always significantly higher than that in the fixed dune. The panicle length, panicle width, per panicle weight, the number of spikelets per panicle, and 100 grain weight of sexual propagules of the semi-fixed dune were significantly higher than those of the fixed dune. The ratio of seed rain number and seed production were 29% and 10% respectively in the semi-fixed dune and the fixed dune. Sand microhabitat changes do not affect the spread period and fluctuation of A. rnichnoi seed rain, but have a significant impact on morphological features of its sexual propagules.

关 键 词：有性繁殖 种子产量 种子雨 

分 类 号：S543.9[农业科学—作物学]