松嫩平原返青期2种碱茅种群构件的数量特征研究

通过对朝鲜碱茅和星星草独立分蘖丛的取样调查,定量地分析了返青期松嫩平原碱化草甸2种丛生型禾草种群营养繁殖体冬眠构件的数量特征及其与无性系大小的关系。结果表明,在返青期,朝鲜碱茅的分蘖丛大小和分蘖株数量均高于星星草,其平均丛径和总分蘖数分别为星星草的2.78和3.76倍。2种群均呈以冬性植株为主的种群结构特征,冬性植株所占比例分别为64.7%和69.5%。2种群主要以冬性苗形式越冬,平均越冬率分别为73.1%和100%,同时以不定芽越冬。2种碱茅种群的冬、春性植株和总分蘖数均随其丛径的增加呈极显著的指数函数正相关(p<0.01)。随着2种群无性系丛径的增大,2无性系种群的冬、春性植株数和总分蘖数分别以1.303 90、.965 91、.171 7和0.408 50、.505 70、.367 2的指数速率增加。

Quantitative Character of Puccinellia tenuiflora and Puccinellia chinampoensis and the Relationship between the Character and the Clone Size of Two Puccinelila Populations at Reviving Stage in the Songnen Plain

Through the sample and investigation of single tufts of Puccinellia tenuiflora and Puccinellia chinampoensis,in the paper the quantitative characters of two Puccinelila populations and the relationship between the character and the clone size at reviving stage in the Songnen Plain were analyzed.The results showed that the tuft size and total tillers of P.chinampoensis population were higher than those of P.tenuiflora population.The tuft size and total tillers of P.chinampoensis were 2.78 times and 3.76 times of P.tenuiflora.The winter tillers were dominant,which were 64.7% and 69.5% in two populations.Two populations lived mainly through the winter by winterness seedlings and by buds at the same time.The rate of survival through the winter was 73.1% and 100.0%,respectively.With the increment of tuft size of two populations,the correlations between winter tillers,spring tillers and total tillers and the tuft size of two populations were very significant differences(p<0.01),and winter tillers,spring tillers and total tillers were exponentially increased by the ratios of 1.303 9,0.965 9,1.171 7 and 0.408 5,0.505 7,0.367 2,respectively.