海拔对钝裂银莲花不同花色居群间繁殖特征及繁殖分配的影响

Influence of altitude on reproductive traits and reproductive allocation of different colours in Anemone obtusiloba populations

通过野外采样对青藏高原东部高寒草甸4个海拔梯度间3种花色钝裂银莲花的繁殖性状和繁殖分配进行了研究。结果发现:1)3种花色钝裂银莲花对花和茎的投入比例均随着海拔的升高而增大,叶的投入比例均随着海拔的升高而减少。2)3种花色钝裂银莲花的花数目均随着海拔升高而减少;单花面积和单花重均随着海拔升高极显著增大;花展示面积、繁殖投入和繁殖分配随着海拔升高而增大。3)不同海拔梯度下,同花色钝裂银莲花其个体大小与花数目、单花重、花展示面积及繁殖投入均呈极显著正相关,与单花面积均呈显著正相关,且海拔直接对这些繁殖特征产生了影响;同一花色钝裂银莲花的个体大小与繁殖分配间均无固定模式。研究表明,海拔对不同花色钝裂银莲花的繁殖特征和繁殖分配有着重要的影响,且不同花色钝裂银莲花繁殖特征和繁殖分配对海拔的升高均做出了提高繁殖适合度的适应性调整,但海拔并不是影响钝裂银莲花繁殖策略的唯一因子。

Reproductive traits and reproductive allocation of three colours in Anemone obtusiloba at four different altitudinal gradients in the eastern Qinghai-Tibetan Plateau were examined.1） With increased altitude,the investment proportion of the three flower colours of A.obtusiloba all increased in flowers but decreased in leaves.2） Flower numbers of A.obtusiloba in all three colours decreased with an increase of altitude;but single flower area,single flower weight,floral display area and reproductive allocation all increased.3） In the four altitudinal gradients,the individual size of the same colour flowers was significantly positively correlated with flower number,single flower weight,floral display area and reproductive investment.The single flower area was also positively correlated with other aspects,and showed that the altitude directly affected these reproductive traits.There was no significant correlation between reproductive allocation and individual size of the same colour flowers of A.obtusiloba.All these results suggest that there is an important effect of altitude on reproductive traits and reproductive allocation to different colours of A.obtusiloba.These reproductive colour traits and allocation of A.obtusiloba all increased reproductive fitness with an increase of altitude,but the altitude could not fully explain the change of resource allocation strategy of this alpine perennial.