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Comparative pollination biology of Tamarix ramosissima in wild and managed populations.

CHEN Min1,2**, ZHAO Xue-yong1   

  1. (1Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2University of Chinese
    Academy of Sciences, Beijing 100049, China)
  • Online:2014-12-10 Published:2014-12-10

Abstract: Tamarix ramosissima is an ecologically important species of vegetation in the arid regions of Northwest China. In order to understand its pollination biology of different populations, we investigated the following characteristics of the species: flowering dynamics, pollen viability, stigma receptivity, floral visitors, fruit set and breeding systems. We found that the species was characterized by four important reproductive characteristics. Firstly, the flowering peak and flower production period were different between wild and managed populations, being longer in the managed. Secondly, in the wild populations, Apis mellifera was the frequent pollinator, and the P/O rate was 337.2. In the managed populations, Megachile (Amegachile) kagiana was the most effective flower visitor, and the P/O rate was 356.1. Thirdly, fruit set appeared to be higher in the managed populations than in the wild. Finally, outcrossing indexes of both populations were 3, and facultative outcrossing was dominant and selfpollination just played an assistant role in the breeding system of both populations.

Key words: landscape pattern and process, control rate of total runoff, sponge city