野生匍伏型沙打旺低温下正常开花结实原因探讨

Preliminary study on reason of normal ripening of creeping type of Astragalus adsurgens Pall under low temperature

野生匍伏型沙打旺高的叶片率 (LWR)和高的叶面积干重比 (LAR)与其高的生物量相对增速 (RGR)一致 ,才使得野生匍伏型沙打旺能适时合理地利用本地水热资源 ,使其营养生长和生殖生长谐调进行 ,从而能在年均温 4℃～ 6℃的低温条件下以较低积温完成由营养生长向生殖生长的过渡以及生殖期内各发育阶段的转化。而这些又都是以它的外部形态特征 ,即匍伏茎、二级分枝着生部位低。

The high Leaf Weight Rate (LWR) and high Leaf Area Rate (LAR) of creeping type of A. adsurgens Pall. is identical with its high Relative growth Rate (RGR) of totalaerial part biomass; it is the high RGR that make creeping type of A. adsurgens Pall. use water heat resource appropriataly and reasonablely, and make its vegerive growth and reproductive growth carried out hamoniously, and therefore make it carry out the changement from vegetive growth to reproductive growth and each development period changement among reproduction period with low 5℃ accumulated temperature under average year temperature 4℃~6℃. All of this feature is founded on its mophological markings, such as creeping stem, low second branch growth spot, sparse and short surface hair and green and thin leaf.