杭州石荠苧和小鱼仙草在不同土壤水分下的光合可塑性

【作者】 葛滢； 卢毅军； 常杰； 关保华；

【机构】 浙江大学生命科学学院；

【摘要】 <正> The phenotypic plasticity for photosynthetic characteristics response to soil water availability of M.hangchowensis, which is an endangered species and M.hangchowensis, which is a weed, was compared. Withthe increase of soil water stress, the photosynthetic rate （P_N） and stomatal conductance（g_s） of M.hangchowensisshowed a trend of rising at first, then descending, the largest and the smallest of P_N and gs occurred at W₆₀（medium to slightly wet） and W₂₀（drought）respectively; the largest and smallest gs of M. dianthera alsooccurred at W₆₀and W₂₀respectively, while the P_N always increased with soil water content decreasing. BothM.hangchowensis and M.dianthera had the largest water use effciency（WUE）at W₂₀,they enhanced WUEby smaller transpiration rate（Tr） and greater P_N respectively. The experiment of re-watering showed that there更多还原