Study on the Photosynthetic Characteristics of Bothriochloa ischaemum under Different Water and Nutrient Conditions Ⅰ.Diurnal Variation of Photosynthesis
为揭示黄土丘陵区乡土种白羊草(Bothriochloa ischaemum L. Keng.)在不同水肥供应条件下的光合生理特征,本研究采用盆栽控制实验,比较研究了白羊草在2个水分水平(HW-80%FC和LW-40FC%)和3个养分(CK、P和NP)处理下的光合生理日变化特征。结果表明:HW下白羊草光合速率日变化均呈"三峰"型曲线。LW下,P和NP处理呈"双峰"型曲线,CK处理呈"三峰"型曲线,均具有明显的光合"午休"现象。不同水肥条件下白羊草叶片水分利用效率日变化均呈"L"型。HW下,白羊草光合速率日均值无肥处理显著高于其他处理(P<0.05),LW下,3养分处理间白羊草光合速率日均值无显著差异,而不同养分处理下,土壤水分胁迫均显著降低了白羊草光合速率日均值,并使光合"午休"程度加剧,水分是限制白羊草光合生理过程的首要因素。
其他摘要
In order to study the photo-physiological characteristics of old world bluestem(Bothriochloa ischaemum L.Keng.) from loess hilly-gully region under different water and nutrient supplies,the diurnal dynamics of photosynthetic characteristics were determined under potted condition with two water treatments(HW-80% FC,LW-40% FC) and three nutrient treatments(CK,P and NP).Results indicted that the diurnal changes of net photosynthetic rate in old world bluestem presented a three-peak pattern cure under adequate ...
修改评论