摘要:
该文测定并研究了不同水分处理下,不同黑杨无性系的长期水分利用效率(WUEL)、叶片δ13C、光合作用、气孔及其相互关系.结果显示无性系间WUEL、δ13C、光合作用、气孔都存在差异.4个水分处理下J2、J6、J7、J8、J9都是WUEL较优的无性系,同时它们的δ13C高、净光合速率Pn和瞬时水分利用效率WUEi较高、气孔频度和气孔大小适中、上/下表皮气孔数目比大.气孔的差异是导致无性系间PnWUEi差异,并最终导致WUEL、δ13C差异的关键因子.δ13C和WUEL呈正相关,充分供水条件下相关性最好.
Abstract:
Foliar carbon isotope composition (δ13C), long-term water use efficiency (WUEL), photosynthesis, and stomata of different <Populus deltoids clones were studied under different water treatments. The results showed that the differences in WUEL, δ13C, photosynthesis and stomata among the tested clones were obvious. Under four water treatments, J2, J6, J7, J8, J9 were good clones in WUEL, with higher δ13C, relative higher net photosynthetic rate (Pn), instantaneous water use efficiency (WUEi),optimal stomatal frequency and stomatal size, higher superior/inferior ratio. The stomatal differences might be a key factor, which leading to Pn and WUEi differences, and ultimately inducing WUEEL and δ13C differences. WUEL was positively related to δ13C, and the best performance occurred under well watered treatment.
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