以大气CO_(2)浓度上升和温度增加为主要特征的全球气候变化是影响全人类可持续发展的热点问题。本研究采用开顶式气室(open top chamber,OTC)系统模拟大气CO_(2)浓度上升(EC处理,+100 ppm)和增温(ET处理,+1.5℃)的气候变化情景,对江汉平原双季稻主要生长期地表水和土壤孔隙水溶解性有机碳(DOC)浓度、芳香性指数、生物量和产量及相关因素进行观测。结果表明:与CK相比,EC处理显著增加早稻灌浆期土壤20 cm孔隙水DOC浓度,增幅为284.2%(P<0.05);EC处理显著降低早稻孕穗期和抽穗期的DOC芳香性指数,降幅分别为36.9%和31.6%(P<0.05)。EC处理显著降低早稻拔节期土壤20 cm DOC芳香性指数(-35.5%)(P<0.05)。与EC和ET处理相比,大气CO_(2)浓度上升与增温的叠加处理(ETEC)显著增加稻田整个生长期土壤20 cm孔隙水DOC芳香性指数,增幅为23.6%~51.4%(P<0.05)。EC和ET处理均显著增加了双季稻的地上生物量和籽粒产量(P<0.05)。本研究为探索江汉平原双季稻对未来气候变化的响应以及稻田生态系统的碳循环关键过程提供科学参考依据。
Twenty-third collections of Salvia spp.in Beijing were analyzed phylogenetically by AFLP technique.6 primer pairs with good repetition and highly polymorphic bands from 21 pairs were selected to amplify the genomic DNA.All of 367 AFLP bands were obtained,in which 359(97.82%)were polymorphic markers.At a genetic distance of 0.32,the collections could be clustered into 7 species i.e.S.splendens,S.farinacea,S.coccinea,S.plebeia,S.miltiorrhiza,S.umbratica and S.officinalis.The respective genetic relationship be...
