金沙江干热河谷4种优势草本植物苗期抗旱生理特性  

Drought-resistant physiological characteristic of four dominated grass vegetation species during the seedling stage in dry-hot valley of the Jinsha River

作　　者：李建查 熊东红[2,3] 奎建蕊[1] 王春雪[1] 樊博[1] 张宝军[2,3] 张明忠[1] 郭敏[2,3] 史亮涛[1] 

机构地区：[1]云南省农业科学院热区生态农业研究所,云南元谋651300 [2]中国科学院山地灾害与地表过程重点实验室,四川成都610041 [3]中国科学院水利部成都山地灾害与环境研究所,四川成都610041

出　　处：《草业科学》2016年第8期1598-1603,共6页Pratacultural Science

基　　金：中国科学院"西部之光"重点项目(Y4R2060060);中国科学院水利部成都山地灾害与环境研究所"青年百人团队"项目(SDSQB-2011-01);国家重点基金研究发展项目(2015CB452704);四川省应用基础研究计划项目(2014JY0067)

摘　　要：为了明晰干热河谷优势草本植物的抗旱生理特性,通过盆栽模拟自然干旱,对扭黄茅(Heteropogon contortus)、孔颖草(Bothriochloa pertusa)、拟金茅(Eulaliopsis binata)和百喜草(Paspalum natatu)土壤水分变化和植株苗期抗旱生理性状进行分析。结果表明,灌水结束后,土壤水分均随干旱时间的增加明显减少,孔颖草土壤含水量明显比其它3种植株的高。随着土壤水分减少,扭黄茅和孔颖草叶片含水量变化不明显,灌水停止30d时拟金茅和百喜草叶片含水量明显降低(P<0.05);灌水停止15d时扭黄茅和孔颖草叶片脯氨酸含量显著增加(P<0.05),拟金茅和百喜草叶片脯氨酸含量变化不显著(P>0.05);扭黄茅和百喜草叶绿素含量变化不显著(P>0.05),灌水停止15d时孔颖草和拟金茅的叶片叶绿素含量均显著降低(P<0.05);孔颖草和百喜草叶片丙二醛含量变化不显著(P>0.05),拟金茅叶片丙二醛含量显著增加(P<0.05)。In order to clarify drought-resistant physiological characteristic of dominated grass vegetation in Jinsha River dry-hot valley. Soil water and drought-resistant physiological characteristic of Heteropogon contortus, Bothriochloa pertusa, Eulaliopsis binata, Paspalurn natatu during seedling stage were studied in a potted experiment simulated natural drought condition. The results indicated that soil water content decreased significantly with the passing of time after irrigation. The soil water content was higher in potted B. pertusa than in others. Leaf water content of H. contortus and B. pertusa didn＇t reduce significantly with reduction of soil moisture（P〉0.05）. Leaf water content of E. binata and P. natatu reduced obviously at 30 d after irrigation （P〈0.05）. Proline accumulation of H. contortus, B. pertusa and P. natatu increased significantly at 15 d after irrigation（P〈0.05）. Proline accumulation of E. binata didn＇t increase significantly with reduction of soil moisture. Chlorophyll content of H. contortus and P. natatu didn＇t reduce significantly, Chlorophyll content of B. pertusa and E. binata reduced significantly with reduction of soil moisture. MDA content of B. pertusa and P. natatu didn＇t increase significantly, MDA content of H. contortus and E. binata increased significantly with reduction of soil moisture.

关 键 词：优势草本植物 土壤水分变化 生理特性 干热河谷 

分 类 号：Q945[生物学—植物学]