摘要
采用水分供应分层模拟柱(土壤层-岩石层-岩溶水层),进行水分梯度处理(田间持水量分别为30%~40%、50%~60%和70%~80%),模拟喀斯特"双层"地质特点,研究了喀斯特生境模拟对一年生茶条木植株生长、生理的影响。结果表明:随着土壤水分胁迫程度的加强,茶条木的株高和地上基径增量减少,叶片相对含水量和叶片叶绿素含量都显著下降,这说明植株生长受到明显抑制;随胁迫程度加强和胁迫时间延长,叶片可溶性蛋白质和可溶性糖含量均呈增加趋势,而叶片丙二醛含量呈现先下降后增加趋势,这说明植株通过增加渗透调节物质的积累来适应环境变化,从而提高植株的耐旱性。
In order to explore the influences of Karst geological structure on growth and physiology of one-year-old Delavaya toxocarpa Franch,the double layer geological characteristics of Karst was simulated using the water supply layered simulation column(soil layer-rock layer-karst water layer),and water gradient(field capacity was 30%-40%,50%-60% and 70%-80%,respectively) treatment was conducted.The results showed that along with the strengthening soil water stress,increment of plant height and ground diameter of Delavaya toxocarpa Franch decreased,relative water content and chlorophyll content in leaf all decreased significantly,namely the plant growth was obviously inhibited.With the stress strengthening and the time extending,the contents of soluble protein and soluble sugar in leaf all showed an increasing trend,but the MDA content showed a trend of firstly decreased and then increased.Therefore,plant adapt to environmental changes by increasing osmolytes accumulation,thereby improving the drought resistance.
出处
《湖南农业科学》
2013年第5期24-27,30,共5页
Hunan Agricultural Sciences
基金
中国科学院知识创新工程重大项目(KZCX2-XB3-10)
国家科技支撑计划项目课题(2012BAD05B03-6)
国家自然科学基金(30970538
31270551
41171246)
关键词
喀斯特生境
模拟
茶条木
生理
Karst habitat
simulation
Delavaya toxocarpa Franch
physiology