Effect of soil drought on growth and water use efficiency characteristics of four native gramineous grasses in Loess Plateau
GUO Ying1,HAN Rui-lian2,LIANG Zong-suo1,2(1.College of Life Science,Northwest Sci-Tech University of Agriculture and Forestry,Yangling 712100,China;2.Institute of Soil and Water Conservation,Northwest Sci-Tech University of Agriculture and Forestry,Yangling 712100,China)
The growth and water use efficiency characteristics of four native grasses in Loess Plateau were studied under different soil water contents.The results showed that water consumption of those species decreased with the increase of soil drought stress,and water consumption of those grasses was different: Bothriochloa ischaemumAgropyron cristatumCleistogenes songoricaStipa bungeana.The highest water consumption in one day,ten-day and one month were different.The highest water consumption day of medium and severe drought stress occurred about 10 days earlier than the adequate soil water content.The time of day when the greatest water consumption occurred arrived early with the decrease of soil water contents.The growth of plant height and single leaf area of the four native grasses were the fastest under adequate soil water contents,and were the lowest under severe drought.Under drought condition,the growth of four grasses was all inhibited,especially for S.bungeana and C.songorica.The leaf water content of different species decreased with the increase of soil water stress.The leaf water content of A.cristatum and B.ischaemum were higher than that of S.bungeana and C.songorica obviously.Water use efficiency of S.bungeana and C.songorica decreased with the decrease of soil water content,they had lower water consumption and low WUE characteristics.A.cristatum and B.ischaemum had the highest WUE under medium drought treatments,respectively.A.cristatum had low water consumption and high WUE characteristic,B.ischaemum had high water consumption and high WUE characteristic.
【Fund】： 中国科学院知识创新工程重要方向项目(KZCX2-YW-443);; 中国科学院西部行动计划项目(KZCX2-XB2-05-01)资助
【CateGory Index】： S54
【CateGory Index】： S54