风蚀沙埋对疏叶骆驼刺(Alhagi sparsifolia)和花花柴(Karelinia caspica)幼苗的生理影响

Effect of Wind Erosion and Sand Burial on Physiological Characters in Alhagi sparsifolia and Karelinia caspica Seedlings in the Southern Margin of the Taklimakan Desert

风蚀沙埋是风沙活动区植物生长发育面临的重要干扰因子。以塔克拉玛干沙漠南缘策勒绿洲-沙漠过渡带主要建群种疏叶骆驼刺(Alhagi sparsifolia)和花花柴(Karelinia caspica)幼苗为研究对象,通过控制试验设置对照、1/3 H(H为林高)沙埋、2/3 H沙埋、3/3 H沙埋、风蚀2cm、风蚀5cm和风蚀10cm等7个处理,测定处理后2种植物幼苗的丙二醛、可溶性糖、叶绿素含量和光合参数,系统研究这2种植物幼苗对风蚀沙埋的生理响应。结果表明:(1)风蚀沙埋后,花花柴幼苗体内丙二醛累积,造成膜损伤,而疏叶骆驼刺幼苗的丙二醛含量变化不大。(2)沙埋胁迫下疏叶骆驼刺幼苗的叶绿素含量升高,而风蚀胁迫下叶绿素含量降低。3/3 H沙埋下花花柴叶绿素含量显著升高,其他风蚀沙埋处理下叶绿素含量均降低。(3)风蚀沙埋处理下,疏叶骆驼刺幼苗的光合速率升高,而花花柴幼苗的光合速率降低,可见疏叶骆驼刺幼苗耐风蚀沙埋的能力强于花花柴幼苗。

The objective of this study is to investigate the effects of wind erosion and sand burial interference on physiological characters of Alhagi sparsifolia and Karelinia caspicaseedlings.Besides,we also want to find the optimal habitat of desert plant seedlings growth.We set 7 different types of treatments:mild wind erosion,severe wind erosion,moderate wind erosion,control,and mild sand buried,moderate sand burial,severe sand burial to observed the changes of reaction of photosynthetic pigments,chlorophyll,malondialdehyde(MDA)and soluble sugar in A.sparsifolia and K.caspica seedlings under these two interference after 15 days treatments.Important findings,after wind erosion and sand buried treatment,K.caspica seedling accumulation of MDA lead to membrane damage,The MDA content of A.sparsifoliaseedlings changed little.Chlorophyll content under sand buried stress rise with the increase of sand buried depth,but reduced under wind erosion stress.The changes of chlorophyll content are adaption strategy that plant subjected to wind erosion and sand buried stress.Under Wind erosion and sand buried treatments,seedlings can adjusted the increase of A.sparsifolia photosynthetic rate and the decrease of K.caspicaphotosynthetic rate.In addition,K.caspica and A.sparsifolia seedlings have ability for resistance to wind erosion and sand buried,but the ability of tolerance buried stress in A.sparsifolia was stronger than in K.caspica.