骆驼刺在不同遮阴下的水分状况变化及其生理响应  

Change of different shading on moisture conditions and the physiological response in Alhagi sparsifolia

作　　者：唐钢梁[1,2,3] 李向义[1,3] 林丽莎[1,3] 李磊[1,2,3] 鲁建荣[1,2,3] 

机构地区：[1]中国科学院新疆生态与地理研究所,乌鲁木齐830011 [2]中国科学院大学,北京100049 [3]新疆策勒荒漠草地生态系统国家野外科学观测研究站,新疆策勒848300

出　　处：《植物生态学报》2013年第4期354-364,共11页Chinese Journal of Plant Ecology

基　　金：国家重点基础研究发展计划(2009CB-421303);国家科技支撑项目(2009BAC54B03);新疆维吾尔自治区科技支撑计划项目(2009-33125)

摘　　要：为了研究骆驼刺(Alhagi sparsifolia)在不同遮阴环境下的生理适应性,以塔克拉玛干沙漠南缘策勒绿洲外围骆驼刺为试验材料,设置正常光照、中度遮阴(70%自然光)、重度遮阴(30%自然光)3种光照环境,观测了遮阴90天后土壤含水率,骆驼刺水势、气孔导度(Gs)、叶形态、叶绿素(Chl)含量、脯氨酸(Pro)含量、丙二醛(MDA)含量、可溶性糖含量等在不同遮阴条件下的变化特征。结果显示:随着遮阴强度的增大,土壤含水率,骆驼刺水势、Gs、比叶面积、Chl含量、类胡萝卜素含量有一定程度的增加;骆驼刺叶片厚度、Pro含量、MDA含量、可溶性糖含量以及Chla/Chlb有不同幅度的减少。结果表明:一段时间内适度的遮阴在一定程度上降温增湿,能够改善骆驼刺的生境,从而避免高温强光和低水势对植物造成的伤害,促进植物的生长,但长期遮阴对植物的生长不利。因此建议通过短期的遮阴,特别是在温度较高、光照较强的夏季正午前后对骆驼刺进行遮阴处理,以达到对骆驼刺的逆境防护,促进骆驼刺的生长。Aims Alhagi sparsifolia, which occurs in arid regions, effects of shade on A. sparsifolia are complex, because other environmental factors. Our goal is to study form-especially in terms of water-ofA, sparsifolia. is commonly considered a type of sun plant. However, the in addition to reduced light intensity, shade often changes the impact of different shading on the physiological Methods We used natural light, moderate shade （70% natural light） and severe shade （30% natural light） and after 90 days observed reactions of water status, leaf morphology and stress resistance indicators in A. sparsifolia. Important findings With the increase in shading, there are rises in soil moisture content, water potential, stomatal conductance, specific leaf area, chlorophyll （Chl） and carotenoid content in A. sparsifolia, as well as declines in leaf thickness, proline, malondialdehyde, soluble sugar content and Chl a/Chl b. Moderate shade for A. sparsifolia can reduce the temperature and increase the humidity. This can improve the habitats of A. sparsifolia by avoiding dam- age caused by high temperature, high light and low water potential and then promoting the growth of plants, although long-term shade is detrimental. Therefore, we recommend protecting A. sparsifolia and promoting its growth with short-term shade, especially during the high temperatures and strong light at noon in the summer.

关 键 词：骆驼刺 光照 水分 遮阴 

分 类 号：Q945[生物学—植物学]