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Characteristics of plant calcium fractions for 25 species in Tengger Desert

查看全文 作　　者：HuaCong [1]Ci;XingDong [1]lie;Rong [1]Li;Wei [1]Wu;PingPing [1]Xue;YuBao [1]Gao;HaLin [2]Zhao 高影响力作者 机构地区：[1]College of Life Sciences,Nankai University,Tianjin 300071,China;[2]Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou,Gansu 730000,China高影响力机构 出　　处：《Research in Cold and Arid Regions》索引2010年第2卷第2期,共7页高影响力期刊 基　　金：funded by the National Natural Science Foundation of China (Grant No. 30970546);by the National Basic Research Program of China (Grant No. 2009CB421303) 摘　　要：Little attention has been paid to plant calcium fractions in the desert.To address the characteristic of the calcium fractions of desert plants,we collected 25 plant species in Tengger Desert,observed the calcium crystals using an optical microscope and determined water soluble calcium,acetic acid soluble calcium,and hydrochloric acid soluble calcium.To do so,we used sequential fractionation procedures to probe the relationships among different functional groups,different growth forms,or different successional stages.The results showed that the psammophyte,the late successional plants,and the drought-resistant shrub and semi-shrub all held considerable calcium oxalate crystal compared to the grassland plants,the early successional plants,and the perennial herb.With the proceeding succession,the acetic acid soluble calcium decreased gradually,and the hydrochloric acid soluble calcium increased gradually.The perennial herb had more water soluble calcium,while shrub held greater hydrochloric acid soluble calcium.The grassland plants held more water soluble calcium,while psammophyte had greater hydrochloric acid soluble calcium.This implies that the plants that are relatively sensitive to drought hold more calcium ion,while the drought-resistance plants hold more calcium oxalate.Thus,the plant calcium components are in close relation to plant drought-resistance,and of important significance in plant physiology of the desert. 关 键 词：CALCIUM crystal PLANT CALCIUM components PLANT PHYSIOLOGY Tengger DESERT
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