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The response of Caragana microphylla seedlings to water table changes in Horqin Sandy Land,China

查看全文 作　　者：YunHua [1,2]Ma;TongHui [1]Zhang;XinPing [1]Liu;Wei [1]Mao;XiangFei [1,2]Yue 高影响力作者 机构地区：[1]Naiman Desertification Research Station,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences;[2]University of Chinese Academy of Sciences高影响力机构 出　　处：《Research in Cold and Arid Regions》索引2015年第7卷第1期,共6页高影响力期刊 基　　金：funded by the Chinese National Key Projects for Basic Scientific Research (No.2009CB421303);the Chinese National Support Projects of Science and Technology (No.2011BAC07B02);the Strategic Leading Science and Technology Project of Chinese Academy of Sciences (No.XDA05050201-04-01);the Chinese National Science Foundation (No.41371053) 摘　　要：This paper focuses on the growth response of Caragana microphylla seedlings to changes of artificially controlled water table in Horqin Sandy Land, China. Monitoring results of soil water content shows that soil moisture is closely correlated to groundwater depths. Soil volumetric water increased rapidly when close to water sources and finally stabilized in a saturated state. The soil moisture trend of CK(control) increased gradually at 0–50 cm of soil depth then decreased to 4% below 50 cm soil depth. C. microphylla can adapt to different soil environments by changes in ecological and physiological characteristics. By comparing the ecological characteristics of C. microphylla seedlings at various water tables, we found that a shallow water table of 40 cm depth inhibited seedling growth because of weak ecological characteristics. A groundwater depth of 120 cm was more advantageous for plant height and canopy growth of C. microphylla seedlings. During the first two years, the most suitable water depth for root biomass was 120 cm, and 180 cm for root length. The growth of vertical roots is positively correlated with groundwater depth, and root thickness is the determinate factor for root biomass while the fine root is the determinate factor for root length. A thick root would grow much more in a natural drought environment while access to ground water promotes the growth of fine roots. 关 键 词：地下水位 科尔沁沙地 中国 小叶锦鸡儿 柠条 生长反应 土壤水分 生态特征
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