不同土壤水分条件下叶底珠(Securinega suffruticosa)茎流特征  

Effects of Soil Moisture on Characteristics of Sap Flow of Securinega suffruticosa

作　　者：赵自国[1,2] 夏江宝[2] 王荣荣[3] 李田[2] 赵艳云[2] 刘京涛[2] 

机构地区：[1]滨州学院山东省黄河三角洲野生植物资源开发利用工程技术研究中心,山东滨州256603 [2]滨州学院山东省黄河三角洲生态环境重点实验室,山东滨州256603 [3]山东农业大学林学院,山东泰安271018

出　　处：《中国沙漠》2013年第5期1385-1389,共5页Journal of Desert Research

基　　金：国家自然科学基金项目(31100468);山东省高校科研发展计划项目(J13LC03);滨州学院博士基金项目(2008y10);滨州学院青年科研基金项目(BZXYQNLG200705)资助

摘　　要：为探明叶底珠（Securinega suffruticosa）茎流特征及其对土壤含水量的响应规律,利用Dynamax包裹式茎流计对日光温室内不同土壤水分条件下叶底珠的茎流进行了连续测定。结果表明：（1）叶底珠茎流速率表现出明显日变化节律性。典型晴天里,在土壤相对含水量较高（66.1%）时,茎流速率早晨06：00—06：30开始迅速上升,白天呈现宽的多峰型,最大值出现在11：00,晚上20：00—20：30茎流速率降到一个较低水平,夜间维持一定的茎流速率,日茎流速率最低值出现在凌晨04：00。（2）叶底珠日茎流量、日茎流速率峰值与土壤相对含水量呈对数正相关;昼（06：00—20：00）茎流量与土壤含水量呈极显著线性正相关（r=0.944,p〈0.01）;在土壤含水量较高时（49.5%~85.0%）,夜茎流量与土壤含水量呈极显著负相关（r=-0.961,p〈0.01）,在土壤相对含水量为22.0%~49.5%时,夜茎流量维持在较为稳定的水平（34.1~35.0g）,而在土壤含水量低于22.0%时相关性不显著（r=0.993,p〉0.05）;在土壤相对含水量为22.0%时,夜茎流量达最大值。（3）随土壤含水量的降低,叶底珠白天和夜晚的茎流量差别逐渐减小。To explore characteristics of sap flow of Securinega suffruticosa and its response to soil mois- ture, sap flow velocity of S. suffruticosa was continuously measured under different soil moisture condi- tions in solar greenhouse via Dynamax sap flow measuring system. The results show that sap flow velocity of S. suffruticosa have significant daily rhythm. When soil moisture content is high （66.1% ）, the diurnal variation of sap flow velocity is as a broad multi-peak curve in a typical sunny day. Sap flow velocity begins rising rapidly at 06：00-06：30 in the morning, reaches a daily peak at 11：00, decreases to a lower level at 20：00-20：30, maintained relatively steady at night, and gets the lowest daily value at 04：00 am. Daily sap flow and peak value of sap flow velocity are positively logarithmically correlated with soil moisture, while daytime （06：00-20：00） sap flow is highly significantly positively correlated with soil moisture content （p %0.01）. Night sap flow is significantly negatively correlated with s0il moisture （p%0.01） when soil mois- ture content is between 49.5% -85.0%, and maintaines at a relatively stable level （34.1-35.0 g） when soil moisture content is between 22.0 % -49.5 %, and is not significantly correlated with soil moisture when soil moisture content is below 22.0%. Night sap flow reaches the maximum value when soil water content was 22.0 %. The daytime between daytime and night sap flow decreases with decrease of soil moisture.

关 键 词：叶底珠（Securinega suffruticosa） 茎流 土壤相对含水量 温室 太阳辐射 

分 类 号：Q945.17[生物学—植物学]