| 库姆塔格沙漠东南部胡杨液流变化及其对环境因子的响应 |
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| 引用本文： | 黄雅茹,马迎宾,李永华,辛智鸣,赵纳祺,杨战,马媛,吴静,董雪,李帅.库姆塔格沙漠东南部胡杨液流变化及其对环境因子的响应[J].草业科学,2021(2):335-347. |
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| 作者姓名： | 黄雅茹 马迎宾 李永华 辛智鸣 赵纳祺 杨战 马媛 吴静 董雪 李帅 |
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| 作者单位： | 中国林业科学研究院沙漠林业实验中心/内蒙古磴口荒漠生态系统国家定位观测研究站;乌兰布和沙漠综合治理国家长期科研基地;中国林业科学研究院荒漠化研究所;库姆塔格荒漠生态系统国家定位观测研究站;甘肃敦煌荒漠生态系统国家定位观测研究站 |
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| 基金项目： | 中央级公益性科研院所基本科研业务费专项(CAFYBB2019MA004、CAFYBB2020ZE005);国家自然科学基金(41671049);科技基础资源调查专项(2017FY100203-1)。 |
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| 摘 要： | 于2018年4月?10月(春季4月、夏季7月、秋季9月)利用PS-TDP8树木茎流监测系统对库姆塔格沙漠东南部胡杨(Populus euphratica)的液流速率变化进行监测,采用相关分析及逐步回归法分析气象因子(太阳总辐射、空气温度、风速、空气相对湿度)对胡杨液流的影响。结果表明:胡杨茎干液流日变化趋势呈几字“宽峰型”;夏季液流的启动时间最早,液流启动在06:00,秋季液流启动时间最晚,不同季节夜间存在较高液流(10.994~26.035 cm·h?1);树干液流速率与太阳总辐射、空气温度、风速、饱和水气压差呈正相关关系,与空气湿度呈负相关关系;影响春季、秋季胡杨液流速率的主要气象因子是太阳总辐射和空气温度,夏季为太阳总辐射和空气相对湿度;不同季节胡杨液流速率与空气温度、空气相对湿度、风速、饱和水气压差的日变化响应呈顺时针环状,与太阳辐射响应呈逆时针环状;不同季节胡杨液流速率对气象因子的响应规律存在差异。这表明胡杨为了保持水分平衡应对水分亏缺的策略不同,在一定条件下(极端干旱)通过气孔调节降低水分损失。研究结果对于明确干旱沙漠环境中胡杨水分传输对环境因子的响应规律及更深入地认识胡杨适应干旱环境的水分利用策略具有重要意义。
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| 关 键 词： | 胡杨 液流 气象因子 库姆塔格沙漠 |
Dynamics of sap flow of Populus euphratica and responses to environment variables in the southeast of the Kumtag Desert |
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| HUANG Yaru,MA Yingbin,LI Yonghua,XIN Zhiming,ZHAO Naqi,YANG Zhan,MA Yuan,WU Jing,DONG Xue,LI Shuai.Dynamics of sap flow of Populus euphratica and responses to environment variables in the southeast of the Kumtag Desert[J].Pratacultural Science,2021(2):335-347. |
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| Authors: | HUANG Yaru MA Yingbin LI Yonghua XIN Zhiming ZHAO Naqi YANG Zhan MA Yuan WU Jing DONG Xue LI Shuai |
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| Institution: | (Experimental Center of Desert Forestry,Chinese Academy of Forestry/Inner Mongolia Dengkou Desert Ecosystem National Observation Research Station,Dengkou 015200,Inner Mongolia,China;National Long-Term Scientific Research Base of comprehensive control in Ulan Buh Desert,National Forestry and Grassland Administration,Dengkou 015200,Inner Mongolia,China;Institute of Destertification Studies,Chinese Academy of Forestry,Beijing 100091,China;National Forestry Bureau's Kumtage Desert Ecosystem Location Research Station,Dunhuang 736200,Gansu,China;State Forestry Administration Dunhuang Desert Ecosystem Location Research Station,Dunhuang 736200,Gansu,China) |
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| Abstract: | In this study,the PS-TDP8 tree stem sap flow monitoring system was used to study the sap flow of Populus euphratica(the Euphrates or desert poplar)in the southeast of the Kumtag Desert from April to October in 2018(spring April,summer July,autumn September).Correlation analysis and stepwise regression method were used to analyze the influence of meteorological factors(total solar radiation,air temperature,wind speed,relative air humidity)on the sap flow of P.euphratica.The results showed that the diurnal sap flow variation trend of P.euphratica displayed a"broad peak type".Sap flow in summer had the earliest start time,and the sap flow started at 06:00 in the morning,while the sap flow started at the latest in autumn.There was high sap flow velocity in all seasons at night.The trunk sap flow velocity was positively correlated with solar radiation,air temperature,wind speed,and saturated water pressure difference,while negatively correlated with air humidity.The main meteorological factors that affected the flow velocity of P.euphratica in spring and autumn were total solar radiation and air temperature,while those in summer were total solar radiation and relative air humidity.The response of P.euphratica sap flow velocity to air temperature,air relative humidity,wind speed,and saturated water pressure difference was clockwise in different seasons,and the asymmetry of the response to solar radiation was counterclockwise.The response of P.euphratica sap flow velocity to meteorological factors difference is different in different seasons,indicating that P.euphratica has different strategies to cope with water deficit to maintain water balance,and reduce water loss through stoma regulation under certain conditions(e.g.,extreme drought in summer).The current results are of great significance for clarifying the water transpiration response of P.euphratica to environmental factors in arid desert environments and for a deeper understanding of the water use strategy of P.euphratica to adapt to arid environments. |
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| Keywords: | Populus euphratica sap flow meteorological factors Kumtag Desert |
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