| 祁连山青海云杉(Picea crassifolia)夜间树干液流特征及影响因素 |
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| 引用本文： | 魏潇,常学向,杨淇越,刘冰,王国华.祁连山青海云杉(Picea crassifolia)夜间树干液流特征及影响因素[J].冰川冻土,2015,37(1):87-94. |
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| 作者姓名： | 魏潇 常学向 杨淇越 刘冰 王国华 |
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| 作者单位： | 1. 中国科学院 寒区旱区环境与工程研究所 临泽内陆河流域研究站/内陆河流域生态水文重点实验室, 甘肃 兰州 730000;
2. 中国科学院大学, 北京 100049 |
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| 基金项目： | 国家自然科学基金项目(91025017; 41271524); 中国科学院"百人计划"项目(29Y127D11)资助 |
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| 摘 要： | 利用SF-300树干液流仪对祁连山中段青海云杉(Picea crassifolia)2011年生长季树干液流进行监测, 研究了在典型天气条件下青海云杉的夜间树干液流特征, 以及气象因子和树形特征对其夜间液流变化的影响. 结果表明:典型晴天、阴天, 夜间树干液流速率分别在(2.78±0.64)~(5.02±1.06) g·cm-2·h-1、(2.31±0.62)~(3.94±1.22) g·cm-2·h-1之间波动, 其平均值分别为(3.55±0.28) g·cm-2·h-1、(3.06±0.24) g·cm-2·h-1; 夜间树干液流量分别占当日总液流量的(34.51±6.20)%、(46.06±11.20)%. 夜间树干液流速率与饱和水汽压差、气温呈显著相关关系, 与风速相关性不显著; 夜间树干液流与胸径、树高、边材面积、胸径平方与树高之积呈显著线性相关, 与冠幅相关性不显著. 青海云杉夜间树干液流的变化是其生理特征与环境因素综合作用的结果, 夜间树干液流可能用于夜间蒸腾和植物体内部的水分补充.
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| 关 键 词： | 树干液流 气象因子 树形特征 青海云杉 祁连山 |
| 收稿时间： | 2014-07-06 |
| 修稿时间： | 2014-11-09 |
Characteristics of nocturnal sap flow of Picea crassifolia in the Qilian Mountains and its influence factors |
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| WEI Xiao,CHANG Xuexiang,YANG Qiyue,LIU Bing,WANG Guohua.Characteristics of nocturnal sap flow of Picea crassifolia in the Qilian Mountains and its influence factors[J].Journal of Glaciology and Geocryology,2015,37(1):87-94. |
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| Authors: | WEI Xiao CHANG Xuexiang YANG Qiyue LIU Bing WANG Guohua |
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| Institution: | 1. Linze Inland River Basin Research Station/Key Laboratory of Ecohydrology of Inland River Basin, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Nocturnal sap flow has ecological and physiological significant for plants, and it is part of plant water that cannot be ignored. The variations of Picea crassifolia nocturnal sap flows in different weather conditions and their responses to meteorological factors and tree size in the Qilian Mountains are analyzed, in order to have a better understanding of the transpiration of Picea crassifolia. During June 12 to October 16, 2011, sap flow velocities of seven Picea crassifolia trees were measured continuously by SF-300 heat pulse meters. Microclimate data were collected synchronously by two automatic weather stations in Pailugou watershed. The nocturnal sap flow velocity was measured from (2.78±0.64) g·cm-2·h-1 to (5.02±1.06) g·cm-2·h-1 in typical sunny days and from (2.31±0.62) to (3.94±1.22) g·cm-2·h-1 in typical cloudy days, with the average values of (3.55±0.28) g·cm-2·h-1 and (3.06±0.24) g·cm-2·h-1, respectively. Nocturnal sap flow is (34.51±6.20) % of the total daily flow in typical sunny days and (46.06±11.20) % of that in typical cloudy days. Nocturnal sap velocity is significantly correlated with vapor pressure deficit and temperature, and insignificantly correlated with wind speed. Nocturnal sap flow has linear relationships with diameter at the breast height, tree height, sapwood area, product of tree height and the square of diameter at the breast height, respectively. But nocturnal sap flow is insignificantly related with crown size. In conclusion, the variation of nocturnal sap flow of Picea crassifolia is controlled by its physiological characteristics and the environmental factors. Nocturnal sap flow of Picea crassifolia is used for transpiration and water recharge. |
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| Keywords: | sap flow meteorological factors tree size Picea crassifolia Qilian Mountains |
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