| 沙木蓼蒸腾耗水规律研究 |
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| 引用本文： | 樊文会,丁国栋,吴斌,张宇清,乌日娜.沙木蓼蒸腾耗水规律研究[J].干旱区资源与环境,2012(11):188-193. |
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| 作者姓名： | 樊文会 丁国栋 吴斌 张宇清 乌日娜 |
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| 作者单位： | 北京林业大学水土保持学院,宁夏盐池荒漠化防治定位观测研究站 |
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| 基金项目： | 教育部博士点基金项目(20090014110003);“十一五”国家科技支撑计划课题(2006BAD26B0301)资助 |
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| 摘 要： | 采用热平衡包裹式树干茎流测量系统(Stem Heat Balance,SHB)和自动气象站观测沙木蓼生长季茎干液流以及环境因子,以揭示毛乌素沙地沙木蓼(Atraphaxis bracteata A.Los)蒸腾耗水规律。结果表明:1)沙木蓼液流具有明显的昼夜节律,启动、停止与日出、日落同步,夜间仍保持一定液流,以补充植物体水分亏缺。2)沙木蓼液流规律受天气影响显著:降雨时白天的液流速率大幅下降,夜间液流却大幅提升,日液流总量降至晴天的一半;阴天液流速率平缓,昼夜差距减小,液流总量较晴天小幅下降;多云天液流速率波动剧烈,但总液流量变化不大。3)沙木蓼生长季的液流量与土壤水分状况和植物体的生长阶段密切相关,6、7月份沙木蓼植株处在旺盛的营养生长阶段,新叶生长迅速,加上土壤含水充足,液流量总体是增长趋势,从7月末到8月份沙木蓼植株从营养生长期过渡到生殖生长以开花结果为主的阶段,蒸腾减小,同时天气干旱土壤水分逐渐亏缺,液流量呈下降趋势。4)从6月到8月基茎9mm,16mm,25mm的沙木蓼总耗水分别为100.8kg,170.5kg,301.3kg。沙木蓼植株生长季茎干液流总量基本与基茎成正比,平均为11.5kg/mm/a,可以用来作各个茎级沙木蓼植株的茎干液流推算,进而推算已知林分的总蒸腾耗水量。
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| 关 键 词： | 毛乌素沙地 沙木蓼 茎流 耗水 天气 土壤水分 |
Study on the sap flow of Atraphaxis bracteata growing in Mu us Sand |
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| FAN Wenhui,DING Guodong,WU Bin,ZHANG Yuqing,WU Rina.Study on the sap flow of Atraphaxis bracteata growing in Mu us Sand[J].Journal of Arid Land Resources and Environment,2012(11):188-193. |
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| Authors: | FAN Wenhui DING Guodong WU Bin ZHANG Yuqing WU Rina |
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| Institution: | (Key Laboratory of Soil and Water Conservation and Combating Desertification,Ministry of Education,College of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,P.R.China) |
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| Abstract: | To reveal the evapotransporation of Atraphaxis bracteata in Mu us Sandy land,Heat-balance Packaged Stem Sap Flow Measuring System and Automatic Weather Station System were used to simultaneously measure and monitor the sap flow velocity and related environmental factors.The results showed that:(1) Sap flow rate of Atraphaxis bracteata ascend and descend with the sunrise and sunset,it keep at peak for 8 hours in day.There is still sap flow in night for water storage in plants.(2) The process of sap flow rate is obviously affected by weather.In rainy days the flow drop to a rather low rate,but in night it rise greatly,the total flow is half of that on sunny days.There is a relatively small difference in flow rate of day and night in cloudy wheather,and the total flow reduces.In cloudy days,with the cloud moving,sap flow fluctuates,but total flow isn't affected so much.(3) Sap flow of A.bracteata in the growing season is related with the soil water and vegetation storage.From the vigorous vegetative growth in June and July to the reproductive stage in August,the soil water exhausts,generally the sap flow is gradually decrease.(4) Sap flow of A.bracteata with different sizes of stem and crown drift simultaneously and in proportion to stem diameter.From May to July,total sap flow of A.bracteata with the stem diameters of 9mm,16mm and 25mm,are 100.8kg,170.5kg,301.3kg,respectively,average as 11.5kg/mm/a.It can be used to calculate the total evaporation of a known forest of A.bracteata. |
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| Keywords: | Mu us sand Atraphaxis bracteata sap flow weather soil water |
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