摘要
于2008年5—10月利用Dynamax茎流仪观测了沙坡头人工植被区18龄柠条和8龄油蒿的茎干液流速率,并利用涡动相关系统同步监测了环境因子,分析了柠条和油蒿液流动态变化及其与环境因子和作物参考蒸散量(ET0)的关系。结果表明,观测期间柠条和油蒿液流速率均表现为明显的单峰曲线;柠条液流一般在06:00左右启动,12:00左右达到高峰,然后下降,夜间存在液流现象;油蒿液流一般在08:00左右启动,14:00—16:00达到高峰,在夜间没有观测到液流的发生;柠条和油蒿的液流速率和ET0存在显著的线性关系;环境因子对柠条液流量影响的大小顺序为太阳辐射>相对湿度>空气温度>饱和水汽压差>风速;而对油蒿液流量影响的环境因子大小顺序为太阳辐射>饱和水汽压差>相对湿度>空气温度>风速。
Stem sap flows of 18-year-old Caragana korshinskii and 8-year-old Artemisia ordosica plants were monitored continuously with Dynamax stem flow recorder for a growing season in 2008 under nature conditions in a revegetated desert area. Environmental factors such as solar radiation, air temperature, relative humidity, wind speed, and precipitation were measured meanwhile with eddy correlation system. Diurnal and seasonal variations of sap flow rates and their correlation with meteorological factors and reference evapotraanspiration were analyzed. Results show that the curves of stem sap flow rates in the whole growing season are obviously single-peak. Stem sap flow of Caragana korshinskii usually starts at 06：00 and increases gradually, reaches peak point at about 12：00, then gradually decreases, and sap flow exists at night. Stem sap flow of Artemisia ordosica usually starts at 08：00 and increases gradually, reaches peak point at about 14：00-16：00, then gradually decreases, but there is no sap flow at night. There is a significantly linear relationship between sap flow rate and reference evapotranspiration. Sap flow rate is also significantly correlated with environmental factors, and the order of the main meteorological factors affecting the sap flow rate of Caragana korshinskii is solar radiation〉relative humidity〉air temperature〉vapour pressure deficit〉wind speed, the order of the main meteorological factors affecting the sap flow rate of Artemisia ordosica is solar radiation〉vapour pressure deficit〉relative humidity〉air temperature〉wind speed.
出处
《中国沙漠》
CSCD
北大核心
2011年第3期683-688,共6页
Journal of Desert Research
基金
中国科学院知识创新工程重要方向项目(KZCX2-EW-301-3)
国家自然科学基金项目(40971033
30870425)资助
关键词
茎干液流
柠条
油蒿
荒漠人工植被区
stem sap flow
Caragana korshinskii
Artemisia ordosica
revegetated desert area
