文献类型：期刊文献

中文题名：民勤绿洲荒漠过渡带梭梭树干液流的时滞特征

英文题名：Time lag characteristics of the stem sap flow of Haloxylon ammodendron in the Minqin oasis-desert ectone,China

作者：姚增旺[1] 褚建民[1] 吴利禄[1] 袁祺[1] 党宏忠[2] 张晓艳[1] 甘红豪[1] 姜生秀[3]

第一作者：姚增旺

机构：[1]中国林业科学研究院林业研究所,国家林业局林木培育重点实验室,北京100091;[2]中国林业科学研究院荒漠化研究所,北京100091;[3]甘肃省治沙研究所民勤荒漠草地生态系统国家野外科学观测研究站,甘肃武威733000

年份：2018

卷号：29

期号：7

起止页码：2339-2346

中文期刊名：应用生态学报

外文期刊名：Chinese Journal of Applied Ecology

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；PubMed;

基金：国家自然科学基金项目(31370707)资助

语种：中文

中文关键词：热扩散探针;时滞特征;液流速率;环境因子

外文关键词：thermal diffusion probe;time lag characteristics;sap flow rate;environmental factor.

分类号：Q948.1

摘要：应用Granier热扩散探针测定民勤绿洲荒漠过渡带梭梭人工林的树干液流,将液流与饱和水汽压差(VPD)和光合有效辐射(PAR)数据分别进行逐行错位分析,探讨树干液流与环境因子之间的时滞效应.结果表明:梭梭日液流速率呈现明显的季节变化,6月平均液流速率最大,8月平均液流速率最小.生长季(5—9月)梭梭树干液流与光合有效辐射、饱和水汽压差存在明显的时滞,树干液流滞后于PAR 80 min,提前于VPD 114 min,且不同月份的时滞长短存在差异.尽管梭梭树干液流在日尺度上更加依赖于PAR的变化,但在白天,树干液流与饱和水汽压差间有更紧密的关系.梭梭生长季树干液流与VPD或PAR之间的时滞与树形因子(株高、地径、50 cm处直径、枝下高、冠幅)及夜间液流量的相关性均不显著.
The stem sap flow rate of Haloxylon ammodendron plantation in the Minqin oasis-desert ectone was measured by the thermal dissipation probe（ TDP）. A cross-correlation analysis was used to estimate the time lag between the stem sap flow and the environmental factors influencing transpiration,including photosynthetically active radiation（ PAR） and water vapor pressure deficit（ VPD）. The results showed that the stem sap flow rate of H. ammodendron had substantial seasonal variation,with the monthly average sap flow being the highest in June and the lowest in August.There was an obvious time lag between the stem sap flow of H. ammodendron and PAR and VPD.The stem sap flow was lagged behind PAR for 80 min but it was ahead of VPD for 114 min. Additionally,the time lag exhibited significant difference among different months during the growth season from May to September. The sap flow of H. ammodendron was more dependent on the variation of PAR on the daily scale than VPD,but it was more closely related to VPD during the day time.The time lag between the stem sap flow and PAR/VPD had no significant correlation with the tree factors（ including plant height,ground diameter,diameter at 50 cm height,under branch height,canopy size） and the nocturnal sap flow.