干旱荒漠区银白杨树干液流动态  

Sap flow dynamics of Populus alba L. ×P. talassica plantation in arid desert area

作　　者：张俊[1] 李晓飞 李建贵[1] 王华 黄春堂 闵首军 李刚 张福海 田旭 孔军 

机构地区：[1]新疆农业大学林业研究所,乌鲁木齐830052 [2]新疆油田公司白碱滩物业管理公司,克拉玛依834008 [3]新疆油田公司造林减排作业区,克拉玛依834000

出　　处：《生态学报》2013年第18期5655-5660,共6页Acta Ecologica Sinica

基　　金：国家"十一五"科技支撑计划项目(2008BAD95B07);国家林业公益性行业科研专项项目(201004004)

摘　　要：应用热扩散式树干茎流计(TDP)于2012年7月1日至7月25日,在克拉玛依地区农业开发区对银白杨(Populus alba L.×P.talassica)人工林树干液流速率进行了连续测定,并对气象、土壤水分等指标进行了同步测定。结果表明:7月份的晴天银白杨树干液流速率日变化呈单峰型,阴天呈多峰型,在测量时期液流速率日平均值为0.6059 L/h;银白杨树干单位边材面积的液流速率与太阳总辐射、大气温度、水汽压差呈极显著正相关关系,与相对湿度呈负相关关系。其相关系数绝对值顺序为太阳总辐射>大气温度>水汽压差>相对湿度>风速;银白杨边材面积与胸径之间存在着显著的线性相关关系,相关系数为0.834,单位边材面积的液流速率随树干胸径的增大而减小。A thermal dissipation probe （TDP） was used to measure the sap flow dynamics of Populus alba L. xP. talassica in the agricultural development zones of Karamay during July 1-25, 2012. Soil mositure, total radiation （TR）, air temperature, relative humidity, water vapor pressure deficit （VPD） and wind speed were measured at the same time.The results showed that： Diurnal variation of the sap flow displayed a single peaked curve on sunny days, while it displayed a muhi-peaked curves on cloudy days.The average value of sap flow was 0.6059 L/h.Sap flow velocity per unit sapwood area was significantly correlated with TR, air temperature, and VPD and was negatively correlated with atmospheric relative humidity.The ranking of correlation coefficients was TR〉air temperature〉VPD〉relative humidity〉wind speed.Sapwood area and diameter at breast height （DBH） were significantly correlated （r= 0.834）, and the sap-flow velocity per unit sapwood area decreased with increasing stem diameter at breast height （DBH）.

关 键 词：气象因子 干旱荒漠区 银白杨 树干液流 

分 类 号：S792.11[农业科学—林木遗传育种]