Sapflow of hybrid poplar (Populus nigra L.×P. maximowiczii A. Henry ‘NM6’) during phytoremediation of landfill leachate

Poplars are ideal for phytoremediation because of their high water usage, fast growth, and deep root systems. We measured in 2002 and 2003 the sapflow of hybrid poplars (Populus nigra L.×P. maximowiczii A. Henry ‘NM6’) planted in 1999 for phytoremediation of a landfill in Rhinelander, WI, USA (45.6°N, 89.4°W). Mean sap velocity per tree was 100±10 and 120±10 μm s−1 for 2002 and 2003, respectively. Mean sapflow per tree was 1.4000±0.1698 and 5.6760±0.2997 kg h−1 for 2002 and 2003, respectively. Sapflow was negatively correlated with temperature, wind speed, precipitation, and vapor pressure deficit for both years (0.002