Energy partitioning and surface resistance of a poplar plantation in northern China

摘要: Abstract. Poplar (Populus sp.) plantations have been, on the one hand, broadly used in northern China for urban greening, combating desertification, as well paper and wood production. On other such been questioned occasionally their possible negative impacts water availability due to higher water-use nature of poplar trees compared with tree species water-limited dryland regions. To further understand acclimation semiarid environments evaluate potential these broader context region's supply, we examine variability bulk resistance parameters energy partitioning a euramericana cv. "74/76") plantation located over 4-year period, encompassing both dry wet conditions. The available latent heat flux (LE) decreased from 0.62 0.53 under mediated meteorological drought by irrigation applications. A concomitant increase sensible (H) resulted Bowen ratio 0.83 1.57. Partial correlation analysis indicated that surface (Rs) normalized leaf area index (LAI; Rs:LAI) increased 50 % conditions was dominant factor controlling ratio. Furthermore, Rs main LE during growing season, even years, decoupling coefficient (Ω = 0.45 0.39 respectively). also major regulator / LEeq ratio, which 0.81 years 0.68 years. All physiological bioclimatological metrics demands were greater than amount through precipitation, highlighting poor match water-intensive like this region.