立地条件对农田防护林箭杆杨水分生理的影响

在箭杆杨农田防护林网中，进行了护渠林内、外两侧林带和三行窄林带的林木材积生长量、水势、蒸腾速率、气孔阻抗和气温与叶温差的整个生长季内各月日变化的测定。结果表明，护渠林的各项生理指标均好于窄林带，护渠林内，外两侧的差别不大。揭示了影响林木材积生长量的水分生理状况和过程。提出了生产中要大力发展护渠林的理论依据。

STUDIES ON WATER PHYSIOLOGY OF THE POPULUS NIGRA UNDER THE INFLUENCE OF SITE CONDITION

Not only in the both sides of the shelter -belt along an irrigational,but also in thenarr0w three- row shelter belt, the daily variations of the timber growth, water potential,transpiration rate, stomal resistance and differential temperature between leaves and air,had been meast1red each month during the whole growing period of the trees. The resultsindicate that ev6ry physiological item in cannal -side belt is better than that in the narrowshelter belt. and almost no difference between two sides of the canal's shelter - belt. Theclarification has been made to explain the physiological process of water, which have agreat influel1ce on growth of timber. Finally, it is suggest that the canal's shelter - beltshould be greatly popularized in the region.