So we measured the white elm tussock moth, an important poplar leaf-eating pest of the Northwest region, studied the energy flows and revenue and expenditure law systematically in its whole life history.

• 因此，本文选定西北地区杨树主要食叶害虫杨毒蛾为试虫、系统的研究了其整个生活史过程中的能量流动和收支规律，研究结果如下：