Four-armed airflow olfactometer was used to determining the foraging behavior of Pteroptrix longgiclava (Girault) (Hymenoptera: Aphelinidae) and Encarsia gigas (Tshumakova) (Hymenoptera: Aphelinidae) to the essential oils which emitted from the healthy bark of Populus pseudo-simonii ×P.

Cytospora chrysosperma and Erwinia herbicola made great changes on chemical quality of Populus pseudo-simonii×P.

Sprouting of Populus deltoides×P.cathayana;

Growth of Populus simonii×P.nigra Which Were Cultivated on Different Types of Chernozem;

Study on the Sensitivity of Hygromycin on Populus simonii×P.nigra;

Determination of Felling Period of Short-Period Pulp Plantation of Populus simonii×P.nigra;

Growth Characteristic of Populus×xiaohei Plantaion in Sand Land of North China;

Biomass and Distribution Patterns of Populus×xiaohei Plantation in Sandy Land of North China;

Effects of Planting Density on Growth Increment of Juvenile and Mature Wood in Populus×xiaohei;

Study of Young Growth of Populus simonii×nigra on Soil Water Consumption;

Water Productivity of Populus simonii×nigra and Pinus sylvestris var.mongolica Stand in Middle and Lower Reaches of Nenjiang River;

Preliminary Report of Fertilizer Test of High-yielding Plantation of Populus simonii×nigra;