Studies of trunk injection fertilizing in pear trees;

The theories,injection apparatus,(characters),applications and key techniques with the techniques of trunk injection of chemicals were introduced in detail.

Trunk injection can add quickly the nourishment that the plants need urgently but get hardly from the soil or spraying, and have applied in some respects, and can decrease the environment pollution.

Characteristics of Precipitation Redistribution and Stemflow in Quercus acutissima Mixed Forest in Miyun, Beijing;

Characteristcs of Precipitation and Plantation and the Stemflow of Constracted Forest in Qianyanzhou Experimental Station;

Characteristics of precipitation and forest stemflow of Dongling Mountainous area;

Effects of forest on chemicals of precipitation and total suspended particles of stem-flow in Jiufeng National Forest Park,Beijing.;

The contents of 8 nutrient elements(N,P,K,Ca,Mg,Cu,SiO2) were measured in the rainfall of Changsha City and in the stem-flow and throughfall of its urban forest of Pinus ellotii.

The concentrations of 9 nutrient elements(N、P、K、Ca、Mg、Cu、Zn、Mn、SiO2) in stem-flow,and rainfall were measured in 22～25 years old Cinnamomum camphora,Pinus taeda,Quercus aliena,Michelia macclurei from April of 2003 to July of 2004 at Zhuzhou.