The Impacts of Cutting intensity on the Growth of Larch Forest;

This growth model was then applied to study dynamic varivation of diameter grade,and effects on different cutting intensity to periodic average increment,annual yield and refaunation time were also analysed.

The choice of felling intensity plays the key role in the forest management.

Through real surveying material, the paper determines the influence of forest density and felling intensity to stander damage and finds out changing regulation.

Seasonal response of soil enzyme activity to thinning intensity in aerial seeding Pinus tabulaeformis stands;

Effects of Thinning Intensity on Aerial Seeding Pinus Tabulaeformis Stands;

The resuhs showed that the mortality rates of the remaining trees were lower at the mid-thinning and high- thinning intensity.

The results indicated that: average DBH and increasing rates of volume for broad-leaved trees increased with the increase of intermediate cutting intensity,but influenced a little on height;the growth of Pinus koraiensis s DBH and height were promoted obviously as the increase of intermediate cutting intensity,but declined just in the year of the first intermediat.

The intermediate cutting intensity experiment was conducted in the Cunninghamia lanceolata stands at the age of ten on Zaoxia Forest Farm of Fengxin County, Jiangxi Province in June, 1976 and was finished in October, 1996.

In the intermediate cutting intensity experiment of the Cunninghamia lanceolata Plantation for 20 years,the change pattern of stand natural thinning through the different intermediate cutting intensities was studied,the relationship between tree number of the natural thinning and the stand intensity & site conditions was revealed,the mathematical equation Mk_1·k_2 of natural thinning lines of C.