This paper used DEM data and vegetation distribution map to analysis the horizontal and vertical distribution of forest fuel,and calculated the fire circle and fire probability based on the fire history data as well.

Nine scenarios were run by the LANDIS model under three fire conditions (no fire simulating, fire return interval of 150 years and fire return interval of 325 years) and three planting strategies(no planting; Larix gmelini planting and Pinus sylvestris var.

The prose in May the Fourth period rebelled to the traditional mode of concept“Writing is for conveying the truth”,while again the prose from 1949 to 1966 under the influence of special ideology re- flected the transmigration of conceptual mode of“Writing is for conveying the truth”.

Taking the transmigration of nightmare which could not be shake off and depending on the magic environment constituted by languages, the hero of the novel, ”I”, a silly young lord wandering between the reality and the virtual reality, frequently alternated his own thoughts between two spaces, broke the regular opposition of the dualism, and built a new thought platform in the selflost.

The experiment got offspring of salt tolerant alfalfa by double recurrent selection and one massed selection,then chose 106 good individual plants from them and mensurated the general combining ability of salt-tolerance.

In order to shorten core length and maintain average head weight,two cycles of recurrent selection were conducted in initial cabbage population C0 derived from fourteen cabbage hybrids.

Four japonica restorer lines with the restoring genes for the genetic-cytoplasmic male sterility including Jijing 85,Ji 524,E180 and E385 have been successfully developed through the breeding method of recurrent selection,using eight japonica PTGMS lines and 28 elite japonica varieties or lines selected from the north cold rice growing area in China as the breeding materials.