| By using sites investigation and experiment analyses, the impacts of skidding road soils, diversity in grass and regeneration, which are caused by animal skidding and tractor skidding at HongShi government-owned forestry farms, are studied in the paper. The research results are showed as the following:1.Under two kind of skidding way the content of skidding road soil organic content and the content of K had the drop of great degree at the first year, but the content of N, P increased by the tractor skidding way , animal skidding dropped, along with the change of skidding year, the tendency organic content and the content of K started to restore gradually, then the content of N, P continued to drop; Under animal skidding way skidding road soil organic content and the change of the content of K are similar with the change under tractor skidding way , but the degree of drops is lower than that under the tractor way, moreover the speed of the whole restoration is quicker. The change of the content of N, P is fluctuatation, but the overall tendency is drops2. The nutrient of the skidding roads increased at natural condition. At the same time, the difference between each part of the skidding road that caused by skidding become smaller.3.The soil aggregates' structural damage(p) between forest and skidding road is a little variant in Animal skidding(AS) and tractor skidding(TS)(67.76%<74.48%).The p change at the three parts of each skidding road are: AS(-0.0408)>TS(-0.0115);4. Water-stable's fractal dimension is increased a bit from the upper to the bottom, but AS's change is faster than that in TS(0.9456>0.9189);5. Both skidding methods have a same trends: fractal dimension in skidding road is larger than that of the forest (2.194>2.146)6. After skidding, the species' diversity of grass has a little difference between forest and skidding road (1.12:1.06);7. The values of diversity and evenness of AS is higher than that in TS(1.34>1.15; 0.49>0.38), not richness (0.89<1.02);... |
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