The Regeneration And Effect Factors Under The Crown Of North Coniferous Forest In Guandi Mountain Region

The short term experiments are carried out to investigate the effect of three disturbance pattern(protect ,stir and remove withered branches and leaves)on pH,nitrogen(N),phosphorus ( P ),potassium ( K ) of soil and seedling regeneration of Larix principis-rupprechtii forest and Picea wilsonii and P.Meyeri forest on both large resources scale(under the crown of big tree ,at the edge of gap ,in the corner of gap )and the fine resources scale (at a distance of 1m ,2m ,3m to big tree )in pangguangou national reserve in shangxi,in order to supply the theoretic introduction for sustained management。First ,with progression regression method and Path -Anglysis ,the paper analysises relationship between the number of seedling regeneration and soil nutrition ,draws the conclusions as follows:the number of seedling regeneration of Larix principis-rupprechtii shows strong negative correlation with pH NH4+-N, shows little positive correlation with P,K。The number of seedling regeneration of Pices wilsonii and P. Meyeri shows little negative correlation with pH , shows positive correlation with NH4+-N ,P,K ,of which P and K are important influence facters。Second ,compared the effect of different disturbance patter –n on seedling regeneration on large resources scale and shows that :remove withered branches and leaves have strong promotion on regeneration;by Bonferroni test compared wheather the effect of three different disturbance pattern have clear different or not,shows that:only the content of P between protect and stir treatments have strong different。Finally,by Excell the paper compear the nutrition of soil and the number of seedling regeneration in the crown of the big tree,at the edge of the gap,in the corner of the gap,to find that the nutrition of soil at the edge of the gap are not always the richest,but the number of seedling regeneration are always the largest。...