The Effect Of Three Cutting Regeneration On The Highness Class Stucture Of Castanopsis Carlesii Community

The influence of forest on which the cutting regeneration have bearing has been concerned in forestry ecological research in recent years.Castanopsis carlesii community was a typical and stable diamax community in subtropical area,However,there are discrepancies among restorations due to different cutting regenerations.This paper studied on Castanopsis carlesii community in Wuping of Fujian province.Surveying in the natural forests in 1993 and forests which were by the ways of selective cutting regeneration,natual regeneration and artificial regeneration in 1995 and 2005,the methodology of belt net and the comparative analysis methodology of layered frequency,the number of stems,diversity index,community sharing degree,theβdiversity(Cody index,Morisita-Horn index,Bray-Curtis index,Routledge index)and niche were used in system sampling and studied the distribution of its replacement of building species,succession to show the change discipline of the forestry dynamic along different phases of three cutting regeneration.Comparing the effects of highness of forest by three cutting regeneration,This paper provides theoretical basis for the regeneration and restoration of subtropical species.The findings are as follows:1.C.carlesii was the dominant species in every highness of natural forests in 1993, Castanopsis carlesii of forest by selective cutting regeneration in 2005 is the dominant species in every highness,C.carlesii of forest by natural regeneration in 2005 is also the dominant species in every highness,C.carlesii of forest by artificial regeneration in 2005 is distinct.So it shows that selective cutting regeneration and natural regeneration can both promote the restoration of the C.carlesii community.2.The lost stabe rates of community and dominant species among three natural forests in 1993 in and forests which were by the ways of selective cutting regeneration and natural regeneration are large(＞55%).The lost stabe rates of community and dominant species of artificial regeneration in 2005 are small(the lost stabe rates of community:33.2%,the lost stabe rates of dominant species:20.01%).There is no eminent discrepancy among the community sharing degrees of natural forest in 1993 and selective cutting regeneration forests in 1995 and 2005(1993:36.97%,1995:18.28%,2005:39.71%).The community sharing degree of natural forest in 1993 is larger than the value of forest of natural regeneration in 1995 which is smaller than the value of forest in 2005(1993:36.97%,1995:18.28%,2005:39.71%).The community sharing degree of natural forest in 1993 is larger than the value of forest of artificial regeneration in 1995 which is larger than the value of forest in 2005(1993:30.46%,1995: 15.97%,2005:9%). 3.The Correlationship between indexes(β_C,β_R and C_N)and highness are negative among three natural forests in 1993 and forests under three cutting regeneration in 2005,but there is no correlation between C_MHindexes and highness.There is no eminent discrepancy inβ_C1,β_R1,C_N1,C_MH1and totalβ_C among natural forest in 1993 and selective cutting regeneration forests in 1995 and 2005.There is no eminent discrepancy inβ_C1,β_R1among natural forest in 1993 and natural regeneration forests in 2005.The indexes(C_MH1,C_N1and totalβ_C)of natural regeneration forests in 2005 are larger than the values of natural forest in 1993.The indexes(β_C,β_R,C_MH1,C_N1and totalβ_C)of artificial regeneration forests in 2005 are smaller than the values of natural forest in 1993.4.The nichebreadthes of C.carlesii is maximum in three natural forests in 1993.The nichebreadth(0.33)of C.carlesii is the maximum in the selective cutting regeneration forest in 2005,indicating that the C.carlesii has become the dominant species in community.The nichebreadth(0.3)of C.carlesii is in the second place in the natural regeneration forest in 2005, indicating the C.carlesii has been becoming the dominant species in community.The nichebreadth of C.carlesii is distinct in the artificial regeneration forest in 2005,indicating that the community is difficult to be restored to the natural forest.5.The percentages of which niche similarity is more than 0.6 among three cutting regenerations in 2005 is larger than the values of natural forests in1993,however,the margin (11.2%)of natural regeneration is the maximum.The percentages of which Lhi and Lih are more than 0.1(Lhi:47.1%,Lih:50.29%)in the natural regeneration forest in 2005 is larger than the values(Lhi:40.87%,Lih:39.3%)in natural forest in 1993,indicating that natural regeneratin can promote plant species to share the recourses in the community,and C.carlesii has drastic competition with other species.The percentages of which Lhi and Lih are more than 0.1(Lhi:42.43%,Lih:30.74%)in the artificial regeneration forest in 2005 is smaller than the values(Lhi:49.26%,Lih:42.39)in natural forest in 1993,indicating that artificial regeneratin can promote plant species to be distinct in the community,and to reduce the efficency of highness recourses.