Growth And Above Ground Biomass Research Of Cunninghamia Lanceolata In Northern Fujian

In this paper, Cunninghamia lanceolata plantation of state-owned forest farms JiangleCounty of Fujian Province as the research object, the young age forest(5years), middle ageforest (15years), near mature forest (22years), the mature forest (29years) in four standsfor a detailed investigation and analysis, in order to study the different age group growth ofheight and diameter at breast height, according to the actual measured data ofCunninghamia lanceolata Plantation on the part of the organ biomass changes with ageand diameter are discussed, in order to understand the biomass of Cunninghamialanceolata in Jiangle County of Fujian province state-owned forest farm, for the study ofCunninghamia lanceolata’s productivity of this area and provide a theoretical basis, toprovide theoretical reference for futurerelated research the. The results show that:(1) In Cunninghamia lanceolata forest chose to study thetheory of the growth modelof Cunninghamia lanceolata, DBH and treeusing Logistic, Richards, single molecule typecurves, strictsumach four curve of high analysis, according to the R2and specific growthcharacteristics, the best model to determine the Richards function for the growth ofCunninghamia lanceolata. The advantage of fir wood, Naka Yoshiki and pressed DBHgrowth curve was "S" type, the curve of tree height growthdifferences, advantages of woodis monotonically increasingcurve, Naka Yoshiki and pressed wood is similar toparabolashape (ascending).(2) According to the statistics of commonly used continuous distribution hypothesistesting,the results of chi square test: the diameter distribution of young forest only inaccord with Logistic distribution;diameter distribution of forest were accorded withlognormal distribution, Gama distribution, Logistic distribution;diameter distribution nearmature forest respectively with the log normal distribution, Logistic distribution; diameterdistribution of mature forest were accord with normal distribution, Weibull distribution,Logistic distribution, Gama distribution; Logistic distribution hypothesis test to4forestgroup P values were larger than0.05, suitable for young, in4, nearly, mature forestgroup. Cunninghamia lanceolata Plantation along with the age increased theoreticalfrequency curve of the highest value decreases, while the diameter rangegradually.(3) The young forest,. middle age forest, near mature forest, mature forestrespectivelyin8~16diameter,8~21diameter,7~24diameter,12~30diameter in Cunninghamia lanceolata trees accounted for the largest proportion of total number, percentage were94.52%,91.36%,89.20%, diameter at both ends, large diameter(right tail distribution wasmore than the path) order (left tail)distribution number.(4) The stand diameter structure, with the percentage ofdiameter distribution, the chisquare test showed Logisticdistribution, taper and kurtosis is positive, favour largediameterdirection, diameter distribution in the pattern on the discrete values with increasing standage, young forest,middle age forest, near mature forest and mature forestdiameterdistribution is skewed to the right, the number of Cunninghamia lanceolata in mean rightthan on the left of the little fir tree,diameter distribution into the peak state, Cunninghamialanceolata standrelatively concentrated in the mean area.(5) For the biomass of stand calculation model, throughfurther study anddemonstration, the estimation model of biomass of each organ of Cunninghamialanceolata:Trunk: W3=3.62004（D2H）0.91245R2=0.9961SSR=1.021Bark: W1=0.00755D2.48051R2=0.9991SSR=0.166Branches: W1=0.05669D1.68224R2=0.9312SSR=0.044Leaves: W1=0.002612D2.67548R2=0.9921SSR=0.029(6) from Cunninghamia lanceolata tree level biomass of each organ, with theageincreased, increased gradually, changed from large to small in turn for the trunk> bark>branch>leaves,biomass proportion of bark, trunk, branches increases withage, theproportion of biomass of leaves reduced gradually.(7) the overall level of Cunninghamia lanceolata stand point of view,biomass ofdifferent organs in different age group increasedgradually along with the age growth,biomass and stemgrowth greatly, but at a distinct advantage, while the bark,branches,leaves is not obvious, the proportion of biomassand leaf drop gradually. In each age groupwithin the forest,with the growth of biological diameter is increased firstly and thendecreased, the young Lin Hezhong forest in a single peak mountain shape distributionsignificantly, compared with the young forest, stand biomass in the middle age forest andnear mature stand stage with diameter growthchanges than mild, more obvious changes.