ROREST RESEARCH 

About: ROREST RESEARCH is an academic journal. The journal publishes majorly in the area(s): Cunninghamia & Gall. Over the lifetime, 40 publications have been published receiving 78 citations.

Biomass Equations for Rubber Tree in Southern China

Abstract: Allometric regression equations for biomass prediction were developed fortrees of Hevea brasiliensis in the Leizhou peninsular region of Southern China. Individual treecomponent dry weight,such as leaf, branch,bole,root, bark, total aboveground and under-ground,whole tree were regressed against girth(at breast height 1.3 m)and D2 H(D di-ameter at breast height,H total height)using 49 sample trees. The statistical comparisonshowed that the regression equation against girth was better than that of against D2H. In 25-year-old rubber plantation,approximately 80%of tree biomass was in the aerial part and20%in the roots. The bole,branches, roots and leaves constituted about 52.0%, 23.6%,19.7%and 4.7%of the whole tree biomass respectively.The revised biomass table using re-gression equation against girth was developed.

Introduction and Provenance Test of Acacia crassicarpa

Abstract: Acacia crassicarpa was introduced in 1985 to South China.8-year species trialof A.crassicarpa shows that it is a fast-growing tropical legume tree without serious insectand pest damage.It is a suitable tree species for pulp and timber plantation.It could beplanted in the vast tropical and southern subtropical regions in China where the mean annualtemperature ranges 21～24℃,mean annual rainfall 1 000～2 000 mm without frost.Themost suitable sites may be low hills,mountains and the coast sandy soils where typhoon dam-age is not serious.The most suitable seed sources of A.crassicarpa come from the low eleva-tions of PNG.The MAI of height is 1.2～1.9 m and MAI of DBH is 1.7～2.9cm. It startsflowering and bearing fruit at age 4～5year.1 000 wt.of seeds is 22 g.A.crassicarpa is atree with shallow root system whose root system concentrates on the upper 10～45 cm layerof the top soil.It is not wind resistant.The fresh leaves of A.crassicarpa contain 2.168%N,0.094%P,0.146%K,0,424%Ca, 0.172%Mg.It can enrich soil because it is a nitrogen fixing species.

Genetic Variation in Basic Wood Properties of 36 Clones of Populus deltoides

Abstract: year-old clones of Populus deltoides Martr from the gene-pool inChangqing County,Shandong Province were used as testing materialTheir wood basic den-sity,fiber length,tree height and DBH were measured and analysedThe results show:asignificant variance was observed in 4 traits among the 36 clones 5 fine clones with higherdensity,longer fiber and faster growth were selected to be the best clones by optimizationGenetic variation of wood basic properties and tree growth were analysedThe broad-senseheritabilities for basic density(032),fiber length(040),tree height(043),DBH(071)of 36 clones were calculatedThese results showed that these basic wood properties and treegrowth were under moderate and stronger genetic controlThere was a slight negativegenetic correlation between the wood basic density and tree growth rate, as well as a positivegenetic correlation between the fiber length and tree growth rate The traits of density andlength can be selected independently The genetic parameters of wood basic properties andtree growth were put forward for the introduction of P deltoidesMoreover,the wood basicdensity, fiber length,tree height and DBH of female and male trees were comparedThe dif-ferences of 4 traits between female and male trees were not significant

A New Species of the Genus Diprion(Hymenoptera:Diprionidae)from China

Abstract: In the present paper a new species of the genus Difrion,D. jingyuanensis isdescribed, which is a serious pest of Pinus tabulaeformis Carr.in Gansu and ShanxiProvinces in China.Diprion jingyuanensis sp.nov.Female: Head black;antenna black with scape and pedicel yellowish;palpi deep yellow;mandible dark red except for dorsal surface. Thorax black with prothorax deep yellow;winghyaline;stigma yellow apically and black basally,in the black part there is a white spot;veins dark yellow, Abdomen black with terga 1,2,8,lateral parts of tergum 3;and sterna3～5 deep yellow. pubescence on head and thorax deep yellow.Anterior margin of clypeus deeply and arcuately emarginated;rami of segments 7 to 11about as long as each length of their respective segment;median fovea oval, moderatelydeep;lateral,coronal and transverse sutures distinct;OOL:POL: OCL=2:1:1.3.pubescence on clypeus,prothorax and mesonotum longer and denser,Lancet as in fig.1-1 punctures on head and thorax coarse and dense,nearly rugose; punctures on abdominalterga very sparse,on lateral parts of terga and sterna dense and coarse.Body length about 10 mm;antenna 21 to 23-segmented,apical 2～3 segments without raml.Male:Color of head,wings and pubescence similar to female;thorax and abdomen en-tirely black;legs black with tibiae and tarsi deep yellow;rami of segments 1 to 11 each about10 times length of their respective segment;OOL :POL:OCL=2.6:2.6:1; punctureson thorax coarser and denser,rugose;punctures on abdomen coarser and more numerous.Penis valve as in fig.1-2.Other characters as for the female.Body length about 8 mm;antenna 23-segmented,with apical 1～2 segments without rami.Holotype♀,Gansu Province,Jingyuan County,30.Ⅵ. 1989,Zhang You leg;Allotype♂,same data as for holotype.Paratypes 4♀♀,1♂,same data as for holotype. Paratypes13♀♀,2♂♂,Shanxi Province,Qinyuan County,Ⅳ,1992～1993,Zhao Jinlong leg.Thetype specimens are deposited in the insect collection of the Forest Protection Research Insti-tute,the Chinese Academy of Forestry.Hosts:Pinus tabulaeformis Carr. The new species resembles Diprion liuwanensis Huang et Xiao,but differs from the lat-ter in the color of the fore wing and the lancet and penis valve.

Study on the Habit of Absorbing Replenishing Nutrition of Batocera horsfteldi and Its Relation with the Host Trees

Abstract: Shoots of several tree species or shoots of a sole tree species were used to feedthe adults of Batocera horsfieldi separately for trials of absorbing replenishing nutrition. Theresults of the trials show that the adults fed up with the shoots of Rosa multifora and Fraxi-nus chinesis absorbed more nutrition with longer life-span than the adults fed up with theshoots of Salix matsudana,Pterocarya hupehensis,Populus deltoides cv.“Lux”(Ⅰ-69/55)andUlmus pumila; and only those adults fed up with rose and ash were able to lay eggs. Theamount of replenishing nutrition taken,life-span and amount of oviposition are in positive re-lationship with the sugar content of the plant shoots taken by the adults. The use of rose asbait tree in poplar plantation to attract and catch the adults could decrease the percentage oftrees attacked by the beetle from 94.4%to 17.8%.