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Phenotypic Divers.ty of Jatropha curcas.L. from Divers. Origins

Journal of Agricultural s.ience and Technology 2011年第2期5卷 215-219页

作者： F. L. Zapico s. k. nival C. H. Aguilar M. N. Eroy s.ience Department College of Natural Sciences and Mathematics Mindanao State University Fatima General Santos City 9500Philippines Philippine Coconut Authority Region 11 Bago Oshiro Tugbok District Davao City 8000 Philippines

The s.udy was.conducted to as.es. intras.ecific variation/interrelations.ips.and to determine the as.ociation of geographical dis.ribution and phenotypic divers.ty in the Jatropha curcas.acces.ions.s.udied. Ex s.tu morphological characterization of 13 Jatropha curcas.genotypes.from various.s.urces.was.undertak.n us.ng 21 quantitative traits. The generated data was.s.bjected to two phenetic analys.s.methods.（principal components.analys.s.and clus.er analys.s.. Principal Components.Analys.s.（PCA） reduced the collected data to 5 principal components.that cumulatively explained 88.81% of total variance. PCA als. s.bdivided the Jatropha provenances.into dis.inct groups.on the bas.s.of height. The two clus.ering mechanis.s. Average Link.ge-Unweighted Pair Group Method with Arithmetic Mean （UPGMA） and Centroid Method （UPGMC）, divided the provenances.into two major groups.and revealed the divergence of Tubao-Philbio from the res. of the provenances. However, the s.udy failed to adequately es.ablis. a relations.ip between s.atial dis.ers.l and phenotypic divergence in the Jatropha genotypes.implying pos.ible genetic homogeneity for the acces.ions.s.udied. s.reening for more quantitative traits.and the us. of more advanced molecular mark.r technologies.are therefore recommended for a more accurate es.imation of genetic divers.ty in Jatropha.

关键词： Jatropha curcas Principal Components.Analys.s.rithmetic Mean (UPGMA) Average Link.ge-Unweighted Paircharacterization.(PCA) Average Link.ge-Unweighted Pair Group Method withGroup Method with Centroid Method (UPGMC) morphological

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冷生风化作用对边坡稳定性影响(英文)

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冰川冻土 2004年第S1期26卷 60-63页

作者： N.N. Grib V.M. Nik.tin s.s. Pavlov Technical Ins.itute (Department) Yak.ts. s.ate Univers.ty NerungryTown Sakha (Yakutiya) Republic RussiaTechnical Institute (Department) Yakutsk State University NerungryTown Sakha (Yakutiya) Republic RussiaTechnical Institute (Department) Yakutsk State University NerungryTown Sakha (Yakutiya) Republic Russia

The experiment s.ows.that cons.derable influence on dens.ty rock.properties.are s.bjected by nival weathering conditions. The main parameter defining the rock.s.itability for s.lution various.engineering and geological problems.is.its.firmnes. limit on s.ngle axis.*** firmnes. properties.of s.nds.one being in abs.lutely dry condition for k.bak.a s.ite at the beginning of inves.igation was.64.7 MPa, for Nerungri s.ite s.nds.ones.it was.48.7 MPa. The inves.igations.s.owed how much the nival conditions.of cryohypergenes.s.of rock.s.nds.ones.in k.bak.a and Nerungri s.ites.have des.ructive influence in comparis.n with aquale and more over aerale conditions. In the aerale conditions.s.dimentary rock.firmnes. of k.bak.a s.ite decreas.d to 23.2 MPa, in aquale conditions.to 16.5, and in the nivale conditions.to 8.9 MPa. In Nerungri s.ite s.nds.ones.are according to 17.7 MPa, 11.1 MPa, and 6 MPa after 300 freezing and thawing cycles. The common s.nds.one firmnes. decreas. of k.bak.a s.ite was.25 %, of Nerungri s.ite it was.23.8%. Marls.one s.mples.after 400 FTC decreas. to 62% in the nivale conditions.and to 33% in the aerale conditions. After 3～5 years.of exploitation marls.one will des.ruct due to s.ructural and textural inhomogenes.s.up to grus., i.e. it will not meet the requirements.of durability. Judging by the res.lts.of carried out experiment it s.ould be concluded that by cryogenic weathering the s.dimentary rock.0}(s.nds.ones. and rock.0}with s.his.os. lithogenic texture (marls.one) are s.bjected to dis.ntegration. The primary rock.s.mples.firmnes. cons.derably influences.on the dis.ntegration rate.

关键词： weathering conditions s.nds.one firmnes. property

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