SCIENTIFIC ABSTRACT YURKEVICH, A. YA. - YURKEVICH, I. D.

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• Collection: Scientific Abstracts
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• Document Creation Date: November 2, 2016
• Document Release Date: September 19, 2001
• Sequence Number: 15
• Publication Date: December 31, 1967
• Content Type: SCIENTIFIC ABSTRACT

_MM1M-*--A-U._kLnd* m1d. nauk
Trauma In general disease Incidence of the population of Leni '"ad
Ortopop tram i protez. no.l.&64-68 (MIRA 15:21
if I-a organizatsio=o-mstodicheskogo otdola (zav. Prof. S. ya.
Freydlin) Leningradekogo instituta tmvmatologii i ortopedii
(dir, Prof. V. S..Ralakina)
(LENINGRAD--ArCIDENTS)

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TITLE: ProVam Evaltiatior aM Review Tenchniq-w (PERT) - Che of the Matio,3g or
of Deveiopin, 5yst-ms
SOUCLCZ: Morskoy sbornik, no. 9, 1965, 25-32
T071C r-'--Z, industrial manacruimt, job analysis
1 ABS-31AMN -15-tq wiek c'l D. M. St' -in-!' kT. K. ?Ajri*v, 7'M_r_-0-rn Kqnq ~--ll
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is system analysis. After a mors exa,it evaluation of the mgram- and a closer
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SUBM DATE: OG/
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YUROVICH'I.A.
Geological structure of,the central part of the rolyma 'liver
basine Sovageols no*26,.3-21 147. (HLn 8: 8)
I]Colyma Valley--Geology)

V, S N M M, 14-41
'Minjefits hi 1114'eti-siarly wthliffif alM Otte i~dv 1,
IIIFOYCd lklltbStikth-t~ Air WAMICIII. ItAdIS W tIW I'MA-111~0#11
jimt t.ttolcunt-guirinitig Iw,N itimild pirdumitimitty roll,
(Ain diffk-uttly mcidituttle fiLiferiak, and tri-stisvIv surAll
altils. of uJOY oxiihijbir 1111.
44 Uvrr 101 "Ifilticitit stwChiml, flIdw-ktc4 (11-6K ON. r.Aqdv
00,HUMV S4,111441ICN4 (1q-IVAW IfightlY. Nit VIC 001101111Y
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Wit Ohr flKli'vt jj4I.-
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trifewill. infKtmfcrl~ 4d 1111%. staInfify wofff (?I-- I-aft*-
1114t couditia% The ow)(f4,11vt ox".41pin cApi.
wetv fICHIC %itht).3 'Vcf0. in 1:1 ill th'. C.94 Im .1
VW ftc f, mill.. of Ily II'm N C(Ch fkr Ini". At

VIMIRI Vovw,. prefessor; GORMU,- Aol.; noways To.ffe-: VANUCaROTA. TO.A.;
XMMVA, N.A.; RADCBMIKO. O.A.; 2MZOVA, T,S.; RM. 1.I.: -
MICH, T.G.; SKADMMY, S.N.; ULIM, VA.; FOIM, K.I.; FORM, T.Bq
Results of the comprehemsive.. strdy of Contemporary analogUos of oil-
bearing factes. Lrudy VIrIGNI no.2rlll-121 151. (nHA 10:4)
O%troleum geologr)

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rmlY CUT VkS cunUl OZ7% ftrid C -R% C. -41
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VEM, V.V., professor; GIHZXHG-&VUD1GH9TA, T.L.; GLEBOYSTATA, Te.A.;
GORSrATA, A.I.; Z-AKffA IV, A.A.; MMCHAWYA, Ye.A. [deceased];
HMTIYWA, V.L.; ROHK, I..J.; SATICH. T.G.; TALDYKIMA, U.N.,
FOXIIIA, S.I.; YURKqICE[;-j';A.;-H1RCHIHK, H.F., professor, red&ktor;
.LIVOTA'- L.A.;-Wr o-r-; lt~v, AWY., tokhalcheskly reddktor..
(Accumalation and tranoformation of organic-substances in recent
aea sediments; In the llghtLof the problem ~or oil origin) Nakoplenie
I proobrasovanie organl6cheskogo vashchestva v savromennykh morskikh
osadkakh; v aspekta problemy prolekhozMenita nafti. $bdrAik statel
pad red. Hol?.Hirchink. Hoakwa, God. nanchno-tekha. W-vo naftlanot
I garno-toplivnoi lit-ry, 1956. 342 p. NLRA 9:6)
l.Vaesoyuznyy nauchno-Issledovatbl'sidy goolegorasvedochW institut.
2. Chlen karraspondent4ll SSSR (for Hirchink)
(Sapropelites) O~Rrine biology) (Petroleum geology)

2 J-~~,

i Z ;:ia: r :?!.Itzc, dhe a~.IL of Y!Ci-
by dtca-fing,

III` MI,
ME, F

TURKNICH, I.A.
i'~~ Changets In the oxidation otate of Cretaceous rocks in the
eastern pro-Ural region. Dokl. AN 939R Ill n0-3.-.647-648
9 156, 10:2)
l.-Institut, nefti Akademli nauk SSSR,
Pral Mountain region--Rocke-Analysis)
Valence (Theoratical,chemistry))

Nesozoic palsogeography of the Ural region of the-Wast Siberian Plain.
Daki.AN SM Ill no*-4:870-873 D 1564. (HM 10:2)
1. Inatitut nefti Akademii nauk SM. Predetavleno akedemikom S.I.
Mironevyu.
(West Sibertem Plain-POdeopoomphy)

3(4) PHASE I BOOK EXPLOITATION SOV/1539
Yurkevich, IQ;Dif Andreyevich
Issledovaniya po metodike fatsiallno-gi.-okhimicheakogb izueheniya
osadochnykh porod; v prilozhenii k zadacham.geologii neftl
(The FaciesGeochemical Method in the Study of Sedimentary Rocks;
Applied to,,,-Problems in Oil Geology) Moscowg Izd-vo AN SSSRj 1958.
112 p. 1,50b"C'6pies printed.
Sponsoring Agenoy: Akademiya nauk SSSR. Institut nefti.
Reap. Ed.: G.I. Teodorovich; Ed. of Publishing House: B.".M. Feodotl-
yev; Tech. Ed.: I.F. Kuzlmin.
PURPOSE: The book is intended for petroleum geologists and students
of oil genesis.
COVERAGE: The problem of the distribution of organic material in stra-
tigraphic-columns of petroliferous provinces was extensively inves-
tigated by numerous Soviet researches, among whom were A.D. Arkhan-
gellskly, G.M. Mikhailpvskiyj and A.F. Dobryanskly. ~,ab6ratory re-
search and studies by NiM. Strakhov, Z.L. Maymin, Yurkevich and a
Card 1/4

The Fac ieIa Geochemical Method (Cont.) S07/1539
number of-foreign researchIera have been inconclusive. Better re-
sults are expected from a study of environmental conditions and
the transformation of organic matter under natural'condition3. Re-
search along lithological-petrographic, mineral.. and geochemical
lines, linked to various characteristics of petroliferous horizons
may facilitate the solution of the problems posed. Reported here
are the results,of-analytical studies conducted by the author. He
expresseshis gratitude to N.G. Fesenkova, N.A. Kozyreva, V.A. Fey-
rabent and M.I. Perevedentseva for their participation in this work.
There are 13 figures, 43 tables and 100 bibliographic references of
which 91 are Soviet and 9 English.
TABLE OF CONTENTS:
Introduction 3
Reducing Capacity and Its Study 5
Bibliographic review of studies onthe reductibility of rocks 5
Determining the reducing-capacity by separate oxidation of the
mineral and organic components of a rock 12
Card 2/4

The Facies Geochemical Method (Cont.) SOV/1539
Eliminating thereduced-mIneral complex from',the rack 14
Oxidizing the rock to determine its capacity 21
Determining the content of organic material 'and the reducing
capacity simultaneously 28
Examples of studies of the reducing capacity of rocks on
natural objects 31
.
Practical. suggestions for performing analyses, 44
Reagents 44
Equipmentand processual technique 45

Geochemical Indices in Determining-the Characterof Sedimentation
In Ancient Basins 56
Preliminary description of lithological-geochemical rocks by,
C02 and the insoluble acid residue 56
Some geoche.mical indices necessary in establishing the character
of sedimentation in ancient basins 62
Utilizing aqueous Infusions to.ftmancgWon on the character of
th-- sedimentation basin 66
Determining those components of rocks which are easily solu-
able in water by using aqueous Infusions 91
Card 3/4

The Facies Geochemical Method (Cont.),, SOV/1539
Examples of studies of geochemical indices of the salinity ofa
sedimentation basin 98
Practical suggestion'for determining the parameters In the
ratio rcl 1-
HGO1 rC02-
.3 3 107
conclusion
Bibliography.
AVAILABLE: Library of Congress
MMISfm
5-8-59
109
110
Card 4/4

AUTHORS: Yurkevich, I. A., Peyrabent, V. A. 20-119-3-41/65
TITLE:, Certain Rules Governing the Variations of the pH-Values of Rocks
-of East-Murallye (Transurals)
of the Meso-Ceaozoic Stratun
(Nekotoryye zakonmernosti izmeneniya pff porod mezokayaozoyakoy
tolshchi Vostochnogo, Zaurall ya)
PERIODICAL: Doklady AkademiI. Nauk SSSR, 1958, Vol. 119, 1Tr 3, PP- 540-543
(USSR)
~ABSTRWT: The develolcmentand direction of many processes In nature de-
pend on the reaction of the medium. The pH-values of natural-
waters and ground sediments can favor the concentration or dis-
persion of chemical elements in sediments. Thus the direction
of authigenous mineral formation is to a certain extent pre-de-
termined (refs 3,4,6). From this point.of view the study of
the pH-values can be Important for the explanatioa of the for-
mation conditions of rocks which has hitherto been neglected be-
cause of the general opinion concerning an extreme mobility and
variability of this parameter. The underestimation of a sys-
Card 1/4 tematical study of the VH-values as one of the

Certain Rules Governing the Variations of the pff-Values 20-119-3-41/65
of Rocts of the-Meso-Cenozoic Strat,= of East-Zaurallye
(Transurals)
parameters ofthe formation conditions of mineral oil
containing strata (refs 2,5) is not justified at all. Frcm
the final conclusions in these refereuces.results a good
correlation of*the pH of the water extracts with other
parameters on large suxfaces. Thus the alterations of the
sedimentation conditions are to a certain extent reflected
by the pff-values of the rocks in question. In reference 2
and 5 is said in this context that these values characterize
the pH-values of the waters in the sedimentation basin
during the sedimeatdtion of the,strata In question. It is#
however,'weli kn,wa that the hydrochemical parametersO
smong them also "t-Ne pH-values of th6 bottcm waters of the
recent sias, aad of the mainwater mass differ considerably.
Therefore the pH-3,--vel cannot be considered under the
abovementioned aspects (refs 2.5), it can be uzed only for
the study of the ground sediments.' For these reasons the
authors Investigated the pH-values not in extracts, but in
suspensions with a cmparatively small relation of the
solid and liquid phase (water : rock 4 1). The
Card 2/4

Certain Rules Governing the Variations of the ifi- 20-119-3-41/65
Values of Rocks of the','4eso-Cenozoic Stratum of East-Zaurallye
(Transurals)
pH-values were measured potenticm trically by means of a
glass electrode. The data contained In table 1 as well as
-those-of reference 1 for single minerals show that the
pH-values of the same rock sample differ considerably in
suspensions and water extracts. The differences are not
equal for the- single rock samples. The individual peculiarities
of the rocks are expressed best by the p&values in
suspensions. The data of table 2 show a picture of the pH-
modifications which are rather typical of the cross*-
sections of the Meso-Cenozoic sediments of-the western
part of the West Siberian lowland. Though the single cross
sections Ue several hundred kilcmeters apart, they
disprove the above mentioned conceptions concerning the
high mobility of the pH-values. Even the averaged values
of table 2 show that all Investigated cross sections are
differentiated dbNiously according.to the modifications
of the pH-values in a series of strata. The indicating
horizons and strata for the major part fit into the frame
Card 3/4 of stratigriLphic subdivisions. Albian, Turonian-Congac.

Certain Rules Governing-the Variations of the pff-Valies 2o-119-3-4i/65
of Books of the Hooo-Cenozole Stratwit of Falt-Zattrallye
(Transurals)
and Eocene have lower pH-values than these of the strata
below and above. The pff-level is higher for Lower Cretaceous
than for younger ond TertIW rocks, The pff-values are
gradually reduced fraa Senorian Stage on words. In all
Cretaceous- and Tertiary Sediments the lowest pH-values
were in the north (Berezov), the higtLer cmes in' the South.
Therefore the modifications of the 19-values In the cross
nections and in the regional plan are by no means arbitrarys
but are subjected.to certain rules which apparently govern
the modification of-the sedimentation and the diagenesis
of the sediments.
There are 2 tables and 6 references, all of which are Soviet.
ASSOCIATIOU: Institut nefti Akademii rauk SSSR
(Petroleum Institute, AS USSR)
PRESENTED:- December 6, 1957, by S- I- 14irOnov, Membek, Academy of
Sciences, USSR
SUNUTTED: December 3, 1957
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PHILSE I BOOK EXPWr=103 SOV/2064
Yurkavichplosif Andreyevich
-Fatsiallno-geoWmichaskays, kharelcteristika, mezo-kaynozoyokikh otlozhenly-Vostochnogo
Zourallyn (Geochemical and ftsies ftareateristics of Heso-Cenozoic Sediwnts
of the Eastern Transuraa) Kas(saw,, lzd-vo AR SSR;. 1959. Ilk p, Errata slip
inserted. 1,500 copies printed,
Sponsoring Agency: Akadwdya nauk SSW. Inatitat nefti.
Reap , Ed.: ~ 8,1. Mlronov,,. Academician; Ed., of Publishing House: S,F. Shobolov.;
4;ch. Ed. A,P, ftsem .
Tb1s book Is Intended for geologlsts,, geachemlstst and research workers
concerned with the deve3.olment and structure of oil-bearing beds.
COVERAGE: This-vork is a geochemical-facies ana34ais of possible oll-bearing beds
of Mesozoic and Cenozoic sedliutnts in the Ural regions of the Western Siberian
lowlands. The author contendA that the basic task of geachemical Imestigations
is not to search for oil-bear:big source beft,ditectlys, but rather to add nw
inf6rmation to our knowledge ar the facies characteristics of sediments and. there-
by to Improve our understandliq of the geological development of the region end
Card l/ 4

Geochemioal and, Facies Chexaateristics (Cont
this, Proceoceo imlved in the i fomfton and accumilation of oil. Work vos
carried out wording to -the progrou est-021shed by the Eastern Coubined Oil
-and Mw 0xpedition of the Ana4AmW of Sciences headedby Corresponding Vmiber
S.P. Fedokov. Chemical sml,"da were perfoi~med by T.L. Vinagradov.. N.A.
Kozyrevm, Hol, Ferevedenteavej ond V,A, Tayrabent, All krw staff witera of
the laboratory for the Otudy Q,:r OLI-Genesis hea&I by Academician 8,1, Hironov.
The &uW= thanks L.I. Rovninp ablef geologist of the Tyura-enneftegeologlya Tmt,.q
and N.F, Tvojev, director of the VNIMU expedition, There are 57 refereraes
-dD'-vhi*fi are Soviet and I English.
TATME OF Comma-,
General Information on the Region 5
Stratification of Meso-Cenozoic Sediments
The Triaosic-JVrwaic Group 3.1
J'urassio Sediments 12
CjLrd 2/A

Geochealcal and Yaclas Charuteristics (cout.)
Crotgaeous Sedimats
Tertiwy Sedlmnts
Problem in Reoewah Msthodolcgy
The.Qeochemictl Maracteristics of the Maso-Cenozoic sediumts
The Ch*2y&bimk (lutoulfams Region
Za;wodoukovvk
Tymn' Region and the Adjoining Aram
Turinak
KuznatGoTO
Lewhi
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a-eachemical aza'racies .00/2064
61
66
71
Hydrogen-index (ra) of Meso-cenozoic Sediments 76
Regulaktiall in-the Variation of-the 0eachemical ObArd4teristfe: InderAs of--
Roaks in the tutern TransuriLl Area 90
On the Prenanae of Oil Formtion Conditions Within the VASOzoic Column of the
Eastern Transural 103
Bibliography-, 113
AYAMMt Library of Congress

7-16-59
Card 4/4,

JOIKE71CH, it Do
Fircones and natural afforestation of coniferous woods In the Belorussian SSR.
Mensk, Sellmaseektar, 1935. 49 p.

YURKMCITI 1. D. .(Co-author)
See., GniMVYAKOV,_ P. D.
Yurkevich, 1. D. and Chervy2kov, P. D., "Observation of the
fertility of.the hombeam) the ma]~Ie, the asho the linden)
and the black alder in the forests,of tl,.a B*lorussian SSR.,".
Sbornik nauch. tmdov (Belorus. lesotekhn. in-t im. Kirova),
Issue,7j, 1948, P.-133-42.
SO:- U~3736,-21 May 53, (Letopis 'Viurnal Inykh Statey2 No. 17, 1949)*

YV AkElf W 1. b.
- Zakonomernosti V Ras
28994 prostranenii Evonymus. Verru cosa-Scop. Ila Territorii
SSSR i nekotorye istoriche5lde prichirq, obuslovlivayushchie ikh.
Botan. Zhurnali 194c), No 4, S. 395-40'9 Biblog r: 5 408-09
SO: Letopis' Zhurnalinykh Statey, Vol. 39, llo--kva, 1949

~tM!V' Vr-~' 11, T. D.
2~ 522 0 zavII5.1 iio:Ai glittonosnootl j, ~i:-Ioltstooti borooklet,
a borodavchatoc o ot
J. "clivy, Dokla-iy- al-al, nalik 333P, vaya uerhra
'VIT, No -1949, c.
D
4
S"): MTI~FISI 1-9'- 9,

T Ht d a r-4 OFT -,I
tjz re~

-414
BMYrA. S.Kh., kanadat tiekhaicheakikh nauk,:doteent; TINHONOT, A.F.,
kandidat takhniche-i3kikh.nauk, dateent; Ian
I.D.. profs or,
radaktor; ZAKFARGY, V-X-A profe'sisory do or. elfwwSkyarstyannyth
nauk,, -radaktor; AUIXSAMROVIGH, Kh., taTchnichaskiy radaktor
[Hamal, for workero in the logging industry] Spravochnik-rabotnits
legosagotovitallaol; promyshlannosti. Soot. S.Kh.Ruclyka i A.r.Tikhonov.
Minsk, 1955.-7-74
1. Akadentya navak BSSR, Minsk.1natitut lasaf 2, Chlon-korreapoadent
AN 95~ (for Turkaltch)

USSR/Fores try - Biology and Forest Typology. J-2
Abs Jour Referat Zhur - Biolo6dya, no 16, 25:AV9 1957, 69077
Author Yurkerich, I.D., Pyald2ovich, S.K.
Inst
Title Biological Cle.3sification of Self-Sowing Oak.
Orig,Pub Izv. AN BSSR, 1955, No 2, 63-70
Abstract Based on research in forests of BSSR, an effort is made
to classify oak self-sowing based on the number of the
upper shoots in the self-renewed -plant and depending on
the nature of the buds which produce the development.
It has been established that in the shoot formation by
young oaks different buds take part, as a result of
which there are a great number of types of self-renewed
plants (2-, 3-, 4- and 5 uppermost shoots). Tile greatest
quantity of self-renewed plants with several uppermost
shoots are found in cuttings, i.e., under better condi-
tions of illumination. Upon unha ered growth of all
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- - - - - - - - - - - - - - - - - - - - - - - --- - I -- - - - - - - - - - - - - - - - - - - -
USSR/Forestry -'Biology and'Forest Typology.
Abe Jour Referat Zhur Biolo6Lya, No 16, 25_Aug.1-937, 69077
sidewise uppermost shoots they grow fast, giving the
young oaks a bushy form. In the growth of young oaks
surrounded by-other growth a smothering of side shoots
take place. The absence of shade from above gives the
central shoot the ability to grow upward unhampered.
These peculiarities of development of young oaks are
noted not only-in natural renewal, but also in culti-
vated forests.
Card 2/2

M
low
YURMICH, ID., prafavar.
Swepean spindle trees in the White Rassian S.S.R. Yestdi AN
BSSR Ser.bilal.-nay.no.10" 9560 (HraA 9:9)
1.Chlen-karospandeat AN BSSR.
(Itilta ftesla-Spindle tree)

Country USSR
Catct,ory- Forestry. F~)mst Dir,,IoMr and T,,rpolocy.
,,I,bs Jour: RZhBiol.., M., 12, 1958, No 53454
Author -.__XVkevJ.ch., I.D.
Inat t-.S BF.,I()-rMdZ-,-,t-41=
Title f.~f the Effective Terveraturcs Necessary
for th(~, Duvc-lo;?i~cat of the Phenophasoo J.n the Early
anCI JZ'bC. Q?LI'Ij.!I3 Varietica of E:W,,Iish Oah.
OriC; Pub. Dyul. Li-ta bjc),. 'IT BSSH, vyp. 2, 1950 (110,57),
14o-144
Abstract: The studics made in the Belorussian SSR, in the
spruce-hornbocza oak forests and in the spruce oak
forests shmrcd that the late blossozdnC; for-m pre-
doninates ia the southern part of BSSR (Polog'ye),
K
Card V2

COU11trY USSR K
Cateeory: Forest:ry F,)=,Bt Dioloa and Typoloa.
Abe Jour: RZhl3io:L.,, Yo 12, 1958, No 53454
while thu onrly blossomilia fom prado:,unatus in
0
the northem The Into forn is m0ru fm, d of
varmth and 'Cu.; sm.:n of the (~ffectivr- tw--~~;(-.raturcs
necess.,,xry Afor thu &veloijuvrit of the
of thia var.A-;ty -.m considc-rably th-an the
SUMS 01," VIC L;ffLCtiVU tQirL;crvturuS accQss,-.rj for
the devolon:.1out of the saue phenop.1mscs in the
early fo=.i- The 41iisiMificant differcrce in the
sums of the tLi";.)crnA;ures dur.J.nC., thL~ fall )Imio-
phases (thr-- Iar~ -ods of the ripaninC; of thc --corns,
the drop inC, of ccorns, the luaf drop) in&cate an
alnost skailtanc-cus terLdnation of the vc-Letation
period -.n both o--h forms. V.V. Proto~ici-jcv
Card 2/2
X-10

USSR/Forestry - Forest Culti- j-4
'Abe Jour : Referat Zhur - Biologiya, No 16, 25 Aug 1957, 69114
Author : YuatvA~11, Mishnev
last
'Title The Use of Grovth Stimulators and Herbicides in Forest-
Cultivationo
Orig Pub Bestsi All BSSR) Ser., biyal. n., 1956, No 3, 51-61
'Abstract Experiments by the forestry Institute of Academy of
sciences, Byelorussian SM, established that. by treating
green Grafting$ of European spindle tree with weak solu-
tions of 2j4-D their acclimatization is increased. The
optimal concentration of solutions -- 20 mg to 1 liter of
vater. Zie tests as a herbicide of the sodium salts
2,4-D exd 2)4,5-T, of the dimethylamine, trimetbylamine
and diethylamine salts of 2.,4p5-T, also isobutyl. and iso-
anW1 ester of 2,4-D and 2,4,5-T demonstrated that the
main woody species are more resistant to herbicides than
Card 1/2 33
U
-L~

Card 2/2 34

MUROVICIII SO),; 'MMVICH, I.D.
Racheslay rvanovich Ferekha4. Tbstsl. ABISSR. Ar. biial. nay. no.4-,
i85-192 '56 (Km. lorO
.1 Akadamik-selcretarl Otdeloniya biologichaskikh nauk Akadsaii nauk
Belorusakoy SSR.(for Nestarovich). 2. laine-stitellakadomilm-sairs-
tarya Otdolaniya M4~ichesklkh nauk Akademii nauk Belorusakoy SSR,
(for Yurkevich).
(Parekhod, Tiachealay IvanovIch, 1880-).

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7.0
VSSR-J-Fores try -Bllo-logy- - and-
Abs Joar: Ref Zhur. - Biologiya, No. 1, 1958, 1323
Author Yurkavicb, I.D., Gelltman, V.S.
Inat Institute of Forests of the Academy of Sciencez
BeISSR
Title On the t;irch,Forests of Poleslye
Orig Pub: Sb, naLxfhn. rabot po lean.-kh-vu... In-t lesa AN
BSSR.. 1956, No. 7, 55-79
Abstract: A study_~of.the forests of the Polesiye deprei3sion
-has shown-that-birch forests,- by, -the great - n=bar
of derivative types, differ -from pLnie, spruce-J,
oak, and black alder forests. Their prolific
yearly ;Cruit production enables the birch to
spread. The birch forests here represent Betala
C ard 11/~

USSR Forestry. Biology and Typology of the'Forast. K-2
Abs-Jour.-- Ref Zhur~. - Biplogiya, No. 1,- 14958.1323

-..--verrucosa an
d, Betula -.Pubescens -.together. with
-A who e, I e ies of hybr~ rms, 4-i-nins
11 1~ r Id to inc' r~
tc~- "ta
.
one. oi- ~ the other of theoe major, typa-.a. The
warby Urch Ocioupigs the higher spots with dry,
sandy soils, while the fleecy birch grows i-n
the-moister, richer soils. - The hybrid foirm-9
derive- from.areas occupied by the f 1.-,ecy birch
and~are not foundin those covered bythe warty
variety... Pure varieties or the warty birch ar-a
-encountailed rather frequently,, tho6a of the
flepay.birch very rarely. Evidently this-.15
-by e r r flowering; it i-s
aided , the forater Is a Iie
also cons idered a genetically prior form. A
study of the qo=ercial characteristics of the
variou3--'va'rietiea indicaten- tbat.-tho hybrids
grow momquickly to a height and supply great-ir,
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frkc~vi