Shear velocity structure in the Aegean area obtained by inversion of Rayleigh waves   总被引：2，自引：0，他引：2  

E. E. Karagianni  C. B. Papazachos  D. G. Panagiotopoulos  P. Suhadolc  A. Vuan  G. F. Panza 《Geophysical Journal International》2005,160(1):127-143

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Full moment tensor retrieval for two earthquake swarms at the Alps–Dinarides junction     

S. Kravanja  G. F. Panza 《Geophysical Journal International》2005,160(2):683-694

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Moment release in the Lower Rhine Embayment, Germany: seismological perspective of the deformation process     

J. Schmedes  S. Hainzl  S.-K. Reamer  F. Scherbaum  K.-G. Hinzen 《Geophysical Journal International》2005,160(3):901-909

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Comment on 'On sensitivity kernels for 'wave-equation' transmission tomography' by de Hoop and van der Hilst     

F. A. Dahlen  Guust Nolet 《Geophysical Journal International》2005,163(3):949-951

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Desert vegetation and timing of solar radiation     

J.C. Walton  F. Martinez-Gonzalez  R. Worthington 《Journal of Arid Environments》2005,60(4):697-707

Timing and amount of solar radiation were examined as factors influencing the distribution of seven perennial plants on a small mountain located in the Chihuahuan Desert. Average direct beam solar radiation fluxes at differing times throughout the day and year were estimated with computer calculations. Principal components analysis was used to reduce the number of solar radiation parameters and include the maximum available information with a manageable number of variables. The remaining solar radiation parameters were compared to plant distributions using redundancy analysis and generalized additive models. Unimodal, bimodal, and monotonic responses were all found depending upon the species and solar radiation parameter. Niche separation at this location depends upon the timing as well as the amount of solar radiation.  相似文献   

Shallow seismic trapping structure in the San Jacinto fault zone near Anza, California   总被引：3，自引：0，他引：3  

M. A. Lewis  Z. Peng †  Y. Ben-Zion  F. L. Vernon 《Geophysical Journal International》2005,162(3):867-881

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Adaptation of seismic skeletonization for other geoscience applications     

K. Vasudevan  D. Eaton  F. A. Cook 《Geophysical Journal International》2005,162(3):975-993

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Characterization of dispersive surface waves using continuous wavelet transforms   总被引：1，自引：0，他引：1  

M. Holschneider  M. S. Diallo  M. Kulesh  M. Ohrnberger  E. Lück  F. Scherbaum 《Geophysical Journal International》2005,163(2):463-478

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Vegetation changes in the Jornada Basin from 1858 to 1998   总被引：1，自引：1，他引：1  

R.P. Gibbens  R.P. McNeely  K.M. Havstad  R.F. Beck  B. Nolen 《Journal of Arid Environments》2005,61(4):651-668

Notes made by land surveyors in 1858 were utilized to estimate cover of grasses and shrubs on the Jornada Experimental Range (JER) and the Chihuahuan Desert Range Research Center (CDRRC) in the northern Chihuahuan Desert in southern New Mexico, USA. Portions of these areas have been previously assessed for historical vegetation dynamics but the entire 84,271 ha assessed in the 19th century has not been examined in total. In 1858, fair to very good grass cover occurred on 98% and 67% of the JER and CDRRC, respectively. Shrubs were present throughout both properties but 45% of the JER and 18% of the CDRRC were shrub free. Reconnaissance surveys, made to determine carrying capacity for livestock were made in 1915–1916 and 1928–1929 on the JER and in 1938 on the CDRRC, show that shrubs had made large increases in area occupied at the time of the surveys. Vegetation type maps were made of both properties in 1998. Mesquite (Prosopis glandulosa) was the primary dominant on 59% of the JER in 1998 and creosotebush (Larrea tridentata) was the primary dominant on 27% of the area. On the CDRRC mesquite and creosotebush were primary dominants on 37% and 46% of the area, respectively. Grass cover has decreased greatly with the increase in shrubs and only shrub control efforts have maintained the once abundant black grama (Bouteloua eriopoda) as a primary dominant on 1% or less of the area on both properties.  相似文献   

Climatic response of thick leaf spruce (Picea crassifolia) tree-ring width at different elevations over Qilian Mountains, northwestern China   总被引：3，自引：0，他引：3  

X. Gou  F. Chen  M. Yang  J. Li  J. Peng  L. Jin 《Journal of Arid Environments》2005,61(4):513-524

Tree-ring cores of thick leaf spruce (Picea crassifolia) taken from four sites at different elevations, in the middle of the Qilian Mountains, in the arid and semi-arid region of northwestern China, were used to develop four tree-ring width chronologies using standard dendrochronological methods. Results indicate that with increasing altitude the chronologies’ year-to-year variations decreased. Hence, the sensitivity of the tree-ring chronologies to climate decreases with altitude. Further analysis showed that the significant limiting factor on tree growth is spring precipitation. Measurements of stomata density and leaf dry weight suggest the species’ ecological adaptation strategy changes with elevation. At high elevation the metabolic rate of thick leaf spruce decreases, thus showing the effect of the climate.  相似文献