Root structure,distribution and biomass in five multipurpose tree species of Western Himalayas   总被引：1，自引：0，他引：1  

Kartar Singh VERMA  Sandeep KOHLI  Rajesh KAUSHAL  Om Parkash CHATURVEDI 《山地科学学报》2014,11(2):519-525

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The tree root distribution pattern and biomass of seventeen year old trees of Grewia optiva, Morus alba, Celtis australis, Bauhinia variegata and Robinia pseudoacacia were studied by excavation method. B. variegata roots penetrated to a maximum depth of 4.78 m, whereas, M. alba roots were found down to 1.48 m depth. Lateral spread was minimum in B. variegata （1.10 m）and maximum inR. pseudoacacia （7.33 m）. Maximum root biomass of 6.30 kg was found in R. pseudoacacia and minimum （2.43 kg） was found in M. alba. For four species viz.,G. optiva, M. alba, C. australis andR. pseudoacacia, 68%-87% root biomass occurred within top 0-30 cm soil depth, but forB. variegata this was only45%. The soil binding factor was maximum in G. optiva and minimum in B. variegata. Soil physico-chemical properties also showed wide variation. The study suggests thatB. variegata with a deep root system is the most suitable species for plantation under agroforestry systems. R. pseudoacacia and G. optiva with deep root systems, more lateral spread and high soil binding factor are suitable for plantation on degraded lands for soil conservation.  相似文献   

Unified approach to weak turbulence     

K. L. Vithal  R. P. Vats 《Astrophysics and Space Science》1983,91(2):245-272

A unifield formulation of weak homogeneous turbulence has been developed by introducing Bogoliubov's expansion method, known from the dynamical theory in statistical mechanics. It enables to close the hierarchy of the associated wave-correlation functions as well as to derive dynamical equations which statistically describe the nonlinear interaction of the different modes. The latter modes may have complex frequencies, connected with the linearized problem, corresponding to either stable or unstable modes, although the non-linearity has to be weak. For this model, some general properties such as energy conservation as well as special cases — e.g., resonant three-wave interaction, etc. — are discussed.  相似文献   

MHD turbulence via extended Burgers' equation     

K. L. Vithal  R. P. Vats 《Astrophysics and Space Science》1983,91(2):273-284

An extension of the Burgers' equation, which relates a random velocity field and random magnetic field, is treated statistically to study the energy transfer in the nonlinear interactions.  相似文献   

A treatment of three dimensional incompressible turbulence     

K. L. Vithal  R. P. Vats 《Astrophysics and Space Science》1983,89(1):229-232

Cascade process is found to occur in the three-dimensional incompressible turbulence.  相似文献   

Correlation of Heat Flow and Crustal Topography in the Indian Region     

Janardan G. Negi  Om Prakash Pandey 《Geophysical Journal International》1976,45(2):201-217

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A comparative analysis of pansharpening techniques on QuickBird and WorldView-3 images     

Snehmani  Ashwagosh Ganju  Satish Kumar  P. K. Srivastava  Hari Ram R P 《国际地球制图》2017,32(11):1268-1284

Nowadays, different image pansharpening methods are available, which combine the strengths of different satellite images that have different spectral and spatial resolutions. These different image fusion methods, however, add spectral and spatial distortions to the resultant images depending on the required context. Therefore, a careful selection of the fusion method is required. Simultaneously, it is also essential that the fusion technique should be efficient to cope with the large data. In this paper, we investigated how different pansharpening algorithms perform, when applied to very high-resolution WorldView-3 and QuickBird satellite images effectively and efficiently. We compared these 27 pansharpening techniques in terms of quantitative analysis, visual inspection and computational complexity, which has not previously been formally tested. In addition, 12 different image quality metrics available in literature are used for quantitative analysis purpose.  相似文献   

Integration of Sparse Geologic Information in Gold Targeting Using Logistic Regression Analysis in the Hutti–Maski Schist Belt,Raichur, Karnataka,India—A Case Study     

Sahoo  Nihar Ranjan  Pandalai  Hari Shankar 《Natural Resources Research》1999,8(3):233-250

Logistic regression has been used in the study to integrate indicator patterns for estimation of the probability of occurrence of gold deposits in a part of the auriferous Archaean Hutti–Maski schist belt. Data used consist of categorical and continuous variables obtained from a coded lineament map and geochemical anomaly maps of the pathfinder elements of gold in soil and groundwater. Main effects and interactions of the variables studied were used in formulating the logistic regression model. Regression models using lineament-proximity data, combined with soil and groundwater geochemical anomalies were tested on parts of the schist belt with data not used in estimation of model parameters. Predicted probabilities greater than 0.9 identified known deposit locations in the area.  相似文献   

Role of Vertical Resolution in Numerical Models Towards the Intensification,Structure and Track of Tropical Cyclones     

D. V. Bhaskar Rao  D. Hari Prasad  D. Srinivas  Y. Anjaneyulu 《Marine Geodesy》2013,36(4):338-355

The impact of vertical resolution on the evolution and movement of tropical cyclones was studied using NCAR MM5 model with a horizontal resolution of 9 km. Four numerical experiments were performed with different vertical resolutions, that is, with 23 vertical levels as control experiment, and 36 vertical levels with high resolution in the lower troposphere, 33 vertical levels with high resolution in the upper troposphere and 46 vertical levels with increased vertical resolution throughout the troposphere as relative to base experiment. The results indicate that increased vertical resolution in the lower troposphere produces efficient intensification and better structure in terms of eye and eyewall. Increased vertical resolution at lower levels improves the prediction of vertical shear of horizontal wind. Experiments with high resolution in the lower troposphere and high resolution throughout the troposphere simulate better track up to 72 hours.  相似文献   

Hydrochemistry and sediment characteristics of polar periglacial lacustrine environments on Fisher Island and Broknes Peninsula,East Antarctica     

Raj esh Asthana  Prakash Kumar Shrivastav  Hari Bahadur Srivastava  Mirza Javed Beg  Pradeep Kumar 《极地研究(英文版)》2013,(4):281-295

Fisher Island and Broknes Peninsula in the Larsemann Hills constitute part of a polar lowland periglacial environment between marine and glacial ecosystems. The landscape is characterized by gently rolling hills and broad valleys interspersed with lakes formed in glacially scoured basins. We analyzed the physieochemical parameters and the ionic constituents of water samples from 10 lakes in each of these two locations. Our results showed considerable differences between the two regions and demon- strated the influence of lithology and processes including weathering, evaporation, and atmospheric precipitation. All major cations and anions in the lake waters showed positive correlations indicating balanced ionic concentrations. Unconsolidated sediments were sparsely distributed and scattered over glacial deposits, valley fills, and occasional moraine ridges. The type and rate of sedi- mentation was mainly controlled by surface run-off and aeolian influx. The sediment samples from lake beds and the catchment area on Fisher Island were immature and poorly to very poorly sorted, consisting of gravelly sand with negligible silt and finer fractions. Sediments had a polymodal grain size distribution with the two major populations lying between -2 and 1 phi and be- tween 0 and 1.5 phi. The sediments were lithic arenite to arkosic in composition and the microtextures imprinted over quartz grains were dominated by mechanical textures resulting from several stages of glacial crushing and grinding. The presence of deep disso- lution cavities, cryptocrystalline precipitation, and euhedral crystal growth signified the effect of chemical activity after the deposition of grains in the lacustrine environment.  相似文献   

Attapulgite as Potential Adsorbent for Dissolved Organic Carbon From Oily Water          下载免费PDF全文

Mansour Al. Haddabi  Hari Vuthaluru  Hussein Znad  Mushtaque Ahmed 《洁净——土壤、空气、水》2015,43(11):1522-1530

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