Recently, "Global Change and Terrestrial Ecosystem (GCTE)" and "Land-Use and Land-Cover Change (LUCC)" have become the core project and the important direction of the global change research.. The land cover is closely related to the climate and they mutually affect each other. The paper created Zhejiang land cover change map based on MODIS Enhanced Vegetation Index (EVI) products and climate change maps. A study of the relationship between the land cover change and the climate change was conducted on the maps. The conclusion was the land cover change has the relation with the local temperature change in the certain degree, does not have the relation with the precipitation change and the humidity change.
Accurate crop growth monitoring and yield forecasting are significant to food security and sustainable development of
agriculture. However, regional crop growth simulation faces the difficulties in determining the spatial distribution of
some model parameters and initial conditions. In this study, regional biomasses at turn-green stage of winter wheat were
re-estimated by linking WOFOST model and Soil Adjusted Vegetation Index (SAVI) synthesized from remote sensing
data. Moreover, we proposed a way of combining evapotranspiration derived from satellite remote sensing data to crop
grow simulation model. Thus, the regional initial available soil water and irrigation at earring stage were re-initialized
and re-estimated by using remote sensing data. Those methods were well applied to simulate the growth and
development for winter wheat at local site. After regionalizing of weather data, crop model parameters and initial
conditions, those methods were used to estimate winter wheat yields in North China during the growing season from
2001 to 2002 at the scale of 0.25 degrees. The results showed that both soil water and final winter wheat yields
estimation were improved and the relative root mean square error (RRMSE) decreased from 0.63 without remote sensing
data to 0.20 with remote sensing data for 32 sites. The relative errors of the aggregated yields for three provinces were
-4.9%, 4.3% and 8.6%, respectively. These results illustrated that remote sensing data can be used to improve winter
wheat yields simulation at regional scale.
Hydrogenated nanocrystalline silicon thin films have been deposited by helicon wave plasma chemical vapor deposition technique over the range of magnetic field strength (0-200Guass) using a mixture of silane and hydrogen gas. The effects of magnetic field on the structural and optical properties of the deposited films are characterized by Raman spectroscopy, x-ray diffraction and ultraviolet-visible transmittance spectroscopy. It has been found that the crystalline fraction and optical band gap Eg of the films change with magnetic field strength monotonically, while the deposition rate, the grain size and the B factor relating to the overall structural disorder reach a maximal value at 150 Guass. The variation of Raman scattering intensity ratio between silicon TA and TO mode indicates that the inner microstructure of the films becomes more orderly with increasing magnetic field strength until 150 Guass. The decrease trend of the optical band gap Eg and the changes of the B value with magnetic field strength from the ultraviolet-visible transmittance spectroscopy analysis are related to the increase of the grain size, the crystalline fraction and the hydrogen. The observed results have been discussed by the increase of hydrogen weak bond etching and dangling bond passivating effect with increasing magnetic field strength.
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