Extraction of winter wheat planting area by object-oriented classification method;

Estimation of the rice planting area using digital elevation model and multitemporal moderate resolution imaging spectroradiometer;

Study on Extracting Winter Wheat Planting Area Based on MODIS Data by Spectral Mutation

Research on the Correlation of Plant Species-area with Shady Slope and Sunny Slope and Different Altitudes in the Arid-valley Region of the Zagunao River;

Quercus aquifoliodes forest is a type of high mountain hard leaf evergreen broad-leaved forests distributing in Hengduanshan Mountain,this paper researches correlation of the minimal areas and the numbers of species inside the minimal areas of Quercus aquifoliodes dwarf forest with altitude gradient at Wolong Nature Reserve in Sichuan Province by the use of Species-area theory.

Based on the cost-income data (1980-2002) of farm produce and the China Agricultural Yearbook, taking these main crops in the progress of the arable land use as a case study, this paper studied the regional differences in the changes of the agricultural land use in China during the period 1980-2002 from three aspects as the degree of intensity, the sown area and the abandonment of the arable land.

The results showed that the winter wheat planting area of Ke.

Based on the cost-income datum(1980～2002) of farm product and the China Agricultural Yearbook,taking these main crops in the progress of the arable land use as a study case,this paper studied the characters and its driving force for the annual changes of the degree of intensity,the sowing area and the abandonment of the arable land.