I. THE IMPORTANCE AND URGENCY OF NATURAL CONSERVATION Mankind is seeking economic development and utilizing natural resources, which must agree, with limited resources and support of ecosystem while g
According to practical measurement and related data, the writer discusses the main features of rivers in the Sanjiang Plain and the change of water balance with time and space, and then estimates wate
The tea tree [Camellia sinensis (L) Kuntze] is one of the world’s economic crops. It is an especially important crop for southern China. Environmental factors
Cotton is the leading cash crop in China. The cotton sown area accounts for about 30per cent of the total sown area of all the various cash crops. It is the main material used in the textile industry