Supported by the National Natural Science Fund Item (40675071)~~
The key zones of returning farmland to forestland and grassland in Ningxia were studied. By using the "stepwise revised method",the climate productive potential,light and temperature productive potential in the zone...
Supported by National Natural Science Foundation of China(40675071)~~
[Objective]The aim was to research influence of climate conditions on potato yield and establish the forecasting model of potato yield.[Method]SPSS(Statistical Package for the Social Sciences) was used to separate p...
Supported by the National Natural Science Foundation of China(No.40675071)~~
In order to assess the climatical and ecological effect which returned the farmland to pasture or forest, the vegetation and crop in Northwest China with suitable threshold value were classified in this experiment by ...