Since reform and open to the outside world, foxtail millet planting area in Hebei Province has constantly reduced, and its planting region has changed from the whole province into some regions, with obvious changes. In this paper, by using qualitative and quantitative approaches like chart...

Using meteorological data and mathematical statistics analysis, we take Jungar Banner in the northern farming-pastoral region of China for example, to analyze the fluctuations in the precipitation and average temperature in Jungar Banner during the period 1961-2009. We calculate the NPP value of...