关键词: 生态化学计量学, 生态化学计量学, 陆生生态系统, 水域生态系统, C:N:P比

Abstract: Analysis of wheat planting area distribution pattern in a regional scale is the major basis for crop planting structure adjustment. Based on the statistical data of wheat planting area of 31 provinces (municipalities, and autonomous regions) of eight years, the paper systematically analyzed the wheat planting area spatial distribution pattern and dynamical change features, as well as the relation between production output and planting area spatial distribution pattern. The slope of trend line of wheat planting area change of eight years is -0.37, showing a downtrend in general. The wheat planting areas are divided into three areas: central and eastern major wheat concentration planting area, northern secondary wheat planting area and southern secondary wheat planting area, with the average proportion of the planting area of eight years was 70.09%, 13.47% (excluding Heilongjiang) and 12.61% respectively, showing an increase, decrease, and decrease trend respectively, with the variable coefficient of 0.06, 0.22 and 0.25 respectively. The above study indicates that, the wheat planting area of central and eastern area had higher stability, and showed a notable regional concentration, while the decrease of planting area of northern area was the primary cause of decrease of the wheat planting area of the whole country. Correlation between per unit yield and the proportion of planting area was significant in the level of 99%, and the advantage of per unit yield was also the important reason for planting area concentration. The stability of wheat planting area in central and eastern area ensured the stability of the wheat planting area of the country. Although the proportion of wheat planting area in northern and southern areas was relatively low, but restraining the decreasing trend of planting area of these areas and improving the planting area of these areas will be conductive to the stability of the wheat planting area of the country.