Evaluations On The Productive Potential Of Maize Based On DEM In Mountainous

Focusing Grain resources sustainable development using in the mountainous area, the thesis establishes spatial-temporal distribution model of the eco-environmental factors (including sunshine hours, radiation, temperature, precipitation as well as crop reference evapotranspiration) in complex terrain of mountainous area with the meteorological data, basing on the DEM data, Using the GIS and software of ANUSPLIN and DSP. Proceeding from this, the FAO-AEZ approach is adopted to estimate the potential productivity of maize, which is one of the important crops in Western Henan mountainous. This paper analyzes the potential productivity resources of maize with the simulation of ecological factors in study area, and evaluates the potential productivity resources utilization efficiency at country cell level, comparing the actual production data. At the same time, the paper calculates and analyzes the utilization efficiency of ecological factors at various levels. The results as follows:1) The difference of the potential productivity of maize at various levels in the Western Henan mountainous is significant. But, the spatial distribution regular is more manifest, and the overall value is high. The results show that in general the potential productivity of photosynthetic and photo-temperature tends to be higher from center to surroundings, and the average potential productivity of photosynthetic and photo-temperature is 56.5t/hm2 and 10.8t/hm2. But the potential productivity of climate and the potential productivity of nature tend to be higher in South than in North in general, the average value of which is 9.05t/ hm2 and 6.39t/ hm2.2) It shows that the spatial distribution also has some regularity to analyzing the potential productivity resources utilization efficiency at various levels. The utilization efficiency of photosynthetic and utilization efficiency of phtoto-temperature display that the value tends to increasing from West to East, and the average value is 6.13%, 31.72%. But the utilization efficiency of climate and utilization efficiency of nature are increasing from South to North, and the average value is 39.03%, 56.11%. The results shows that the present maize productivity has more than 16 double, 3 double, 2.5 double and 2/5 increasing space according to the potential photosynthetic, photo-temperature ,climate and nature productivity.3) To calculate and analyze the utilization efficiency of light, the productive efficiency of heat, the productive efficiency of Precipitation, the productive efficiency of land, we could find that there is a relationship between the utilization efficiency of eco-environmental factors and the potential productivity, the potential productivity resources utilization efficiency.4) The South region and Northwest region in Western of Henan province have the lower utilization efficiency of reality resources, which also have more space to improve the productivity; but the Mideast has higher potential productivity and reality resources utilization efficiency and lower development degree. In short period, to improving the maize productivity in Western of Henan, it is a better and quick methods to enhance the potential productivity resources utilization efficiency in Mideast, including extending growth period, controlling field capacity, improving soil and cultivating new varieties. In the long term strategy, it is the best methods to large developing the potential productivity in South and Northwest, by timely planting and harvesting, timely draining and drought resistance, scientific fertilization, improving species and so on.