A new kind of sunlight greenhouse--the research on the optimal distribution of the ecological factors in the artificial greenhouse ecological system

To solve the questions in the greenhouse such as the high temperature and the humidity at noon. the high rate of the plant diseases and insect pests and the high frequency of using pesticide, we invent a new kind of sunlight greenhouse with canopy structure of negative and positive. Due to the hot exchange between negative canopy and positive canopy, it can reduce the positive canopy's high temperature at noon.It can not only postpone and shorten the time in which the positive canopy's temperature is more than 30℃ at noon but also improve the low temperature at night. In comparison with the two generations of sunlight greenhouse the average temperature has improved 3\^8℃ and ground temperature has improved 4\^2 ℃. The amount of the sunlight is more than the comparison by 13\^5% The time in which the humidity is over 85% reduce 4\^7h/d, the rate of plant diseases and insect pests without agriculture chemical reduce more than 85%. The surplus quantity of heat of the positive canopy to supplement to negative canopy can make its temperature increase 3~5 degrees Centigrade. This kind of sunlight greenhouse turns the areas of the back of the single canopy sunlight greenhouse to the production areas, and the utilization rate of soil is increased from 43\^8% to 48\^8%. This sunlight greenhouse can offer two kinds of artificial greenhouse ecological system different in sunlight, temperature condition, etc. This system reached the optimal distribution of the ecological factors such as sunlight, temperature, water, carbon-dioxide and soil etc. It is effective to increase the productivity of this system. \;Combined construction of rainwater catchment with methane pool and new sunlight greenhouse supports the techniques for the sustainable of the semi-arid area agriculture.