A Research Of Nonuniformity Environment In The Solar Greenhouse And The Influence On Pepper Growth

Solar radiation is the main heat resource of solar greenhouse, so uneven distribution ofsolar radiation intensity in the solar greenhouse is one of the main reasons for non-uniform ofenvironment elements. In this paper, the distribution of sunlight inside the solar greenhousewas simulated by constructing the solar greenhouse total solar radiation calculation model.Onthis basis, the non-uniform distribution and internal relevant of environmental factors in thesolar greenhouse was monitored and analyzed.And then analyze the influence on peppergrowth which caused by the non-uniform distribution of environmental factors. Specificcontent as follows:This study used the Berlage formulate to calculate the solar greenhouse total radiationintensity of illumination based on the former solar greenhouse daylighting calculation model,The scattered radiation and reflection sunlight of surfaces inside solar greenhouse wascalculated by using the physical principle of “rate of sky”.The computer model thatcalculating total radiant energy of arbitrary point on the surface was programmed by Javasoftware. Through the verification, the simulation data of solar radiation intensity illuminationwhich was calculated by using the model coincided with the actual measured data very well,and the model can be more accurate to simulate the solar radiation intensity of illuminationchange and the actual situation of greenhouse.In order to study the inhomogeneity of thermal environment inside the solar greenhouse,we monitored and theoretically analyzed temperature, sunlight and heat flux density on thesurface of ground and back wall of solar greenhouse. The results showed that environmentalfactors (temperature and sunlight) on the ground surface and back wall surface in solargreenhouse had certain differences. Uncovered the heat preservation curtain, non-uniformtemperature distribution on land surface and back wall surface was mainly caused bynon-uniform solar radiation energy distribution and the difference of the heat transferperformance. The land surface temperature of central was greater than that of forepart and lessthan that of the posterior part; radiation intensity increased from south to north. Maximummean temperature difference of every measuring point on surfaces appeared at16PM, at thistime, the central measuring point had a highest value of29.2℃, but the solar radiation of thecentral meaning point was less than the rear, which with lower value of465.6W/m2.Coveredthe heat preservation curtain, radiation intensity and temperature on the back wall surfaceincreased from top to bottom. Minimum mean temperature difference of every measuringpoint on land surface and back wall surface appeared before covered the heat preservationcurtain.Investigating and analyzing the effects on the growth and physiology of pepper due tothe nonuniformity environment of solar greenhouse. The results showed that non-uniformityof environment significantly affected the pepper plant growth forms, shoot height and leafarea index increased from south to north; for the influence of the pepper plant stem diameterwas not significant. The growth and physiology of hot pepper which was effected by thenonuniformity environment of solar greenhouse was investigated and analyzed.The pepperplant reproductive growth showed that central area plants flowering number were significantly higher than that of front and rear, the front area of the plant fruit-set rate wassignificantly higher than the central region and posterior regions. For the performance of therelative contents of chlorophyll（SPAD value）, plant SPAD value in the central area wassignificantly higher than that of the front and rear.Pn and Tr increased from north to south,and Ci and Gs were highest in central, the lower front and rear.