涂白对塑料大棚小气候及青菜生长的影响

Effects of white paint on microclimate of plastic greenhouse and growth of pakchoi

为探讨夏季高温期间涂白大棚对小气候及青菜生长的影响,于2010-2011年在上海市嘉定区开展了大棚青菜栽培试验。结果表明:涂白大棚光温环境更有利于青菜生长,涂白大棚和黑色遮阳网大棚内平均气温分别为30℃和29℃左右,透光率分别为52%和39%以下,辐射强度分别在2 000μmol·m^(-2)·s^(-1)和1 260μmol·m^(-2)·s^(-1)以下;涂白大棚内青菜品种‘金夏莳'、‘华尔兹'和‘夏帝'分别比黑色遮阳网大棚增产20.8%,31.9%和26.0%,3个品种的株高、叶龄、最大叶长和叶宽显著优于黑色遮阳网大棚内生长的相应品种。

In order to study the effects of daubing plastic greenhouse with white paint on the mi- croclimate and pakchoi growth during high temperature summer,cultural experiments with 3 pakchoi varieties were carried out under plastic greenhouses in Jiading District from 2010 to 2011. The results showed that daubing plastic greenhouse with white paint made light and temperature more propitious for pakchoi growth. Both white paint greenhouse and black sun-shading net g^eenhouse were respec- tively about 30 C and 29 C in average indoor temperature,respectively under 52% and under 39% in transmittance and respectively less than 2 000 μmol m-2 . s-1 and less than 1 260 μmol m-2 s-1 in radia- tion intensity. The yields of pakchoi varieties ＇Jinxiashi＇, ＇Huaerzi＇ and ＇Xiadi＇ in the white paint greenhouse were respectively 20.8% ,31.9% and 26.0% higher than those in the black sun-shading net greenhouse. And the 3 varieties＇ plant height,leaf age and maximal leaf length and width in the white paint greenhouse were also significantly better than those in black sun-shading net greenhouse.