Depletion of CO2 concentration during daytime together with a low air current speed was observed in a naturally ventilated greenhouse. In a ventilated greenhouse, a zero CO2 concentration difference method together with an enhanced air current speed was introduced to decrease the CO2 leakage to outside and improve the CO2 use efficiency. Rates of canopy net photosynthesis and transpiration and CO2 use efficiencies were investigated in tomato experiment greenhouse and control greenhouse, respectively. The results show that when solar radiation increases from 383.5 W·m-2 to 940.1 W·m-2, the canopy net photosynthesis rate increases from 1.9 g·m-2·h-1 to 5.3 g·m-2·h-1, which is 1.3-1.6 times higher than that in the control greenhouse, and the canopy transpiration rate increases from 0.17 kg·m-2·h-1 to 0.56 kg·m-2·h-1, which is 1.2-1.4 times higher than that in the control greenhouse. The CO2 use efficiency is around 1. The above result indicates that the null CO2 balance concentration method together with enhanced air current speed should be considered as an efficient method for improving plant production in protected cultivation.
TONG Yuxin
,
CHENG Ruifeng
,
XIN Min
,
WANG Jun
,
YANG Qichang
. Zero CO2 Concentration Difference and Enhanced Air Current Speed Method for Tomato Plant Greenhouse[J]. Science & Technology Review, 2014
, 32(10)
: 53
-56
.
DOI: 10.3981/j.issn.1000-7857.2014.10.009
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