Sun Z.,Key Laboratory of Protected Horticulture |
Sun Z.,ShenYang Agricultural University |
Sun Z.,Key Laboratory of Protected Horticulture of Liaoning Province |
Huang W.,Lingyuan Hongyuan Protected Agricultural Service Co. |
And 11 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2013
The Chinese energy-saving solar greenhouse (CESG) is a special type of greenhouse without heating system, originated in Anshan, Liaoning province. In China, during the mid-1980s, the CESG was composed of the front house roof (for lighting), north wall, east-west gable, back roof (for heat storage and heat preservation), and outside heat preservation covering materials. The applied area of CESG in China reached 928 thousand hm2 by 2012, which has completely resolved the problem on the year-round vegetable supply, especially in winter in north China. However, the CESG also faces many problems such as uneven distribution of light and temperature in greenhouse, difficulties to achieve automatic control of outside heat preservation covering materials, poor ability of rainproof, snow-proof, wind-proof and fire-proof, and destruction of lots of arable land for greenhouse construction of earth wall and brick wall. To resolve the above problems, a new type of energy-saving solar greenhouse assembled with heat preservation color plate (CPSG) was developed in Lingyuan (latitude 41°20'N, longitude 119°31'E), Liaoning province, China from 2010 to 2012. The light and temperature performances were studied from January to March, 2013.The CPSG was the large scale arched structure with a span of 12 m, a ridge height of 5.5 m, a length of 65m, a front roof lighting angle of 41.5°, a front roof covering materials of polyolefin film. The skeleton structure was semi-circular arc, which slide to opening or closing the heat preservation covering materials of rock wool color plate outside, and to move the opening or closing of the rock wool color plate east gable (in the morning) and west gable (in the afternoon) respectively. As a result, the CPSG not only resolved the problem of rain-proof, snow-proof, wind-proof and fire-proof for Chinese traditional solar greenhouse, but also brought about the accurate operation of outside heat preservation color plate. Furthermore, this type of greenhouse adopted water-recycle heat storage-release system (WHSS) and air-underground heat exchange storage-release system (AHESS). WHSS is running 5.5h/d on sunny day and the solar energy storage capacity is 1200 kJ/m2 (greenhouse area), which made the greenhouse temperature increase 7-8°C in winter night. At the same time, solar energy accumulation for AHESS is 221 kJ/m2, which shows that two heat storage-release systems may replace the heat storage-release function of earth wall and brick wall, and then to lay the foundation for assembled construction of the CESG. Compared with the traditional Liaoshen III type solar greenhouse, CPSG increases 5.3% of the lighting quantity by enhancing 16.3° in the front roof lighting angle. When the outside nighttime air temperature was -25.8°C, the nighttime air temperature in the CPSG reaches more than 13°C with an increase of 2.3-3.5°C, the temperature difference between inside and outside reaches 39.1°C. In addition, the CPSG has larger cultivation space, better lighting quantity, more rapid warming up, and more even distribution of light and temperature in the north-south direction or the east-west direction, resulting in a unanimous plant growth. In summary, the study shows that new type of CPSG integrates the advantages of the large multi-span greenhouse and Chinese traditional solar greenhouse, heightens the efficiency of light energy utilization, reduces the labor intensity, realizes the accurate control of heat preservation covering materials, will provide a new effective way for automation and modernization of solar greenhouse in China.
Qi M.,ShenYang Agricultural University |
Qi M.,Key Laboratory of Protected Horticulture |
Qi M.,Key Laboratory of Protected Horticulture of Liaoning Province |
Liu Y.,ShenYang Agricultural University |
And 5 more authors.
Biological Trace Element Research | Year: 2013
Nano-TiO2 has been reported to promote photosynthesis in some crops; however, the mechanism behind this action remains unknown. In this research, the effects of nano-TiO2 on leaf photosynthesis under mild heat stress were investigated. Results showed that the net photosynthetic rate, conductance to H2O, and transpiration rate of tomato leaves increased after application of an appropriate concentration of nano-TiO2. Nano-TiO2 also significantly decreased the minimum chlorophyll fluorescence and relative electron transport in leaves. Under mild heat stress, Nano-TiO2 increased regulated photosystem II (PS II) energy dissipation and decreased non-regulated PS II energy dissipation. These results indicate that nano-TiO2 plays a positive role in promoting photosynthesis in tomato leaves under mild heat stress. © 2013 Springer Science+Business Media New York.
Tong X.,Key Laboratory of Protected Horticulture |
Tong X.,Key Laboratory of Protected Horticulture of Liaoning Province |
Tong X.,Key Laboratory of Protected Vegetables Engineering of Liaoning Province |
Tong X.,ShenYang Agricultural University |
And 12 more authors.
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2016
Researching on heating effects of solar energy water-cycling system in solar greenhouse in winner and summer, solar energy was regarded as support, water was used as media to store and release heat, and PC board was used as the device to store and release heat. We tested the heat storage of different color of PC board, different thickness of PC board and different flow speed of PC board respectively. And compare with heating effect and heating efficiency of solar energy water-cycling system between a fine day in winter and in summer. The experiment showed that the heat storage of 6 mm brown PC board was 191.5 kJ/(m2·d), the most. It increased by 15.2% than transparent PC board. And the heat storage of 8 mm transparent PC board was 198.2 kJ/(m2 ·d), it increased by 19.2% and 4.5% than 6 mm and 10 mm PC board respectively. Then when the water flow was 4.4-4.5 L/h, the heat storage of PC board was the most, heating effect was also the best. The heat storage of solar energy water- cycling system reached 159.8 MJ, it made the greenhouse temperature 3-5℃ higher, and the heating efficiency was 54.5% in winter. At the same time, the solar energy water-cycling system made the greenhouse temperature 5-8℃ lower, and the heating efficiency was 54.6% in summer. So the water-cycling system can not only increase the utilization of the solar energy, but also make the solar greenhouse high efficiency and energy saving, and provide the foundation for the development of prefabricated sunlight greenhouse structure. © 2016, Editorial Board of Acta Energiae Solaris Sinica. All right reserved.
Sun Z.-P.,Key Laboratory of Protected Horticulture |
Sun Z.-P.,ShenYang Agricultural University |
Li T.-L.,Key Laboratory of Protected Horticulture |
Li T.-L.,ShenYang Agricultural University |
And 2 more authors.
Biologia Plantarum | Year: 2011
The root system of potato (Solanum tuberosum L. cv. Favorita) plants was treated with different O 2 and CO 2 concentrations for 35 d in aeroponic culture. Under 21 or 5 % O 2 in the root zones, the thickness of leaves and palisade parenchyma significantly increased at 3 600 μmol(CO 2) mol -1 in the root zone, compared with CO 2 concentration 380 μmol mol -1 or low CO 2 concentration (100 μmol mol -1). In addition, smaller cells of palisade tissue, more intercellular air spaces and partially two layers of palisade cells were observed in the leaves with root-zone CO 2 enrichment. Furthermore, there was a significant increase in the size of chloroplasts and starch grains, and the number of starch grains per chloroplast due to elevated CO 2 only under 21 % O 2. In addition, a significant decline in the thickness of grana and the number of lamellas, but no significant differences in the number of grana per chloroplast were observed under elevated CO 2 concentration. The accumulation of starch grains in the chloroplast under elevated CO 2 concentration could change the arrangement of grana thylakoids and consequently inhibited the absorption of sun radiation and photosynthesis of potato plants. © 2011 Springer Science+Business Media B.V.
Qi M.-F.,Key Laboratory of Protected Horticulture |
Qi M.-F.,ShenYang Agricultural University |
Xu T.,Key Laboratory of Protected Horticulture |
Xu T.,ShenYang Agricultural University |
And 4 more authors.
The Scientific World Journal | Year: 2014
Polygalacturonase (PG) is crucial in plant organ abscission process. This paper investigated the cellular and subcellular localization of PG in ethylene-stimulated abscission of tomato pedicel explants. Confocal laser scanning microscopy of abscission zone sections with the fluorescent probe Cy3 revealed that PG was initially accumulated in parenchyma cells in cortical and vascular tissues after 8 h of ethylene treatment and then extended throughout the abscission zone when the abscission zone separated at 24 h after ethylene treatment. At the subcellular level, transmission electron microscopy with immunogold staining showed that PG showed abundant accumulation in the cortical and vascular tissues at 8 h after ethylene treatment, and the distribution area extended to the central parenchyma cells at 16 h after ethylene treatment. In addition, PGs were observed in the distal and proximal parts of the tomato pedicel explants throughout the abscission process. The results provided a visualized distribution of PG in the pedicel abscission zone and proved that PG was closely related to abscission. © 2014 Ming-Fang Qi et al.
Tian S.,Key Laboratory of Protected Horticulture |
Tian S.,ShenYang Agricultural University |
Li T.,Key Laboratory of Protected Horticulture
Proceedings - 4th International Congress on Image and Signal Processing, CISP 2011 | Year: 2011
Vegetable grafting is one of the most effective means to resist soil-born diseases and to improve yield. Manual grafting has the problems of low production and poor grafting quality, so grafting robot is significant for the development of vegetable grafting production. However, the automation level is still relatively low. So the introduction of computer vision technique into grafting robot has great significance in promoting the intelligent control level in greenhouse. In this paper, development and current status of domestic and foreign automatic grafting machine was introduced simply, and review of recent application of computer vision in seedling automatic grafting robot was summarized in detail. © 2011 IEEE.