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茶樹噴灌防霜中植株儲水/冰量動態(tài)變化與影響因素研究
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中國博士后基金面上項目(2022M711396),、江蘇省高等學校自然科學研究面上項目(21KJB210019)、江蘇省研究生科研創(chuàng)新訓練項目(KYCX22_3683)和江蘇高校優(yōu)勢學科建設(shè)工程項目(PAPD-2018-87)


Variation and Influencing Factors of Water/Ice Storage within Tea Plant during Frost Protection Sprinkling
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    摘要:

    噴灌是園藝作物有效的防霜技術(shù)之一,。為確定茶樹噴灌防霜需水量和節(jié)約水資源,,需研究噴灌過程中植株的儲水/冰量動態(tài)變化及影響因素。本文設(shè)計了一種防滴落,、莖桿水收集及稱量組合裝置,,可直接精確獲取整株茶樹的儲水/冰量;試驗分析非凍結(jié)和凍結(jié),、微量和搖臂2類噴頭條件下儲水/冰量變化的異同,;最后探究了凍結(jié)下微量噴頭噴灌時長對儲冰量和莖桿水量的影響。研究結(jié)果表明,,非凍結(jié)條件下,,茶樹儲水量變化經(jīng)歷積累、動平衡和干燥3個階段,;凍結(jié)條件下的儲冰量隨噴灌進行持續(xù)增加,,并在停噴后較長時間內(nèi)保持不變,即積累和保持階段,,隨后依次經(jīng)歷融化流失和干燥階段,;相同噴灌壓力和時長下,微量噴頭的儲水量和儲冰量分別是搖臂噴頭的1.2倍和2.0倍,;微量噴頭噴灌時長對最大儲水量無明顯影響,,約為0.22kg,最大儲冰量則隨噴灌時長的增加而顯著增加,1.5h的儲冰量是0.5h的2.9倍,。微量噴頭作用的莖桿水量,,在非凍結(jié)和凍結(jié)條件下也較高,分別是搖臂噴頭的3.0倍和2.7倍,。本文研究了茶樹植株表面儲水/冰量變化及影響因素,,改進了灌木類植物冠層截留量的測量方法,為提升防霜效果和實現(xiàn)精準噴灌奠定了基礎(chǔ),。

    Abstract:

    Frost damage often occurs in early spring night, causing huge economic losses to the famous tea industry. Sprinkler irrigation is an effective method of frost protection, which works by maintaining leaf and bud temperatures above the critical temperature through spraying water onto the tea plant and releasing latent heat as it freezes. This method has lower economic input and labor intensity compared with other methods, and sprinkler systems can also be used for irrigation, and fertilization. However, research is still lacking on the storage of water and ice on the surface of tea trees during irrigation to prevent freezing. A tea tree was planted in pot and placed on a high-precision electronic scale to enable weighing of water mass on tea plant surface during sprinkler irrigation. An umbrella cloth was used to keep out sprinkler water from falling into the pot or onto the electronic scale. The patterns of water and ice storage on the tea tree surface under non-freezing (4.0~8.0℃) and freezing conditions (-5.0~0℃) were explored and the effects of sprinkler irrigation duration and nozzle type were analyzed. The results showed that the water storage in tea plants under non-freezing conditions went through three stages of accumulation, dynamic equilibrium and drying respectively;while ice storage under freezing conditions went through four stages of accumulation, retention, melting loss and drying. The tea tree surface was constantly renewed through icing, allowing the sprinkler water to be retained. Under the same irrigation pressure and duration, the water storage and ice storage capacity of micro-sprinkler were 1.2 times and 2.0 times of that of impact sprinkler, respectively. The maximum water storage capacity was about 0.22kg, but the maximum ice storage was increased significantly with the increase of irrigation duration. The ice storage of sprinkling 1.5h was 2.9 times of that of 0.5h. The stem water volume of the micro-sprinkler was higher under non-freezing and freezing conditions, which was 3.0 times and 2.7 times that of the impact sprinkler, respectively. The water and ice storage on the tea tree surface under different conditions was investigated, a method for measurement of shrub canopy interception was proposed, which laid the foundation for further determining the water required for sprinkler irrigation to prevent frost and optimizing the sprinkler irrigation method.

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潘慶民,鹿永宗,張志,金礦,宋佳偉,胡永光.茶樹噴灌防霜中植株儲水/冰量動態(tài)變化與影響因素研究[J].農(nóng)業(yè)機械學報,2024,55(2):180-187. PAN Qingmin, LU Yongzong, ZHANG Zhi, JIN Kuang, SONG Jiawei, HU Yongguang. Variation and Influencing Factors of Water/Ice Storage within Tea Plant during Frost Protection Sprinkling[J]. Transactions of the Chinese Society for Agricultural Machinery,2024,55(2):180-187.

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  • 收稿日期:2023-07-05
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  • 在線發(fā)布日期: 2024-02-10
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