滴灌模式和NaCl处理对苹果幼树水流阻力与水分利用的影响

为了探讨滴灌模式和NaCl处理对苹果幼树水流阻力与水分利用的影响,该文采用了3种滴灌模式(交替滴灌ADI、固定滴灌FDI和常规滴灌CDI)和4个NaCl浓度梯度(0(CK)、0.2%(S1)、0.3%(S2)、0.4%(S3))。结果表明:叶水流阻力(Rl+p)与叶水分利用效率(WUEl)、总水流阻力(Rt)与灌溉水利用效率(WUEi)间均呈对数相关关系。在相同的盐分处理下,与CDI处理相比,ADI处理节水达50%,平均根系干物质质量和根水流阻力(Rr)仅分别下降了8.7%和0.53%,而WUEl、WUEi、Rl+p、冠层水流阻力和Rt分别提高了7.6%、16.96%、74.85%、35.33...

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Published in农业工程学报 Vol. 28; no. 4; pp. 117 - 123
Main Author 杨启良 张富仓 刘小刚 戈振扬
Format Journal Article
LanguageChinese
Published 昆明理工大学现代农业工程学院,昆明650500 2012
西北农林科技大学旱区农业水土工程教育部重点实验室,杨凌712100%西北农林科技大学旱区农业水土工程教育部重点实验室,杨凌,712100%昆明理工大学现代农业工程学院,昆明,650500
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ISSN1002-6819
DOI10.3969/j.issn.1002-6819.2012.04.019

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Summary:为了探讨滴灌模式和NaCl处理对苹果幼树水流阻力与水分利用的影响,该文采用了3种滴灌模式(交替滴灌ADI、固定滴灌FDI和常规滴灌CDI)和4个NaCl浓度梯度(0(CK)、0.2%(S1)、0.3%(S2)、0.4%(S3))。结果表明:叶水流阻力(Rl+p)与叶水分利用效率(WUEl)、总水流阻力(Rt)与灌溉水利用效率(WUEi)间均呈对数相关关系。在相同的盐分处理下,与CDI处理相比,ADI处理节水达50%,平均根系干物质质量和根水流阻力(Rr)仅分别下降了8.7%和0.53%,而WUEl、WUEi、Rl+p、冠层水流阻力和Rt分别提高了7.6%、16.96%、74.85%、35.33%和15.22%;在高盐分S2和S3处理下,ADI处理的Rl+p和WUEi分别提高了50.5%和78.07%、14.99%和23.65%,但ADI处理的Rr反而降低了1.34%和9.96%。可见,采用ADI处理进行灌溉具有促进根系生长和提高Rl+p及降低Rr的作用,是引起水分利用效率提高的重要原因,不仅提高了调控植物体内水分平衡的能力,而且也增强了抗盐分胁迫能力。
Bibliography:11-2047/S
irrigation; greenhouse; moisture; drip irrigation mode; NaCl concentration; young apple tree; hydraulic resistance
This research investigated the effect of four NaCl levels (0% (CK), 0.2% (S1), 0.3% (S2) and 0.4% (S3)) and three drip irrigation modes[alternate partial rootzone drip irrigation(ADI: alternate watering on both sides of the root-zone), fixed partial rootzone watering (FDI: fixed watering on one side of the root-zone ) and conventional watering(CDI: Simultaneous watering on both sides of the root-zone)] on the physiological characteristic, hydraulic resistance and water use of young apple tree (Malus pumila) under greenhouse condition. The results show that the relationship between leaves hydraulic resistance (Rl+p) and leaf water use efficiency (WUEl), the total hydraulic resistance (Rt) and irrigation water use efficiency (WUEi) were described as a logarithmic correlation. Compared with the CDI, water-saving up to 50 percent for ADI, but the average root dry matter and root hydraulic res
ISSN:1002-6819
DOI:10.3969/j.issn.1002-6819.2012.04.019