0.05),而對斥水性消失時對應(yīng)的土壤含水率(θc)影響顯著(P<0.05)。Lorentzian模型對鹽堿化農(nóng)田土壤的斥水特征曲線的擬合效果更優(yōu),,通過該曲線可準(zhǔn)確得到特定土壤的θm和θc,。本研究可為微咸水滴灌及斥水性土壤的合理利用提供理論依據(jù),。"/>

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微咸水膜下滴灌對鹽堿化農(nóng)田土壤斥水特征的影響
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美麗中國生態(tài)文明建設(shè)工程專項(XDA23060302)和國家自然科學(xué)基金項目(41630861)


Effect of Mulched Drip Irrigation with Brackish Saline Water on Soil Water Repellency Characteristics of Saline-Alkali Field
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    在內(nèi)蒙古河套灌區(qū)布置了2年大田試驗,,研究了不同覆膜方式下微咸水滴灌對鹽堿化農(nóng)田土壤水,、鹽分布及其土壤斥水性的影響,。采用滴水穿透時間(Water drop penetration time, WDPT)法測定土壤斥水性,,得到了不同土壤斥水性隨含水率變化的規(guī)律。結(jié)果表明,,膜下滴灌鹽堿化農(nóng)田土壤的斥水性在表層土壤與電導(dǎo)率呈正相關(guān),,與土壤pH值無顯著相關(guān)性,。弱堿性微咸水滴灌條件下,單次滴灌降低了滴頭附近土壤的WDPT,,但增加了遠(yuǎn)離滴頭土體的WDPT,;高頻滴灌(灌溉頻率為3d)可顯著降低土壤剖面整體的WDPT。膜下滴灌鹽堿化農(nóng)田土壤的斥水特征曲線均可用Gaussian和Lorentzian模型進(jìn)行描述,。滴灌對土壤斥水性最大時對應(yīng)的土壤含水率(θm)影響不大(P>0.05),,而對斥水性消失時對應(yīng)的土壤含水率(θc)影響顯著(P<0.05)。Lorentzian模型對鹽堿化農(nóng)田土壤的斥水特征曲線的擬合效果更優(yōu),,通過該曲線可準(zhǔn)確得到特定土壤的θm和θc,。本研究可為微咸水滴灌及斥水性土壤的合理利用提供理論依據(jù)。

    Abstract:

    A two-year field experiment was conducted to investigate soil electric conductivity (EC1∶5), soil pH value, and soil water repellency (SWR) in response to mulching method (M1: fully mulched, M2: partially mulched) and dripped irrigation frequency with brackish saline water in the Hetao Irrigation District under arid growing conditions. SWR was assessed by using the water drop penetration time (WDPT) method, and soilwater repellency characteristic curves (SWRCC) were built. Results demonstrated that SWR and EC1∶5 showed a significant positive correlation in mulched drip irrigated saline-alkali field;while it was not so obvious between SWR and soil pH value. Under the experiment condition with weak alkaline and brackish irrigation water, WDPTs of the soil near drip emitters were decreased on the 7th day after each drip irrigation at low irrigation frequency;whereas, WDPTs of the soil away from drip emitters were increased on the 7th day after a single irrigation. WDPTs were overall decreased after high frequency irrigation (once every three days). SWRCC in mulched drip irrigated saline-alkali soil can be well fitted by Gaussian and Lorentzian equations. The SWRCC curves showed that drip irrigation showed no effect (P<0.05) on θm (the volumetric soil moisture when WDPT was maximum), whereas significantly changed θc (the volumetric soil moisture when WDPT was less than 5s).Lorentzian equations showed better performance for SWRCC regression than Gaussian equations, and θm and θc can be obtained from Lorentzian curve. The research result can provide assistance for utilization of drip irrigation with brackish saline water and water repellent soil.

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周立峰,楊榮,馮浩.微咸水膜下滴灌對鹽堿化農(nóng)田土壤斥水特征的影響[J].農(nóng)業(yè)機(jī)械學(xué)報,2019,50(7):322-332. ZHOU Lifeng, YANG Rong, FENG Hao. Effect of Mulched Drip Irrigation with Brackish Saline Water on Soil Water Repellency Characteristics of Saline-Alkali Field[J]. Transactions of the Chinese Society for Agricultural Machinery,2019,50(7):322-332.

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  • 收稿日期:2018-12-05
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  • 在線發(fā)布日期: 2019-07-10
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