设施土壤水分扩散率变化特征

doi:10.3969/j.issn.1674-8530.2013.01.018

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Abstract In order to clarify the change of soil water diffusivity and achieve better management of greenhouse soil and fertilizer as well as combat the secondary salinization of the soil, the variation characteristics of soil water diffusivity in 0<h≤60 cm depth greenhouse soil were studied by using the horizontal soil column method. The results showed that the soil water diffusivity varies from 0.02 to 378 cm2/min in that soil. The soil water diffusivity depends on the depth of soil. For example, the highest soil water diffusivity occurs in 20 cm<h≤40 cm soil layer, while the lowest in 40 cm<h≤60 cm layer. Meanwhile, the soil water diffusivity in every layer in the greenhouse soil is higher than in the open field soil. The relationship between soil water diffusivity and soil water content in every soil layer was an exponential function, and the correlation factor is in significance level (P<0.01). The relationship between Boltzmann parameters and soil volumetric water content in every soil layer presents a quadratic function. In 0<h≤20 cm soil layer, when the volumetric water content is greater than 043 cm3/cm3, Boltzmann parameters of the greenhouse soil are less than the open field soil; however, when the volumetric water content was lower than 0.43 cm3/cm3, Boltzmann parameters of the greenhouse soil are greater than the open field soil. In 20 cm<h≤60 cm soil layer, Boltzmann parameters of the greenhouse soil are all greater than the open field soil.

Key words： greenhouse soil;open field soil;soil water diffusivity;soil water movement Boltzmann parameters

Received: 25 May 2012 Published: 31 January 2013

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	ZHENG Zi-Cheng
	LI Ting-Xuan
	LI Wei

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ZHENG Zi-Cheng,LI Ting-Xuan,LI Wei. Variation characteristics of soil water diffusivity in greenhouse soil[J]. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(1): 87-92.

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http://zzs.ujs.edu.cn/pgjx/EN/10.3969/j.issn.1674-8530.2013.01.018 OR http://zzs.ujs.edu.cn/pgjx/EN/Y2013/V31/I1/87

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