Dynamical Changes of Hydraulic Resistance and Capacitance in the Soil-alfalfa System at Different Growth Stages

doi:10.11733/j.issn.1007-0435.2009.05.007

›› 2009, Vol. 17 ›› Issue (5): 575-580.DOI: 10.11733/j.issn.1007-0435.2009.05.007

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Dynamical Changes of Hydraulic Resistance and Capacitance in the Soil-alfalfa System at Different Growth Stages

FU Wei^1,2, HUANG Ming-bin¹, SHAO Ming-an¹

1. The State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, CAS&MWR, Northwest A&F University, Yangling, Shaanxi Province 712100, China;
2. Graduate School, Chinese Academy of Sciences, Beijing 100049, China

Received:2009-04-17 Revised:2009-07-16 Online:2009-10-15 Published:2009-10-15

不同生育期土壤-苜蓿系统水流阻力和水容变化规律研究

付微^1,2, 黄明斌¹, 邵明安¹

1. 中国科学院水利部水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 西北农林科技大学, 陕西, 杨凌, 712100;
2. 中国科学院研究生院, 北京, 100049

通讯作者: 黄明斌,E-mail:hmbd@nwsuaf.edu.cn
作者简介:付微(1979- ),女,辽宁盘锦人,博士研究生,研究方向为土壤物理和生态水文,E-mail:annefwd@sina.com.cn
基金资助:
国家“973计划”项目(2007CB407201);中国科学院、国家外国专家局创新团队国际合作伙伴计划-流域水土过程模拟

Abstract

Abstract: Alfalfa(Medicago Sativa L.) is one of the dominant sown forages with the characteristics of strong tolerance to cold and drought in the interleaving region of wind and water erosions of the Loess Plateau.A simulating experiment of alfalfa planted in soil columns with different water treatments was conducted under the natural conditions at Shenmu Experimental Station,Shaanxi province and the dynamical changes of hydraulic resistance and capacity in the soil-alfalfa system was quantitatively calculated using transient water flow model of the transpiration-preventing method.The results show that hydraulic resistance and capacitance varied with growing seasons.The mean hydraulic resistance at flowering stage was minimum at 0.22×10⁸ Mpa.s.m^-3,which was about 1/9 lower than that at senescent stage,and the mean hydraulic capacitance was maximum at 5.38×10^-4 m³/Mpa,which was four times higher than that at squaring stage.The results could help further understand the mechanism of water regulation and drought resistance of alfalfa and be useful for revegetation practice in the arid and semi-arid areas.

Key words: Wind-water erosion interleaving region, Medicago sativa L., Hydraulic resistance, Hydraulic capacitance

摘要： 紫花苜蓿是水蚀风蚀交错带重要的人工种植牧草,具有较强的耐寒、耐旱性。自然条件下的模拟土柱试验在陕北神木试验站进行,采用抑制蒸腾法定量分析了水蚀风蚀交错带土壤-苜蓿系统水流阻力、水容等瞬态水流参数变化过程。结果表明:不同生育期内瞬态水流阻力及水容有明显差异:开花旺盛期平均水流阻力最小0.22×10⁸Mpa.s.m^-3,约为干枯老化期的1/9;平均水容最大5.38×10^-4m³/Mpa;是现蕾期的4倍多。该研究结果有助于揭示紫花苜蓿体内水分调节作用及抗旱机制,对干旱半干旱地区植被恢复有重要指导意义。

关键词: 水蚀风蚀交错带, 苜蓿, 水流阻力, 水容

CLC Number:

Q948.118

FU Wei, HUANG Ming-bin, SHAO Ming-an. Dynamical Changes of Hydraulic Resistance and Capacitance in the Soil-alfalfa System at Different Growth Stages[J]. , 2009, 17(5): 575-580.

付微, 黄明斌, 邵明安. 不同生育期土壤-苜蓿系统水流阻力和水容变化规律研究[J]. , 2009, 17(5): 575-580.

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Dynamical Changes of Hydraulic Resistance and Capacitance in the Soil-alfalfa System at Different Growth Stages

不同生育期土壤-苜蓿系统水流阻力和水容变化规律研究

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