土壤密实度对单点源入渗土壤水分再分布影响研究
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摘要
滴灌点源供水条件下土壤入渗湿润体变化特征值及其影响因素的研究,是正确设计滴灌系统和对田间作物水分进行高水平管理的前提和基础。文中通过田间膜下滴灌单点源入渗试验,运用AUTOCAD和SURFER软件分析研究土壤密实度对滴灌点源入渗结束24h后湿润体特征值及水分分布规律的影响。结果表明,单点源湿润体特征值随土壤密实度的增大,水平方向距离增大的幅度要比垂向大;水平方向湿润体土壤剖面含水率与水平距离呈二次函数关系,相关系数均为0. 95以上,垂直方向湿润体土壤剖面含水率与垂直距离呈线性函数关系,相关系数均为0. 97以上;土壤密实度的大小对土壤水分再分布后的土壤含水率等值线的疏密程度产生影响,此结论将对下一步研究复杂的双点源交汇入渗以及滴灌点源入渗参数预测模型有理论指导意义。
under the water supply condition of the point source of drip irrigation,the research ahout the characteristic value changes and its influencing factors of soil infiltration of wetting body is the premise and foundation of high level of correct design of drip irrigation system and field moisture management for the crops. Single point source soil infiltration test was conducted under membrane drip irrigation in the field; by using AUTOCAD and SURFER software,the change rule and moisture distribution about characteristic value of wetting body under membrane drip irrigation were analyzed in the condition of different soil compaction after trickle irrigation for24 h. The results indicated that the characteristic value of wet body increases with the increase of soil compaction,but the magnitude of the horizontal distance is bigger than vertical; moisture content in horizontal soil profile of wetting body is a quadratic function in relation with the horizontal distance; correlation coefficient is above0. 95; in vertical direction moisture content of soil profile of the wet body and vertical distance is a linear function relation,the correlation coefficient is above 0. 97. The soil compaction has impact on soil moisture content contour after soil moisture redistribution,that has theoretical guidance meaning to the next study on the complex double point intersection infiltration and infiltration parameters prediction model ofpoint source drip irrigation.
under the water supply condition of the point source of drip irrigation,the research ahout the characteristic value changes and its influencing factors of soil infiltration of wetting body is the premise and foundation of high level of correct design of drip irrigation system and field moisture management for the crops. Single point source soil infiltration test was conducted under membrane drip irrigation in the field; by using AUTOCAD and SURFER software,the change rule and moisture distribution about characteristic value of wetting body under membrane drip irrigation were analyzed in the condition of different soil compaction after trickle irrigation for24 h. The results indicated that the characteristic value of wet body increases with the increase of soil compaction,but the magnitude of the horizontal distance is bigger than vertical; moisture content in horizontal soil profile of wetting body is a quadratic function in relation with the horizontal distance; correlation coefficient is above0. 95; in vertical direction moisture content of soil profile of the wet body and vertical distance is a linear function relation,the correlation coefficient is above 0. 97. The soil compaction has impact on soil moisture content contour after soil moisture redistribution,that has theoretical guidance meaning to the next study on the complex double point intersection infiltration and infiltration parameters prediction model ofpoint source drip irrigation.
引文
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[8]Wry T,York J G. An identity-based approach to social enterprise[J]. Academy Manage Rev,2017,42(3):437-460.
[9]Battam M A,Sutton B G,Boughton D G. Soil pits as a simple design aid for subsurface drip irrigation systems[J]. Irrigation Science,2003,22(3-4):135-141.
[10]Reval P,Brent E. The free water pound under a trickle source:a fleld test of existing theories[J]. Irrigation Science,1996,16:169-172.
[11]张振华,杨润亚,蔡焕杰,等.土壤质地、密度及供水方式对点源入渗特性的影响[J].农业系统科学与综合研究,2004,20(2):81-84.
[12]赵颖娜,汪有科,马理辉,等.不同流量对滴灌土壤湿润体特征的影响[J].干旱地区农业研究,2010,28(4):30-35.
[13]刘雪芹,范兴科.滴灌条件下土壤水分再分布过程研究[J].干旱地区农业研究,2006,24(4):42-45.
[14]李明思,康绍忠,孙海燕.点源滴灌滴头流量与湿润体关系研究[J].农业工程学报,2006,22(4):32-35.
[2]樊贵盛,孔令超,韩永鸿,等.土壤脱水过程中结构与含水率间的定量关系[J].灌溉排水学报,2012,31(5):40-43.
[3]张振华,蔡焕杰,郭永昌,等.滴灌湿润体影响因素的试验研究[J].农业工程学报,2002,18(2):17-20.
[4]张振华,蔡焕杰,杨润亚.地表滴灌土壤湿润体特征值的经验解[J].土壤学报,2004,41(6):870-875.
[5]朱德兰,李昭军,王健,等.滴灌条件下土壤水分分布特性研究[J].水土保持研究,2000,7(1):81-84.
[6]李毅,王文焰,王全九,等.非充分供水条件下滴灌入渗的水盐运移特征研究[J].水土保持学报,2003,17(1):1-4.
[7]赵颖娜,汪有科,马理辉,等.原状土滴灌条件下水分再分布过程研究[J].灌溉排水学报,2010,29(2):44-49.
[8]Wry T,York J G. An identity-based approach to social enterprise[J]. Academy Manage Rev,2017,42(3):437-460.
[9]Battam M A,Sutton B G,Boughton D G. Soil pits as a simple design aid for subsurface drip irrigation systems[J]. Irrigation Science,2003,22(3-4):135-141.
[10]Reval P,Brent E. The free water pound under a trickle source:a fleld test of existing theories[J]. Irrigation Science,1996,16:169-172.
[11]张振华,杨润亚,蔡焕杰,等.土壤质地、密度及供水方式对点源入渗特性的影响[J].农业系统科学与综合研究,2004,20(2):81-84.
[12]赵颖娜,汪有科,马理辉,等.不同流量对滴灌土壤湿润体特征的影响[J].干旱地区农业研究,2010,28(4):30-35.
[13]刘雪芹,范兴科.滴灌条件下土壤水分再分布过程研究[J].干旱地区农业研究,2006,24(4):42-45.
[14]李明思,康绍忠,孙海燕.点源滴灌滴头流量与湿润体关系研究[J].农业工程学报,2006,22(4):32-35.
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