不同灌溉施肥模式下土壤湿胀干缩特征曲线及其滞后效应

采用淹灌、间歇灌2种灌溉模式与不施氮肥、含氮复合肥、缓控释氮肥、有机无机氮肥4种施肥模式配成8个处理开展水稻种植田间试验,研究了不同灌溉施肥模式下土壤湿胀干缩特征曲线及其滞后效应。结果表明：指数模型能较好地描述不同灌溉施肥模式下的土壤收缩过程与土壤膨胀过程;各模式下土壤干缩特征曲线与湿胀特征曲线指数模型中的a值（干土的比容积,即干土体积质量的倒数）和b值（单位含水量变化时土壤比容积变化的自然对数单位值）存在差异;土壤干缩曲线与湿胀曲线不完全重合,二者的b值及其差异也不同,存在滞后现象;土壤湿胀干缩效应受多种土壤性质的影响,其中主要通过土壤孔隙结构与持水性质的影响体现。...

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Bibliographic Details
Published in农业工程学报 Vol. 29; no. 11; pp. 78 - 84
Main Author 陈祯 崔远来 刘方平
Format Journal Article
LanguageChinese
Published 水资源与水电工程科学国家重点实验室,武汉 430074%武汉理工大学机电工程学院,武汉 430070%江西省灌溉试验中心站,南昌 330096 2013
Subjects
土壤
水稻土
湿胀干缩特征曲线
滞后效应
灌溉
肥料
滞后效应
wet expansion and dry shrinkage
灌溉
irrigation
湿胀干缩特征曲线
hysteresis effect
肥料
soils
水稻土
fertilizer
土壤
paddy
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ISSN1002-6819
DOI10.3969/j.issn.1002-6819.2013.11.010

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Summary:采用淹灌、间歇灌2种灌溉模式与不施氮肥、含氮复合肥、缓控释氮肥、有机无机氮肥4种施肥模式配成8个处理开展水稻种植田间试验,研究了不同灌溉施肥模式下土壤湿胀干缩特征曲线及其滞后效应。结果表明：指数模型能较好地描述不同灌溉施肥模式下的土壤收缩过程与土壤膨胀过程;各模式下土壤干缩特征曲线与湿胀特征曲线指数模型中的a值（干土的比容积,即干土体积质量的倒数）和b值（单位含水量变化时土壤比容积变化的自然对数单位值）存在差异;土壤干缩曲线与湿胀曲线不完全重合,二者的b值及其差异也不同,存在滞后现象;土壤湿胀干缩效应受多种土壤性质的影响,其中主要通过土壤孔隙结构与持水性质的影响体现。
Bibliography:11-2047/S
Chen Zhen, Cui Yuanlai, Liu Fangping （1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan 430074, China; 2. School of Mechanical and Electronic Engineering of Wuhan University of Technology, Wuhan 430070, China; 3. Jiang Xi Province Irrigation Experiment Station, Nanehang 330096, China）
Farmland soil is often in alternating wet and dry state, which seriously affected the change of soil composition and properties, and thus changed soil hydraulic properties. During the course of alternation of wetting and drying, along with the change of water content, soil bulk density would change accordingly. The experimental investigations of this paper were carried out in irrigation field of Jiangxi province irrigation experiment station. The rice planting field trials were launched by employing experimental treatment with two irrigation modes including flooding, intermittent irrigation and four fertilization mode including no nitrogen fertilizer, nitrogen-containing compound fertil
ISSN:1002-6819
DOI:10.3969/j.issn.1002-6819.2013.11.010