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生物炭添加对宁夏中部旱区土壤水分入渗及持水性的影响

Effect of Biochar on Soil Water Infiltration and Water Holding Capacity in the Arid Regions of Middle Ningxia
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摘要 为探讨生物炭含量对宁夏中部旱区土壤水分入渗及持水性的影响,采用室内一维垂直入渗法与张力计法,对生物炭添加量为0%(CK)、1%(B1)、2%(B2)、3%(B3)和4%(B4)的土壤入渗速率、湿润锋、累积入渗量及持水性进行研究。结果表明,随着生物炭含量增加,初始入渗速率、稳定入渗速率和平均入渗速率逐渐减小;120min时,与对照相比,B1、B2、B3和B4的湿润锋分别减少15%、21%、24%和26%,累积入渗量分别减少5.32%、10.95%、13.47%和19.11%,即生物炭含量增加湿润锋进程减缓和累积入渗量减小;利用Kostiakov、Philip、通用经验和Horton模型对土壤水分入渗过程进行模拟,发现Kostiakov模型最适合描述研究区不同含量生物炭的土壤水分入渗过程。vanGenuchten模型较好的拟合了生物炭添加后土壤水分特征曲线,当土壤含水量为25%时,B1、B2、B3和B4的土壤水吸力比CK增加了42%、75%、100%和163%。研究表明生物炭添加可以明显提高旱区土壤持水和保水性能,对旱作农业的发展有积极作用。 In order to investigate the effect of biochar addition on soil water infiltration and water holding capacity in the arid regions of central Ningxia, the methods of one-dimensional vertical infiltration and tensionmeter in lab were used to analyze the infiltration rate, wetting front process, cumulative infiltration and water holding capacity. The biochar was added into soil at five ratios of 0% (CK), 1% (B1), 2% (B2), 3% (B3) and 4% (B4), respectively. The initial infiltration rate, average infiltration rate and steady infiltration rate gradually decreased with the amounts of biochar addition. When the infiltration time was 120 min, the wetting front was decreased by 15%, 21%, 24% and 26%, and the cumulative infiltration was reduced by 5.32%, 10.95%, 13.47% and 19.11% in B1, B2, B3 and B4 compared with CK, respectively. With the increasing amounts of biochar addition, the wetting front slowed down and cumulative infiltration decreased. The Kostiakov model was more suitable than Philip model, empirical model and Horton model to simulate the infiltration process of soil water after the biochar addition into soil. The van Genuchten model was suitable for simulating the soil-water characteristic curve under the biochar addition. Under the 25% of soil water content, the soil water suction in B1, B2, B3 and B4 increased by 42%, 75%, 100% and 163% compared with CK, respectively. The addition of biochar could significantly increase soil water holding capacity, and have positive effects on the development of dry farming in arid regions.
作者 包维斌 白一茹 赵云鹏 张兴 王幼奇 钟艳霞 BAO Wei-bin;BAI Yi-ru;ZHAO Yun-peng;ZHANG Xing;WANG You-qi;ZHONG Yan-xia(College of Resources and Environment, Ningxia University, Yinchuan 750021, China;Arid Area Characteristic Resources and Environmental Governance Department of Education International Cooperation Joint Laboratory, Yinchuan 750021, China;Science and Technology Department of Ningxia University, Yinchuan 750021, China)
出处 《土壤通报》 北大核心 2018年第6期1326-1332,共7页 Chinese Journal of Soil Science
基金 国家自然科学基金(41461104 41761049) 宁夏高等学校科研项目(NGY2017015) 宁夏青年科技人才托举工程项目资助.
关键词 生物炭 水分入渗 模型 持水能力 砂壤土 Biochar Soil moisture Model Water holding capacity Sandy loam soil
作者简介 包维斌(1991一),男,甘肃省秦安县人,硕士,主要从事自然资源开发与持续利用研究。E—mail:baoweibinl2@163.com;通讯作者:王幼奇,E—mail:wyq0563@163.com
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