Results 71 to 80 of about 480 (146)
River-groundwater transformation and ecological effects in the Tuwei River watershed [PDF]
The Tuwei River, an important tributary of the Yellow River, located in the eastern Jiziwan region exhibits a close hydraulic connection between atmospheric precipitation, groundwater, and river-lake water in the watershed. This connection influences the
Fan GAO +5 more
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Shuitu Baochi Xuebao, 2011 "改排为蓄"是盐碱地治理方法的重大创新,为揭示蓄水条件下蓄水沟水体与相邻土壤之间的动态循环压盐机理,进行水体与土壤之间盐分运移试验.通过对蓄水水位70 cm→40 cm→20 cm的循环变化,研究水体和不同土层盐分运移规律.试验结果表明:蓄水水位由高到低循环变化对水体与土壤之间盐分运移有着至关重要的作用,当蓄水位以70 cm→40 m→20 cm的循环变化时,0-65 cm土层含盐量逐渐减少,65-100 cm土层含盐量逐渐增加.通过蓄水水位升降的循环变化,可以使表层土壤的盐分逐渐减少 ...
冯琛 +5 more
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Shuitu Baochi Xuebao目的探究河西走廊荒漠绿洲过渡带不同土地利用方式下土壤盐碱化分异特征，进一步完善该领域系统性研究的不足，为筛选抑盐减碱最优管理模式和边际土地的改良与可持续利用提供科学依据。方法通过野外调查取样和室内分析相结合的方法，对4种不同土地利用方式下（未利用地、草地、耕地、林地）0~20 cm土层的土壤酸碱度（pH）、电导率（EC）、全盐量（TSC）、总碱度（TA）、碱化度（ESP）、水溶性盐分离子组成等指标进行测定，并进行主成分和相关性分析。结果1）研究区土壤平均pH为8.69，整体呈碱性，变异性较弱（CV<
代虎明 +8 more
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Shuitu Baochi Xuebao, 2007 土壤次生盐碱化是威胁新疆绿洲灌区持续发展的关键因子。以位于塔里木河流域的渭干河灌区为例,在简要分析灌区水盐运移的控制因素基础上,以水盐均衡原理为指导,深入剖析了灌区-田块-作物根系3个尺度的土地盐分均衡特点及其相互关系,重点估算了淋洗需水量,简要讨论了次生盐碱化的驱动因子,最后从政策、技术与经济方面给出了控制次生盐碱化的对策。
陈小兵 +4 more
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Progress in developments and applications of the HYDRUS model and associated coupling model packages [PDF]
HYDRUS model is widely used in agricultural irrigation and pollution transport because it can comprehensively consider the movement of water, heat, and pollutants in the soil-plant-atmosphere system.
Bei ZHANG +5 more
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Shuitu Baochi Xuebao, 2019 为了揭示硫酸铝改良剂对苏打盐碱土在秸秆还田条件下固碳性能的影响，研究了添加秸秆和硫酸铝并于恒温条件下培养300天后的盐碱土对腐殖酸的吸附性能。结果表明：在腐殖酸吸附动力学中，秸秆和硫酸铝不同添加量条件下，盐碱土对腐殖酸的吸附均在120 min时达到平衡，准二级动力学方程拟合效果最好，R2值最高（0.936）。Langmuir方程和Freundlich方程均可较好地拟合盐碱土对腐殖酸的等温吸附。添加相同比例的玉米秸秆条件下，Langmuir方程拟合获得的最大吸附量分别表现为69.335，42.830，40.
张鑫 +4 more
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Exploration on the Stratification of the Ground Substrate Survey and the Design and Construction of Its Testing Indicator System [PDF]
The ground substrate layer is the main carrier of the material and energy cycle of the earth’s surface. At present, it is essential to have a suitable ground substrate stratification and testing index system for conducting an effective ground substrate ...
Aibing HAO +13 more
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Research on soil improvement and engineering application under mixed application of environmental materials in alpine mining areas [PDF]
To address the issues of inadequate topsoil structure, soil erosion, and low soil fertility in the reclamation of alpine mining areas. Taking Qinghai West Copper Mine as an example, this study investigates the impact of three materials—sheep manure(A ...
Jie REN +4 more
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Shuitu Baochi Xuebao, 2008 针对西北等干旱地区土地次生盐渍化的问题,以室内试验为基础,测定盐碱土在不同滴灌施钙浓度下水盐运动过程,研究了不同施钙浓度对盐碱土土壤盐分运移和水分运动的影响。结果表明,不同施钙浓度的湿润锋水平、垂直最大运移距离与钙离子浓度之间均符合线性关系,湿润锋的水平、垂直运移距离与入渗时间之间符合幂函数关系,随着湿润锋水平、垂直湿润距离的增加,不同滴灌施钙浓度的土壤含盐量、钠离子含量均在不断增加,随着施钙浓度的增加,脱钠区深度系数增大,脱盐效果明显。
孙海燕, 王全九, 刘建军
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[Low-oxygen-affinity hemoglobinopathy Hemoglobin Sunshine Seth: a case report and literature review]. [PDF]
Zhonghua Xue Ye Xue Za Zhi, 2023 Chang L +4 more
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