Results 11 to 20 of about 67 (64)
Characteristics and Drivers of Spatial and Temporal Soil Erosion in Anshun City, Karst Region [PDF]
[Objective] To explore the spatial and temporal evolution of soil erosion in Anshun City, southwest karst region, as well as the main controlling factors of soil erosion, and to master the soil erosion situation in the region, in order to help the ...
LI Yuan, LIU Ziqi, WU Wenxian
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Transpiration Characteristics of Common Trees and Their Responses to Meteorological Factors in Secondary Forests on Karst Slopes [PDF]
[Objective] To explore the transpiration characteristics of common trees and their responses to meteorological factors in secondary forests on karst slopes.
DAI Quanhou +3 more
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Shuitu Baochi Xuebao, 2021 为探讨适合于西南喀斯特地区石漠化治理的有效生物措施，以典型喀斯特流域——打邦河为研究区，以SWAT模型模拟为基本研究手段，以打邦河流域黄果树水文站、高车水文站连续多年实测水文数据作为基础率定资料，设置6种石漠化治理措施情景，分别模拟各治理措施的产流特征，从产流特征探讨不同措施的生态效益。结果表明：（1）率定期（2008—2013年）黄果树水文站R2=0.86，NSE=0.77，高车水文站R2=0.76，NSE=0.63；验证期（2014—2018年）黄果树水文站R2=0.79，NSE=0.57 ...
石漠化治理措施的响应袁江 +5 more
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Effects of Different Logging Residue Treatments on Acid Hydrolyzed Soil Organic Carbon Fractions and Soil Microbial Communities in a Chinese Fir Plantation [PDF]
[Objective] Acid hydrolyzed soil organic carbon fractions are important in soil, and the changes of their contents will affect soil microbial community composition.
GUO Jianfen +5 more
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Characteristics of groundwater circulation in typical karst trough areas：A case study of Longtan trough valley in Youyang, Chongqing [PDF]
Although the southwest karst valley region of China has an abundance of groundwater resources, little is known about the variations in the karst trough valley’s groundwater types and their cycle features. Using the Chongqing Youyang Longtan trough valley
Lian LI +4 more
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Shuitu Baochi Xuebao, 2004 通过定位、半定位观测,对贵州喀斯特山区石漠化治理过程中土壤质量特性进行研究,探讨贵州喀斯特山区生态恢复过程中土壤特性以及土壤肥力变化规律。试验结果表明:喀斯特地区石漠化综合治理对土壤物理化学性质的影响较为明显,表现为表层土壤有机质增加,土壤容重降低,孔隙度增加,土壤理化性质改善,保水保肥能力和通道性增加;同时,土壤微生物数量增加,土壤微生物数量增加程度表现为细菌>放线菌>真菌,土壤肥力改善,生产力逐渐提高。
罗海波 宋光煜 何腾兵 刘丛强 刘方 刘元生 钱晓刚
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Shuitu Baochi Xuebao, 2023 为揭示造林20年后不同石漠化恢复模式对土壤结构和理化性质的影响,以滇中地区7种恢复模式下样地土壤为研究对象,研究不同石漠化恢复模式下土壤理化性质分布特征并进行多指标聚类分析。结果表明:除油杉林外,其他样地土壤养分等级均为中高级;土壤颗粒组成较为合理,分形程度较好,抵抗侵蚀的能力较强;不同恢复类型对石漠化土壤的改良存在明显不同,混交林明显优于纯林;由于受土壤母质、地形以及水文等因素的影响,相同恢复类型间存在差异,华山松林和油杉林总体较差;研究区土壤可蚀性因子K值与粉粒含量呈正向变化特征 ...
张叶飞 +3 more
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A Research Based on 2DPCA of handwritten digit recognition [PDF]
, 2013 二维主元素分析(2dPCA)是基于二维图像,而不是像PCA一样基于一维的向量化图像,是一种用于人脸识别中的典型的特征提取技巧,与传统的PCA方法相比,它具有更高的识别率和更短的特征提取时间。运用2dPCA的手写体数字识别方法,与PCA方法在误识率上进行了数值对比试验。然后,在特征提取阶段进行改进,它是一个样本图像分组策略,称之为nETPCA,此方法比较好的综合了统计特征和结构特征两种提取方法。Two-dimensional principal component analysis(2DPCA) is ...
卢琳璋, 田咏梅
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Shuitu Baochi Xuebao, 2018 日趋严重的西南喀斯特石漠化问题，已严重威胁该地区的生态环境安全、人民生活和社会经济发展。系统综述了喀斯特石漠化的研究进展，主要针对石漠化概念、石漠化类型界定标准、成因等进行了论述。同时，针对喀斯特地区水土流失的研究动态进行了总结，阐述了石漠化与水土流失的相互关系，重点揭示了当前喀斯特地区地下水土流失研究存在的问题与不足。进而根据当前研究热点和不足进行了展望，提出下阶段的研究重点，即：根据当前工作重心重新制定石漠化类型界定标准，从研究方法和技术上革新，推进喀斯特地下水土流失机理及量化研究 ...
戴全厚, 严友进
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Free Iron Determination in Soil by Flame Atomic Absorption Spectrometry [PDF]
Free iron oxide in soil is a product of weathering, migration, and transformation of soil parent materials. Its form, activation, and aging degree can reflect the soil forming process and environment.
Chun YANG +6 more
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