Characteristics of Land Use Change and Evaluation of Ecological Sensitivity in Chongqing [PDF]
[Objective] Chongqing, as the economic center of the upper reaches of the Yangtze River in China and a barrier to ensure ecological security in the middle and lower reaches of the Yangtze River, is a typical ecological functional and fragile area in ...
GOU Qiantao, WU Han, XIE Xianjian
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Shuitu Baochi Xuebao, 2021 基岩裸露是喀斯特地区的常见现象，形成了类似荒漠景观的"石漠化"，而石漠化的发生发展影响了区域土壤侵蚀机理和结果，故需加大石漠化因子（D）与水土流失定量关系研究，以便修正土壤流失方程。因此，在中外文献查阅的基础上，总结了岩石裸露对坡面水土流失的影响相关研究现状。结果表明，岩石裸露对坡面水土流失的影响研究结论较为离散，主要观点可分为2大类：一类观点认为，随着坡面岩石裸露率的增加，水土流失呈线性、二次函数及指数等趋势衰减，其中以指数衰减为主要方式；另一类观点认为，岩石裸露对坡面水土流失的影响具有复杂性，与坡度、
李瑞, 盘礼东
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Morphological Characteristics and Spatial Evolution Laws of Rural Settlements at Peak-cluster Depressions in Rocky Desertification Areas [PDF]
[Objective] To explore the morphological characteristics and spatial evolution patterns of rural settlements in the karst depression rocky desertification area.
LIN Guang +5 more
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Effects of Elevated Temperature and CO2 Enrichment on Stability of Soil Organic Carbon Storage in Mollisols [PDF]
, 2023 [Objective] The effects of climate change on the stability of organic carbon were revealed from the perspective of the molecular structure of organic carbon in order to provide a theoretical basis for clarifying the impact of future climate change on ...
Feng Qian +6 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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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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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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Evaluation of Eco-environmental Vulnerability of Pearl River Delta Based on PSR Model [PDF]
, 2022 [Objective] The spatio-temporal evolution characteristics and its reasons of eco-environmental vulnerability in the Pearl River delta were studied in order to provide theoretical basis for regional development.
Ma Wei, Wang Yonghong, Zheng Huiling
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Spatial-temporal Pattern of the “Grain-for-Green Project” and Its Carbon Sequestration Effect in Guizhou Province [PDF]
[Objective] To analyze the impacts of the “Grain-for-Green Project” on the ecosystem carbon stocks in Guizhou Province. [Methods] Taking Guizhou Province as an example, the spatial and temporal distribution pattern and carbon stock changes of the “Grain ...
CAI Huayin +4 more
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Shuitu Baochi Xuebao, 2022 为揭示退耕对石漠化区露石岩—土界面土壤渗透特性的影响,以典型石漠化坡耕地为对照,选择休闲地、退耕灌草和果园为研究对象,采用环刀法研究了平直、外凸和内凹型露石岩—土界面土壤渗透特性。结果表明:(1)不同退耕类型岩—土界面土壤入渗过程及特征差异较大,从初始入渗率到稳定入渗率衰减幅度在0.350~55.756 mm/min,而不同岩—土界面形状间土壤入渗速率差异较大;(2)不同退耕类型岩—土界面土壤入渗速率的主要影响因素为毛管孔隙度和非毛管孔隙度,初始入渗率、平均入渗率和稳定入渗率均与毛管孔隙度呈极显著负相关(
刘婷婷 +4 more
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