oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
西南地区石漠化分布、演变特征及影响因素
Analysis of Characteristics and Reason of Rocky Desertification Occurrence and Evolution in Karst Areas of Southwestern China
 [PDF]

安国英,周璇,温静,童立强
AN Guoying
,ZHOU Xuan,WEN Jing,TONG Liqiang

- , 2016,
Abstract: 摘要: 根据中国西南岩溶区1999—2008年石漠化遥感调查结果,研究了该区石漠化发生现状和近十年间石漠化在区域、岩性、地貌及区域经济等方面的演变特征,并对发生石漠化的影响因素进行分析。结果显示,石漠化集中分布在滇、黔、桂三省区;石漠化的发生与岩性和地貌密切相关,其中纯碳酸盐岩中石漠化发生率高于杂碳酸盐岩,并随灰岩或碳酸盐岩含量减少而降低,而地形高差相对大的峰丛洼地、峰林洼地石漠化发生率最高,并随地貌相对高差变小而降低。石漠化发生程度与岩性、地貌关系表现多样,纯碳酸盐岩中轻度石漠化比例高于中度和重度石漠化之和的比例,杂碳酸盐岩中中度和重度石漠化之和的比例高于轻度石漠化比例;在峰林洼地、峰林/缓丘平原中轻度石漠化比例高于中度和重度石漠化之和的比例,缓丘台地和丘陵谷地中中度和重度石漠化之和的比例高于轻度石漠化,是岩溶构造演化与人类活动共同制约的结果。从1999年到2008年间,该区石漠化已经呈现转轻趋势,主要表现在总面积减少,石漠化程度减轻;石漠化演变过程中发生在不同岩性和地貌中改善或恶化发生率的变化趋势与上述石漠化的发生规律相似。石漠化还不同程度地影响居民的生活水平,调查显示,严重石漠化县域内石漠化面积与农民人均纯收入、人均生产总值等呈负相关,县域内石漠化面积是影响农民人均纯收入,乃至人均生产总值最重要的因素。因此,石漠化调查结果显示,研究区石漠化呈向好趋势,但是治理难点依然存在。
Abstract: Using the rocky desertification data from remote sensing survey,this paper researched rocky desertification distribution and evolution during the past nearly decade from 1999 to 2008 in the karst areas of southwest China, including spatial region, carbonate lithology,karst topography,economic development and so on, and analyzed preliminarily the influencing factors of rocky desertification. The result shows that the distribution of rocky desertification concentrates in Yunnan, Guizhou and Guangxi provinces,and rocky desertification distribution is closely related to the different lithologic compositions and karst geomorphologies; the occurrence rate of rocky desertification is higher in the pure carbonate rock than that in the impure,decreasing with limestone or carbonate becoming smaller; the occurrence rate is the highest in the peak forest and cluster topography which is high terrain elevation and easily occurs rocky desertification, decreasing with the relative height of landscape becoming smaller. And correlations between desertification extent and lithology or landform are diverse, and the proportion of lowextent rocky desertification is higher than the proportion of moderateand severeextent in pure carbonate rocks, but the proportion of moderateand severeextent rocky desertification is higher than the proportion of the low extent in impure carbonate; the proportion of lowextent rocky desertification is higher than that of the moderateand severeextent in peak depression and plain landforms, and the proportion of moderateand severeextent rocky desertification is higher than that of the low extent in hilly terraces and hilly valley, and all those are affected by tectonic environment evolution and human activities. At the same time, from 1999 to 2008, it had become a good trend of rocky desertification evolution to reduce the total area and to relieve the extent, and the trend for worsening occurrence rate or improvement of the
浅谈砚山县石漠化成因及其治理中存在的问题
Causes of Rocky Desertification and the Issues in Governance in Yanshan County
 [PDF]

王婷, 陆艳, 陆贵文, 赵敏慧
Advances in Environmental Protection (AEP) , 2013, DOI: 10.12677/AEP.2013.32006
Abstract: 喀斯特石漠化是近年来所认识到的一种地质生态灾害,是脆弱生态环境和不合理人类活动的共同产物。本文阐述了砚山县石漠化现状和危害,从岩性、地貌、降水和超载的人口压力分析了该县石漠化产生的原因,并结合当地实际情况讨论该县在石漠化治理过程中存在的一些问题,并提出解决对策。
Karst rocky desertification has been recently regarded as a kind of geological-ecological disaster, which was caused by both fragile ecological environment and improper human activities. This paper expounds the present situation and hazard of rocky desertification in Yanshan County, and analyzes the causes of the county rocky desertification from the lithology, topography, precipitation, and the excess of population pressure, then discusses some problems existing in the rocky desertification process in the county combined with the actual conditions, finally solutions to countermeasures are proposed.
Dynamic Behavior Characteristics and Classification Assessment of Karst Rocky Desertification
石漠化斑块动态行为特征与分类评价

LI Yangbing,LI Weihai,WANG Shijie,LUO Guangjie,CHENG Anyun,
李阳兵
,李卫海,王世杰,罗光杰,程安云

地理科学进展 , 2010,
Abstract: 对石漠化土地的特征进行全面深入的探讨,有助于石漠化土地分类治理和生态恢复重建。本文以SPOT5影像(分辨率2.5m)和航片(空间分辨率1m)为基本数据源,辅以实地踏勘和农户访问,通过跟踪每个石漠化斑块在2个时段的演变关系,研究了贵州清镇簸箩村1973-2005年石漠化斑块的新增(延展、新生)、消融和未变等动态变化特征。结果发现轻度石漠化土地斑块与其他石漠化类型在空间上存在着强烈的转换,相互之间的频繁转换使斑块具有不稳定性而处于一种波动状态。从各类石漠化斑块的来源看,存在一些斑块由无石漠化直接到极强度石漠化斑块之间的转换。根据石漠化斑块的动态演替行为认为,可将研究区2005年的石漠化分为未变石漠化、新生石漠化、延展石漠化,并据此提出石漠化强度指数和石漠化的治理对策。
Vertical variability of rock desertification in Karst mountainous areas
喀斯特山地石漠化的垂直变异

LUO Lin,ZHOU Ying-Shu,HE Xing-Hui,XIE Yong-Gui,WANG Min,WU Ming-Yan,
罗林
,周应书,何兴辉,谢永贵,王敏,吴明艳

生态学报 , 2009,
Abstract: 应用地统计学对地处滇黔桂连片喀斯特腹地,海拔垂直梯度变化范围广的贵州省毕节地区石漠化指标垂直梯度的空间变异进行分析.基岩裸露率的半变异函数最佳理论模型为线性有基台模型,植被覆盖率、砾石含量为球状模型.植被覆盖率的空间异质比为22.32%,具有强烈的垂直梯度空间相关性,主要受到随海拔梯度变化的自然性控制因素作用;基岩裸露率、砾石含量的空间异质比分别为34.38%、25.97%,均具有中等程度的垂直梯度空间相关性,受随机因素作用较大.砾石含量、植被覆盖率的变程分别为968.10m、859.48m,受因素影响的海拔范围都较宽;基岩裸露率的变程为52.28m,受因素影响的海拔范围很窄.基岩裸露率、植被覆盖率的Moran′s I系数随海拔梯度变化的趋势相类似,但砾石含量的差别较大.
Theoretical model for rocky desertification control in Karst area
喀斯特地区石漠化治理的理论模式探讨

LIANG Liang,LIU Zhi-xiao,ZHANG Dai-gui,DENG Kai-dong,ZHANG You-xiang,
梁亮
,刘志霄,张代贵,邓凯东,张佑祥

应用生态学报 , 2007,
Abstract: Based on the basic principles of restoration ecology,the trigger-action model for rocky desertification control was proposed,i.e.,the ability that an ecosystem enables itself to develop was called dominant force,and the interfering factor resulting in the deviation of the climax of ecological succession from its preconcerted status was called trigger factor.The ultimate status of ecological succession was determined by the interaction of dominant force and trigger factor.Rocky desertification was the result of serious malignant triggers,and its control was the process of benign triggers in using the ecological restoration method of artificial designs to activate the natural designing ability of an ecosystem.The ecosystem of Karst rocky desertification in Fenghuang County with restoration measures was taken as a case to test the model,and the results showed that the restoration measures based on trigger-action model markedly improved the physical and chemical properties of soil and increased the diversity of plant.There was a benign trigger between the restoration measures and the Karst area.The rationality of the trigger-action model was primarily tested by the results in practice.
The Correlation between Rock Desertification and Lithology in Karst Area of Guizhou
贵州岩溶地区岩性与土地石漠化的 相关分析

LI Ruiling,WANG Shijie,ZHOU Dequan,ZHANG Dianf,LI Fengquan,ZHOU Zhongf,XIONG Kangning,
李瑞玲
,王世杰,周德全,张殿发,李凤全,周忠发,熊康宁

地理学报 , 2003,
Abstract: Based on 1:500,000 digital map of lithology distribution in Guizhou, spatial analysis of the maps of rock desertification and of lithology is conducted by GIS. Results indicate that there is obvious relativity between rock desertification and lithology. Intense rock desertification scatters maily in pure carbonate rock area, especially in pure limestone area whereas moderate rock desertification is more widely distributed in dolomite association than in limestone association and slight rock desertification is widely distributed in carbonate rock association layered with clastic rock.
KARST ROCKY DESERTIFICATION: FORMATION BACKGROUND, EVOLVING AND COMPREHENSIVE TAMING
喀斯特石漠化的形成背景、演化与治理

Wang Shijie Li Yangbing Li Ruiling,
王世杰
,李阳兵,李瑞玲

第四纪研究 , 2003,
Abstract: Karst rocky desertification is not only a geo-ecological disaster induced by uplift of Qinghai-Xizang Plateau in its southeast flank, but also a critical factor to constrict the social and economic development of Southwest China. It is not an absolute natural process, and relates to human activity tightly. It is a process of land degradation involving serious soil erosion, vast exposure of basement rocks, drastic decrease of soil productivity and the appearance of a desert-like landscape. In essence, karst rocky desertification is caused by irrational, intensive land use in fragile karst geo-ecological environment. The process is expanding rapidly, and it is daily reducing the living space of residents and is the root of disasters and poverty in the karst areas of Southwest China. Therefore, it possesses natural and social characteristics obviously. This paper expounds emphatically the formation character and evolving mode of karst rocky desertification and its guidance significance to comprehensive harnessing from the angles of geological and ecological viewpoints. Soil and vegetation are the most sensitive elements in karst mountain areas of Southwest China and have obvious fragile characteristics compared with non-karst areas. The rapid variation of karst soil and vegetation under anthropogenic disturbance induces the changes of surface hydrological conditions and the formation of karst rocky desertification. It is specially pointed out the influence of difference of lithology of basement carbonate (carbonate rock and dolomite), the diversity of eco-environmental types and the evolving modes and processes of plants on the operation mechanism of karst eco-system and its practical guidance to ecological rehabilitation. Finally, this paper puts forward some suggestions and opinions about land use patterns and ecological rehabilitation as well as the research trends in the future.
The Correlation Analysis of Desertification of Karst Rock and Land Use Patterns
喀斯特石漠化与土地利用相关性研究

LI Yang-bing,BAI Xiao-yong,QIU Xing-chun,ZHOU Guo-fu,LAN An-jun,ZHOU Xu,XIONG Kang-ning,
李阳兵
,白晓永,邱兴春,周国富,兰安军,周绪,熊康宁

资源科学 , 2006,
Abstract: Based on data of Karst land desertification and land use in 2004(scale: 1:50 000),the law of distribution of Karst land are revealed and occurrence ratio of rocky land desertification in Huangping county are explored quantitatively.Results indicate that there is a correlation between different grade rocky desertification and land use types.The shrub land,sparsely covered grass slopes,unused land,slope cropland and rocky dry-land have a higher occurrence ratio of karst rocky desertification.Slight rocky desertification occurs in sparse and moderate coverage grass slopes;moderate rocky desertification occurs in unused land and moderate coverage grass slopes and rocky dry land;intense rocky desertification occurs in rocky dry land and unused land.The rate of occurrence of moderate rocky desertification is 4.17% in shrub-land;the rate of slight rocky desertification is 62.09% in sparse coverage grass slopes;the rate of moderate rocky desertification is 56.95% and the rate of intense rocky desertification is 5.43% in unused land;the rate of moderate rocky desertification is 5.21% in slope cropland;and in rocky dry-land the proportion of moderate rocky desertification is 56.78%.In study area,these correlations between land use pattern and different grade rocky desertification varies with districts and are affected by such factors as category of rock.In the lithology and dolomite dominated area,the occurrence ratio of rocky desertification is greater than others.Large area of grass hills with dolomite distribution has taken place rocky desertification in various degrees.
Model for Rock Desertification Control and Agricultural Comprehensive Development in Karst Mountainous Area of Northern Guangdong
粤北岩溶山区土地石漠化治理与农业综合开发模式研究

HUANG Jin-guo,LI Sen,WEI Xing-hu,
黄金国
,李 森,魏兴琥

中国沙漠 , 2008,
Abstract: The karst mountainous area of northern Guangdong is the main distribution region of rock desertification in Guangdong province. Although the rock desertification land in this region is gradually decreasing due to controlling in the past years, the rock desertification is still the main restriction factor of eco-environment and social economy development. Based on the analysis of the present situation of karst desertification in northern Guangdong and according to the actual situation of natural, social and ecological development, this paper put forth the models for rock desertification control and agricultural comprehensive development in the karst mountainous area and plateau and in the karst hill and depression of northern Guangdong. The models aim to combine rock desertification control with economic development, and to promote rock desertification control by approach of developing economy.
Cause and Processes of Rocky Desertification Lands in Karst Areas of South China
中国南方岩溶区土地石漠化的成因与过程

LI Sen,WEI Xing-hu,HUANG Jin-guo,WANG Ming-gang,LUO Hong-bo,LI Hong-bing,
李 森
,魏兴琥,黄金国,王明刚,罗红波,李红兵

中国沙漠 , 2007,
Abstract: The karst areas of south China are vulnerable ecological regions,where rocky desertification is widely developed.The article proposed a new concept of rocky desertification,realized that rocky desertification is the processes of land degradation with similar rocky desertification landscape which formed by degeneration of vegetation,erosion of soil,loss of surface water and the outcropping of bedrock under moist and semi-moist climatic environment and under the factors of human activity and(or) changes of climate etc.There are two causes of rocky desertification in karst areas of south China,the natural and the human driving factors.From geologic time to historical periods there experienced natural processes of rocky desertification.From historical periods to modern age there added human driving processes and human beings' activity fasten the development of rocky desertification.The initial and middle periods of Qing dynasty are important transition time,and from then on the human driving factors become the main influential factor.Rocky desertification process is the surface ecological processes including the processes of vegetation degeneration,soil erosion,water loss,bedrock dissolution and erosion and land biological productivity degeneration;its essence is the processes of land degradation forming similar rocky desertification landscape.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.