检索结果-南通市图书馆

Soil erosion evaluation and prediction approach using 137 Cs, RS, and GIS in xiaojiang River basin of China

遥感学报 2014年第4期18卷 887-901页

作者： GE Yonggang CUI Peng LIN Yongming ZHUANG Jianqi JIA Songwei Key Laboratory of Mountain Hazards and Earth Su~Cace Processes/Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China College of Forestry Fujian Agriculture and Forestry University Fuzhou 350002 China College of Geology Engineering and Geomatics Chang'an UniversityXi'an 710054 China School of Economics Henan University of Science and Technology Luoyang 471023 China

It is difficult to evaluate and predict soil erosion and its related effects in mountainous areas without sufficient observation data. This study aimed to estimate and predict changes in soil erosion using 137 Cs, RS, and GIS techniques and propose an approach for soil erosion evaluation in mountainous areas. Using the erosion modulus calculating models based on 237 Cs concentration, the annual average soil erosion modulus of forest lands, shrub lands, grasslands, farmlands, and uncovered land were obtained. The values were 356--1531 t/（km2-a）, 330--1709 t/（km2-a）, 886--3885 t/（km2·a）, 5197--12454 t/（km2.a）, and more than 15000 t/（km2 · a）, respectively. Then, erosion zoning was done by combining erosion rates and land use data by interpreting remote sense images from 1987 （Landsat TM）, 1995 （Landsat TM）, and 2005 （Landsat ETM）, and these were overlaid with 1 ： 50000 DEM data. The results showed that the eroded land changed very little from 1987 to 2005, accounting for about 66%--67.3% of the total; however, the erosion intensity significantly rose from 1987 to 1995, up to 30% for some land use types. The eroded land, with the erosion modulus of 2500--5000 t/（km2· a）, 5000--8000 t/（km2· a）, and 8000--15000 t/（km2· a） rise 30%, 23%, and 26%, respectively. The soil erosion amount in the xiaojiang River basin was 7.51 ×10^6 t/a, 8.19×10^6 t/a, and 8.18×10^6 t/a in 1987, 1995, and 2005, respectively. Moreover, the zoning and amount of soil erosion for 2015 was predicted using a Markov-Cellar Automata Model, which was established using the data from 1995 and 2005. The predicted result, 8.17 ×10^6 t/a, was very similar to that from 2005. This study provides a valuable solution to evaluate and predict soil erosion for mountainous areas in southwest China.

关键词： soil erosion estimation prediction 137Cs RS GIS xiaojiang River basin

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The Grouping of the Strike-Slip Offset Data and Its Relation With the Seismicity Along Middle Segment of the xiaojiang Active Fault

引用

Earthquake Research in China 1998年第2期12卷 58-69页

作者： Shen Jun,Wang Yipeng,Song Fangmin,Yu Weixian,Cao Zhongquan,Shen Xuhui,Hou Xueying,and Li ZhixiangInstitute of Geology,SSB,Beijing 100029,ChinaInstitute of Earthquake Engineering,Seismological Bureau of Yunnan Province,Kunming 650204,China

The data of the strike-slip offset along the xiaojiang active fault can be obviously *** groups of small orders of magnitude data within 100 m show clear linear characteristics of increments between 8 m and 12 m,which indicates that the segments of the xiaojiang active fault is of characteristic seismicity and the distribution of the values of each group indicates that there are smaller earthquakes and creep between two large earthquakes along each segment of the xiaojiang active *** interval between two characteristic large earthquakes can be calculated with the increments for two groups of slip data and the slip rate of the ***,the frequency of smaller earthquakes can also be estimated by comparing the distributions of the displacements of the large earthquakes with the distributions of the values of each group of *** groups of large slip displacements show that there is close relationship between the records of the displacements of the fault and the changes of the

关键词： xiaojiang active fault zone Grouping characteristics of offsets Seismicity Linear increment.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

First report on Guanshan Biota(Cambrian Stage 4) at the stratotype area of Wulongqing Formation in Malong County, Eastern Yunnan, China

引用

Geoscience Frontiers 2019年第4期10卷 1459-1476页

作者： Feiyang Chen Zhifei Zhang Marissa J. Betts Zhiliang Zhang Fan Liu State Key Laboratory of Continental Dynamics Shaanxi Key Laboratory of Early Life and EnvironmentsDepartment of GeologyNorthwest UniversityXi’an 710069China Division of Earth Sciences School of Environmental and Rural ScienceUniversity of New EnglandArmidaleNSW 2351Australia

Exceptionally preserved fossils,such as those from Cambrian Burgess Shale-type fossil-Lagerstatten are critical because of their unique contributions to knowledge of the phylogenetic radiation and palaeoecological expansion of metazoans during the Cambrian ***,these deposits provide information that is usually unobtainable from shelly and skeletonized fossils *** Guanshan Biota(Cambrian Series 2,Stage 4)in the Yunnan Province of South China,has produced abundant and diverse,exquisitely preserved fossils that often retain soft tissues and *** date,most fossils from the Guanshan Biota have been collected from localities such as Gaoloufang and Gangtoucun,which have become inaccessible due to new urban expansions and constructions of residential *** we present the first report of soft bodied fossils from a new section at Kanfuqing,close to the Wulongqing village in Malong County,approximately 3 km east of the Wulongqing Formation stratotype *** retain soft morphology,and include brachiopods with delicate marginal setae,priapulids with well-preserved sclerites and vetulicolians with entire sections of *** addition,this fauna includes rare occurrences of trilobites preserved with soft tissues replicated as pyrite pseudomorphs after *** discovery represents an important palaeogeographical extension of soft-bodied fossils of the Guanshan fauna to the east of the xiaojiang Fault(related to Tsinning tectonic movements ca.700 Ma).The fauna from the new Kanfuqing section is similar to that reported from the Wulongqing Formation west of the xiaojiang Fault,and thus has significant implications for early Cambrian palaeogeography,faunal successions and palaeoenvironments of eastern Yunnan.

关键词： Guanshan Biota Early Cambrian xiaojiang Fault Eastern Yunnan Palaeoenvironment Palaeogeography

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：