检索结果-南通市图书馆

Wuhan University Journal of Natural Sciences 2006年第4期11卷 1046-1051页

作者： CHEN Guangjian 1, 2, 3., LIU Qing 1 1. chengdu Institute of Biology, Chinese academy of Sciences, chengdu 610041,{3.,china 2. Graduate University of Chinese academy of Sciences, Beijing 100049, china 3. academy of land reconnaissance and layout of sichuan province , chengdu 61003.,{3., china chengdu Institute of Biology Chinese Academy of Sciences Chengdu Sichuan China Graduate University of Chinese academy of Sciences Beijing China academy of land reconnaissance and {3. of sichuan province Chengdu Sichuan China

This paper established sustainable land resources evaluating indicators fit for hilly area in sichuan Basin, Southwest of china, and evaluated the case of sustainable land management of Lezhi County from 1990 to 2001. The result showed that the land resource sustainable utilization ability in Lezhi County is belong to Second level （better sustainable）. Secondly, this paper diagnosed some years obstacles of sustainable land management of Lezhi County from base period to goal period and compared the obstacles factors in the indicators system. There were 16 indexes orderly become major affect factor to land sustainable utilization of Lezhi county in indicator system, of which there are 8 obstacles indexes exist both in 1990 and 2001. The value of obstacles degree of five indicators exceeded 5 in 1990, but in 2001, only two indicators＇ values were more than 5.

关键词： land resources sustainable land management assessment indicators diagnosis of obstacle

Monitoring the Cultivated Slope land in the Three Gorges Reservoir Area Based on Remote Sensing and GIS

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2006年第4期11卷 915-921页

作者： ZHOU Jieming1, ZHOU Qigang 2, 3.,HUANG Zhiqin 2, 3. 4 1. The Faculty of Geography and Resources Science, sichuan Normal University, chengdu 610066, sichuan,{3. 2. Institute of Mountain Hazards and Environment, Chinese academy of Sciences, chengdu 610041, sichuan,{3. 3. Graduate University of the Chinese academy of Sciences, Beijing 100049,{3. 4. Information Center of land and Resources Department of sichuan province, chengdu 610041, sichuan,{3. The Faculty of Geography and Resources Science Sichuan Normal University Chengdu Sichuan China Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu Sichuan China Graduate University of the Chinese academy of Sciences Beijing China Information Center of land and Resources Department of sichuan province Chengdu Sichuan China

By means of combining auto-extraction with manual interpretation, the current distribution information about cultivated land is obtained. The distribution information of 1992 is extracted from the dynamic polygons of 2002. The monitoring mini-system of the cultivated slope land is established. In the system, detailed surveys, focused on the resources of cultivated slope land, are carried out. The results indicate that the area of the cultivated slope land is very large. Meanwhile, there are lots of cultivated steep slopes with gradient above 3.°. The areas of steep land cultivated had been slowly reduced from 1992 to 2002. At the same time, the pressures of returning farm land to forestry are great in all counties. The conflicts between population growth, insufficient grain supply and stagnant economic development sharpen increasingly. It is inevitable to improve the agricultural structure.

关键词： slope land cultivated remote sensing geography information system (GIS) the pressure of returning farm land to forestry Three Gorges Reservoir Area

在线全文

学校读者我要写书评

暂无评论

岷江上游干旱河谷灌丛研究

山地学报 2007年第1期25卷 1-32页

作者：杨钦周四川省林业调查规划院四川省林业勘察设计研究院四川成都610081

岷江上游干旱河谷灌丛现代植物区系的基本特征是温带分布属占优势而含有较多的热带分布属,以及拥有许多古地中海残遗种和本地特有种,其与古地中海在时间上、与现代中亚(草原和荒漠)在空间上有着渊缘联系,热带属的种与温带荒漠、草原种... 详细信息

岷江上游干旱河谷灌丛现代植物区系的基本特征是温带分布属占优势而含有较多的热带分布属,以及拥有许多古地中海残遗种和本地特有种,其与古地中海在时间上、与现代中亚(草原和荒漠)在空间上有着渊缘联系,热带属的种与温带荒漠、草原种在此巧妙地聚集和组合是干旱河谷的特有现象,它可能是古地中海植物区系的延续和残遗的反映,在某种意义上可能是历史植物区系的'活化石'。幽深而封闭的峡谷地貌和青藏高原亚热带山地半干旱的暖温气候,以及干燥而贫瘠的山地(碱性)灰褐土是干旱河谷灌丛生境的基本特征。土壤湿度(水分相对含量)和肥力(有机质相对含量)的梯度分析,显示出半干旱-半贫瘠的土壤为其代表性的也是主要的生境类型。一种既无乔木群落(森林)又无草本群落(草原或草甸),而仅有矮灌木和半灌木占优势的灌木群落(矮灌丛),盖满了干旱河谷沿岸干燥山坡的荒凉景观,是岷江上游干旱河谷自然植被的现状概貌和基本特征。干旱河谷灌丛形成于特定的生态环境和地质历史的时空中,是一种处于森林与草原之间的而近似于草原灌丛的隐域性(非地带性或超地带性)植被。其含有的众多中亚荒漠、草原种,在干旱河谷多为中生或中生耐旱特性。因此,干旱河谷灌丛不是草原也更不是荒漠,而是中国-喜马拉雅地区夏雨性的冬旱灌丛(群系纲),它与地中海型气候的冬雨性夏旱灌丛(群系纲:如地中海的Macehia和北美洲的Chaparral等)同属于干旱(季节性)灌丛植被型的两个群系纲(Formation class)。从干旱河谷灌丛数量分析的样地相关性半矩阵中,析出的具有三角形网眼的灌丛之群系关联网(Relative net)和群系之样地关联网,显示了灌丛核心群系和群系的典型样地在关联网中的相关位置。干旱河谷灌丛沿着地质历史的长河在地貌形成与演化过程中,大约在上新世(或许更早)青藏高原尚处于夷平面发育时期,早先的干热性古植被(森林草原)中,就可能已经孕育着干旱河谷灌丛的雏型,至少与邻近的横断山区干旱河谷及中亚的荒漠、草原区(或泛、古地中海区)拥有许多共有种,继而在整个第四纪中不断发展和逐渐形成。在全新世最新的深切河谷中生存着第三纪古老植被的残遗类型和衍生后裔,是现代干旱河谷灌丛起源古老的历史性反映和植被现状的基本特征,它应该是一种原生性的植被(或顶极群落)。建立封山、禁止放牧和樵采以及保护自然植被的有效管理机制,综合开发干旱河谷自然环境中水、热优势资源的直接和间接的多种效益,是岷江上游干旱河谷保护和建设生态环境与发展区域经济的基本途径。岷江上游干旱河谷灌丛拥有十分特殊的古老植物区系和非常稀有的原始植被类型,在有限的地域内保存着古地中海植物区系的残遗成分和衍生后裔,在广阔的湿润森林地带的特定环境中生存着典型的冬旱灌丛,这些都是十分宝贵而稀有的自然遗产,对于研究我国西部的历史植物区系和自然地理,以及保护和建设现代生态环境和区域经济,都有着非常宝贵的科学价值和十分重要的现实意义。因此,特建议在岷江上游干旱河谷划出一定的面积建立自然保护区。保护地段可选设在杂谷脑河的甘堡至龙溪地区(包括主要支流的一部分河段)和岷江干流的飞虹桥至黑水河的沙坝(干旱中心)地区。

关键词：岷江上游干旱河谷植物区系植物群落冬旱灌丛草原灌丛关联网隐域植被自然保护区

Effects of land Use Change on Eco-environment in Hilly Area of Central sichuan Basin——A Case Study of Yanting County, sichuan {3.

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2003年第3B期8卷 981-986页

作者： Luo Huai-liang, Zhu Bo, Chen Guo-jie, Gao Mei-rongInstitute of Mountain Hazards and Environment, Chinese academy of Sciences, chengdu 610041, sichuan,{3. College of Resources and Environment, sichuan Normal University, chengdu 610066, sichuan,{3. Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 SichuanChina College of Resources and Environment Sichuan Normal University Chengdu 610066 Sichuan China Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 SichuanChina

With the artificial alder and cypress mixed forest being planted, there has been a marked land use change since 1970s' in Hilly Area of Central sichuan Basin, china. Data from meteorological observations or posts operated over long time, measurement and calculation of NPP (net primary production) and biomass of biological community, and analysis of soil organic matter content show that the artificial alder and cypress mixed forest has outstanding eco-environmental effect: adjusting local climate, raising soil fertility, alleviating menace of drought, and raising NPP and biomass of biological community. It is very beneficial for improving ecological environment to afforest artificial alder and cypress mixed forest in populous Hilly Area of Central sichuan Basin, china. Key Words: land use/land cover change (LUCC); eco-environmental effect; Hilly Area of Central sichuan Basin; the artificial alder and cypress mixed forest

关键词： of as for sichuan province Effects of land Use Change on Eco-environment in Hilly Area of Central sichuan Basin A Case Study of Yanting County on Eco

Research of New Campus Cultural Construction in New Period

在线全文

学校读者我要写书评

暂无评论

Research of New Campus Cultural Construction in New Period

2010 International Conference on Management Science and Engineering (MSE 2010)

作者： Pan An 1 College of land and Resources china West Normal University Nanchong city sichuan {3. 63.009 china 2 College of earth science chengdu university of technology chengdu city sichuan {3. 610000 china HU Li-Hui College of Computer Science china West Normal University Nanchong city sichuan {3. 63.009 china

Currently it is new campus cultural construction that important bottleneck of high education development become from quantity to quality in *** on the analysis characteristics and problems of new campus culture construction in the process of campus development,such as,blind pool in the construction of new campus culture,mainstream culture guided insufficiency,lack of tradition,etc and puts forward the problems of the new campus cultural construction,the new campus development should pay much attention to the new campus culture,teachers and students build in both,if played advantages of campus cultural heritage,innovation and dissemination,it will remain forever young and vibrant.

关键词： New Campus Campus Culture Inheriting Innovation

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

地震采集方法和储层预测技术的探讨

石油地球物理勘探 2003年第1期38卷 88-90页

作者：潘祖福四川石油管理局

本文针对四川盆地现行地震采集方法中存在的问题 ,寻求更有效、合理、经济的方法 ,以获得高质量、信息丰富的资料 ,用于构造研究和储层预测。实践证明 :以井下检波器接收 ,消除空间高频随机噪声替代地面检波器的线性和面积组合 ,可明显... 详细信息

本文针对四川盆地现行地震采集方法中存在的问题 ,寻求更有效、合理、经济的方法 ,以获得高质量、信息丰富的资料 ,用于构造研究和储层预测。实践证明 :以井下检波器接收 ,消除空间高频随机噪声替代地面检波器的线性和面积组合 ,可明显提高原始资料的信噪比、分辨率和保真度 ;对平缓以及不太复杂的构造 ,采取固定井下面积接收和移动激发的单次覆盖三维观测系统 ,可提高勘探构造的精度 ,用于预测裂缝发育带 ,并用频谱差曲线横向预测裂缝中的含油气性 ,以提高勘探成功率和效率 ;二维多次覆盖用于普查 ,获油气之后 ,用井下接收三维单次覆盖替代二维多次覆盖详查 ,可降低采集成本 ;用井下接收满覆盖次数的三维采集 ,勘探复杂的高陡构造的重点部位 ,可提高采集质量 ;经处理成自激、自收剖面后 ,可用于油气预测 ;用高分辨率的 VSP和微地震测井资料 ,编制频谱差曲线 ,用来预测目的层的最高频率和分辨率 ,从而确定是否进行高分辨率采集 ,达到合理使用装备的目的。采用以上方法可提高勘探成效 ,降低勘探成本 ,加快勘探进程。

关键词：地震采集方法储层预测井下接收频谱差曲线油气勘探

A family net of giant pandas in the Tangjiahe Natural Reserve:Assessment of current individual migration

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2005年第17期 65-72页

作者： WAN Qiuhong1, FANG Shengguo1, LI Jianguo2, ZHANG Liming 3. OU Weifu4, XIAN Fanghai4 & CHEN Wanli4 1. College of Life Sciences, State Conservation Center for Gene Re-sources of Endangered Wildlife, and Key Laboratory of Conservation Genetics and Reproductive Biology for Endangered Wild Animals of Ministry of Education, Zhejiang University, Hangzhou 3.0029, china 2. Forestry Department of sichuan province, {3. 610081, china 3. sichuan Bureau for Wildlife Resource Investigation, Conservation and Management, {3. 610082, china 4. Tangjiahe Natural Reserve, Qingchuan 628109, china

In the present study, formalin-fixed feces, oli-gonucleotide fingerprinting and SRY-gene based sexing were used to construct a family net for giant pandas in the Tang-jiahe Natural Reserve and to assess contemporary gene flow (migration) in this population. A total of 124 fecal samples were attributed to 3. individuals (22 females and 15 males) that were then analyzed for family relationships. Based on DNA fingerprints, the deduced family net revealed the fol-lowing facts: (i) First-order relatives possessed similarities from 50% to 90%, and similarities between unrelated indi-viduals or distant relatives were as high as 77%, indicating that the Tangjiahe pandas are characterized by high genetic similarity; (ii) 15 matings were identified and 5 ones oc-curred between close relatives, implying that there is poten-tial for inbreeding to impact the pandas; (iii) four mating pairs and 5 offspring presented long distance migrations, demonstrating the intra-reserve habitat is continuous; (iv) four pairs of full sibs (also female-male dyads) dispersed short distance and all of them gave birth to highly inbred offspring, reflecting long distance migration is vital for in-breeding avoidance; (v) 17 adult individuals dispersed short or moderate distance and formed three clusters on the land-scape, indicating that it is necessary to find out whether there is a negative factor impacting the pandas.

关键词： multilocus DNA fingerprinting giant panda family rela-tionship close inbreeding dispersal pattern.

Separate Analysis of Remote Sensing Information of Structures of Different Geological Periods and Quantitative Study of Corresponding Tectonic Stress Fields

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 1997年第3期71卷 344-354页

作者： Yang Wunian and Zhu Zhangsen Institute of Remote Sensing and GIS, chengdu University of Technology,chengdu, sichuan Liu Xinzhu Yang Wencai Institute of Remote Sensing and GIS Chengdu University of Technology Chengdu Sichuan [?]Yang Wunian Born in Zhongwei Ningxia province in 1954. He works as Director of the Institute of Remote Sensing & GIS of Chengdu University of Technology and a member of the Committee on Remote Sensing for Geology of the Geological Society of China. He is particularly interested in remote sensing geology and mathematic geology. His current major studies include applications of remote sensing techniques in exploration of land & resources.

The structural feature shown on a remote sensing image is a synthetic result ofcombination of the deformations produced during the entire geological history of an ***, the respective tectonic stress field of each of the different stages in the complexdeformation of an area can be reconstructed in three steps: (1) geological structures formed atdifferent times are distinguished in remote sensing image interpretation; (2) structuraldeformation fields at different stages are determined by analyzing relationships betweenmicrostructures (joints and fractures) and the related structures (folds and faults); and (3.tectonic stress fields at different stages are respectively recovered through a study of the featuresof structural deformation fields in different periods. Circular structures and related circlular and radial joints are correlated in space to con-cealed structural rises. The authors propose a new method for establishing a natural model ofthe concealed structural rises and calculating the tectonic stress field by using quantitative dataof the remote sensing information of circular structures and related linear structures.

关键词： separate analysis of the remote sensing information field circular structure linear structure stress field quantitative analysis 3.dimensional colour structural block diagram

The Feature of Segmentation Activity on the Northern Segment of the Anninghe Fault Zone Since Late Pleistocene

在线全文

学校读者我要写书评

暂无评论

Earthquake Research in china 1994年第4期8卷 134-142页

作者： Tang Rongchang,Qian Hong,Huang Zuzhi,Wen Dehua,Wu Xianguo,Cai Changxing and Tian Hong Seismological Bureau of sichuan province,chengdu 610041,{3.

Based on fault geometric features,composite pattern,faulting land-forms and seismic data,this paper discussed the activity behavior along the northern segment of the Anninghe fault(from Xichang to Shimian)since the Late *** fault can be divided into three active segments by discrepancies of their activity:the segment from Xichang to Mianning,the segment from Mianning to Zimakua,and the segment from Zimakua to *** southern segment has the background of occurrence of great earthquakes,but the middle and the northern segments can generate strong and moderate events *** to the features of quartz from fault gouges by scanning electron microscopy(SEM),this paper discussed the movement features along the fault and indicated the stick-slipping feature on the segment from Xichang to Zimakua,the creeping feature on the segment from Jiziping to Tianwan and the transitional feature on the segment in between.

关键词： Anninghe fault Faulting landform Most recently active surface fault Stick slipping Creeping

Study on landscape Pattern in the Jinshajiang Xerothermic Valley Using RS and GIS-Taking Yuanmou of Yunnan as an Example

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2003年第3B期8卷 957-964页

作者： He Jin-feng, Chen Guo-jie, Yang zhong, Su Chun-jiangInstitute of Mountain Hazards and Environment, Chinese academy of Sciences,chengdu 610041,sichuan,{3. Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 SichuanChina

Based on the data of landsat-TM in 1986 and 2000 and with the applied indices of landscape pattern, an analysis is carried out on the landscape pattern with its evolution in Yuanmou County of Yunnan {3. inside the Jinshajiang Xerothermic valley area and a forecast is given on the changing tendency of the landscape pattern in the county with Markov Chain Model. The result shows that the production landscape like irrigated farmland and construction land in town and country as well as ecological building landscape in boondocks were enlarged during 1986-2000. Also the patch shape was regularized and the patch shape index and dimensionality were degraded. The landscape pattern was tattered and the heterogeneity index and Evenness degree were increased but the dominance degree was degraded. The key elements with lower stability cover grassland. water body and bush land. The future transformation of landscape pattern will centralize in construction land's occupation in irrigated farmland, non-irrigated farmland and grassland, the transformation of non-irrigated farmland to irrigated farmland,forest and sparse wodland or orchard,construction land's occupation in grassland and cultivation of it into sloping non-irrigated farmland and forest's degeneracy to bush land, sparse woodland and grassland. The main measures to improve virtuous development of landscape in the xerothermic valley are suggested.

关键词： xerothermic valley landscape pattern Markov chain model