检索结果-南通市图书馆

水土保持学报 1999年第S1期11卷 39-45页

作者：周麟中国科学院水利部成都山地灾害与环境研究所成都610041

简要回顾了泥石流生物工程理论研究及防治历史；在此基础上，概括了泥石流生物工程及相关领域生物工程理论１０多年的新发展；最后，提出了我国泥石流生物工程研究今后亟待解决的问题。

关键词：泥石流生物工程新进展展望

Rural Public Investment and Benefit in sichuan's Hilly and mountainous Areas

在线全文

学校读者我要写书评

暂无评论

Asian Agricultural Research 2012年第8期4卷 28-32页

作者： ZHANG Hai-qin 1,3 ,LIU Shao-quan 1 ,LUO Ren-fu 2.,ZHANG Lin-xiu 2.1. institute of mountain {2. and environment,chinese academy of sciences,chengdu 610041,China 2. institute of Geographic sciences and Natural Resources Research,chinese academy of sciences,Beijing 100101,China 3. Graduate University of chinese academy of sciences,Beijing 100049,China

Using representative sampling survey data,we take the case of roads,domestic water,irrigation facilities,clinics and schools,to give an overview of the status quo of rural public investment in sichuan's hilly and mountainous areas in the period 2.05 -2.08; conduct comprehensive analysis of public investment benefit,from the status quo of supply and demand,social benefit and villagers' satisfaction. The results show that the social benefit arising from the construction of road projects is good,while the social benefit arising from the construction of irrigation facilities is poor; the matching effect of supply and demand of public investment is poor,especially for the investment in irrigation facilities; on the whole,villagers' satisfaction with public investment has been promoted,but most of the villagers are still unsatisfied with the current irrigation facilities. The major capital source of rural public investment is from the government,but from the perspective of the villagers' demand,we should further increase the public financial input.

关键词： Rural public investment Social benefit index Evalu

Study on the Spreading of environmental Impact of Human Being' s Activities and Its Crucial Factors in Upper Minjiang River

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural sciences 2003年第S2期 949-956页

作者： Fan Hong, Zhao Hong-da College of Resources and environment, Lanzhou University, Lanzhou 730000, Gansu, China institute of {2. hazards and environment, chinese academy of sciences, chengdu 610041, sichuan, China

This paper focuses on the historical transition of human being's activities and the eco-environment in the upper reaches of Minjiang River. The history is divided into 4 periods, each with its own feature. During the period of nomad immigration, the top-line of the subalpine forest was forced downward by the expanding subalpine meadow. During the period of farming nationality immigration, the bottom-line of middle mountain forest had moved upward forced by the needs for land or timber of the increasing population in the valley basia During the period of the early exploiting, the focus resource was the timber. The total output was limited, comparing with the later period, because of the bad accessibility. But it was large enough to impact the forest ecosystem of the deforesting area. The recent 50 years is the crucial period of economic development and eco-environment degradation. This paper points out that the impact of human being's activities for environment lies on 3 factors: 1) physical features con

关键词： historical period human being’s activities environmental impact crucial factors

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

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 957-964页

作者： He Jin-feng, Chen Guo-jie, Yang zhong, Su Chun-jianginstitute of mountain {2. and environment, chinese academy of sciences,chengdu 610041,sichuan,China institute of mountain {2. and environment Chinese Academy of Sciences Chengdu 610041 SichuanChina

Based on the data of Landsat-TM in 1986 and 2.00 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 Province 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 1986-2.00. 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

Astronomical function and date of the Taosi observatory

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2009年第1期52卷 151-158页

作者： WU JiaBi1, CHEN MeiDong2.& LIU CiYuan3 1 National Astronomical Observatories, chinese academy of sciences, Beijing 100012. China 2.institute for the History of Natural Science, chinese academy of sciences, Beijing 100010, China 3 National Time Service Center, chinese academy of sciences, Xi’an 710600, China 1. National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China 2. institute for the History of Natural Science Chinese Academy of Sciences Beijing 100010 China 3. National Time Service Center Chinese Academy of Sciences Xi’an 710600 China

The Taosi site in Xiangfen County,Shanxi Province,may be the capital of the King Yao. Archeologists recently discovered a large semi-circular stamped-earth platform, II FJT1,which has a clear and definite pounded-earth central core together with a curved wall perforated by twelve gaps. The platform is said to be an ancient observatory used to determine the seasons by watching the sunrise. Each feature of II FJT1 was precisely measured and the data are reproduced in this paper. An astronomical analysis of slots E2.and E12.was carried out using the azimuths of the slots' centerlines and the vertical angle of the mountain ridge opposite, above which the sun rises. The results show that at present the sun is close to the two slots but does not exactly enter them at summer and winter solstice sunrise. Using 14C analysis archeologists dated the site to about 2.00 BC. Because of the secular change in the obliquity of the ecliptic,at that date on the summer solstice the half-risen sun would have appeared inside slot E12.just to the right of the centerline,and on the winter solstice the sun would have been exactly on the centerline of slot E2. This result provides compelling proof that II FJT1 is an ancient observatory.

关键词： astro-archeology astro-chronology Taosi culture ancient observatory time service

在线全文

学校读者我要写书评

暂无评论

中国山地范围界定的初步意见

山地学报 2008年第2期26卷 129-136页

作者：江晓波中国科学院水利部成都山地灾害与环境研究所中国科学院山地灾害与地表过程重点实验室四川成都610041

中国山地的范围一直缺乏可操作的、准确的量化方法,从而导致对山地及其内部资源、环境、人口和发展问题认识的不全面。同时,准确界定山地范围是实施数字山地战略的一项基础性工作。在前人研究的基础上,采用两种方案确定中国山地范围。... 详细信息

中国山地的范围一直缺乏可操作的、准确的量化方法,从而导致对山地及其内部资源、环境、人口和发展问题认识的不全面。同时,准确界定山地范围是实施数字山地战略的一项基础性工作。在前人研究的基础上,采用两种方案确定中国山地范围。方案一:将满足以下两种情况的国土界定为山地,1)海拔≥3000m;2.海拔≥300～3000m,同时相对高差>2.0m或坡度>2.°。根据此标准计算,中国山地面积为40002.5km2.占中国陆地面积的41.67%。方案二:根据UNEP-WCMC的标准,将满足下述情况的国土定义为山地,1)海拔≥2.00m;2.海拔≥1500～2.00m,坡度≥2.;3)海拔≥1000～1500m,坡度≥5°或相对高差≥300m;4)海拔≥300～1000m,相对高差≥300m。根据此标准计算,中国山地面积为442.130km2.占中国陆地面积的46.11%。按两种方法计算所得的分省山地面积中,前5名都是西藏、青海、新疆、四川和云南。将两种方案计算的山地面积按高程划分为六级:①300～1000m(含300m),②1000～1500m(含1000m),③1500～2.00m(含1500m),④2.00～3500m(含2.00m),⑤3500～4500m(含3500m),⑥≥4500m。根据两种方案的定义,海拔3500m以上的山地面积相等;除了方案一在300～1000m间山地较方案二多32.508km2.,其余几个级别山地的面积均为方案二大于方案一的山地面积,其中2.00～3500m间多133432.m2.1500～2.00m间多336186km2.1000～1500m间多2.2.73km2.

关键词：山地范围定义数字山地中国

Community Structure and Seasonal Variation of Soil Arthropods in the Forest-Steppe Ecotone of the mountainous Region in Northern Hebei,China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of mountain Science 2010年第2期7卷 187-196页

作者： ZHU Xinyu GAO Baojia YUAN Shengliang HU Yunchuan institute of mountain {2. and environment CAS Chengdu 610041 China Graduate University of the chinese academy of sciences Beijing 100039 China Hebei North University Zhangjiakou 075000 China Agricultural University ofHebei Baoding 071000 China

Soil fauna have been receiving more and more attention because they play an important role in nutrient ***,there is a lack of information on soil arthropods in the forest-steppe ecotone in the mountainous region of northern Hebei,which makes it difficult to meet the need of protecting biodiversity in this *** arthropod communities were investigated in the forest-steppe ecotone in northern Hebei province to provide basic information on changes in mountain soil fertility,which could promote the development of soil arthropod communities in mountain *** the preliminary identification,a total of 7994 individual soil arthropods were collected,which belonged to 2. groups,6 classes and 2. ***,Hymenoptera and Collembola were the dominant groups in the *** number of Acarina was higher than Collembola,and this phenomenon was obviously different from other areas in the same climate *** increased abundance of rare groups in the Forest zone with the richer vegetation,higher arthropod abundance and more substantial litter depth,could be interpreted as a reaction to the suitable soil environment and food *** these rare groups were sensitive to environmental changes,which could be regarded as biotic indicators for evaluating soil *** analysis of community diversity showed that the abundance index (d),the Shannon-Wiener index (H'),the evenness index (J) and the density-group index (DG) were significantly higher in the forest zone,lower in the forest-steppe zone,and lowest in the meadow-steppe *** variations in community composition correlated with changes in average air temperature and precipitation in this *** and individuals of soil arthropod communities in the three zones were present in greater numbers in the middle of the rainy season than in the early or late periods of the rainy season as a *** the same time,seasonal changes in soil arthropod communities from different plots were also

关键词： Soil arthropods Diversity Composition Ecotone Seasonal change

A Remote Sensing-based Analysis on the Impact of Wenchuan Earthquake on the Core Value of World Nature Heritage sichuan Giant Panda Sanctuary

在线全文

学校读者我要写书评

暂无评论

Journal of mountain Science 2011年第3期8卷 458-465页

作者： YU Hu ZHAO Yongtao MA Yuewei SUN Yulian ZHANG Hu YANG Shihong LUO Yong institute of mountain {2. and environment ChineseAcademy of Sciences No. 9. Section 4. South Renmin Road China Graduate University of chinese academy of sciences Beijing 100049 China sichuan World Heritage Administrative Office

In this study,we used remotely sensed data,GIS modeling,and statistical methods to evaluate the damage caused by the Wenchuan Earthquake (May 12.2.08) to the giant panda (Ailuropoda melanoleuca) habitat in the World Nature Heritage sichuan Giant Panda Sanctuary (WHSGPS) in China.A landscape ecological analysis found increases of landscape heterogeneity,complexity,and fragmentation in the giant panda habitat after the earthquake.A terrain analysis found that slope and elevation are directly associated with the distribution of the damaged *** slope and elevation increase,the size of the damaged area keeps increase until to a peak,and then starts to *** total area of the damaged vegetation in our study area is 114.2. km 2.accounting for 3.78% of the study area;30.46% of that 114.2. km 2.is located in the Core Zone of *** are 18.57km 2.of the damaged vegetation located in the identified suitable giant panda habitat,accounting for 1.75% of the total area of suitable giant panda habitats in the study *** on these findings,we conclude that the Wenchuan Earthquake does not have significant impact on the WHSGPS as a whole.

关键词： World Nature Heritage Giant Panda Sanetuaries Suitable giant panda habitat Model Wenehuan Earthquake Landscape pattern GIS RS

PRE-WARNING OF THE UPLAND ECOSYSTEM IN THE THREE-GORGE RESERVOIR AREA

在线全文

学校读者我要写书评

暂无评论

Natural Disaster Reduction in China 2002年第4期 30-36页

作者： Liu Shaoquan, Chen Guojie and Chen Zhijian (chengdu institute of {2.ous Region hazards & environment, chinese academy of sciences & Ministry of Water Resources, chengdu 610041, sichuan, China)

The characters of the upland ecosystem in the Three Gorge Reservoir (TGR) area are presented. An index system and the mathematical models for pre warning of the upland ecosystem are proposed. A pre warning analysis is made on the presumption that no major investment will be made to control and restore the upland ecosystem in the TGR area, and the conclusion is reached that the complex ecosystem and all its subsystems will be in a state of reverse evolution, and the majority of them will be in a warning status by 2.10. Based on the analysis, an outline of strategies for optimum control of the situation is given, and the essential strategy is to keep a balance between socio economic development and eco environment rehabilitation.

关键词： the Three Gorge Reservoir area upland ecosystem pre warning

在线全文

学校读者我要写书评

暂无评论

泥石流沟床比降的几点讨论

水土保持学报 1999年第S1期11卷 51-55页

作者：李泳中国科学院成都山地灾害与环境研究所成都610041

沟床比降是影响泥石流发生和运动的基本参数，但通常在水力学和工程学中应用的比降计算公式在形式上是不确定的，也没有直观的几何意义。以积分形式重新定义比降发现影响泥石流运动的应是有效比降，它的改变在泥石流的发生和运动中起着... 详细信息

沟床比降是影响泥石流发生和运动的基本参数，但通常在水力学和工程学中应用的比降计算公式在形式上是不确定的，也没有直观的几何意义。以积分形式重新定义比降发现影响泥石流运动的应是有效比降，它的改变在泥石流的发生和运动中起着重要作用，泥石流的阵性特征可能是这种作用的一个表现；最后讨论了由比降参数γ决定的泥石流速度估算公式γ的分布将是一个有趣的问题。

关键词：泥石流比降势能速度估算