Barkam County,where the Aba Tibetan & Qiang Autonomous Pre-fecture government lies,is located on the intersection of South eastern of Qinghai-Tibet Plateau,Northwestern of Sichuan Basin and central Aba.Occupying 6...Barkam County,where the Aba Tibetan & Qiang Autonomous Pre-fecture government lies,is located on the intersection of South eastern of Qinghai-Tibet Plateau,Northwestern of Sichuan Basin and central Aba.Occupying 6,633 square kilometer,Barkam County boasts a time-honored history dating back to the Neolithic Age.Relics in Haxiu and Konglong reveal Barkam County to be an ethnic group settlement.All 15 ethnic groups,including Qiang,Hui,Han,among others,live in har-mony in Barkam now.Barkam has a population o...展开更多
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 ...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展开更多
Based on the data concerning detailed survey on land in the year 2009 and land change in the year 2010 in Rong County,a mountainous region of Sichuan Province,by using quantitative geographical model,we conduct quanti...Based on the data concerning detailed survey on land in the year 2009 and land change in the year 2010 in Rong County,a mountainous region of Sichuan Province,by using quantitative geographical model,we conduct quantitative analysis of the status quo of land use in Rong County in terms of land use diversification,land use centralization,land use combination type,land use geographic significance and comprehensive use degree of land use.The results show some characteristics as follows.Firstly,land use in study area displays prominent characteristic of diversification;there is a high degree of completeness land use type;there is a great similarity among towns.Secondly,there is limited combination number of land use type;mostly the combination number of the towns is 2-3;the holistic function of regional land is fragile;the proportion of farmland areas is big,reaching 40.09%;the land use type of 21 towns is farmland.Thirdly,the towns with prominent characteristic of diversification of land use in Rong County,have low degree of centralization of land use and relatively big combination number of land use type,and vice versa.Fourthly,the type and quantity of agricultural land resources with geographical significance are relatively complete with nothing missing;it abounds in untapped land,but the overall index values of land use are all smaller than 300,with low overall use degree of land.展开更多
According to information from on-the-spot investigations, the tectonics of salt mining areas and digital seismic records, we studied the activity of earthquakes induced by water pumping in and out of the salt mines in...According to information from on-the-spot investigations, the tectonics of salt mining areas and digital seismic records, we studied the activity of earthquakes induced by water pumping in and out of the salt mines in Shuanghe town, Changning county, Sichuan Province. The study found that the rates of water injection and extraction in the Shuanghe salt mining region were evenly matched before April 2006 and earthquake activity was stable. On the other hand, shallow small and moderate earthquake numbers increased sharply after the water injection rate became much larger than the water extraction rate. Large injection over a long time may causes the permeation of water through pre-existing small fractures and micro-cracks in the Changning anticlinal and accelerate the rupture of micro tectonic formations in nearby regions, inducing small earthquake swarm activity. The Q value calculated by using digital earthquake records indicates a relatively inhomogeneous medium in this area. The results of the accurate location of small earthquakes show that sources are relatively shallow and are concentrated at a depth of 2km to 3km. Focal mechanism solutions reveal a normal dip-slip character of shallow earthquakes. All of these show certain characteristics of earthquake activity induced by water injection.展开更多
A new species of </span><i><span style="font-family:Verdana;">Gentiana</span></i><span style="font-family:Verdana;"> (</span><i><span style="...A new species of </span><i><span style="font-family:Verdana;">Gentiana</span></i><span style="font-family:Verdana;"> (</span><i><span style="font-family:Verdana;">Gentianaceae</span></i><span style="font-family:Verdana;">), </span><i><span style="font-family:Verdana;">Gentiana</span></i> <i><span style="font-family:Verdana;">ciliolata</span></i> <span style="font-family:Verdana;">is</span><span style="font-family:Verdana;"> described and illustrated;it has a spectacular characteristics of calyx lobe ciliolate, distributed in Yunnan and Sichuan Provinces on the two sides of Jinsha River, and then two subspecies have been further re-classified as </span><i><span style="font-family:Verdana;">Gentiana</span></i> <i><span style="font-family:Verdana;">ciliolata</span></i> <span style="font-family:Verdana;">subsp</span><i><span style="font-family:Verdana;">.</span></i> <i><span style="font-family:Verdana;">ciliolata</span></i> <span style="font-family:Verdana;">and </span><i><span style="font-family:Verdana;">Gentiana</span></i> <i><span style="font-family:Verdana;">ciliolata</span></i> <span style="font-family:Verdana;">subsp.</span> <i><span style="font-family:Verdana;">longiloba</span></i> <span style="font-family:Verdana;">respectively</span><i><span style="font-family:Verdana;">.</span></i> <span style="font-family:Verdana;">The subsp.</span> <i><span style="font-family:Verdana;">ciliolata</span></i><span style="font-family:Verdana;"> idistributes</span> <span style="font-family:Verdana;">on the right side of Jinsha River in Yiliang County, Yunnan Province and the subsp</span><i><span style="font-family:Verdana;">.</span></i> <i><span style="font-family:Verdana;">longiloba</span></i><span style="font-family:Verdana;"> distributes itself </span><span style="font-family:Verdana;">on the southwest and west part of Sichuan Province, such as Leibo County, Wenchuan County and Mabian Yi Autonomous Prefacture, in the grassland under forests and moist rock slopes at an altitude of 1300 - 3200 m.展开更多
文摘Barkam County,where the Aba Tibetan & Qiang Autonomous Pre-fecture government lies,is located on the intersection of South eastern of Qinghai-Tibet Plateau,Northwestern of Sichuan Basin and central Aba.Occupying 6,633 square kilometer,Barkam County boasts a time-honored history dating back to the Neolithic Age.Relics in Haxiu and Konglong reveal Barkam County to be an ethnic group settlement.All 15 ethnic groups,including Qiang,Hui,Han,among others,live in har-mony in Barkam now.Barkam has a population o...
基金Supported by the Knowledge Innovation Program of Chinese Academy of Sciences(KZCX1-SW-01-01B)Cultivatlon Foundation of Institute of Mountain Hazards and Environment,CAS
文摘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
基金Supported by National Technology Support Program (2006BAJ05A13)National Technology Support Program (2007BAD89B15 )Technology Support Program of Sichuan Province (2009NZ0051)
文摘Based on the data concerning detailed survey on land in the year 2009 and land change in the year 2010 in Rong County,a mountainous region of Sichuan Province,by using quantitative geographical model,we conduct quantitative analysis of the status quo of land use in Rong County in terms of land use diversification,land use centralization,land use combination type,land use geographic significance and comprehensive use degree of land use.The results show some characteristics as follows.Firstly,land use in study area displays prominent characteristic of diversification;there is a high degree of completeness land use type;there is a great similarity among towns.Secondly,there is limited combination number of land use type;mostly the combination number of the towns is 2-3;the holistic function of regional land is fragile;the proportion of farmland areas is big,reaching 40.09%;the land use type of 21 towns is farmland.Thirdly,the towns with prominent characteristic of diversification of land use in Rong County,have low degree of centralization of land use and relatively big combination number of land use type,and vice versa.Fourthly,the type and quantity of agricultural land resources with geographical significance are relatively complete with nothing missing;it abounds in untapped land,but the overall index values of land use are all smaller than 300,with low overall use degree of land.
文摘Administrative divisions: ChengduMunicipality:Qingyang District, Jinjiang District,Wuhou District, Chenghua District, JinniuDistrict, Longquanyi District, QingbaijiangDistrict, Jintang County, Shuangliu County,Wenjiang County, Chongzhou City, XinduCounty, Dujiangyan City, Qionglai City,Pixian County, Pujiang County, XinjingCounty, Dayi County, Pengzhou
基金Key Project in the National Science and Technology Pillar Program in the Eleventh"Five-year Plan" Period (2006BA01B02-01-01)Project in the National Science and Technology Pillar Program(2006BAC01B04),China
文摘According to information from on-the-spot investigations, the tectonics of salt mining areas and digital seismic records, we studied the activity of earthquakes induced by water pumping in and out of the salt mines in Shuanghe town, Changning county, Sichuan Province. The study found that the rates of water injection and extraction in the Shuanghe salt mining region were evenly matched before April 2006 and earthquake activity was stable. On the other hand, shallow small and moderate earthquake numbers increased sharply after the water injection rate became much larger than the water extraction rate. Large injection over a long time may causes the permeation of water through pre-existing small fractures and micro-cracks in the Changning anticlinal and accelerate the rupture of micro tectonic formations in nearby regions, inducing small earthquake swarm activity. The Q value calculated by using digital earthquake records indicates a relatively inhomogeneous medium in this area. The results of the accurate location of small earthquakes show that sources are relatively shallow and are concentrated at a depth of 2km to 3km. Focal mechanism solutions reveal a normal dip-slip character of shallow earthquakes. All of these show certain characteristics of earthquake activity induced by water injection.
文摘A new species of </span><i><span style="font-family:Verdana;">Gentiana</span></i><span style="font-family:Verdana;"> (</span><i><span style="font-family:Verdana;">Gentianaceae</span></i><span style="font-family:Verdana;">), </span><i><span style="font-family:Verdana;">Gentiana</span></i> <i><span style="font-family:Verdana;">ciliolata</span></i> <span style="font-family:Verdana;">is</span><span style="font-family:Verdana;"> described and illustrated;it has a spectacular characteristics of calyx lobe ciliolate, distributed in Yunnan and Sichuan Provinces on the two sides of Jinsha River, and then two subspecies have been further re-classified as </span><i><span style="font-family:Verdana;">Gentiana</span></i> <i><span style="font-family:Verdana;">ciliolata</span></i> <span style="font-family:Verdana;">subsp</span><i><span style="font-family:Verdana;">.</span></i> <i><span style="font-family:Verdana;">ciliolata</span></i> <span style="font-family:Verdana;">and </span><i><span style="font-family:Verdana;">Gentiana</span></i> <i><span style="font-family:Verdana;">ciliolata</span></i> <span style="font-family:Verdana;">subsp.</span> <i><span style="font-family:Verdana;">longiloba</span></i> <span style="font-family:Verdana;">respectively</span><i><span style="font-family:Verdana;">.</span></i> <span style="font-family:Verdana;">The subsp.</span> <i><span style="font-family:Verdana;">ciliolata</span></i><span style="font-family:Verdana;"> idistributes</span> <span style="font-family:Verdana;">on the right side of Jinsha River in Yiliang County, Yunnan Province and the subsp</span><i><span style="font-family:Verdana;">.</span></i> <i><span style="font-family:Verdana;">longiloba</span></i><span style="font-family:Verdana;"> distributes itself </span><span style="font-family:Verdana;">on the southwest and west part of Sichuan Province, such as Leibo County, Wenchuan County and Mabian Yi Autonomous Prefacture, in the grassland under forests and moist rock slopes at an altitude of 1300 - 3200 m.