Effects of Land Use Change on Eco-environment in Hilly Area of Central Sichuan Basin——A Case Study of Yanting County, Sichuan Province

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

Aftershock of the Wenchuan Earthquake in Sichuan Triggers Large Earthquake in Minxian County, Gansu

Because of the confining compression of the Pacific, Eurasian and Indian plates, the Chinese mainland is frequently stricken with earthquakes, especially in the Qinghai Tibet Plateau and surrounding areas and along the NS-trending tectonic zone from Yinchuan to Lanzhou, Chengdu, and finally to the Kunming tectonic belt （Fig. 1）. Historical records show that there are 14 earthquakes of 〉Ms 8 occurring in the two regions, eight of which occurred along the latter tectonic belt. The 2008 Wenchuan earthquake located on both the NS tectonic zone and the Longmenshan fault zone along the eastern margin of the Qinghai-Tibet Plateau.

Study of Infection of Echinococcus granulosus in Yak in Spring and Its Potential Role in Transmission of Cystic Echinococcosis in Rangtang County of Sichuan,China

Dear Editor, Cystic echinococcosis （CE）, caused by Echinococcus granulosus in larval stage, is considered as one of the most dangerous parasitic zoonosis in the world. The obligate 2-host parasitic cycle of Echinococcus granulosus is predominantly synanthropic. Dogs are the usual definitive hosts, and lots of mammalian species can be intermediate hosts, including domestic livestock and human[I2]. In the Tibetan plateau, China, the population is mainly Tibetans primarily engaged in livestock husbandry and CE is therefore a health problem for both people and animal in Tibetan communities. The reported infection rate of Echinococcus gronulosus in slaughtered yak in slaughterhouses is usually very high, being about 50% or higher as reported, and the liver and lungs are the main affected organs[34].

Research of the Activity of Earthquakes Induced by Water Injection of Salt Mining in Changning County,Sichuan Province

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.

Stone Towers of Barkam County in Sichuan Province of China

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...

The Quantitative Analysis of Land Use Structure Characteristics of County in Mountainous Areas in Sichuan Province of China——A Case Study of Rong County

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.

A New Species of <i>Gentiana, Gentiana ciliolata</i>and It’s Two Subspecies of subsp. ciliolata and subsp. <i>longiloba</i>of Yunnan &Sichuan Provinces

A new species of Gentiana (Gentianaceae), Gentiana ciliolata is 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 Gentiana ciliolata subsp. ciliolata and Gentiana ciliolata subsp. longiloba respectively. The subsp. ciliolata idistributes on the right side of Jinsha River in Yiliang County, Yunnan Province and the subsp. longiloba distributes itself 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.

A Guide to the Open Cities(Counties,Cities and Districts)of Sichuan Province

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

基于县域乡村振兴视角的甘青川藏族聚居县返贫风险研究

文章旨在对甘青川藏族聚居县的返贫风险进行研究。样本数据和资料源于对甘青川藏族聚居县精准扶贫及脱贫工作的田野调查。通过调研甘青川三省藏族聚居县的脱贫攻坚工作,从中总结出一些具有地方特色的精准扶贫模式,如迭部县“特色产业模式”、泽库县“拉格日模式”、若尔盖县“跨地域协作模式”,发现在实践层面,甘青川藏族聚居县存在扶贫项目的立项随意性的问题、部分脱贫技能培训脱离实际的问题、易地搬迁扶贫模式带来的问题。文章通过返贫风险分析,针对巩固拓展脱贫攻坚成果与乡村振兴有效衔接的实现路径提出相关意见建议。

四川木里县项脚沟“7•5”特大型泥石流特征及发展趋势分析

2021年7月5日,凉山州木里县项脚沟暴发特大型泥石流灾害。文章通过野外调查和特征参数计算,研究了本次泥石流的形成条件、暴发过程和暴发特征。根据实地考察判断,泥石流主要在森林火灾、短时强降雨和沟道地形条件等因素共同作用下暴发,为暴雨径流冲刷引发的火后泥石流。暴雨形成的洪水冲刷坡面、侵蚀沟道,导致沟道两岸坍塌滑坡,堵溃效应明显,泥石流规模扩大。项脚沟过火面积达74.61%,高烈度火烧区面积达57.98%,泥石流临界降雨强度为77.84 mm/h,累计降雨达141.60 mm。根据泥石流特征参数计算结果,此次泥石流密度范围为1.83~1.93 g/cm^(3),属黏性泥石流,主沟下游出口流速为7.22 m/s,峰值流量759.08 m^(3)/s。结合雨洪法和形态调查法结果分析,此次泥石流重现周期为百年一遇。结合泥石流发育趋势,文章认为流域仍有可能暴发大型泥石流,提出了上游固坡、中游调控、下游排导的防治建议。

Sm-Nd dating and Nd-Sr isotopic characteristics of the Shimian ophiolite suiten,Sichuan Province

By mcasuring the Sm-Nd and Rb-Sr isotopiccompositions of harzburgite and gabbro from Shimianophiolite suite, we got the whole rock Sm-Nd isochron age of(938 ± 30) Ma (2σ), and the e Nd of 7.6 ± 0.8 (2σ), which showsthat the ophiolite was formed at the Early Neoproterozoic.The obvious change (0.70209-0.70708) of Isr values of theophiolite is caused by the meteoric hydrothermal alteration.The high εNd values indicate that the primitive magma wasderived from the intense depleted mantle rescrvoir. It is sug-gested that this area was in a back-arc basin environmentduring the Early Neoproterozic.

四川县域农业高质量发展水平测度及其自然-社会经济系统耦合

在农业高质量发展理论内涵分析基础上,从“自然环境”和“社会经济”两个维度构建农业高质量发展综合评价指标体系,并基于2000—2020年四川省183个县级行政单元的面板数据测度了各县域的农业高质量发展水平,探究了自然系统、社会经济系统和综合系统的时空演变规律。同时,改进管理学中的多要素权衡模型来计算自然-社会经济系统耦合协调程度,量化了农业高质量发展内部不同系统之间的耦合水平。研究结果表明:(1)四川省农业高质量发展综合指数先后经历了振荡期(2000—2011年)和迅速攀升期(2011—2020年),在此过程中,自然维度指数整体上比社会经济维度指数更高,但同时也表现出了更强的不稳定性;(2)农业高质量发展水平的高值区集中在成都平原及其周围丘陵区和川南少数区县,从两个高值中心向四周延伸,高质量水平逐渐下降,川西北高原农业高质量发展水平相较于广大平原和丘陵区域仍相对滞后;(3)在自然-社会经济系统间复杂的相互关系作用下,四川农业高质量发展实现了从低值不协调向低值协调,再到高值不协调的转变,不同时期的耦合不协调区域及其面临的农业高质量发展短板差异显著;(4)农业高质量发展的自然和社会经济指数之间存在复杂交错的相互作用关系,且这种关系在不同地貌类型间存在明显差异,在山地县表现得尤为突出。

韧性视角下川西山地城市国土空间规划策略——以四川省丹巴县为例

总结相关研究进展及国内外实践经验,提出韧性城市“生态观、全空间、全过程、全社会”4个规划转变,从系统韧性、空间韧性及机制韧性3个维度解析国土空间规划响应路径,即以系统韧性为思想统领、以空间韧性为核心载体、以机制韧性为实施保障。以川西山地城市——丹巴县为例,将人与自然生命共同体的价值导向融入国土空间总体规划编制全过程,精准识别灾害风险,明晰韧性城市底图底数;明确韧性城市总体定位,制定空间策略;优化国土空间布局,筑牢“安全底线、安全底板、设施支撑”三重防线,即严守安全底线及资源利用上限、基于自然优化国土空间格局及布局、构筑城乡一体的防灾生活圈及多维交通;提出“多管合一”、全民防灾的建议,建立“纵横联动”的规划传导机制,以锚固安全国土空间。

四川省县域经济增长数量与质量耦合协调的时空演变与机制

以四川省183个县域为基本研究单元,构建县域经济增长数量与质量耦合协调评价指标体系,运用熵值法、耦合协调模型、地理探测器等方法,对2006、2010、2016、2020年四川省县域经济增长数量和质量综合水平、时空耦合关系及影响因素进行探究,结果表明:1)经济增长数量水平先大幅提升后略有下降,保持“东高西低”的空间格局;经济增长质量水平整体呈上升趋势且县域差异先增大后略微减小,呈现多样性分布特征;2)耦合协调水平呈持续上升态势,总体上实现由濒临失调向基本协调过渡,2006—2010年呈现“中部南部凸起,外围塌陷”的空间格局;2016—2020年基本协调县域由成都市向外围地区加速扩散直至基本遍布全省;3)耦合协调类型整体上逐步由质量滞后向相对协调转变,数量滞后型和质量滞后型县域数量变化趋势呈“六边形”对称分布,相对协调型县域数量先略微下滑后平稳增长;4)人均GDP、民生福祉、经济发展潜力、经济开放性对耦合协调水平提升有显著影响.

川西红层地区泥石流特征研究——以德昌县群英村王家坡沟为例

2022年8月23日德昌县乐跃镇群英村王家坡沟暴发群发性泥石流灾害,导致群英村至太平村的乡道严重堵塞,乡道两侧的耕地及经济作物大面积受毁。为揭示此次群发性泥石流的发育规律,本文结合实地调查和遥感影像对王家坡泥石流的形成机制、动力学特征进行综合研究。研究结果表明:此次泥石流在短历时强降雨情况下,坡面入渗迅速形成地表径流聚集于沟道,水流沿程掏蚀、侧蚀沟道岸坡形成大量的沟道松散固体物质,泥石流规模呈放大趋势冲出沟口形成泥石流灾害。该泥石流沟松散堆积物动储量为1.21×10^(4)m^(3),主要分为沟道物源、崩滑物源、侵蚀物源3种物源类型,其中沟道物源占比最大;最后计算了不同暴雨频率条件下泥石流的流量以及冲击力,为王家坡泥石流灾害防治提供可靠的数据和相应的防治措施。

四川雷波竹类资源及其开发利用建议

四川省雷波县气候条件优越,竹类资源丰富,但其开发利用严重滞后,制约着竹产业发展。为发挥竹资源优势,推动竹产业发展,文章利用文献研究结合野外调查,整理分析了雷波县竹类植物资源及其利用现状,并提出竹资源开发利用的建议。雷波县共有竹类植物12属36种1变种4变型,共41种,现有竹资源面积83830.02 hm^(2),其中主要为筇竹和箭竹,面积分别占总面积的36.86%和36.72%。雷波县竹产业发展相对落后,竹资源开发面临着基础设施落后、资源破坏严重、缺乏精深加工等诸多问题。加快竹产业发展,应着重加强资源保护、发展笋材竹林、培育壮大龙头企业、促进三产融合发展。

四川道孚容须卡稀有金属矿区土壤地球化学特征及找矿预测

通过对四川省道孚县容须卡稀有金属矿区开展1∶1万土壤地球化学测量工作,采集土壤样品8861件,分析16种元素含量,进行地球化学参数统计、相关性分析、聚类分析、因子分析,研究元素地球化学分布特征、单元素地球化学异常特征、组合元素地球化学异常特征。结果显示矿区内稀有金属元素富集规律明显,出现Li-Be-Cs-Sn和Nb-Ta两组异常,异常叠合较好。Li-Be-Cs-Sn异常主要分布于矿区中部、北东部及西部,Nb-Ta异常主要分布于矿区北部及北东部,与矿区内伟晶岩脉集中分布范围吻合。结合矿区地层、构造及岩浆岩特征,圈定出5个稀有金属矿找矿靶区,经地质填图、槽探及钻探工程验证,新发现了42条具有锂、铍、铌、钽、铷矿化的伟晶岩脉,圈定出12条锂矿体,表明土壤地球化学测量在四川道孚容须卡稀有金属矿勘查中具有较好的应用效果。

第二次国共内战时期国统区县级财政改革及运行困境——以四川省县税捐稽征处为中心的考察

抗战胜利后,国民政府重新调整中央地方财政关系,强化县级财政能力,对县级税征机构进行了一系列调整,特别是在1947年改组税捐征收处为税捐稽征处,增强税捐稽征的专业性,试图对各类税捐实行自征;同时还裁汰部分税务人员,以缩减地方开支,但县级财政改革并未达到既定目标,在国统区的四川,反而因税征体系的调整使县税征税环境进一步恶化。战时状态下央地财权与事权分配的失衡和县级财政制度设计的缺陷是国民政府县级财政改革失败的主要原因。

四川金堂地区4733例孕妇地中海贫血基因检测结果分析

目的探讨四川金堂地区孕妇地中海贫血(以下简称“地贫”)基因携带类型及频率分布,为金堂地区地贫防控体系构建提供参考数据。方法对2018年4月至2023年6月首次来该院进行常规产检的4733例孕妇进行中国人常见的23型地贫基因检测,对疑似罕见型地贫标本送至广州凯普医药科技有限公司进行检测。结果确诊地贫基因携带者782例,金堂地区孕妇地贫总携带率为16.52%,其中检出α-地贫487例,占总携带数的62.21%,基因型以αα/-αSEA型、αα/-α^(3.7)型、αα/-α^(4.2)型、α^(CS)α型、α^(WS)α型为主;检出β-地贫278例,占总携带率的35.58%,基因型以CD17M/N、CD41-42M/N、IVS-Ⅱ-654M/N、CD71-72M/N、βEM/N为主,其中还包含的3例罕见型地贫;检出复合型地贫17例,占总携带数的2.21%。结论金堂地区孕妇地贫阳性率较高,类型复杂多样;α-地贫患者高于β-地贫患者,分布存在一定的地域特征,α-地贫多见于αα/-αSEA、αα/-α^(3.7)、αα/-α^(4.2);β-地贫多见于CD17M/N、CD41-42M/N、IVS-Ⅱ-654M/N。