云南省旅游资源与生态安全协调发展的时空演化特征及障碍因子分析   总被引：1，自引：0，他引：1  

赵书虹  白梦  阮梦枝  钱海燕 《地理科学》2021,41(3):493-503

自然、经济和社会构成的复合生态系统为旅游资源的赋存和开发提供条件,而丰富的旅游资源不仅能够促进旅游业发展,也为推动社会经济发展和自然环境保护提供了重要力量。运用线性加权法、耦合协调度模型和趋势分析等方法探究了云南省16个州市旅游资源与生态安全耦合协调发展现状及其障碍因子,研究发现：① 尽管云南87.50%的州市旅游资源与生态安全处于中度耦合协调发展阶段,两系统具有明显的耦合互动关系,但整体耦合协调发展趋于稳定,且呈现以昆明市为核心的“核心?边缘”结构,耦合协调发展水平仍需增强,空间分布格局有待完善。② 从局部演化特征来看,除滇中和滇东南旅游区,其余四大旅游区耦合协调度空间差异逐渐缩小,旅游业发展具有一定的“扩散效应”。③ 50%的州市旅游资源障碍度具有“组合度>品位度>类型>丰度”的特征,而生态安全障碍度层面,旅游发展和生态环境质量不高,旅游业和社会经济发展驱动力不足,生态安全响应机制不健全是影响两者耦合协调发展的主要因素。  相似文献   

城乡过渡带空间演进与空间交互强度分析     

林妙萍  陈颖彪  千庆兰  杨智威  阮杰儿 《热带地理》2021,41(2):315-326

采用NPP/VIIRS夜间灯光数据提取广州市城乡过渡带边界,利用基于sDNA模型修正的引力模型测算2012—2019年广州市城乡过渡带的空间交互强度,分析其空间演进特征与社会经济发展的关系。研究表明：1）2012—2019年广州市城乡过渡带总体呈扩大趋势,以北偏东方向发展为主,破碎区块逐渐演变为连续区域;2）广州市城乡过渡带之间的空间交互网络结构呈现“多方向化”趋势,从最初的西南侧单线网络结构逐步发育成多方向闭合网络联结结构,目前演变为南北两支、东西向的强空间交互态势,以白云区为代表的北部区域和以番禺区为代表的南部区域是广州市城乡过渡带的重要战略节点地域;3）广州市城乡过渡带社会经济优势度呈现出由内向外的3个空间层级结构,并由城市核心区辐射带动,向北、东北与东南3个方向推动发展为城乡过渡带;4）各城乡过渡带的发展速度不均衡现象仍较明显,广州市应结合本区域优势产业和自然资源,走联合与互补发展并存的道路,重视城乡过渡带区域发展引擎,增强其与周边地区联系的潜力。  相似文献   

Comparative analysis of different underlying surfaces using a high-resolution assimilation dataset in semi-arid areas in China     

Jinshuai?Ruan  Xiaohang?WenEmail author  Guangzhou?Fan  Deqin?Li  Wei?Hua  Bingyun?Wang  Yi?Zhang  Mingjun?Zhang  Chao?Wang  Lei?Wang 《Theoretical and Applied Climatology》2018,134(3-4):817-828

To study the land surface and atmospheric meteorological characteristics of non-uniform underlying surfaces in the semi-arid area of Northeast China, we use a “High-Resolution Assimilation Dataset of the water-energy cycle in China (HRADC)”. The grid points of three different underlying surfaces were selected, and their meteorological elements were averaged for each type (i.e., mixed forest, grassland, and cropland). For 2009, we compared and analyzed the different components of leaf area index (LAI), soil temperature and moisture, surface albedo, precipitation, and surface energy for various underlying surfaces in Northeast China. The results indicated that the LAI of mixed forest and cropland during the summer is greater than 5 m² m^?2 and below 2.5 m² m^?2 for grassland; in the winter and spring seasons, the Green Vegetation Fraction (GVF) is below 30%. The soil temperature and moisture both vary greatly. Throughout the year, the mixed forest is dominated by latent heat evaporation; in grasslands and croplands, the sensible heat flux and the latent heat flux are approximately equal, and the GVF contributed more to latent heat flux than sensible heat flux in the summer. This study compares meteorological characteristics between three different underlying surfaces of the semi-arid area of Northeast China and makes up for the insufficiency of purely using observations for the study. This research is important for understanding the water-energy cycle and transport in the semi-arid area.  相似文献   

福州平安大厦深基坑支护设计与施工          下载免费PDF全文

阮广招  黄金灿 《探矿工程》1999,(4):14-15,21

深基坑支护设计与施工是当前城市高层、超高层建筑突显的技术难题。通过工程实例,从设计方案的选择到施工、监测,提供了有益的经验。  相似文献   

淀山湖水环境质量评价及污染防治研究   总被引：20，自引：6，他引：14  

阮仁良  王云 《湖泊科学》1993,5(2):153-158

从淀山湖环境研究入手。全面考察湖区点源和非点源污染物的分布及其对湖泊的输入,分析湖内污染物的动态变化,采用模糊矩阵复合运算方法对水质进行综合评价,并建立水质污染预测模型,进行水质污染趋势分析。最后,提出了淀山湖水污染防治的对策和措施。  相似文献   

微型生态系统中鲢、鳙下行影响的实验研究——1.浮游生物群落和初级生产力   总被引：7，自引：0，他引：7  

阮景荣  戎克文  王少梅 《湖泊科学》1995,7(3):226-234

在营养物供给量较大的实验条件下,鲢、鳙放养明显地改变了微型生态系统的群落结构、代谢和理化环境,以致实验后期鳙单养和鲢、鳙混养系统出现不同程度的富营养化。微型生态系统中浮游植物密度的增长不完全由营养级联效应所致,但初级生产力的组间差异可大致依据营养级联假说来解释。实验结果认为,以提高鱼产量为目标的鲢、鳙高密度放养,对加速营养物来源丰富的天然水域的富营养化起着重要的作用。  相似文献   

Effects of mineral-organic fertilizer on the biomass of green Chinese cabbage and potential carbon sequestration ability in karst areas of Southwest China     

Qibiao Sun  Yulong Ruan  Ping Chen  Shijie Wang  Xiuming Liu  Bin Lian 《Acta Geochimica》2019,(3):430-439

The karst mountain areas of Southwest China contain barren farmland soils and suffer from nutritional and water deficiencies that affect crop productivity. Hence,it is imperative to apply suitable fertilizers to restore soil fertility and maintain crop yield. The aim of this study is to investigate the effects of mineral-organic fertilizer(MOF)made of potassic rock and organic waste on the growth of crops. For this purpose, green Chinese cabbage grown using three different fertilization methods including MOF,inorganic fertilizer(IF), and a control was evaluated. We determined soil water content, agronomic characteristics,and biomass of green Chinese cabbage in different treatments. Furthermore, surface runoff from the pot experiments and soil leachate from pot experiments were collected to determine water temperature, pH, and cation and anion concentrations. The results demonstrate thatMOF can improve the soil water-holding capacity of soil,and the basic agronomic characteristics of the cabbage treated with MOF were superior to those with IF. Using MOF can promote the increase in cabbage biomass.Additionally, the concentration of inorganic carbon(largely in the form of HCO_3^-) in surface runoff water treated by MOF was higher than the other treatments, establishing carbon sequestration potential. This work provides a novel and environmentally friendly fertilization pattern in karst areas, which will improve crop yield and also increase the carbon sequestration potential of crops.  相似文献   

文蛤亮氨酸氨肽酶LAP3的基因克隆及其在幼体不同发育时期、成体不同组织的表达分析     

阮文斌  董迎辉  高晓艳  刘晨珊  林德海  林志华 《海洋学报》2017,39(2):96-104

为探索贝类LAP3基因的结构和功能特征以及在生长发育过程中的作用,利用cDNA末端快速扩增（RACE）法获得文蛤LAP3（Mm-LAP3）基因的cDNA全长序列,并对其生物信息学、组织及发育时期表达特征进行了分析。结果显示,Mm-LAP3基因cDNA全长2 037 bp,ORF区1 254 bp,编码417个氨基酸;Mm-LAP3蛋白由Peptidase_M17超家族序列的N-端结构域和Peptidase_M17催化结构域组成。荧光实时定量PCR结果表明,Mm-LAP3基因在文蛤成体6个组织和幼体10个发育时期中均有表达,其中在斧足中的表达量显著高于其他组织（P<0.05）,这与斧足蛋白含量丰富、代谢旺盛相关;在幼体10个发育时期中的表达量呈现逐渐升高的趋势,在D形幼虫时期达到最高,随后又有所降低,推测Mm-LAP3基因在早期发育时期参与了某些组织器官的形成。  相似文献   

Crustal structure of the Southwest Subbasin,South China Sea,from wide-angle seismic tomography and seismic reflection imaging     

Zhiteng?YuEmail author  Jiabiao?LiEmail author  Weiwei?Ding  Jie?Zhang  Aiguo?Ruan  Xiongwei?Niu 《Marine Geophysical Researches》2017,38(1-2):85-104

The Southwest Subbasin (SWSB) is an abyssal subbasin in the South China Sea (SCS), with many debates on its neotectonic process and crustal structure. Using two-dimensional seismic tomography in the SWSB, we derived a detailed P-wave velocity model of the basin area and the northern margin. The entire profile is approximately 311-km-long and consists of twelve oceanic bottom seismometers (OBSs). The average thickness of the crust beneath the basin is 5.3 km, and the Moho interface is relatively flat (10–12 km). No high velocity bodies are observed, and only two thin high-velocity structures (~7.3 km/s) in the layer 3 are identified beneath the northern continent-ocean transition (COT) and the extinct spreading center. By analyzing the P-wave velocity model, we believe that the crust of the basin is a typical oceanic crust. Combined with the high resolution multi-channel seismic profile (MCS), we conclude that the profile shows asymmetric structural characteristics in the basin area. The continental margin also shows asymmetric crust between the north and south sides, which may be related to the large scale detachment fault that has developed in the southern margin. The magma supply decreased as the expansion of the SWSB from the east to the west.  相似文献   

Physiological acclimation strategies of riparian plants to environment change in the delta of the Tarim River,China     

Xiao Ruan  Qiang Wang  Cun-De Pan  Ya-Ning Chen  Hao Jiang 《Environmental Geology》2009,57(8):1761-1773

The occurrence and development of riparian forests, which were mainly dominated by mesophytes species related closely with surface water. Since there was no water discharged to the lower reaches of Tarim River in the past three decade years, the riparian forests degrade severely. The groundwater table, the saline content of the groundwater, as well as the content of free proline, soluble sugars, plant endogenous hormones (abscisic acid (ABA), and cytokinins (CTK)) of the leaves and relative rates of sap flow of the Populus euphratica Oliv. (arbor species), Tamarix ramosissima Ldb. (bush species), and Apocynum venetum L. (herb species) were monitored and analyzed at the lower reaches of the Tarim River in the study area where five positions on a transect were fixed at 100 m intervals along a sampling direction from riverbank to the sand dunes before and after water release. The physiological responses and acclimation strategies of three species to variations in water and salinity stress were discussed. It was found that A. venetum population recovered to groundwater table ranging from −1.73 to −3.56 m, and when exposed to saline content of the groundwater ranging from 36.59 to 93.48 m mol/L; P. euphratica appeared to be more sensitive to the elevation of groundwater table than the A. venetum and T. ramosissima at groundwater table ranging from −5.08 to −5.80 m, and when exposed to saline content of the groundwater ranging from 42.17 to 49.55 m mol/L. T. ramosissima tended to be the best candidate species for reclamation in this hyper-arid area because it responded to groundwater table ranging from −1.73 to −7.05 m, and when exposed to saline content of the groundwater ranging from 36.59 to 93.48 m mol/L. These results explained the distribution patterns of desert vegetation in the lower reaches of the Tarim River. Understanding the relationships among ecological factors variables, physiological response and acclimation strategies of plant individuals could provide guidance to sustainable management, reclamation and development of this and similar regions.  相似文献