Remote sensing analysis of mangrove distribution and dynamics in Zhanjiang from 1991 to 2011

Mangrove forests provide valuable societal and ecological services and goods. However, they have been experiencing high annual rates of loss in many parts of the world. In order to evaluate a long-term wetland conservation strategy that compromises urban development with comprehensive wetland ecosystem management, remote sensing techniques were used to analyze the changing mangrove distribution in the Zhanjiang Mangrove Forest National Nature Reserve. Between 1991 and 2000, the mangrove area within the study region declined from 2 264.9 to 2 085.9 ha consistent with an annual decrease of 0.79%. However, there was an overall 34.3% increase in mangrove coverage from 2 085.9 to 2 801.8 ha between 2000 and 2011. Major causes of forest loss include local human pressures in the form of deforestation, conversion to agriculture, and natural forces such as erosion. The recent gain in mangrove forest cover is attributed to eff ective conservation management in the nature reserve area, including intensive mangrove plantation eff orts and increased local awareness of wetland conservation.

Earthquake dynamic response behavior of Xiangchong valley type tailings impoundment in Yunnan, China

Tailings impoundments can potentially collapse due to damage caused by earthquakes,which has frequently occurred around the world.This study takes the proposed valley type tailings impoundment in Yunnan as the research object to analyze the dynamic response behavior under earthquake action with both numerical simulation and physical model test(1:300).The results of both tests show that the dynamic response of the valley type tailings impoundment is characterized by"medium stiffness effect",in other words,in a certain range,the"softer"the unsaturated tailings sand is,the more energy it can dissipate,which leads the decrease of the value of the acceleration amplification factor.In addition,the peak acceleration of the monitoring points increases with the vertical elevation,which indicates that the"elevation amplification effect"exists in the tailings impoundment dynamic response.The middle part of the outer side of the raised embankment reacts more sensitive than the crest,which is similar to the slope dynamic response.The starter dam reacts sensitively under the earthquake excitation,which should be given more attention during the seismic design.The dynamic response rules reflected by the numerical simulation are consistent with the results monitored on the physical model test,although there are some differences between their values.The dynamic response rules of the valley type tailings impoundment can provide basis for the design of the similar projects in this region.

Current Situation and Protection Measures concerning the Wetland Resources in Yunnan Province

Yunnan has various and rich wetland resources because of the special geographical environment. In recent years,Yunnan has made great achievement in the management,protection and development of the wetland resources,but many problems still exist. Based on the threats,this paper puts forward the protection and use measures for the wetland resources in Yunnan by analyzing and studying the wetland resources as well as types and basic features.

Study on Comparative Advantage of Plateau Characteristic Agriculture in Yunnan

To find the highlighted advantage and development space of plateau characteristic agriculture in Yunnan,using qualitative and quantitative combining methods,comparative advantage of plateau characteristic agriculture in Yunnan is evaluated comprehensively.Qualitation takes Sichuan,Chongqing,Guizhou and Guangxi adjacent to Yunnan and Southeast Asian countries which are opening focus of " bridgehead" as reference objects,while quantitation takes 32 provinces of whole country except Hongkong and Macao as reference objects,and there are 4 kinds of qualitation indexes and 6 kinds of quantitation indexes containing 44 sub-items.Results show that comprehensive comparative advantage coefficient of plateau characteristic agriculture in Yunnan is 1.55,and it has 3 kinds of comprehensive comparative advantages:diversity,ecological security and time difference complementation.The research results could provide references for agricultural development in Yunnan and other plateau regions.

Analysis of Influencing Factors Tourists1 Purchase Decision-making Behavior in Kunming

Based on the theory of consumer behavior,this paper analyzes the current situation of tourism shopping market in Kunming,and analyzes the decision-making behavior of tourists shopping in Kunming with the questionnaire survey,and clarifies the influencing factors of the decision-making behavior of visitors to Kunming.In the future,the influencing factors of Kunming tourists'shopping decision-making behavior are combined with the current situation of Kunming's tourism shopping market.The problems of cheating-induced shopping,the high price of shopping products,the low level of tourism shopping experience and the imperfect after-sales service are analyzed.Finally,the corresponding countermeasures and suggestions are proposed from four aspects:rectifying the tourism shopping market,establishing a sound price supervision mechanism,strengthening the tourism shopping experience,and improving after-sales service.

长江中下游流域旱涝急转事件特征分析及其与ENSO的关系（英文）

During recent decades,more frequent flood-drought alternations have been seen in China as a result of global climate change and intensive human activities,which have significant implications on water and food security.To better identify the characteristics of flood-drought alternations,we proposed a modified dry-wet abrupt alternation index(DWAAI)and applied the new method in the middle and lower reaches of the Yangtze River Basin(YRB-ML)to analyze the long-term spatio-temporal characteristics of dry-wet abrupt alternation(DWAA)events based on the daily precipitation observations at 75 rainfall stations in summer from 1960 to 2015.We found that the DWAA events have been spreading in the study area with higher frequency and intensity since 1960.In particular,the DWAA events mainly occurred in May and June in the northwest of the YRB-ML,including Hanjiang River Basin,the middle reaches of the YRB,north of Dongting Lake and northwest of Poyang Lake.In addition,we also analyzed the impact of El Ni?o Southern Oscillation(ENSO)on DWAA events in the YRB-ML.The results showed that around 41.04%of DWAA events occurred during the declining stages of La Ni?a or within the subsequent 8 months after La Ni?a,which implies that La Ni?a events could be predictive signals of DWAA events.Besides,significant negative correlations have been found between the modified DWAAI values of all the rainfall stations and the sea surface temperature anomalies in the Nino3.4 region within the 6 months prior to the DWAA events,particularly for the Poyang Lake watershed and the middle reaches of the YRB.This study has significant implications on the flood and drought control and water resources management in the YRB-ML under the challenge of future climate change.