Key Laboratory of Poyang Lake Wetland and Watershed Research

Nanchang, China

Key Laboratory of Poyang Lake Wetland and Watershed Research

Nanchang, China
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Li L.,Hohai University | Li L.,Key Laboratory of Poyang Lake Wetland and Watershed Research | Zhu W.,Hohai University
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2013

In order to reveal the effects of competition of other algae and Microcystis on growth of Microcystis under flow condition before the formation of algal blooms, and the growth of Microcystis aeruginosa is affected by Scenedesmus quadricauda under flow conditions, experiments are conducted by plexiglass ring groove in axenic laboratory. The competition relationship affected by competition parameters, density and specific growth rate of Microcystis are analyzed. The results show that the Microcystis aeruginosa adaptability on flow water is reduced under the competition between Scenedesmus quadricauda and Microcystis aeruginosa, namely, the optimal flow rate in simple and mix culture are 35 cm/s and 5 cm/s respectively. The exponential growth time of Microcystis aeruginosa under mix culture are longer than under simple culture. Microcystis aeruginosa growth are stimulated and its specific growth rate increase by Scenedesmus quadricauda at flow rate from 0 to 25 cm/s, contrary to these results at 35 cm/s. The growth of Scenedesmus quadricauda is slightly inhibited by Microcystis aeruginosa in control group and treatment groups during the experiment.

Zhou J.,China Ship Development And Design Center | Zu X.,Jiangxi Normal University | Zu X.,Key Laboratory of Poyang Lake Wetland and Watershed Research
WIT Transactions on the Built Environment | Year: 2014

The leapfrog development of world economy and shipbuilding industry has proposed new challenges for the informatization construction of shipbuilding industry. The characteristics of GIS technology are briefly described in this paper, combined with the informatization needs of shipbuilding industry, the applications in typical scenes and brief design ideas of ship's information system based on GIS and GPS are proposed in this paper. © 2014 WIT Press.

Zhou J.,China Ship Development And Design Center | Luo J.,Jiangxi Normal University | Luo J.,Key Laboratory of Poyang Lake Wetland and Watershed Research
WIT Transactions on the Built Environment | Year: 2014

This paper introduces the history of software development technology and the GIS development mode accompanying that. It analyzes the weak points of the code-based development and compares the development phases of different software development modes with typical GIS platforms, thus leading to the idea of built-in development and its application characteristics, with a thorough discussion of the evolution of GIS software development technology. © 2014 WIT Press.

Xu Q.,Hohai University | Cheng Y.,Technical University of Denmark | Cheng Y.,State Key Laboratory of Satellite Ocean Environment Dynamics | Li X.,National Oceanic and Atmospheric Administration | And 2 more authors.
Procedia Environmental Sciences | Year: 2011

The hurricanes can be detected by many remote sensors, but synthetic aperture radar (SAR) can yield high-resolution (sub-kilometer) and low-level wind information that cannot be seen below the cloud by other sensors. In this paper, an assessment of SAR capability of monitoring high-resolution hurricane was conducted. A case study was carried out to retrieve ocean surface wind field from C-band RADARSAT-1 SAR image which captured the structure of hurricane Helene over the Atlantic Ocean on 20 September, 2006. With wind direction from the outputs of U.S. Navy Operational Global Atmospheric Prediction System (NOGAPS) model, C-band geophysical model functions (GMFs) which describe the normalized radar cross section (NRCS) dependence on the wind speed and the geometry of radar observations (i.e., incidence angle and azimuth angle with respect to wind direction) such as CMOD5 and newly developed CIWRAP models have been tested to extract wind speed from SAR data. The SAR retrieved ocean surface winds were compared to the aircraft wind speed observations from stepped frequency microwave radiometer (SFMR). The results show the capability of hurricane wind monitoring by SAR. © 2011 Published by Elsevier Ltd.

Hu Q.,Jiangxi Normal University | Hu Q.,Key Laboratory of Poyang Lake Wetland and Watershed Research | Zhu L.,Jiangxi Normal University | Xing R.,Jiangxi Normal University | And 2 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2011

As the largest natural source of methane to the atmosphere, wetlands play an important role in global carbon cycles. Since methane flux data were not available in numerous wetland types over the world, there were still some uncertainties in global wetland methane budgets. In China, methane flux measurements in wetlands were mostly conducted in cold regions, such as the Sanjiang Plain and the Tibetan Plateau. However, few were conducted in southern wetlands for accurate methane budgets estimation in Chinese wetlands. Poyang Lake is the largest fresh lake in China, where the typical lake wetland covered approximately 3130 km 2 area. In this study, the marshland dominated by Carex cinerascens was selected for methane flux measurements, which is located in the national nature reserve, Nanji wetlands of Poyang Lake. To monitor methane flux from this type of wetlands, two treatments were designed: maintaining aboveground parts (TC) and removing aboveground parts (TJ), with three replicates for each treatment. Methane flux was measured between 9:00 and 11:00 at local time using a closed chamber-gas chromatograph method from May 2009 to April 2010, twice or three times per month. We aimed to clarify the characteristics of methane flux from the Carex-dominated wetland and their control factors, and thus provide basic data for further carbon budgets in the Poyang Lake wetland. Methane fluxes of the two treatments showed a clear seasonal variation pattern. It varied from -0. 094 to 17. 75 mg CH 4·m -2·h -1 for the TC treatment, and ranged from -0. 122 to 19. 16 mg CH 4·m -2·h -1for the TJ treatment, respectively. Methane emission occurred in time, while its uptake only occurred in the winter. Methane emission rate increased dramatically when the soil surface was covered by substantial water, the maximum in the flooded period was nearly 100 times higher than in the non-flooded period. In contrast to wetlands in other regions, the mean value of methane flux (13. 05 mg · m -2· h -1) from the one dominated by Carex cinerascens in the Poyang Lake under the standing water regime was higher than those in the Zoige Plateau, where they are dominated by Carex muliensis and Carex meyeriana, but lower than those in the Sanjiang Plain dominated by Carex lasiocarpa. Before flooding, methane flux from the TJ treatment was significantly higher than from the TC treatment (t = 2. 69, P <0. 05). However, methane flux from the TJ treatment was much lower than from the TC treatment when the standing water table reached 15 cm depth. When Carex cinerascens was completed submerged, methane emission rate decreased by 75% in contrast to the condition that Carex cinerascens was partly submerged, as methane transmission was suppressed by the deep standing water. This confirmed that the aboveground plants in wetlands act as an additional methane transmission pathway. Soil moisture and soil temperature at 5 cm depth were positively correlated to methane flux of both treatments before soil surface was submerged. The two factors mainly controlled the methane flux variation before flooding, which could explain 65% to 74% variability of methane flux. During the experiment, methane emission from the Carex cinerascens dominated wetland was 12. 77gC/m 2, which accounted for approximately 4% of soil microbial respiration, but less than 1% net primary productivity. Given the global warming potential of methane is 25 times higher than carbon dioxide, our result suggested that methane emission is as equally important as carbon dioxide despite its lower emission rates.

Luo X.,Wuhan University | Peng J.,Wuhan University | Luo J.,Key Laboratory of Poyang Lake Wetland and Watershed Research | Luo J.,Jiangxi Normal University
Energy Education Science and Technology Part A: Energy Science and Research | Year: 2014

The landslide disaster has become the second largest natural disaster. To analyze the landslide disaster caused by the rainfall, this paper collected and analyzed the data about disaster and rainfall of nearly eight years in Lanzhou, and studied the spatiotemporal coupling early Warning model for the landslide disaster. Then, on the platform of MapGIS IGServer, it utilized the new RIA technology Silverlight and the coupling with Web Service to establish the meteorological Warning system for geological disaster in Lanzhou by the process-oriented mode and in a network with asynchronous response. The test indicates that this model could provide more accurate and timely information for the development of disaster prevention countermeasures. © Sila Science. All Rights Reserved.

Fang C.,Key Laboratory of Poyang Lake Wetland and Watershed Research | Yang J.,Jiangxi Normal University | Yuan Y.,Jiangxi Normal University
Communications in Computer and Information Science | Year: 2011

ENVISAT ASAR data's ability of penetrating through cloud and rain belt is stronger. It is an important data source to extract water coverage during cloudy rainy weather conditions on the flood reason of Poyang Lake. This paper used ENVISAT ASAR data, monitored the variations of Poyang Lake water area in 2009 by the partition threshold method. Finally get Poyang Lake water coverage's area and spatial distribution. Through the construction of sharing service platform achieve real-time information sharing of Poyang Lake water coverage thematic maps, make users at all levels can obtain real-time, rapid, low cost monitoring information of Poyang Lake, and provide the flood disaster quasi real-time monitoring and warning service, which provide a reliable and important data support for Poyang Lake water allocation, flood and drought disaster reduction, disaster assessment and post-disaster compensation. © 2011 Springer-Verlag.

Luo J.,Jiangxi Normal University | Luo J.,Key Laboratory of Poyang Lake Wetland and Watershed Research
Applied Mechanics and Materials | Year: 2013

With the specific cases, this paper summarizes the general process, target, framework, database logical and physical structure and various application function of environment geology information system based on GIS, in order to provide some reference for the construction of relevant system. © (2013) Trans Tech Publications, Switzerland.

Wu J.H.,Key Laboratory of Poyang Lake Wetland and Watershed Research | Wu J.H.,Jiangxi Normal University | Gong J.,Jiangxi Normal University | Hu Y.Z.,Environmental Monitoring Center Station of Jiangxi Province | Wan Y.Y.,Jiangxi Normal University
Applied Mechanics and Materials | Year: 2014

Expounded research background and significance of Poyang Lake smart water resource monitoring, proposed a new theory research framework of Poyang Lake smart water resource monitoring based on WSN and 3S spatial information technologies, explored the related basic theories and methods which applied to the research of water resource smart monitoring, summarized the key issues in the researches of building wireless sensor network architecture and multi-sensor fusion physics platform for Poyang Lake water resource monitoring, methods of multi-sensor information extraction, access, processing and storage, the Poyang Lake water monitoring information spatializiation methods, multi-sensor data anomaly detection methods, and gave the research ideas and problem-solving strategies. Eventually, through the establishment of a practical and reliable Poyang Lake smart water resource monitoring system, improve flexibility, real-time, space visibility of water resource monitoring. © (2014) Trans Tech Publications, Switzerland.

Chen P.,Southwest University | Chen P.,State Key Laboratory of Information Engineering in Surveying | Chen X.,Southwest University | Chen X.,Key Laboratory of Poyang Lake Wetland and Watershed Research
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2011

Drought is one of the principal pertubations in Poyang Lake Ecological Economic Zone(PLEEZ). It is important to investigate the mechanism of droughts in order to evaluate potential losses of droughts and provide a scientific basis for policymaking. We selected fourteen indicators representing exposure, sensitivity and adaptive capacity to droughts respectively. The weights of the indicators were calculated by analytic hierarchy process. Then using the composite index approach these indicators were combined into a drought vulnerability index of agricultural system by a linear aggregation. Maps of drought vulnerability and its elements in PLEEZ were drawn by applying the software of ArcGIS9.3. The results showed that the drought vulnerability of the agricultural system in PLEEZ were mainly at middle rank. Spatial differentiation of the drought vulnerablity existed that the rank of the drought vulnerability in the northern areas of PLEEZ were higher than that in the south. On the basis of the relationship between the drought vulnerability and exposure, sensitivity and adaptive capability, some suggestions for the drought hazard management in the future were proposed.

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