松嫩平原西部盐碱湿地农业的范例:苇-鱼-蟹-菌模式     

李晓宇  刘兴土  李秀军  姜明  杨富亿  文波龙 《湿地科学》2021,(1)

湿地农业发展历史悠久,是世界农业文化遗产的重要组成部分,也是人类农业文明的见证。湿地农业随着社会发展,不断调整和适应,形成不同的功能类型和产业模式。以松嫩平原西部盐碱湿地苇-鱼-蟹-菌模式为例,凝练了湿地生态恢复和资源合理利用的关键技术,分析了该模式显著的生态和经济效益,总结了该模式逐渐形成和发展的经验,提出了未来湿地农业发展的建议,以期为维持湿地生态系统的可持续发展提供参考依据。  相似文献   

Dynamic features of near-inertial oscillations in the Northwestern Pacific derived from mooring observations from 2015 to 2018     

Hu  Shijian  Liu  Lingling  Guan  Cong  Zhang  Linlin  Wang  Jianing  Wang  Qingye  Ma  Jie  Wang  Fujun  Jia  Fan  Feng  Junqiao  Lu  Xi  Wang  Fan  Hu  Dunxin 《中国海洋湖沼学报》2020,38(4):1092-1107

Near-inertial oscillation is an important physical process transferring surface wind energy into deep ocean.We investigated the near-inertial kinetic energy(NIKE) variability using acoustic Doppler current profiler measurements from a mooring array deployed in the tropical western Pacific Ocean along130°E at 8.5°N,11°N,12.6°N,15°N,and 17.5°N from September 2015 to January 2018.Spatial features,decay timescales,and significant seasonal variability of the observed NIKE were described.At the mooring sites of 17.5°N,15°N,and 12.6°N,the NIKE peaks occurred in boreal autumn and the NIKE troughs were observed in boreal spring.By contrast,the NIKE at 11°N and 8.5°N showed peaks in winter and troughs in summer.Tropical cyclones and strong wind events played an important role in the emergence of high-NIKE events and explained the seasonality and latitudinal characteristics of the observed NIKE.  相似文献   

The Potential Vertical Distribution of Bigeye Tuna ( Thunnus obesus ) and Its Influence on the Spatial Distribution of CPUEs in the Tropical Atlantic Ocean     

Shenglong Yang  Liming Song  Yu Zhang  Wei Fan  Bianbian Zhang  Yang Dai  Heng Zhang  Shengmao Zhang  Yumei Wu 《中国海洋大学学报(英文版)》2020,19(3):669-680

Understanding the potential vertical distribution of bigeye tuna(Thunnus obesus) is necessary to understand the catch rate fluctuations and the stock assessment of bigeye tuna. To characterize the potential vertical distribution of this fish while foraging and determine the influences of the distribution on longline efficiency in the tropical Atlantic Ocean, the catch per unit effort(CPUE) data were compiled from the International Commission for the Conservation of Atlantic Tunas and the Argo buoy data were downloaded from the Argo data center. The raw Argo buoy data were processed by data mining methods. The CPUE was standardized by support vector machine before analysis. We assumed the depths with the upper and lower limits of the optimum water temperatures of 15℃ and 9℃ as the preferred swimming depth, while the lower limit of the temperature(12℃) associated with the highest hooking rate as the preferred foraging depth(D12) of bigeye tuna during the daytime in the Atlantic Ocean. The preferred swimming depth and foraging depth range in the daytime were assessed by plotting the isobath based on Argo buoy data. The preferred swimming depth and vertical structure of the water column were identified to investigate the spatial effects on the CPUE by using a generalized additive model(GAM). The empirical cumulative distribution function was used to assess the relationship between the spatial distribution of CPUE and the depth of 12℃ isolines and thermocline. The results indicate that 1) the preferred swimming depth of bigeye tuna in the tropical Atlantic is from 100 m to 400 m and displays spatial variation; 2) the preferred foraging depth of bigeye tuna is between 190 and 300 m and below the thermocline; 3) the number of CPUEs peaks at a relative depth of 30 –50 m(difference between the 12℃ isolines and the lower boundary of the thermocline); and 4) most CPUEs are within the lower depth boundary of the thermocline levels(LDBT) which is from 160 m to 230 m. GAM analysis indicates that the general relationship between the nominal CPUE and LDBT is characterized by a dome shape and peaks at approximately 190 m. The oceanographic features influence the habitat of tropical pelagic fish and fisheries. Argo buoy data can be an important tool to describe the habitat of oceanic fish. Our results provide new insights into how oceanographic features influence the habitat of tropical pelagic fish and fisheries and how fisheries exploit these fish using a new tool(Argo profile data).  相似文献   

Characteristics and Origins of Suspended Pyrite in the Mixing Zone of the Yangtze Estuary     

Pang  Yue  Fan  Dejiang  Sun  Xiaoxia  Sun  Xueshi  Liu  Ming  Yang  Zuosheng 《中国海洋大学学报(英文版)》2020,19(4):801-810

For a long time, most studies about pyrite have focused on sediments while only a few have focused on pyrite in water. In this study, a method that combines the scanning electron microscopy(SEM) and the energy dispersive X-ray spectrometry(EDS) was used to compare pyrite particles suspended in water to those in associated bottom sediments, both obtained from the mixing zone of the Yangtze Estuary. It was found that the pyrite particles in the two media have similar morphologies and size distributions. The particle morphology mainly includes two types, single crystal and aggregate, and the particle size mainly ranges from 0.5 to 2 μm. The pyrite particles in water exhibit an increase in relative content towards the sea, and their transport and deposit processes are mainly affected by hydrodynamic conditions. It is concluded that the pyrite particles in the suspended matter mainly derived from the resuspension of sediments, which are products of the early diagenesis. Precursor minerals may appear during the formation of pyrite, but are generally restricted by the diagenetic environment and local microenvironment.  相似文献   

Transcriptomic Profiling of the Immune Response to Crowding Stress in Juvenile Turbot (Scophthalmus maximus)     

Huo  Huanhuan  Gao  Xiaoqiang  Fei  Fan  Qin  Fei  Huang  Bin  Liu  Baoliang 《中国海洋大学学报(英文版)》2020,19(4):911-922

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成长型城市群产业生态化时空演化特征及其影响因素——以山东半岛城市群为例          下载免费PDF全文

吴帆  郭付友  马媛媛  魏凤冉  刘静怡  刘英杰 《山东国土资源》2020,36(4):68-73

该文以山东半岛城市群作为研究对象,构建产业生态化综合评价指标体系,运用熵值法与主成分分析方法,探讨了山东半岛城市群产业生态化总体水平的时空分异特征及影响因素。结果表明:2004—2016年,山东半岛城市群产业生态化呈现上升趋势,山东半岛城市群产业生态化发展水平不断提高;山东半岛城市群产业生态化空间分异现象显著,形成了以济南和青岛为核心的两极化发展特征;山东半岛城市群产业生态化发展水平的区域化现象愈加明显,呈现出NE—SW走向的不均衡发展;山东半岛城市群产业生态化发展影响因素为区域经济发展水平、政府监管水平、外资利用差异以及区域科学技术差异。  相似文献   

DNQ3型能见度仪故障分析及校准方法研究          下载免费PDF全文

卢舟  王凡  王舜  刘钟中  刘志鹏  佘菁力 《中低纬山地气象》2023,47(2):114-118

为有效提高国家气象观测站能见度数据的准确性,确保能见度自动观测连续不断,对能见度仪开展故障维修、核查校准和疑误数据质控等工作显得非常重要。该文通过DNQ3型前向散射能见度仪的硬件结构和基本工作原理的介绍,以及对一些典型故障进行分析,总结出能见度仪的检测维修流程,归纳了对应的故障解决措施,凝练出该型能见度仪的核查校准和疑误数据质控方法,为一线业务人员排查能见度仪常规维护、故障排查、运行监控等提供借鉴。  相似文献   

The Characteristics and Controlling Factors of Water and Heat Exchanges over the Alpine Wetland in the East of the Qinghai–Tibet Plateau     

Jinlei CHEN  Yuan YUAN  Xianyu YANG  Zuoliang WANG  Shichang KANG  Jun WEN 《大气科学进展》2023,40(2):201-210

Alpine wetland is one of the typical underlying surfaces on the Qinghai–Tibet Plateau. It plays a crucial role in runoff regulation. Investigations on the mechanisms of water and heat exchanges are necessary to understand the land surface processes over the alpine wetland. This study explores the characteristics of hydro-meteorological factors with in situ observations and uses the Community Land Model 5 to identify the main factors controlling water and heat exchanges.Latent heat flux and therm...  相似文献   

Another Year of Record Heat for the Oceans     

Lijing CHENG  John ABRAHAM  Kevin E.TRENBERTH  John FASULLO  Tim BOYER  Michael E.MANN  Jiang ZHU  Fan WANG  Ricardo LOCARNINI  Yuanlong LI  Bin ZHANG  Fujiang YU  Liying WAN  Xingrong CHEN  Licheng Feng  Xiangzhou SONG  Yulong LIU  Franco RESEGHETTI  Simona SIMONCELLI  Viktor GOURETSKI  Gengxin CHEN  Alexey MISHONOV  Jim REAGAN  Guancheng LI 《大气科学进展》2023,40(6):963-974

Changes in ocean heat content(OHC), salinity, and stratification provide critical indicators for changes in Earth’s energy and water cycles. These cycles have been profoundly altered due to the emission of greenhouse gasses and other anthropogenic substances by human activities, driving pervasive changes in Earth’s climate system. In 2022, the world’s oceans, as given by OHC, were again the hottest in the historical record and exceeded the previous 2021 record maximum.According to IAP/CAS data, ...  相似文献   

Impacts of Increasing Model Resolutions and Shortening Forecast Lead Times on QPFs in South China During the Rainy Season     

张旭斌  李静珊  罗亚丽  宝兴华  陈靖扬  肖辉  文秋实 《热带气象学报(英文版)》2023,29(3):277-300

This study investigated the impacts of increasing model resolutions and shortening forecast lead times on the quantitative precipitation forecast(QPF) for heavy-rainfall events over south China during the rainy seasons in 2013–2020.The control experiment, where the analysis-forecast cycles run with model resolutions of about 3 km, was compared to a lower-resolution experiment with model resolutions of about 9 km, and a longer-term experiment activated 12 hours earlier. Rainfall forecasting in th...  相似文献