基于主体功能区的土地利用分区研究——以环鄱阳湖区为例

在主体功能分区基础上,对环鄱阳湖区进行土地利用分区,以实现空间有序发展和土地利用的差异化管理,为区域可持续发展提供土地保障.根据环鄱阳湖区主体功能分区图、土地利用现状图、土地适宜性评价结果图,在ArcGIS9.2中进行叠置分析和空间聚类分析,通过制定基于主体功能区的土地利用分区属性赋值规则,得到环鄱阳湖区土地利用分区图.在土地利用政策层面协调主体功能分区和土地利用分区的基础上,将环鄱阳湖区划为农业用地区、生态林用地区、城镇及工业用地区和湿地保护区,并提出了相应的土地用途管制措施.     

国际青藏高原及其周边地区研究文献计量分析报告(2003-2008年)

青藏高原及其周边地区是地球上一个特殊的自然环境地区,其地表变化、生态环境的特殊性及其对地球气候的影响使得这一地区成为地学、资源环境科学、生态学等学科的研究热点和关键领域。本文以国际著名的ISI Web of Science数据库为数据源,搜集ISI数据库在2003-2008年间所报道的国际青藏高原及其周边地区研究文献及其引用情况,通过文献计量学方法,从多个角度对青藏高原及其周边地区研究现状与进展情况进行分析,包括国家、年代分布、研究机构、著者、发表期刊、合作国家、合作机构等,在此基础上总结了近几年国际青藏高原及其周边地区的研究特点。     

大气水汽同位素组成的短期变异特征

Stable isotopes of atmospheric water vapor reveal rich information on water movement and phase changes in the atmosphere. Here we presented two nearly continuous time-series of δD and δ18O of atmospheric water vapor (δv) measured at hourly intervals in surface air in Beijing and above a winter wheat canopy in Shijiazhuang using in-situ meas-urement technique. During the precipitation events, the δv values in both Beijing and Shiji-azhuang were in the state of equilibrium with precipitation water, revealing the influence of precipitation processes. However, the δv departures from the equilibrium state were positively correlated with local relative humidity. Note that the δv tended to enrich in Beijing, but deplete in Shijiazhuang during the precipitation events, which mainly resulted from the influence of transpiration processes that enriched the δv in Shijiazhuang. On seasonal time-scale, the δv values were log-linear functions of water vapor mixing ratios in both Beijing and Shijiazhuang. The water vapor mixing ratio was an excellent predictor of the δv by the Rayleigh distillation mechanisms, indicating that air mass advection could also play an important role in deter-mining the δv. On a diurnal time-scale, the δv reached the minimum in the early afternoon hours in Beijing which was closely related to the atmospheric processes of boundary layer entrainment. During the peak of growing season of winter wheat, however, the δv reached the minimum in the early morning, and increased gradually through the daytime, and reached the maximum in the late afternoon, which was responsible by the interaction between boundary layer entrainment and the local atmospheric processes, such as transpiration and dew for-mation. This study has the implications for the important role of vegetation in determining the surface δv and highlights the need to conduct δv measurement on short-term (e.g. diurnal) time scales.     

A Preliminary study on traditional level-trench method to prevent rill initiation in the Three Gorges region, China

The level-trench method is a traditional tillage operation to develop a drainage system on slope land in the Three Gorges region.Before crops are planted,farmers prepare the land with level trenches spaced 3-10 m apart,depending on the slope gradient:steeper slopes require shorter distances.Little scientific analysis has been done on the use of traditional level trenches for soil conservation.We conducted a field investigation and simulation experiments,and present a comparison between the spacing of level trenches and the slope length required for rill initiation.The results indicate that the spacing of level trenches in farmland is close to the slope length required for rill initiation in the experimental plots,and regression models of trench spacing with the gradient and the slope length required for rill initiation with the gradient have similar formats;the coefficients of determination (R2) for the two equations are 0.99 and 0.88,respectively.There were some differences between the field survey and experiments,but we conclude that the traditional level-trench method has an important role in preventing rill initiation.     

An Investigation of the CME of 3 November 2011 and Its Associated Widespread Solar Energetic Particle Event

Multi-spacecraft observations are used to study the in-situ effects of a large coronal mass ejection (CME) erupting from the farside of the Sun on 3 November 2011, with particular emphasis on the associated solar energetic particle (SEP) event. At that time both Solar Terrestrial Relations Observatory (STEREO) spacecraft were located more than 90 degrees from Earth and could observe the CME eruption directly, with the CME visible on-disk from STEREO-B and off the limb from STEREO-A. Signatures of pressure variations in the corona such as deflected streamers were seen, indicating the presence of a coronal shock associated with this CME eruption. The evolution of the CME and an associated extreme-ultraviolet (EUV) wave were studied using EUV and coronagraph images. It was found that the lateral expansion of the CME low in the corona closely tracked the propagation of the EUV wave, with measured velocities of 240±19 km?s^?1 and 221±15 km?s^?1 for the CME and wave, respectively. Solar energetic particles were observed to arrive first at STEREO-A, followed by electrons at the Wind spacecraft at L₁, then STEREO-B, and finally protons arrived simultaneously at Wind and STEREO-B. By carrying out a velocity-dispersion analysis on the particles arriving at each location, it was found that energetic particles arriving at STEREO-A were released first and that the release of particles arriving at STEREO-B was delayed by about 50 minutes. Analysis of the expansion of the CME to a wider longitude range indicates that this delay is a result of the time taken for the CME edge to reach the footpoints of the magnetic-field lines connected to STEREO-B. The CME expansion is not seen to reach the magnetic footpoint of Wind at the time of solar-particle release for the particles detected here, suggesting that these particles may not be associated with this CME.     

江西省避暑资源评估分析

利用1989—2018年江西省气象观测资料,分析了江西盛夏高温气候时空变化特征,绘制了避暑区划图,对避暑资源进行了研究评价.结果表明:2003年江西省高温天气出现了一个跳跃性的增长,1989—2002年高温日数平均为9.7 d,2013—2018年高温日数平均为22.1 d,增长了12.4 d.抚州市和上饶市分别有一个高温天气易发中心,鄱阳湖区和赣南南部山区则是高温天气的低发区;周边环山地区盛夏平均气温均在28℃以下,其覆盖面积约占江西省总面积的28.1％;盛夏平均最高气温在31℃以下的地区占全省面积的7.8％.高温日平均气温29℃以下的占全省面积的23.1％,高温日平均最高气温33℃以下的占全省面积的4.3％;江西省适宜避暑的地区占全省面积的15.2％,其中非常适宜避暑的地区占3.7％.赣州是江西省避暑资源最丰富的设区市,其次是靠近罗霄山脉的吉安和萍乡,以及靠近武夷山脉的上饶和抚州,九江庐山、南昌梅岭、宜春九岭山脉等处也是避暑资源丰富区.     

旅游景区市场营销策略探微

在目前旅游景区市场环境的基础上,探讨旅游景区市场营销途径.指出网络营销、合作集团营销、零距离服务营销、绿色营销是当前旅游景区市场营销途径的主体.     

乌塘鳢Bostrichthys sinensis（Lacépède）的年龄研究

研究乌塘鳢年龄的鉴定材料采用胸鳍支鳍骨。结果表明：胸鳍支鳍骨上骨化环的数目与年轮数目相一致，体长频率分布与各年龄组体长分布曲线基本相符。用胸鳍支鳍骨的骨化环来鉴定乌塘鳢的年龄是可信的。     

银河系中球状星团的空间分布和运动轨道

选用银河系中29个累积光谱型为F型的球状星团样本。根据它们的视向速度，绝对自行等参数，归算处理后得出了各样本星团的空间分布和运动速度。并以此作为初始条件，在给定的3种银河系引力势模型中，采用数值积分方法计算出各样本星团的运动轨道。计算结果表明：（1）大部分样本星团都位于银心距5kpc-10kpc的范围内，相对于银心呈球对称分布，它们的速度也呈椭球分布；（2）29个样本星团按其金属度大小和基本性发类，可分属HB和MP两个次系，且样本星团数随金属度[Fe/H]而变化，在[Fe/H]＝－1．6处出现一个峰值；（3）所有样本星团的轨道运动都呈周期性，大都在一个有界而不封闭的周期轨道上运动，其最大银心距大都在40kpc以内。不同的引力势模型对球状星团轨道的具体形态影响不大，在给定的引力势模型下，当某些星团的运动轨道穿越距银心1kpc附近的区域时会出现“混沌”行为。而样本星团的金属度与其轨道形态之间的相关性并不明显；（4）29个样本星团的轨道半长轴、远银心距和方位周期随金属度的变化规律基本相似。轨道偏心率与金属度有关，对于所选的晕族样本星团而言，大约有24％的样本星团的轨道偏心率低于0．4，不同的引力势模型对近银心距、偏心率和参数的不确定度等量影响较小，但是对远银心距、径向周期和方位周期等参数影响较为明显。