琼东南盆地深水区中央峡谷天然气成藏条件与成藏模式

利用钻井岩芯、岩屑地质化验资料及测井、二维、二维地震数据,综合分析了琼东南盆地深水区中央峡谷储层的发育特征、天然气成藏条件及成藏主控因素.结果表明,峡谷中、下部堆积的多期浊积砂岩,储集物性好,是该区带的优质储层;峡谷内发育的大量岩性、构造-岩性复合型圈闭为天然气聚集造就了重要场所;凹陷中的渐新统崖城组煤系烃源岩及广厚的半封闭浅海泥岩生气潜力大,提供了丰富的烃源基础;峡谷下方的底辟/微裂隙是深部崖城组烃源岩生成的天然气向上运移的重要通道.可见,中央峡谷成藏条件优越,圈闭有效性和运移是该区天然气成藏的关键要素;由于峡谷内圈闭大多数定型于上新世莺歌海组沉积时期,与下伏崖城组烃源岩主生气期形成合理配置,因此,天然气成藏较晚,L1、L2和L3气田的重大发现就是很好的例证.     

鄱阳湖环湖区生态系统服务价值时空变化及权衡协同关系

基于修订的当量因子表,结合1988—2020年7期土地利用数据,运用GIS数据处理和空间分析等方法探究了鄱阳湖环湖区生态系统服务价值的时空演变特征,同时引入生态系统服务权衡协同度模型对食物生产、水文调节、土壤保持等7项生态服务功能进行权衡与协同分析。结果表明：① 1988—2020年鄱阳湖环湖区生态系统服务价值从577.95亿元增至592.50亿元,呈先增后减再增的波动变化特征。② 生态系统服务价值的空间分布表现为明显的不均衡性,ESV显著减少的区域为南昌市区、九江市区以及其它各区县的城镇建成区,生态系统服务价值增加的区域均匀分布在研究区东北和西北地区以及靠近研究区外侧的东南和西南地区。③ 协同关系为生态系统服务之间的主导关系,权衡关系较少且主要存在于食物生产与其他服务之间。     

生态系统服务社会价值与生态价值的权衡与协同关系——以普达措国家公园为例

以香格里拉普达措国家公园为研究区,借助SolVES模型和InVEST模型,分别度量其社会价值（美学价值、文化价值、游憩价值）和生态价值（生境质量、碳储量、水源供给）的空间特征,并运用双变量空间自相关分析对二者空间权衡与协同关系进行研究。研究表明：① 社会价值的高值区呈“多核心,多条状”的空间格局,社会价值指数高达8.6（该指数介于1~10）,且距水体的距离越近对社会价值的贡献越大（贡献度为45.9%）;② 生态价值良好及优的空间范围占园区面积的1/2（49.91%）,主要位于原始森林保存良好的碧塔海片区和尼汝东北部扎诺一带;③ 社会价值与生态价值之间存在显著的空间依赖性,其中社会价值低,生态价值高的区域是园区最主要的空间聚集特征。该研究可为生态系统服务的可持续管理决策提供科学依据,以及有助于完善基于生态系统服务的社会?生态系统分析理论框架。     

旅游发展背景下乡村空间正义的主体博弈与协商——广州石屋新村案例

以广州石屋新村为案例地,通过深入访谈、参与式观察以及收集文本材料等方式获取素材,运用扎根理论进行编码分析,探讨旅游发展背景下乡村空间正义主体博弈与协商的维度与过程。研究发现：① 乡村空间正义主体博弈与协商的内容主要包括分配正义、居住正义、边界正义和信仰正义4个维度,贯穿4个维度的核心和焦点是权力正义。② 4个维度彼此交织,相互影响,前2个维度呼应了马克思空间正义思想的部分观点,后2个维度是中国语境下的理论创新。③ 乡村转型发展过程中杂糅了政府、企业、村民各自的诉求,导致不同主体展演了多元复杂动态的空间正义博弈与协商过程。     

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ML3.7?????????????????93°?????????????????????С??????????????????????????????????2???????￡????????????????????????????????????????????????????????????????4??2??28??ML3.8?????????λ?????????????????????????????????????????????????????????￡????????????     

Nutrient export via overland flow from a cultivated field of an Ultisol in southern China

Understanding the influence of complex interactions among hydrological factors, soil characteristics and biogeochemical functions on nutrient dynamics in overland flow is important for efficiently managing agricultural nonpoint pollution. Experiments were conducted to assess nutrient export from Ultisol soils in the Sunjia catchment, Jiangxi province, southern China, between 2003 and 2005. Four plots were divided into two groups: two peanut plots and two agroforestry (peanut intercropped with citrus) plots. During the study period, we collected water samples for chemical analyses after each rainfall event that generated overland flow to assess nutrient export dynamics. The concentrations of potassium (K) and nitrate‐N (NO₃^––N) in overland flow were higher during the wetting season (winter and early spring). This reflects the solubility of K and NO₃^––N, the accumulation of NO₃^––N during the dry season and an increase in desorption processes and mixing with pre‐event water caused by prolonged contact with soil in areas with long‐duration, low‐intensity rainfall. In contrast, concentrations of total nitrogen (TN) and total phosphorus (TP) were higher during the wet season (late March to early July) and during the dry season (mid‐July to the end of September or early October). This was due to the interaction between specific hydrological regimes, the properties of the Ultisol and particulate transport processes. Variations in nutrient concentrations during storm events further identified that event water was the dominant source of total nitrogen and total phosphorus, and pre‐event water was the dominant source of NO₃^––N. In addition, the results obtained for the different land uses suggest that agroforestry practices reduce nutrient loss via overland flow. Copyright © 2012 John Wiley & Sons, Ltd.     

Rocking vibrations of a rigid embedded foundation in a poroelastic half‐space

This paper presents an analysis of the rocking vibrations of a rigid cylindrical foundation embedded in poroelastic soil. The foundation is subjected to time‐harmonic rocking excitation and is perfectly bonded to the surrounding soil. The soil underlying the foundation base is represented by a homogeneous poroelastic half‐space, whereas the soil along the side of the foundation is modeled as an independent poroelastic stratum composed of a series of infinitesimally thin layers. The behavior of the soil is governed by Biot's poroelastodynamic theory. The contact surface between the foundation base and the poroelastic soil is assumed to be smooth and either fully permeable or impermeable. The dynamic interaction problem is solved by employing a simplified analytical method. Some numerical results for the nondimensional rocking dynamic impedance and nondimensional angular displacement amplitude of the foundation are presented to show the effect of nondimensional frequency of excitation, poroelastic material parameters, hydraulic boundary condition, depth ratio and mass ratio of the foundation. Copyright © 2009 John Wiley & Sons, Ltd.     

鄂尔多斯盆地及其周边的新构造运动

本区新构造运动十分活跃,表现出多次波动性,周边山系呈不均衡抬升,盆地则呈不均衡沉降,因此使盆地呈现不对称的簸箕状,盆地中的水系结构也呈现不对称性。区内构造变形主要有褶皱、断裂、新隆起、新坳陷、拱曲和掀斜等,并产生现代地震、地热和火山活动。不均衡掀斜是导致上述现象的根本原因。     

SCATTERING PHASE MATRICES OF ICE CRYSTALS WITH HEXAGONAL PRISM AND TRIANGULAR PYRAMID FORM—A VECTOR RAY TRACING METHOD

The work presented previously by the authors(Cai and Liou,1982)has been extended in this paper.By making use of our improved model the calculations on scattering phase matrices of hexagonal prismice crystals(HPIC)have been conducted for monodisperse and polydisperse systems.Compared with themodel of Cai and Liou,the required computational quantity is decreased by about two orders of magni-tude and the errors of results are less for the new model.Meanwhile,the scattering phase matrices of triangularpyramid ice crystals(TPIC)are also computed in the paper,and the comparison between the scatterings of thetwo forms of ice crystals is performed.