武夷地块北东部迪口地区下元岩体和红叶岗岩体锆石La-ICP-MS U-Pb年龄及其地质意义

迪口地区的下元岩体和红叶岗岩体位于武夷山地区东、西武夷俯冲碰撞增生杂岩带(450～440 Ma)中。我们对下元岩体中的三个岩石样品进行了锆石La-ICP-MS U-Pb测年,获得岩体的侵位结晶年龄分别为420±4 Ma、430±4 Ma和434±4 Ma,证明该岩体为加里东岩体,而非早期认为的印支期花岗岩。红叶岗岩体进行La-ICP-MS锆石U-Pb测年获得的年龄为398±4 Ma,表明红叶岗岩体为加里东晚期岩体,而非前人认为的燕山期花岗岩。结合武夷山地区最新的研究成果分析,我们认为迪口地区下元岩体和红叶岗岩体可能形成于东、西武夷地块碰撞后拉张裂解环境。迪口地区下元岩体和红叶岗岩体的侵位时代为武夷地块加里东期的构造演化提供了更进一步的时代约束。     

中国荒漠类自然保护区保护成效评估指标及其应用

自然保护区的保护成效是近年来一个重要科学问题。中国荒漠类自然保护区面积比例较高,而针对其保护成效问题的研究较少。本文以中国荒漠类自然保护区为研究对象,结合国内外自然保护区保护成效的相关研究,构建了荒漠类自然保护区保护成效评估指标体系,包括5个因素层共计20个评估指标,并在安西极旱荒漠国家级自然保护区进行了示范应用。结果表明:本研究构建的指标体系能够反映荒漠类自然保护区主要保护对象的动态变化,从而为科学客观评估荒漠类自然保护区保护成效、提升管理水平提供重要参考依据。此外,通过示范评估可以看出,安西保护区在物种及珍稀濒危生物保护方面取得了一定成效,但在珍稀濒危及特有物种和生态系统服务功能等方面的科研监测尚有待加强。     

Economic sustainability of China’s growth from the perspective of its resource and environmental supply system: National scale modeling and policy analysis

Since the implementation of the economic reform and opening up policy in 1978,China has miraculously created long-term high-speed economic growth,but has also had to face the problem of excessive consumption of resources as well as an intensification of en-vironmental pollution.As a result,China is now facing a slowdown in development.China must maintain a certain speed of development to realize its goal of being a powerful nation,and becoming a developed country by 2050.To this end,China is facing a transformation of its economic development.There is a need to agree on an expected economic growth rate,along with the corresponding development modes or means of regulation in the medium-and long-term periods.This study developed a systematic-dynamic model to simulate the cou-pling relationship between economic growth,development modes,and the environmental supply system,and explored the possible options for future economic growth as well as the resource use and environmental protection requirements (the main factors).The results showed that to achieve the development goal of becoming a developed country by 2050,while maintaining a good ecological environment,the suitable growth rate for China's econ-omy is 3.8％-6.3％.Within this range,a growth rate of 3.8％-4.4％ was found to be relatively safe,while a growth rate of 4.4％-6.3％ required further technical progress.This study pro-vides an early warning in regard to China's environmental and development status.The study was a response to the "Future Earth" framework document and,in terms of development speed,it developed a theoretical system for the determination of resource and environmental carrying capacity (RECC).     

A Case Study for a Digital Seabed Database： Bohai Sea Engineering Geology Database

This paper discusses the designing plan of ORACLE-based Bohai Sea engineering geology database structure from requisition analysis, conceptual structure analysis, logical structure analysis, physical structure analysis and security designing. In the study, we used the object-oriented Unified Modeling Language （UML） to model the conceptual structure of the database and used the powerful function of data management which the object-oriented and relational database ORACLE provides to organize and manage the storage space and improve its security performance. By this means, the database can provide rapid and highly effective performance in data storage, maintenance and query to satisfy the application requisition of the Bohai Sea Oilfield Paradigm Area Information System.     

泰安市山水林田湖草生态修复区废弃露天矿山治理模式与技术体系研究

露天矿山对区域土地与环境产生了复杂多样的负面影响,已成为生态系统修复等方面研究解决的焦点问题。本文分析、诊断、识别了废弃露天矿山修复目标、存在问题及特征,归纳总结了常用的治理模式;厘清了废弃露天矿山治理思路与方法,创新构建了更具针对性、实用性的技术体系;针对废弃露天矿山典型现状,归纳总结出研究区几种典型修复方法。旨在为泰安市山水林田湖草生态修复区废弃露天矿山生态修复治理提供技术参考,同时,对我国类似矿山开采区的恢复治理工作也具有一定的借鉴意义。     

Tectonic implications of the subduction of the Kyushu-Palau Ridge beneath the Kyushu,southwest Japan

The Kyushu-Palau Ridge(KPR), a remnant arc on the Philippine Sea Plate(PSP), is subducting beneath the Kyushu, southwest Japan. Influenced by the subducting KPR, the Kyushu subduction zone corresponding to the KPR is significantly different from Shikoku subduction zone in terms of gravity anomalies, seismicity, the stress state, and the subducting slab morphology. Significant negative free-air and Bouguer gravity anomalies are observed in a prolonged area of KPR, southeast of the Miyazaki Plain, indicating that this is where KPR overlaps the overriding plate. The gravity anomaly in this area is much lower than that in other areas where the inferred KPR extends, suggesting that the subduction of the buoyant KPR may cause the lower mantle density to decrease.More earthquakes have occurred in Hyuga-nada region where the KPR subducts than in Shikoku forearc and other areas in the Kyushu forearc, indicating that the subduction of the KPR enhances the local coupling between the subducting and overriding plates. The centroid moment tensor(CMT) mechanism of earthquakes shows that stress is concentrated in the accumulated crust beneath the Kyushu forearc corresponding to the KPR, and the shallow thrusting events in the obducting plate are caused by the KPR subduction. The buoyant KPR, with a large volume of low-density sediments, was responsible for the differences of the subduction depth and dip angle of the subducting Philippine Sea(PS) slab between northern Kyushu and Shikoku. The seismic gaps and the sudden change of the dipping angle of the subducting PS slab indicate that slab tear may have occurred along the west side of the KPR beneath southwest Kyushu. A two-tear model was proposed, and the subduction of the buoyant KPR was believed to play an important role in the slab tear.     

中国北方沙尘天气气象场的数值模拟

利用PSU/NCAR的非静力中尺度气象预报模式MM5对北方地区气象场进行模拟,通过对2001年3月21日发生并影响北京地区的沙尘过程的数值实验表明,该模式能够较好地模拟和预测北方沙尘天气的时空演变特征。低值系统以及其低层辐合、高层辐散的垂直结构,可以产生很强的上升气流,形成地面起沙和沙尘上扬,而强风是沙尘输送的动力条件。利用轨迹模式对空气质点轨迹进行了模拟研究,可以较好地反映沙尘的发生源区和输送路径,与卫星监测和天气系统分析是一致的。并编写软件用于演示气象场的动态效果。     

A Novel Approach to Range Doppler SAR Processing Based on Legendre Orthogonal Polynomials

The range Doppler algorithm (RDA) is based on Taylor series expansion for the transfer function (TF) phase component, resulting in increasing phase error as the range frequency or the squint angle increases. We introduce Legendre orthogonal polynomials into synthetic aperture radar data processing steps to replace Taylor series expansion used in approximating the TF phase. A novel range Doppler imaging approach based on Legendre expansion is addressed with an extended RDA as example, and the analytical expressions of the new phase multiplication factors are then derived. The simulation results show that the proposed method provides better focusing performance than the conventional RDA in the same squint case and is more suitable for the large squint mode while there is negligible increment of computation load.     

南极布兰斯菲尔德海峡区域重力场特征及异常分析

南极布兰斯菲尔德海峡及周边区域是南极大陆火山、地震等新构造活动最活跃的地区,与南设得兰海沟、南设得兰群岛一同构成南极大陆边缘现存唯一的"沟-弧-盆"构造体系。本文基于"雪龙"船第28、第30航次实测数据及两个航次的国际共享资料,利用均衡改正数据处理方法获得布兰斯菲尔德海峡的莫霍面深度及其分布规律,分析深部构造-断裂的区域分布及其重力异常特征等。布兰斯菲尔德海峡内的空间重力异常呈条带状分布,走向总体与地形相近,布格重力异常则由两侧向中间升高,大致在坡折处形成异常场值为100×10-5 m/s2的分界线,在中央次海盆和东部次海盆海山处形成两个异常高值圈闭,异常值最高为150×10-5 m/s2。莫霍面深度以弧后扩张中心为最低值,向南设得兰群岛和南极半岛两个方向递增,深度从12 km递增至陆坡位置的24 km。     

最大矩阵元及模糊识别法在大区域地下水水质分区中应用

本文应用最大矩阵元与模糊识别相结合的办法,较理想的解决了大区域地下水质量分区问题。该法不仅克服了最大矩阵元法分类的随意性,也克服了其它分类方法中因分类标准(λ值)的不确定性带来的分类困难,并达到了地下水样本分类与质量定级同步完成的目的。