珠江三角洲三水盆地早全新世以来 孢粉分析与古环境重建     

黄康有  何嘉卉  宗永强  郑卓  章桂芳  曹玲珑． 《热带地理》2016,36(3):364-373

为了深入探讨珠江三角洲的沉积古环境和古气候历史,在三水市区获取了2个高取芯率的钻孔岩芯,进行了12个AMS 14C测年,并结合孢粉、硅藻等分析结果探讨三水地区全新世的海平面与河流水动力变化,以及古植被演替过程。结果表明：钻孔所在区域全新世沉积总体从9 000 cal. a B.P.左右开始,呈现河流相―河湾相―河口湾相―潮坪相―河口湾相―河漫滩相的演变过程。三水区的早全新世沉积阶段年代最早为9 000 cal. a B.P.左右,表现为河口湾相的淤泥质粉砂沉积,硅藻以淡水种类为主,最高沉积速率为1.6 cm/a。海侵初始时间为8 700 cal. a B.P.左右,最高海平面时间为7 600 cal. a B.P.左右,此时海岸带发育红树林,丘陵山地发育较茂盛的亚常绿热带常绿阔叶林;中―晚全新世阶段（6 500―2 200 cal. a B.P.）,以泥炭粉砂沉积为主,沉积速率为0.2~0.5 cm/a,河口区高潮线附近及河流弯道低洼滩地在5 000 cal. a B.P.前后形成淡水沼泽、河口三角洲边缘区洼地水松林发育。在晚全新世（2 200 cal. a B.P.左右）以来,陆相黏土质沉积指示河口泥沙快速堆积,三角洲平原迅速扩大,沉积速率高达1.7 cm/a。孢粉结果显示次生的芒箕孢子剧增,陆地植被稀疏,人类活动显著增强。  相似文献   

The ecologically balanced structure of lands and energy efficiency of forestry management in Transnistria     

А. I. Kochurov  N. A. Marunich  Yu. A. Khaziakhmetova  E. V. Krasnov 《Geography and Natural Resources》2017,38(4):394-398

An assessment is made of the natural protection and absolute and relative tension of the ecological-economic state across the territory of Transnistria. Research results point to an ecological imbalance in the region. The situation can be improved by increasing the area of forest ecosystems created according to the natural type. Of particular significance in the optimization of the structure of land resources in the Pridnestrovian Moldavian Republic is an increase in area and improvement of the quality of forest ecosystems and energy efficiency of forestry. The geo-energy approach provides a means of identifying the ways to optimize the functioning of forest ecosystems in Transnistria having regard to an assessment of the ecological-economic balance of the territory. Based on this approach, it is possible to correctly compare different sites and processes, because energy is a universal measure of everything and a universal equivalent of cost. The geoenergy approach has been used to assess energy efficiency of the suggested variant of optimization of the functioning of forest ecosystems for the following components: energy expenditures connected with the means of mechanization, fuel used in the operation of machines and mechanisms, and with labor resources. Based on calculations, we suggest the ways to raise energy efficiency of forestry in unified energy units, joules. The energy potential of forest ecosystems in the republic is analyzed, and energy efficiency of forestry management is predicted. The suggested variant of optimization of the functioning of forest ecosystems will make it possible not only to increase the energy potential of forest and also create valuable high-quality forest stands from the economic and ecological perspective.  相似文献   

Космическое черенковское излучение     

В. М. Чаругин 《Astrophysics and Space Science》1975,37(2):441-447

, . N/E, E _r, (E _r)=1. , (, ) . .  相似文献   

Метагалактические протоны сверхвысоких энергий     

В. С. Березинский  С. И. Григорьева  Г. Т. Зацепин 《Astrophysics and Space Science》1975,36(1):3-15

, . 2.7°- . . . E3×10¹⁹ (1.6) .  相似文献   

Движение малых частиц в окрестностях протосолнца переменной светимости     

Б. ю. Левин  А. Н. Симоненко 《Earth, Moon, and Planets》1981,24(2):245-258

, , , , . , . , () (), , , . — .  相似文献   

地壳局部非均匀性区域附近的应力集中（КОНЦЕНТРАЦИИ НАПРЯЖЕНИЙ ВБЛИЗИ ЛОКАЛЬНЫХНЕОДНОРОДНОСТЕЙ ЗЕМНОЙ КОРЫ）     

М.Х.巴基也夫  Л.А.哈米多夫  А.Х.依布拉基莫夫 《内陆地震》2001,15(4)

Вопросы　связи　напряженно-деформированного　состояния　сейсмоактивных　разломов　с　особенностями　глубинного　строения　Земной　коры　до　сих　пор　находятся　в　зародыше　научного　обуждения．　Можно　назвать　ряд　причин，　сдерживающих　эти　исследования；　а　именно　ограниченность　возможности　математического　моделирования，недостаточные　объемы　геофизической　информации　и　др．　Однако，главная　причина-это　отсутствие　теоретических　обоснований　и　методических　основ　изучения　глубинных　условий　сейсмических　явлений．  相似文献   

Сравнение методов перцева и венедикова гармонического анализа приливных наБлыдений     

Jan Pícha  А. П. Венедиков 《Studia Geophysica et Geodaetica》1965,9(3):230-235

  相似文献   

跨越太平洋的合作--美日预防地震损失策略     

蔡泽尔 《国际地震动态》1999,(5):26-28

在日本神户和美国加州北岭破坏性地震发生后,美国和日本加强了在地震政策方面的合作.1996年4月,"减轻自然灾害活动"成为两个面临全球严峻挑战的国家之间正在进行的美日全球远景规划合作计划(the United States-Japan Common Agenda for Cooperation in the Global Perspective)的一部分.  相似文献   

ДИНАМИЧЕСКИЕ ПАРАМЕТРЫ СИЛЬНЫШ ЗЕМЛЕТРЯСЕНИЙ ПО ДАННЫМ ШИРОКОПОЛОСНОЙ ДЛИННОПЕРИОДНОЙ АППАРАТУРЫ     

З.И Арановиб  А.Я Меламуд  С.И Александров  Axel Plešinger  Josef Horálek  Пеuензенm V. Červený 《Studia Geophysica et Geodaetica》1980,24(2):142-152

Summary The dynamic focal parameters of a series of strong earthquakes, recorded by the FBV broadband velocigraph at KHC (Kaperské Hory, Czechoslovakia), are estimated. The influence of specific wave pattern features on the estimation accuracy is studied. Polarization analysis is used to demonstrate the complicated interference character even of record portions corresponding to a single teleseismic wave group. The values of the dynamic focal parameters do not depend significantly on the length of the analysed record portions and are sufficiently consistent with those reported by Riznichenko [2]. The possibility of estimating dynamic focal parameters from recording of standard classes B (intermediate band) and C (long-period) seismographs is pointed out.  相似文献   

ОЦЕНКА ЭФФЕКТИВНОСТИ РЕГИСТРАЦИИ СЕЙСМИЧЕСКИХ СИГНАЛОВ     

Ю.Н Щтеменко  В.И Цибульский  Речензенm V. Tobyáš 《Studia Geophysica et Geodaetica》1974,18(3):238-247

  相似文献