自然灾害的防御     

江切米洛  崔桂芝 《地震科技情报》1992,(7):8-9

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内蒙古正镶白旗碎斑熔岩地球化学特征   总被引：2，自引：0，他引：2  

赖绍聪  徐海江 《地球化学》1992,(1):86-94

白旗碎斑熔岩是一种特殊成因的火山岩,属太平洋岩系钙碱质系列火山岩。以富亲石微量元素为特征。稀土配分属铕亏损且轻稀土富集型。形成白旗碎斑熔岩的原始岩浆来自于地壳深部,乃是上地幔与地壳共同混熔分异的产物。  相似文献   

参加湄州湾国土规划工作的几点体会     

江振扬 《中国地质》1988,(4)

湄州湾位于福建省沿海中部,距福州100多公里,离厦门200多公里。一般水深10～20米,深者30～40米,区内无大的河流,淤积物质来源甚少,湾外有三道屏障,陆地上分布有岩浆岩、动力变质岩低丘,风化的红土台地,海积洼地。总的看,自然地理条件优越,已列入国家“七五”规划重点经济建设地区,将成为我国新的深水大港和福建省的重工业基地,新的港口工业城市。  相似文献   

甘肃洮河岸边黄土-泥岩顺层滑坡     

吴玮江 《中国地质灾害与防治学报》2006,17(1):35-35

黄土-泥岩顺层滑体主要由第四系黄土及第三系或白垩系泥质岩等组成。此类滑坡在陇中黄土高原地区广泛分布，一般为大、中型滑坡。滑动面多沿倾向坡外的泥岩软弱层理面及夹层发育，主滑面平直。受岩层产状控制，倾角一般为10—20。。上部黄土中形成为拉裂面，较陡直。黄土-泥岩顺层滑坡的变形坡坏方式多为滑移一拉裂型或滑移-挤压-拉裂型。多具滑速低、滑距小、复活性强的特点。  相似文献   

Methane and Nitrous Oxide Emissions from Three Paddy Rice Based Cultivation Systems in Southwest China   总被引：4，自引：0，他引：4  

江长胜  王跃思  郑循华  朱波  黄耀  郝庆菊 《大气科学进展》2006,23(3):415-424

To understand methane (CH4) and nitrous oxide (N2O) emissions from permanently flooded rice paddy fields and to develop mitigation options, a field experiment was conducted in situ for two years (from late 2002 to early 2005) in three rice-based cultivation systems, which are a permanently flooded rice field cultivated with a single time and followed by a non-rice season (PF), a rice-wheat rotation system (RW) and a rice-rapeseed rotation system (RR) in a hilly area in Southwest China. The results showed that the total CH4 emissions from PF were 646.3±52.1 and 215.0±45.4 kg CH4 hm-2 during the rice-growing period and non-rice period, respectively. Both values were much lower than many previous reports from similar regions in Southwest China. The CH4 emissions in the rice-growing season were more intensive in PF, as compared to RW and RR. Only 33% of the total annual CH4 emission in PF occurred in the non-rice season, though the duration of this season is two times longer than the rice season. The annual mean N2O flux in PF was 4.5±0.6 kg N2O hm-2 yr-1. The N2O emission in the rice-growing season was also more intensive than in the non-rice season, with only 16% of the total annual emission occurring in the non-rice season. The amounts of N2O emission in PF were ignorable compared to the CH4 emission in terms of the global warming potential (GWP). Changing PF to RW or RR not only eliminated CH4 emissions in the non-rice season, but also substantially reduced the CH4 emission during the following rice-growing period (ca. 58%, P<0.05). However, this change in cultivation system substantially increased N2O emissions, especially in the non-rice season, by a factor of 3.7 to 4.5. On the 100-year horizon, the integrated GWP of total annual CH4 and N2O emissions satisfies PF>>RR≈RW. The GWP of PF is higher than that of RW and RR by a factor of 2.6 and 2.7, respectively. Of the total GWP of CH4 and N2O emissions, CH4 emission contributed to 93%, 65% and 59% in PF, RW and RR, respectively. These results suggest that changing PF to RW and RR can substantially reduce not only CH4 emission but also the total GWP of the CH4 and N2O emissions.  相似文献   

特大伏旱袭川     

姜永育  杨有国 《四川气象》2006,26(3):F0003-F0004

2006年，四川省遭受了有气象纪录55年以来最严重、最极端的一次高温伏旱。伏旱从盆地中、东部的部分地方开始发生，并迅速向南、向西发展。8月上旬，伏旱迅速扩展到全省大部分地方，14日伏旱持续范围达到了顶峰。截止8月23日，全省共有112个县(市)先后发生伏旱，主要分布在盆地  相似文献   

新加坡中学地理选修课教材简析     

盛丽芬  江晔 《地理教学》2006,(11):33-36,32

2001年SNP（新加坡国家印刷集团）泛太平洋出版社专为中学较高年级的学生设计了《互动的地理（选修课）》教材。与其说该教材是紧扣学生即将面临的普通教育文凭普通级和初级水平的考试，不如说是力图将学生塑造成令人满意的合格的社会国民。本文试分析该教材特点，以期给我们的地理课程教材改革有所启示。  相似文献   

泗滨砭石的矿物组成特征及其与砭石理疗功能的关系   总被引：2，自引：0，他引：2  

谢先德  王辅亚  孙振亚  谢楠柱  劳沛良  江潔慈  王英 《矿物岩石地球化学通报》2007,26(Z1)

砭石疗法是我国古代具有悠久历史的医疗方法,具有疏通经络、条理气血等理疗功效,在《黄帝内经》中砭与针、灸、药、按蹻等并列为中医的五大医术.砭石疗法自东汉起失传.20世纪90年代,在岩石物理学家和中医专家的共同努力下,在山东泗水之滨重新发现了砭具佳石--泗滨砭石,提出了新砭石疗法[1-2].  相似文献   

藏北羌塘盆地菊花山地区晚三叠世古岩溶不整合面的发现及其意义   总被引：1，自引：1，他引：1       下载免费PDF全文

陈文西 王剑汪正江  付修根 《地质论评》2007,53(5):699-703729

菊花山地区出露的肖茶卡组—那底岗日组,其接触关系清楚,是北羌塘盆地代表性的剖面。在对该剖面中两者之间的砾岩进行详细的野外观测和分层取样分析的基础上,确定了肖茶卡组顶部与那底岗日组底部之间的砾岩为上、下两套不同成因、不同性质的砾岩组合。下套角砾岩以钙质、铁泥质胶结为特征,是肖茶卡组沉积期后海平面下降,出现广泛暴露、风化溶蚀形成的岩溶角砾岩;上套砾岩以凝灰质胶结为特征,是岩溶角砾未固结之前,发生构造活动产生的火山碎屑、熔岩流携带、搬运松散岩溶角砾再次沉积形成的那底岗日组底砾岩。从而确定了肖茶卡组与那底岗日组为岩溶不整合接触关系。该岩溶不整合面是羌塘盆地构造演化分析的重要证据,也是油气勘探的重要标志层。  相似文献   

九江地震灾害分析和鉴定加固研究     

杨忠  江德保 《华北地震科学》2007,25(3):42-46

分析了九江地震灾害特征和产生灾害的原因,提高了对建筑抗震设计重要性的认识,同时针对旧房改造和重建,结合新农村建设,提出了建筑物抗震鉴定和加固方法,为本地区的抗震设防提供一点参考和借鉴.  相似文献