ECOLOGICAL SERIES OF SOIL ANIMALS IN DARLIDAI MOUNTAIN   总被引：1，自引：0，他引：1  

HOUWei-ling FANHong 《中国地理科学(英文版)》2002,12(4):378-382

The ecological series of soil animals under the broad-leaved and pine mixed forest in Darlidai Mountainwas studied. Seven sample plots were selected according to different altitude gradients, which belong to different vegeta-tion types. By investigating and analyzing soil animals in every sample plot it is found that there are 45 groups and 1956individuals, which axe involved in 3 phylums, 7 classes, 16 orders, respectively. The altitude is a key factor which af-fects ecological series of soil animals. Both the groups and individuals of soil animals increase with altitude increasingunder certain conditions, which contrastes with ordinary cases, resulting from special micro-climate in studied area. Thegroups and individuls of soil animals are the most under the broad-leaved and pine forest on the top of the mountain, andthe least under Picea-Abies forest in the foot of the mountain.  相似文献   

山东省基本农田保护条例     

《山东国土资源》2004,20(5):1-3

第一章　总则第一条　为加强对基本农田的保护,稳定耕地面积,确保粮食安全,促进农业生产和经济社会的可持续发展,根据《中华人民共和国土地管理法》、《中华人民共和国农业法》、国务院《基本农田保护条例》等法律、法规,结合本省实际,制定本条例。第二条　本条例所称基本农田,是指依据土地利用总体规划确定的不得占用的耕地。本条例所称基本农田保护区是指为对基本农田实行特殊保护,按照法定程序确定的特定保护区域。第三条　本条例适用于本省行政区域内基本农田保护区的划定、保护和监督管理。第四条　县级以上人民政府应当将基本农田保护…  相似文献   

沂水崔家峪玻璃用石英砂岩矿地质特征          下载免费PDF全文

李祥忠  程晓萍  杨学生  解庆岭 《山东国土资源》2004,20(2):34-40

沂水崔家峪玻璃用石英砂岩矿床赋存于早寒武世李官组砂岩段中．呈近水平的层状产出。因其岩石坚硬．矿体呈环山的平台状分布。矿体厚度大，矿石品级高，特级品矿石二氧化硅平均含量98．47％，铁杂质平均含量0．043％(选矿后，铁杂质含量可降至0．02％以下)，为一优质玻璃硅质原料矿床。矿石为细一中粒石英砂岩，粒度以中粒为主，矿石由碎屑颗粒和胶结物组成，碎屑成分含量为97％～98％．其中绝大部分是石英颗粒．具典型的砂屑结掏。该矿床属滨海陆源沉积矿床。  相似文献   

康南滇北间之河流袭夺现象     

崔克信 《地质论评》1948,13(Z2):286-286

西康南部以及云南北部之区河流因袭夺而改道之现象至为普遍,如金沙江鸦龙江大渡河以及理曲等均有明显之改道现象,由改道附近  相似文献   

辽东半岛南部寒武系与奥陶系界线     

王敏成 《国土资源》1990,(1)

笔者(1989)在辽东半岛南部复州湾和金县七顶山寒武系与奥陶系界线附近发现一层笔石,它们为:Airograptus furciferus,Staurograptus sp.,Dendrograptus sp.,并且建立了 Airograptus furciferus-Staurograptus 带,该带相当于华北的 Dictyonema flabelliforme-Staurograptus 带,相当于华南东南区的Staurograptus-Anisograptus 带,其层位相当于英国的特马豆克阶。由于该区寒武系顶部已建立了笔石带Dictyonema kelanense 带,因此,笔者将辽东半岛南部寒武系与奥陶系界线划在 Airograptus furciferus-Staurograptus 带与 Dictyonema kelanense 带之间。  相似文献   

山东金伯利岩与伴生煌斑岩的关系     

邹日  王公庆 《长春地质学院学报》1992,22(2):157-161

  相似文献   

胶东“玲珑-焦家式”金矿资源潜力与找矿   总被引：1，自引：1，他引：0  

李士先  王建收 《山东国土资源》2006,22(12):36-41

“玲珑焦家式”金矿的成岩成矿,从新太古代至中生代存在着继承性的成因关系,成矿具有长期性、多源性特点,但中生代燕山早期岩浆活动是主导成矿因素。区域化探成果显示胶东金矿直接矿源岩———郭家岭花岗岩金的丰度比原始矿源岩———早前寒武纪变质沉积岩系及侵入岩系金的丰度低1/2。郭家岭花岗岩面积在2 km2以上岩体定量估计金亏损总量与胶东金矿总量预测的资源量相当,从一个侧面展现了胶东金矿资源的潜力。望儿山金矿的找矿实践展示,焦家式金矿在1 000 m以下尚有巨大潜力,整个胶东金矿产区在3 000 m以上的资源潜力应在5000 t以上。  相似文献   

ANALYSIS OF DRIVING FORCES ON THE CHANGE OF HISTORICAL FARMLAND USE IN SHANDONG PROVINCE DURING THE QING DYNASTY （1644-1911）     

ZHANGXue-qin GEQuan-sheng ZHENGJing-yun 《中国地理科学(英文版)》2003,13(3):207-215

How land-cover has been changed by human use over the last 300 years is one of the five overarching questions guiding the Land-use/Cover Change (LUCC) Science/Research Plan. China has variety of historical docu-ments providing unique data superiority. So the characteristics of farmland area in Shandong Province during the Qing Dynasty (1644-1911) are summarized firstly: 1) the rising trend of farmland area was striking; 2) farmland area had re-markable fluctuation; 3) farmland area per capita decreased dramatically; 4) wasteland reclamation index increased rapidly. Then, the driving forces of farmland area change are analyzed. It is concluded that natural and human factors are jointly influential. Among the driving forces, human dimensions are the main factors of farmland area change,which direct the general tendency of the changes mentioned above. And the natural factors influence the stability of farmland area as well. Variation of the natural factors would act as the major contributory factor to farmland area change during years or periods of abrupt climatic changes, or during the intensive occurring periods of natural hazards.Besides, the passive aspects of human factors, such as war chaos also influenced the fluctuation of the farmland area.This research indicates that it is feasible to study the land-use/cover change by Chinese historical literatures, which has huge potential to provide a comprehensive picture of the growing dominance of human land-use and land-cover pat-terns that can be used in many global change research oroiects.  相似文献   

商州市石英脉型金矿地质特征及找矿方向研究   总被引：1，自引：0，他引：1  

魏刚锋张维吉  王力群袁速成 《长安大学学报(地球科学版)》2003,25(3):24-28

商州市金矿区位于北秦岭造山带与中秦岭造山带接合部的北秦岭南部边缘。该区含金石英脉型金矿均产于中元古界武关岩群控矿韧性剪切带之中。受左行剪切作用控制呈雁行状排列的单条含金石英脉中金矿构造透镜体规模小、品位低、间隔大而不利于机掘开采。同一条控矿韧性剪切带内发育走向相同，倾向相反，含金石英脉交汇部位矿体变厚，品位增高，因而是成矿有利地段。深大断裂附近出露的构造蚀变岩带有一定找矿潜力，建议加强基础地质研究，以发现构造蚀变岩型金矿体。  相似文献   

山东内生金矿矿床谱系及其致矿地质异常          下载免费PDF全文

徐金芳 《山东国土资源》2001,17(2):32-36

矿床谱系是对成矿多样性的理论概括,而成矿多样性又是由不同级别、不同性质的致矿地质异常决定的.本文论述了山东省内生金矿矿床谱系及其致矿地质异常.  相似文献