祁连山冰川:正在远去     

窦贤 《国土资源》2004,(6):36-39

横亘在甘肃与青海交界处的祁连山，在中国西部算不上大山，但由于其特殊的生态作用而成为人们关注的焦点。  相似文献   

河南省公益性地质工作取得可喜进展     

刘成社 《河南国土资源》2004,(8):43-43

2004年，河南省地质调查院共安排各类公益性地质工作项目54项，其中承担国家国土资源大调查计划项目25项，项目总经费2500余万元。通过半年来的工作，在成果、质量、队伍建设等方面取得了显著成果。  相似文献   

虾—鱼—贝—藻多池循环水生态养殖模式的研究     

申玉春  叶富良  梁国潘  向献芬 《广东海洋大学学报》2004,24(4):10-16

建立了一种虾、鱼、贝、藻多池循环水生态养殖及水质生物调控系统 ,该系统包括对虾养殖、鱼类养殖、贝类养殖、大型海藻栽培等 4个功能不同的养殖区 ,1个水处理区及 1个应急排水渠。通过在封闭循环系统内不同池塘中放养生态位互补的经济动植物 ,对虾池水质环境进行生物调控。结果表明 ,循环系统内虾池水层悬浮物数量、COD值、氨态氮含量比对照组单养对虾池明显降低 (t检验 ,P <0 .0 1)。养殖后排放水不处于富营养化状态 (E <1)。投入每千克对虾饲料生产0 .6 6 7kg对虾 ,同时生产 0 .0 37kg罗非鱼、0 .738kg牡蛎、0 .4 37kg江蓠 ,饲料利用率和经济效益显著增加。该养殖模式还具有防病性、环保性、高效性等优点  相似文献   

湖泊富营养化灰色聚类评价及几种评价法比较     

李祚泳  邓新民  李红卫 《成都信息工程学院学报》1990,(1)

本文把湖泊营养化系统看作一个灰色系统,应用灰色聚类法进行营养化评价,并通过实例和层次决策法,Fuzzy-Greey决策法的评价结果进行分析与比较。  相似文献   

整治非法开采为国家重点项目护航     

付利 《河南国土资源》2004,(5):26-26

近日，沁阳市国土资源局会同西气东输豫皖管理处及公安部门联合行动，对太行山区(沁阳市常平乡、西万镇)管道两侧各50米范围内的非法采矿点进行排查、清理，截至4月12日共排查出危及管道安全的非法采矿点69处，已填埋封堵67处，有效地遏制了法采矿行为，确保西气东输管道的安全运行。  相似文献   

Benthic nutrient recycling in shallow coastal waters of the Bohai Sea   总被引：3，自引：0，他引：3  

刘素美张经  陈洪涛T.Raabe 《中国海洋湖沼学报》2004,22(4):365-372

Sediment-water fluxes of N and P species in the Bohai Sea were investigated in September-October 1998 and April-May 1999. The benthic fluxes of nutrient species were determined by incubating sediment core samples with bottom seawater bubbled with air or nitrogen. NO^-2,NH4, dissolved organic nitrogen (DON) and phosphorus (DOP), total dissolved nitrogen (TDN) and phosphorus (TDP), and PO4^3- showed a net exchange flux from seawater to sediment, while NO^-3, dissolved inorganic nitrogen (DIN) and SiO3^2- were released from sediment to seawater in the Bohai Sea. Sediment-water nutrient exchange increases DIN and reduces the phosphorus load in the Bohai Sea. The release of silicate from sediment to overlying seawater reduces potential silicate limitation of primary production resulted from decrease of riverine discharge.The exchange flux of nutrients showed no obvious seasonal variation. The present study showed that the concentrations and composition of nutrients in the water column were affected by suspended sediment, and that not all the exchangeable phosphate in sediment could be released via sediment resuspension.  相似文献   

一月要闻速览     

本刊编辑部 《河南国土资源》2004,(6):47-47

▲由国家发改委、国土资源部等七部门联合制定的《关于对电石和铁合金行业进行清理整顿的若干意见》已经由国务院批准下发。要求地方各级政府对现有和在建(拟建)电石、铁合金生产企业进行全面清理整顿。　　　▲国务院副总理曾培炎在上海、江苏、天津等地考察时强调,各地要把思想和行动统一到中央决策上来,切实服从宏观调控大局,认真做好固定资产投资项目清理工作,加强房地产市场调控,进一步严格土地管理,着力解决经济运行中的突出矛盾。　　　　▲5 月21 日,国土资源部发出通知,要求各级国土资源部门认真贯彻落实国务院办公厅下发的…  相似文献   

Spatial Disparity of Slope Farmland and Food Security in Three Gorges Area   总被引：2，自引：1，他引：1  

WANGLiming FENGRenguo YANGYanfeng GUANQingfeng 《山地科学学报》2004,1(1):89-95

As an important measure of ecoenvironmental construction, the process of de-farming in slope farmland is being undertaken gradually in the whole China. Meanwhile, the problem of reducing in food yield in de-farming areas can not be neglected any more. It is especially the case in areas with concentrated slope farmland and inconvenient transportation. In this paper, we analyze the causes of hidden troubles in food security, and the spatial relationship between farmland and slope farmland in the reservoir area of Three Gorges, and unveil the spatial disparity of contradictions between food supply and demand. Finally, combining the accessibility of areas, three different spatial types of food security, food security area, food alert area, and food crisis area, are divided.  相似文献   

食源性血管紧张素抑制肽（ACEIP）的评价方法     

郝记明  章超桦  郭顺堂 《广东海洋大学学报》2004,24(4):77-81

原发性高血压是由多种因素引起的，其中包括遗传、饮食习惯、精神状态等。对于高血压发病机理，目前尚无一致的看法。研究表明血压正常与否，与肾素-血管紧张素系统(Renin-Angiotensin System，RAS)和激肽释放酶-激肽系统(Kallikrein-Kinin System，KKS)密切相关，而血管紧张素酶(Angiotensin I-Converting Enzyme，ACE)在上述两个系统中都起着重要作用。  相似文献   

Improving Indigenous Technologies for Sustainable Land Use in Northern Mountainous Areas of Vietnam     

LeQuocDoanh HaDinhTuan 《山地科学学报》2004,1(3):270-275

More than 30 ethnic groups are now living in northern mountainous regions, Vietnam, mainly relying on shifting cultivation with the fallow period being shortened from time to time. Naturally, soil fertility reduces from cycle to cycle, entailing the reduction of productivity. Large areas of moderately sloping lands suitable for upland agriculture have become bare after many cultivation-fallow cycles. The soils there have been severely degraded with more toxicity, low porosity, low water retention capacity and poor floral diversity. Normally, these lands cannot be used for food crop cultivation. So farmers in uplands have to rely on slash-and-burn practices for their livelihood. As there is no more forest with good soil in medium slopes, farmers go to cut forests in watershed, high slope lands and old forests up to the mountains‘ top. There are ecologically and environmentally very sensitive areas, so their destruction will inevitably cause hazardous consequences in the whole basin. Meanwhile,cultivation in these areas has low economic efficiency and sustainability because the crop yield may decrease very fast due to severe erosion as the higher the slope, the more serious erosion. Consequently living standards of highland farmers remain low and unstable. Sustainable farming on these lands in the perspective of a seriously deteriorated ecology and environmental is not an easy task. There have been many projects trying to help mountainous farmers get out of their vicious circle. However, due to different reasons, the results gained are low, and in some cases,things ceased to move after the projects phased out. During past few years, based on the farmer experiences, the Vietnam Agricultural Science Institute has cooperated with local and international partners to implement different projects in order to solve the problems by developing simple, easy and cheap cultivation technologies, which can be accepted and applied by local poor farmers for sustainable agricultural production. The first results of our activities offered good opportunities for sustain food production, improve soil health, recharge of aquifers,and enhanced household income for better rural lively hoods in the upland eco-regions of northern Vietnam.  相似文献