我国板栗气候生态区划探讨   总被引：1，自引：0，他引：1  

黄寿波  沈朝栋  郁怡文  曲世鹏 《湖北气象》1998,(3):23-25

通过对中国板栗产量的地理分布、气候生态区划及其对气候条件的要求的探讨、在我国97～122°E、25～40°N的地区均能栽培板栗,但作为经济林果,其主要集中在110°E以东、25～40°N的地区.根据板栗生态气候条件的类似性及地方品种群的分布,可将中国板栗产地划分为6个区,即东北区(Ⅰ)、北方区(Ⅱ)、西北区(Ⅲ)、长江中下游区(Ⅳ） 、东南沿海区(Ⅴ)、云贵区(Ⅵ);Ⅱ、Ⅳ区最适宜板栗栽培,而Ⅰ、Ⅲ、Ⅴ、Ⅵ区,须采取措施使板栗免受气象灾害.  相似文献   

天气概率预报的科学性及其经济实用价值     

杨再位 《气象研究与应用》1998,19(2):23-25

阐明了天气概率预报产生与兴起的科学性、先进性,重点说明了其使用方法及经济实用价值,提出了天气概率预报是人类对天气气候变化具有随机规律性的认识不断深化的结果,它是适应社会需求,提高天气预报效益和社会经济服务效益的重要手段,是天气预报发展的必然结果。  相似文献   

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   

第六届海洋强国战略论坛聚焦环渤海     

金希  屠强 《海洋世界》2012,(12):12-14

11月22日,由中国海洋学会、中国太平洋学会和河北省海洋局共同主办的第六届海洋强国战略论坛在石家庄市隆重召开。本届论坛以"保护渤海环境,推动海洋生态@明建设"为主题,提出举科学之力、聚专家之智,共同探讨海洋强国的战略内涵,探索决策海洋强国的理论,寻求建设海洋强  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   

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   

风光旖旎的莲花湖地质公园     

《黑龙江国土资源》2007,(5):53-53

莲花湖地质公园以峰水为主体，构成公园地貌的骨架，园区内莲花湖主要沿牡丹江河谷分布，是东北最大的人工湖泊，是典型的水体景观。园区内古老的花岗岩形成的地貌景观最为完整典型，具有极高的观赏价值和地质地貌的科研价值，是典型的科研教学基地。  相似文献   

新型知识观下高校旅游管理专业课程知识的构建思考     

黄萍 《成都信息工程学院学报》2007,22(5):658-661

旅游管理专业是1998年新设置的高校本科专业,受学科专业特点和旅游职业需求的影响,其课程知识与传统的学科专业相比,具有很强的实践性.为此,其课程知识的构建,需要深入认识旅游管理专业课程知识的特点,建立起"科学-人本观"的构建价值取向,并充分唤醒教学参与者的主体意识,发挥课堂对课程知识的构建作用.  相似文献   

基于Atmega16的多点温湿度测控系统设计     

权伟  蔡淮  于小娟 《成都信息工程学院学报》2007,22(4):503-508

介绍了基于Atmega16单片机为检测和控制核心,并同多个数字温度传感器DS18B20及模拟湿度传感器HS1101构成温度与湿度的测控系统.给出了系统的总体设计方案、硬件设计及软件框图.所设计的粮情测控系统具有优良的性价比,通过系统软硬件的联合调试说明,该系统可以满足对温湿度及烟雾进行实时监控的需要,具有稳定性好、精度高等特点,有一定的应用价值.  相似文献   

河南省矿产资源潜在价值究竟有多大     

冯进城  杨娜新 《河南国土资源》2007,(4):22-23

所谓矿产资源是指在地质作用过程中形成并蕴藏于地壳内(地表或地下)的有用的矿物或物质集合体,其质和量适合于工业要求,并在现有的社  相似文献