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soil ecosystems
    To understand influence of litters on the emission/absorption of CO2, N2O and CH4 in broadleaved /Korean pine forest in Changbai Mountain, fluxes of soil CO2, N2O and CH4 were measured by closed static chamber technique, from Sept 3, 2002 to Oct 30, 2003 in two types of soil ecosystems, of which one was covered with litters on the surface soil, and the other had no litters.
    为研究凋落物对CO2,N2O排放和CH4吸收的影响,从2002年9月3日到2003年10月30日,采用静态密闭箱技术对长白山阔叶红松林两种类型土壤生态系统的CO2,N2O和CH4的通量进行测定。 两种土壤类型分别为表层有凋落物覆盖和没有凋落物覆盖。
    ON BASIN—VALLEY SOIL ECOSYSTEMS OF EASTERN MOUNTAIN AREA IN JI LIN PROVINCE
    试论吉林省东部山地的盆谷地土壤生态系统
    REGIONAL DIVISION OF THE RELATIVE SENSITIVITY OF SOIL ECOSYSTEMS TO ACID DEPOSITION IN HUNAN
    湖南土壤生态系统对酸沉降的相对敏感性区划
    The Effect of Transgenic Plants on Rhizosphric Soil Ecosystems
    转基因植物对根际土壤生态系统的影响
    1. It was observed that P was surplus in the agricultural soil ecosystems in the Taihu Lake region.
    1、太湖地区农田土壤生态系统中的P素平衡状况表现为盈余。
    Associated with the ecological survey of the Tumenjiang River Vally, on-the-spot investigations and observations about the functions of soil ecosysterns were conducted and assessment criteria for the influences of topographic conditions on the function of soil ecosystems in the river valley were put forward, Results obtained showed that (1) The ecological function was weakened with the increase of the altitude;
    在图们江流域生态调查研究中,通过实地调查与观测,提出了对土壤生态系统功能进行评价的客观标准,并制定出地形条件影响土壤生态功能的变量指标。 研究结果表明:1.图们江流域土壤生态功能随海拔高度的增加而减弱。
    The vertical changes of basin-valley soil ecological environm- ents of eastern mountain area in Jilin Provinde lead to the soil ecosystems' changes,that make them appear as different soil ecological unitis according to the relief's difference from the low region to the high region.
    吉林省东部山地中的盆谷地土壤生态环境的垂直分化,导致了盆谷地土壤生态系统按地形从低到高依次分化为不同的盆谷地土壤生态单元:盆谷地河漫沼泽土生态单元; 盆谷地阶地草甸土生态单元;
    Each soil ecological unit of the basin-valley soil ecosystems has its own particular local climates,relief conditions,soil typ- es and resource advantages,therefore,it has a different develop- ing direction from the others'.
    盆谷地中山棕色针叶林土生态单元。 盆谷地土壤生态系统的各个土壤生态单元分别具有各自的地方气候、地形条件、土壤类型和资源优势,因此它们有着不同的经营方向。
    Soil protozoa are an essential component of soil ecosystems because of their high biomass and considerable species diversity.
    土壤原生动物具有丰富的种类多样性和巨大的生物量 ,在土壤生态系统中具有十分重要的地位。
    This paper summarizes the potential influences of vegetation burning on nutrient concentrations,availability and mobility, activities of biomass and enzyme, and soil organic carbon pool in soil ecosystems. The main objective is to provide reference for soil management after forest fire or grassland burning.
    本文对火烧后土壤生态系统中养分的浓度、有效性、迁移性 ,土壤中的生物和酶活性 ,土壤有机碳库等的变化进行了综合评述 ,以期为森林火灾、草地烧荒后的土壤管理等提供理论参考。
    The relative sensitivity of Hunan's soil ecosystems to acid deposition is assessed based on five ecological factors which are parent material, soil acidity and alkalinity, soil type, vegetation type and humidity type.
    以成土母质、土壤酸碱度、土壤类型、植被类型和湿度类型等5个生境因子为基础,建立湖南土壤生态系统对酸沉降的相对敏感性评价指标体系;
    As increasing attention has been paid to below-ground ecosystems in recent years, the impact of exotic plant invasions on soil ecosystems has emerged as a central issue in invasion ecology.
    随着科学家对生态系统地下部分的重视,评价外来植物入侵对土壤生态系统的影响成为当前入侵生态学领域的研究热点之一。
    (b) intensify mechanical studies of the impacts; (c) link the impacts on biodiversity and ecosystem processes; and (d) explore the mutualistic interactions between soil ecosystems and exotic plants.
    今后,加强多尺度和多生态系统的比较研究、机制性研究、生物多样性和生态系统过程的整合性研究及土壤生态系统对植物入侵的反馈研究是评价外来植物入侵对土壤生态系统影响的发展趋势。
    Meanwhile, the risks of ecological safety caused by GM trees have raised attention in the public gradually. These issues mainly include the horizontal transfer and vertical flow of foreign genes, and the potential effects on insects, soil ecosystems and virus.
    但与此同时,转基因林木的生态安全问题也逐渐引起了人们的关注,这些问题主要体现在外源基因的水平转移、垂直流动,以及对昆虫、土壤生态系统和病毒的潜在影响上。
 

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