查询词典 protective forest

In this treatise, the Huangfengqiao forest farm in Youxian county is taken as the research object. The applications of artificial neural network in forest management decision-making are discussed, including forest resources prediction and site quality evaluation.

本论文以攸县黄丰桥林场作为研究对象，初步探讨了人工神经网络方法在森林经营决策中的应用，包括在森林资源预测以及立地质量评价中的应用。

The soil and water losses are very light and its difference is not notable in woodland of different tillage mode of economic forest, relatively the soil and water losses is lighter hi protecting slope model than in clearing model in low crown density benching economic forest such as Chinese chestnut, but the soil and water losses is lighter in clearing model than in protecting slope in high crown density benching economic forest such as bayberry.

不同耕作模式成年经济林地水土流失情况都较轻微，差异性不显著。相对而言郁闭度小的经济林如板栗林地台地护梯方式要比台地清耕方式好，郁闭度大的经济林如杨梅林地台地清耕方式要比台地护梯方式好。

Annual supply, demand, profit and loss of EF (1995-2005) for Tianjin were calculated based on MEFM. Per capita Ecological Footprint of arable land, pastureland, forest land, water area and fossil-energy land were 0.0009,-0.3224,-0.1991, 0.0255,-1.9600 hm^2cap^(-1) respectively. The deficit of PEF for pastureland, forest land and fossil-energy land increased annually except that the PEF for forest land and water area increased a little. During the period of 1995-2005, higher energy consumption of per unit production, accretions of population and built-up area were the main factors to the increasing of PEF deficit for Tianjin.

利用改进后的生态足迹模型计算天津市1995-2005年的生态足迹及其动态变化值，天津市耕地、牧草地、林地、水域和化石能源用地人均生态足迹盈亏分别为0.0009，-0.3224，-0.1991，0.0255，-1.9600hm^2人^(-1)，除耕地和水域略有盈余外，牧草地、林地和化石能源用地人均生态赤字均呈递增趋势。1995-2005年间天津市单位产值能耗居高不下、人口规模增长与建筑用地扩张是导致人均生态赤字扩大的根本原因。

In this study, we take severely soil eroded land, ban forest (as the control I ecosystem after planting Pinus massoniana and baned) and a mixed forest of Cunninghamia Lanceolata plantation and Pinus massoniana (as the control II ecosystem after planting a mixed forest of Cunninghamia Lanceolata plantation and Pinus massoniana and taking engineering restoration measurement)for study.

本文以未治理的侵蚀地作为对照，以在侵蚀地上营造马尾松并封禁管理以及通过工程措施后种植杉木—马尾松混交林为研究对象，通过野外观测和实验室分析，研究了不同恢复措施对土壤结构、土壤化学性质、群落生物量、植物养分、生物多样性的影响。

The forest parks on the Qinling Mountain′s north slope are the mainly area for forest recreation industry in Shaanxi province. Forest recreation value is one of non-market products, a new method for value estating need to be exploied.

根据秦岭北坡森林公园为陕西省森林生态旅游活动的主体，而森林公园游憩价值又是非市场性的，这就需要探索新的方法来进行计量测评。

The results indicate that:(1)Compare with the comparion, the soil physics character are improved after vegetation restortion , the soil unit weight in cyclobalanopsis glauca, Pinus elliottii, Robinia pseudoacacia , mixed forest and fire slash shrub separatly are 1.525g/cm~3, 1.426 g/cm~3, 1.625 g/cm~3, 1.482 g/cm~3, 1.423 g/cm~3. We can find the soil unit weight in other forest all bigger than the comparion (1.580 g/cm~3) except Robinia pseudoacacia .All these mean forest soil is looser and better capacity for aerated and dank.

结果表明：(1)植被恢复后林地土壤物理性质有良好的改进，青冈、湿地松、刺槐、混交林、火烧迹地灌丛容重分别为：1.525g/cm~3、1.426g/cm~3、1.625g/cm~3、1.482g/cm~3、1.423g/cm~3，除刺槐外其他林地均低于对照(1.580g/cm~3)，上述几种林分的孔隙度分别为：45.872%、51.956%、44.093%、50.485%、55.648%、47.228%，说明林地内土壤较对照更为疏松、通气透水能力更强，更有利于土壤微生物的活动，为研究区土壤肥力的提高奠定了基础。

The quality and composition of the pine forest and oak forest were highly similar while the relationship between the composition of light and the canopy characters varied with forest types.

3光资源的数量及其组成在油松林和辽东栎林下的变化非常相似，但光资源的组成与林冠特徵的关系在两种森林间存在差异。

And there are bigger distinctions on the definition of forest resource , the right of ascertaining forest type , the rule of legal responsibility and other about the basic forest protection law of two country .

而且，两国的森林保护&基本法&在森林资源的定义、森林种类的确定权限、在法律责任的规定等方面也有较大的差异。

Originally a forest-dwelling animals, due to changes in the environment to survive were forced to Shimoji food, living in the forest, open space or forest grassland transition zone.

原为林栖动物，因生存环境的变化被迫下地觅食，生活于林间空地或森林草原交接地带。

From 6860 to 3170 cal.yr BP,semi-desert steppeexpanded,regional montane forest steppe retreated,suggesting a prolonged warm and dryclimate.Between 3170 and 2340 cal.yr BP,regional forest steppe expanded whereassemi-desert steppe retreated,indicating the climate became cool and wet gradually and thehumidity reached the maximum at the end of this stage.During 2340～1600 cal.yr BP,Poaceae steppe dominated whereas wetland meadow expanded and the montane forest stepperetreated,suggesting a cool and wet climate prevailed,wormwood grass steppe prevailed andthe climatic instability increased after 1600 cal.a BEThe climate and environmental reconstructions by pollen were supported by the diatomrecords.A relative high lake level and moister climate prevailed between 8660 and 7230 cal.yr BP as inferred by the dominance of planktonic diatom genera and high planktonic/benthicratio (〉40).low lake level and dry climate sustained during 7230～2330 cal.yr BP assuggested by the low abundance of planktonic diatom and low planktonic/benthic ratio ～20and the lake returned to high level during 2330～930 cal.yr BP as inferred by there-dominance of the planktonic diatom and the high value of palnktonic/benthic ratio.The pollen-based climate reconstruction was also consolidated by the grain size andPediastrum concentration records.

Ugii Nuur湖周围现代孢粉研究表明：松属为空气传播的外来花粉，其含量变化可能指示了远山森林草原发育状况；禾本科具显著低代表性，母体植物建群时含量通常在10％以下：藜科花粉含量可以指示区域气候干旱程度。2、以现代孢粉研究为基础、可靠AMS~(14)C年代为框架，Ugii Nuur孢粉记录高分辨率地重建了蒙古国中部地区过去8660 cal.yr BP以来的植被和气候变化。8660～7800 cal.yr BP研究区植被为禾草草原，湖畔及河谷低地发育苔草草甸，远山发育松属针叶林和森林草原，气候温和略湿润；其中8350～8250 cal.yr BP湿生草甸扩张，旱生植物成分减少，气候凉湿。7800～6860 cal.yr BP旱生成分增加，气候转向暖干。6860～3170 cal.yrBP半荒漠草原扩张，远山森林草原退缩，山地草原和河谷及湖畔湿生草甸退缩，气候持续暖干。3170～2340 cal.yr BP半荒漠草原退缩，远山森林草原扩张，气候转凉变湿，末期湿度条件达最佳。2340～1600 cal.yr BP禾草草原发育，湖畔及河谷低地湿生草甸扩张，远山森林草原略有退缩，气候总体较凉湿。1600 cal.yr BP以来研究区发育禾草-冷蒿草原，气候波动较大。

You can snipe the second and third union leaders from this position.

您可以鹬第二和第三工会领袖从这一立场出发。

Aiming at the currently shortage of XML streams quality detecting, this paper proposes a new forecasting method of XML streams quality by least squares support vector machines, which is used the method of XML keys' vector matrix as windows, and vector product wavelet transform to multilevel decompose and refactor the XML streams series, that can fulfill real-time checking demand of XML quality, and ensure constraint, consist- ency and integrality. For even more adapting net load, it proposes a control strategy by weight and adaptive adjustment to ensure XML streams quality.

针对当前XML数据流质量检测存在的不足，提出构建XML键的矢量矩阵作为窗口，利用矢量积小波变换多级分解与重构XML数据流，再结合最小二乘支持向量机对XML数据流质量进行预测的一种方法，满足XML数据流质量重构时实时检测的要求，保证XML数据的约束性、一致性与完整性；为了更好的适应网络负载，采取加权与自适应窗口调整等调度策略充分保证XML数据流的质量检测。