查询词典 infertile soil

Soil sampled including red soil and yellow soil is obtained from Liping County and is covered by different vegetations such as Phyllostostachys pubescens, Cunninghamia lanceolata (8,12,14,60 years), Shrubs, Broadleaf, Camellia Oleifora Abel, Couch grass and Pine trees.

本论文的研究材料来自贵州省黎平县，分别在红壤和黄壤主要土壤类型上，按照不同人工林，分为毛竹，杉木(8年)，杉木(12年)，杉木(16年)，杉木(40年)，灌木林，阔叶林，油茶，茅草，松树共16个处理。

The results show that soil-root complex still comply with Coulomb's law; root-soil complex cohesion and the incremen in the unit soil content directly proportional relationship, and the root system anchoring role formula is established based on this; Different distribution methods in root has different impact on the shear strength of composite material.

最后，通过有限元分析表明，草根的作用，能够降低浅层土体中的应力水平，即草根能改变浅层土体的应力应变状态；草根增加了浅层土体的粘聚力，对边坡的稳定是有利的。

This text passes correctly elm two of Daqing oil field is united --One Song unite person who bury oil pipeline scene to live in environment survey and study, is it take a sample test , environmental corrosivity survey , corrosivity measuring of pipeline and assess of soil to excavate, is it cause person who bury pipeline antiseptic layers of invalid main factor to find out , confirm the environmental grade of corrosion of soil according to environmental comprehensive physics and chemistry index of soil, grasp pipeline antiseptic invalid law of layer , study antiseptic layers of resistivity decay law and to influence that negative pole protect, is it suitable for person who bury antiseptic layer of life-span of the pipeline calculate formulae and actual effect criterion model to propose on the basis of this text, illustrate and simply analyse oil field long to fail person who bury antiseptic layer of surplus ability to work of the pipeline, unite for elm two --One Song unite pipeline antiseptic maintenance of layer , is it put forward science rational suggestion to change.

本文通过对大庆油田榆二联——宋一联埋地输油管道所处环境的现场调研、开挖取样化验、环境土壤的腐蚀性勘测、管线的腐蚀性检测和评估，找出引起埋地管道防腐层失效的主要因素，并根据环境土壤的综合理化指标确定该段环境土壤的腐蚀等级，掌握管道防腐层的失效规律，研究防腐层电阻率衰减规律及其对阴极保护的影响，在本文的基础上提出适用于埋地管道防腐层寿命计算公式和失效判据模型，例证和浅析油田长输埋地管道防腐层剩余工作能力，为榆二联——宋一联管道防腐层的维修、更换提出科学合理的建议。

Showing fauna composition and ecological geography rule of soil animals as important decomposer group, discussing the intrinsic relationship between environment and soil animals which are considered as stable indication factors of environment, and forming integral fauna list have the vital significance to the development of soil zoology and the ecology

揭示作为重要分解者集团的土壤动物的区系组成及其生态地理规律，探讨作为稳定的环境指示因子的土壤动物与环境的内在关系，形成完整的土壤动物区系名录对土壤动物学及生态学的发展均具有重要意义。

Soil erosion is one of the main environmental problems in the world ,it is the root cause of land deterioration 、 soil fertility degression、 soil physico -chemical quality bad、 land use capability felling and ecological environment deterioration.

土壤侵蚀是世界上的主要环境问题之一，是造成土地退化、土壤肥力下降、土壤理化性质变劣、土地利用率降低、生态环境恶化的根本原因。

In economic development district for example Zhejiang, the function of soil security is gradually weakening because of the soil's income degression, conflict between person and soil, farmer's occupation state changing, etc.

在浙江等经济发达地区，土地的养老保障功能由于土地收入递减、人地矛盾突出和农民就业状况改变等原因已逐渐弱化。

In light of grading analysis test by densimeter method , this paper analyzes and compares the operative method and criterion of test in "The code of soil test" and "The criterion of soil test method" with improved testing operative method, and summarizes a more perfect, effective and accurate testing method, which to offer a reference for soil tester.

针对密度计法颗粒分析试验，对《规程》和《标准》中的试验操作方法和标准与改进的试验操作方法进行了对比分析，总结出一种更为完善、有效、准确的试验方法，供广大土工试验人员参考和采用。

This paper measured the constitutive relation of soil in the condition of the low stain-rate by Split Hopkinson Press Bar technology. It offers the reference for study in high stain-rate in the future. And simulated the explosion between soil and concrete by finite element dynamic analysis software LS-DYNA3D. Finished the numerical simulation for power of exploding between soil and concrete in different position of detonator and different scale model. Set out the curves of displacement, velocity, acceleration and pressure of different position. Obtained the destructibility of concrete target in different explosion condition. It offers data reference for theory studying and engineering designing.

本文首先利用分离式Hopkinson压杆实验技术测定了土在低应变率下的本构关系，为以后进行较高应变率下的研究提供了参考；后面着重利用三维显式非线性有限元动力分析软件LS-DYNA3D对土壤混凝土介质中的爆炸进行了数值模拟，采用土壤混凝土分层介质模型，完成了不同装药位置、不同缩比模型的混凝土模型中爆炸威力的数值模拟，测定了不同情况下的压力曲线及典型位置的质点位移、速度、加速度和压力，得出了混凝土靶在各种不同爆炸条件下的破坏情况，为理论研究和工程设计提供了数据参考。

In order to deep holding the engineering characteristic of the coarse-grained soil, this paper researched object that is the coarse-grained soil of the diametre from 0.1mm to 20mm that was often applied in the dam body filter structure, using the experiment method, carrying out the experiment the research of the coarse-grained soil permeability characteristic.

粗粒土在水力作用下，是一种结构极不稳定的土体，在渗流作用下极易发生渗透变形，容易引起坝体的渗透变形破坏。从渗透系数的变化上分析，其渗透变形过程是一个连续的过程，土体的破坏形式大都属于管涌破坏，破坏坡降较小，一般破坏坡降都小于2.5，有的甚至小于1.0。

Considering different factors, for example ,the variation of the length and the separation of the soil nails, and the diametric of the mixing piles on the strut frame made of composed soil nails is how to affect the stability and deformation of the strut frame made of composed soil nails.

考虑不同的参数，比如土钉长度变化、土钉间距变化、搅拌桩桩径变化等对复合土钉支护结构稳定性以及变形的影响。

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。