查询词典 infertile soil

Soil temperature is an important parameter in the processes of land and atmosphere interaction, and soil thermal diffusivity is an important soil property.

土壤温度是气－地交互作用过程中的一个重要变数，而土壤热扩散系数为土壤温度变化的一个重要因子。

The results indicated that the soil physical fertility characteristic of super high-production cornfield was high, mainly display in the topsoil was deep, soil bulk density changed between 1.01-1.26 g/cm3, disarrangement rate of soil structure was...

研究结果表明，超高产玉米田土壤物理肥力特性较高，主要表现在耕层较深厚，土壤容重变化在1.01～1.26g/cm3，土壤的结构破坏率较低；在土壤的化学环境特征方面，土壤碱解氮、速效磷、速效钾等均未表现出明显的变化规律；所有超高产田的土壤阳离子交换量均不同程度地高于普通生产田，这与超高产田的定向培育有直接关系；一些超高产田有机质低于普通生产田，其原因与超高产田氮素施用量较高、促进了土壤有机质矿化有关。

The results of experiments and analysis shown that the clay mineral is mainly gerundive, montmorillonoid is little, but a great quantity of sodium-ion in gerundive soil and larger pH make the soil as well as montmorillonoid which is intense dispensability, These are two keys for the soil to disperse.

试验和分析结果表明，土样中的粘土矿物主要以伊利石为主，蒙脱石含量较少；伊利土中含有大量的钠离子，使得伊利土象钠蒙脱土一样具有强分散性；pH值较高，使得土壤颗粒之间的净势能表现为斥力，这也促使土样土样产生分散性。

Study on the relationship between soil fertility properties and species diversity in grass layer showed that the main factor affecting species diversity was soil PH, then was the soil total phosphorus.

4对防护林草本层物种多样性指数与土壤肥力因子的关系研究表明：影响草本层物种多样性的主要因子是土壤PH 值，其次是土壤全磷含量。

Results showed that more than 72% PAH at soil/oil ratio of 1:1 was removed from high (200 mg/Kg) and low (50 mg/Kg) PAH contaminated soil with the equilibrium time 24 h. It was estimated that soybean oil can remove more than 70% PAH from 4200 mg/Kg contaminated soil. If a sequence of double extraction of the

结果显示，土壤和大豆油於 1：1 比例，平衡时间为 24 小时条件下，对於 anthracene (50， 200 mg/Kg)土壤脱附效率皆为 72%，计算萃取 4200 mg/Kg 的污染土壤，其萃取效率仍可维持於 70%优於 SDS、TX-100、Tween 80 等界面活性剂。

In this paper, the spatial distribution of soil erosion intensity on a long and straight cultivated slope was studied using 137Cs measurement and wavelet analysis. The results showed that there existed an fluctuant period of soil erosion intensity with 142m along 4 transects downslope, which suggested that the intensity of soil transporting changes between weak and strong alternately downslope during the impact of long-term erosive rainfall.

本研究通过采集开垦近100年的黑土直型坡耕地的土壤样品，利用137Cs示踪技术，结合小波分析方法，研究了长坡长直型坡耕地50多年来土壤侵蚀强度的空间变化规律，结果显示4个断面顺坡方向上的坡面侵蚀强度均存在着坡长为142 m的强弱交替变化的波动周期，这反映了长坡长直型坡土壤在长期的降雨侵蚀过程中，泥沙沿坡面输移的强弱交替变化。

To put it briefly, they think water and soil conservation only make soil, stone and dreg fixed, in another word, not allow it take place displacement, it doesn't deeply prevent land from degrade in the land care that make the guidelines of the projects, the measure adopt in water and soil conservation, etc.

简单的说，认为水土保持仅仅是把土、石、渣固定下来，即不让其发生位移，没有深入到防止土地退化方面的土地保育，使得方案的指导思想、采用的水土保持措施等与水土保持的根本目的相去甚远。

The appropriate dripper discharge should be selected for different soil texture and climatic conditions. In this paper, the laws of soil moisture distribution and soil evaporation in different dripper discharges were researched.

本文研究了干旱区不同的滴头流量下土壤水分再分布及土壤蒸发的变化规律，结果表明，地表湿润圈的大小直接影响到蒸发量的大小。

Soil CaCO3 eluviation and deposition process is the most important development and evolution process of soil, from parent material to mature soil in the Loess Plateau, arid and semiarid area.

土壤碳酸钙(CaCO_3)的淋溶淀积过程是黄土高原以及干旱和半干旱地区土壤形成发育的主要过程之一，也是地球化学过程的主要内容。

However, tillage enhances soil penetration, mineralization and eluviation, resulting in lose of soil organic matter and NO3-N, subsequently reducing soil carbon accumulation.

但翻耕后，土壤孔隙度和通透性增强，土壤的矿化作用和淋溶作用也增强，导致了有机质的矿化损失和NO3-N淋溶损失，减少了土壤中C的积累量。

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。