查询词典 properties of soil

Soil microbial biomass and activities of invertase and urease all tended to decrease after pot-culture experiment, while the correlations between these biochemical properties and field ages were similar to those before this experiment, suggesting that rice cultivation without fertilization consumed part of soil microbial biomass, decreased soil enzyme activities correlated with C and N transformation, and affected soil nutrients status disadvantageously.

温室盆栽试验之后，水稻土的微生物生物量及酶活性与利用年限之间的关系规律和种植水稻之前基本一致，且整体上又趋于下降，即无施肥条件下种植水稻转化利用了土壤部分微生物生物量，并减弱了与碳氮转化相关酶的活性，对保持水稻土的营养水平造成不利影响。

In China,more and more constructions in cold regions appear,Strength and deformationof frozen soil,characteristics of frost heave and thaw collapse have become the major task forcold regional construction.But researches on mechanism of frost heaving are still not maturedowing to complexity of frozen soil,and the current study,thinking little of the freezing andthawing process,mostly focuses on the different physical and mechanical properties betweenfrozen soil and thawed soil.

随着我国寒区工程建设项目的增多，冻土的强度与变形问题以及冻胀融沉特性研究成为面临的最重要任务，但是由于冻土的复杂性，现有的冻胀机理相关研究尚不成熟，大多还是研究已冻土和融土物理力学性质差别，缺乏对正冻正融过程的相关研究。

An optimization model was established for identifying the soil hydraulic properties. The optimization objective was the minimum mean square deviation of simulation between measured and observed values of soil water content, and the constraint conditions were the upper and lower limit values of empirical soil hydraulic conductivity and water diffusion coefficients.

该文以反映土壤含水率实测值和计算值吻合程度的均方差最小为优化目标，以土壤导水率和扩散率经验参数上下限为约束条件，建立了土壤水分运动参数识别的优化计算模型。

The results obtained by the correlation, path and principal component analysis showed that soil urease and alkaline phosphatase activities could be as a comprehensive index of soil fertility, and their enzyme activities are affected by soil chemical properties and other enzymes.

结果表明，土壤脲酶和堿性磷酸酶活性可以作为土壤肥力的指标，且酶活性大小受到土壤化学性质和其它酶活性影响。

The results showed that: the indictors of soil enzymes and soil physiochemical properties were significantly different, and decreased with the deepening of the soil in all kinds of vegetation.

结果表明：在各种林分类型之间所测土壤理化性质和土壤酶指标有显著性差异，并且随着土层的加深，均表现出不断减小的趋势。

Find out the key different properties of layer ⑥, layer ⑦1 and layer ⑦2 soil broadways, find out the key different properties of each layer of soil lengthways.(4) To find out several measures that can improve the safety performance of

从横向比较了⑥、⑦1、⑦2这三层土冻结性能的差异性，从纵向分析了各层土的参数在二次冻融循环条件下的变化规律；(4)从试验结果得出可以对有利于提高人工冻结法安全性的措施，提出冻土温度在-12℃～14℃之间时安全性和经济性都比较合理。

Samples from Changchun-Siping highway, Changchun-Songyuan highway and North Changchun-Jilin highway were studied.Studied from microstructure of frozen soil, combining physicochemical tests and mechanical tests, the influence of properties of seasonally frozen soil in Changchun area on moisture movement is evaluated,which provides the experimental evidence for study of moisture movement of seasonally frozen soil and the road frost heaving and mudding in Changchun area.

以长春-四平线、长春-松原线以及长春-吉林北线3段公路土样为研究对象，从微观结构出发，结合物理化学试验和力学试验，评价了长春地区季冻土的性质对水分迁移的影响，为长春地区季冻土的水分迁移研究、道路冻胀翻浆的防治等提供试验依据。

The objectives were to analyze the effects of wind erosion under plough tillage and no-tillage, evaluate changes in soil physical, chemical and biological properties due to different tillage practices, and to discuss the effects of soil properties on wind erosion.

以北方农牧交错带为研究对象，分析了免耕对农田土壤风蚀的影响，评价了不同耕作方式下与土壤风蚀相关的土壤物理、化学和生物学特性的差异。

The Correlation between enzyme activities and physical properties of spruce forests soil The acid phosphatase was conducive to the increase of natural capacity, capillary capacity, saturated water capacity, non-capillary capacity, total porosity, non-capillary porosity, and the decrease of bulk density; the catalase and proteinase were conducive to the increase of capillary porosity and water porosity, respectively, these results suggested that catalyze function of soil enzyme directly acted the formation of soil physical structures.

土壤酶活性与土壤物理性质的相关性酸性磷酸酶活性的增强，有助于土壤自然含水量、毛管水含量、饱和水含量、非毛管水含量、总孔隙、非毛管孔隙的增加及容重的减小；过氧化氢酶和蛋白酶活性的增强分别有助于毛管孔隙和水占孔隙的增加。

The upland yellow-red soil as case, the automatic classification techniques for soil type and soil organic matter map at county scale (1:50,000) were developed based on knowledge classification rules and expert classified simulator; The relationship between physico-chemical properties of coastal saline soils and their hyperspectral reflectance were studied; The multi-temporal RS data were used to detect the land use in coastal soil region; The spatial variability and sampling strategy for coastal saline soils were researched.

以滨海盐碱土为对象，在国内系统的开展了盐碱土理化特性和地面土壤高光谱之间的关系研究，并利用不同时相遥感资料进行盐碱土地区农业土地利用制图，研究了盐碱土不同剖面土壤空间变异特性和高效采样策略。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。