查询词典 infertile soil

The physical characteristics of water in the soil included soil bulk density, MWHC, capillary water holding capacity and least water holding capacity were also measured by soaking and discharging experiments with samples of soil from different soil depths in all studied communities.

通过对苔藓、枯落物和土壤的野外调查与室内实验，分析了川西高山和亚高山3种主要灌丛在不同海拔梯度的地被物及土壤持水性能，其有利于加深对长江上游高山和亚高山区灌丛水文效应的认识。

The results showed that there were significant differences among fungal species or ecotypes in all above index,which varied with soil types.First,six fungi could colonize maize root on three soils,and the fungal colonization rate was higher on soil collected in the region that had been screened for cinnamon soil and brown soil.

结果表明，6种菌株在上述指标上存在显著的种间或生态型差异，土壤与菌株间存在显著的交互作用。6种菌株在3种土壤上都能与玉米形成菌根，在褐土和棕壤上大多数菌株在分离地所在地区土壤类型上的菌根侵染率较高，说明其对该土壤条件的适应性较强；在红壤强酸性土壤条件抑制了菌根真菌的侵染。

The effects of earthworm on soil enzyme activities,microbiomass carbon,microbiomass nitrogen and the growth of apple tree were studied by pot experiment,using the orchard cinnamon soil,brown soil and fluvo-aquic soil and two-year old'Red Fuji' appleMalus domestica Borkh.

以果园褐土、潮土和棕壤以及2年生红富士苹果(Malus domestica Borkh。)幼树为试材，在盆栽条件下，通过向盆土埋放蚯蚓，研究蚯蚓对土壤酶、土壤微生物量碳和氮以及苹果根系和新梢生长的影响。

In this thesis, with regard to the stability and deformation of the strut frame made of composed soil nails in soft clay foundation pit, the studies listed below are carried out, considering current research and design status of the soil nailed retaining structure. 1、This paper begins with the concept of the strut frame made of composed soil nails, analyzing the composition and the technique of the construction of the strut frame made of composed soil nails.

本文鉴于软粘土地区深基坑工程土钉支护结构的研究及设计现状，在前人研究的基础上，就复合土钉支护软粘土基坑的稳定性和变形展开相应的专题研究，主要完成了以下几个方面的工作： 1、从复合土钉支护结构的概念入手，对其结构组成、构造形式以及施工方法进行了综合分析。

In each of the three effect factors, the main items are: crown cover—crown density and thickness of the crown; litter layer——dry weight of the litter on each unit area, thickness of the litter and the biggest amount of holding water in the litter; soil——soil porosity, soil capillary space and soil moisture content.

三层次中的主要影响因子有：林冠层——郁闭度和林冠厚度；枯落物层——单位面积枯落物干重、枯落物厚度及枯落物最大持水量；土壤层——土壤总孔隙度、毛管孔隙度及土壤含水量。

To control the ground-water table on irrigated lands is vitally important in arid and semi-arid regions. In order to determine the standard of water table control, considerable attentions were paid to the "critical depth"(or "safe depth") of ground-water table. The salts accumulate in the top soil if the water table is not deeper than this depth. The conditions that the salts accumulate in any layer of the soil owing to the movement of soil moisture are:(1) the supplement of soil moisture from neighboring...

本文分析了地下水补給情况下土壤水分的形态和不同形态的水分在土壤中运行和蒸发的一些特点，论証了毛管水联系破裂含水率等土壤水分形态指标与土壤水分运动和土壤积盐状况的关系，探討了次生盐碱化发生的地下水临界条件，提出了地下水临界深度的确定方法，并且对現有的临界深度的确定方法进行了討论与比較。

The paper focuses on the load distribution and load transfer among soil, pile-core and pile-socket, the interactive behavior of cement-soil ring and reinforced concrete core and some corresponding factors influencing the displacement of the pile which include the various core length, the section radius, the elastic modulus of soil and cement–soil etc.

着重分析了砼芯水泥土搅拌桩的竖向荷载在桩身内外芯和桩土各部分间的分配，砼内芯桩与水泥土外芯桩在荷载传递过程中的相互作用和共同工作特性，以及影响单桩沉降的因素包括砼内芯的直径和长度、水泥土和桩周土体的弹性模量等。

The study showed that there were consistent change of total N and available N contents with alfalfas growing for different lengths of time in 0-1000 cm soil. Soil total N and available N contents decreased with soil depth, and tended to remain relatively constant in soils deeper than 350 cm below soil surface.

结果表明，在0-1000 cm土层，不同生长年限苜蓿草地土壤全氮与碱解氮含量均呈现规律性的变化，即随土层深度的增加，全氮及碱解氮含量下降，350 cm土层以下，变化趋势平缓。

Effect of acid soil on dry matter accumulation and Al and nutrient contents of barleys differing in acid soil toleranceThe experiment was conducted by using 10 barley genotypes with different acid soil tolerance at seedling stages, each 5 genotypes for acid tolerance and sensitivity, to determine the difference in biomass accumulation, Al and nutrient content in the roots and shoots among genotypes under the condition of acid soil stress.

低pH和两种铝处理下植株各器官ca、Mg含量，茎杆和叶片P、K含量，叶片Fe、MO、Zn含量以及茎杆Zn、B含量和根系及叶片Mn含量均降低，铝福复合处理时降幅更大。100林MAI处理，大麦幼苗整个试验期间根系分泌的苹果酸、柠檬酸和唬拍酸含量与对照相比均增加，且耐铝基因型增幅大于铝敏感基因型，表明铝诱导这些有机酸分泌量增加可能与品种耐铝性有关。

The study indicates that the content of soil carbon is on the low side because human behavior has a negative effect on sloping cropland. However, the content of every group soil carbon increased drastically by planting Robinia . With the increasing of the time of conservation, the relationship is very remarkable. After 50 years of restoration, the content of TOC, LOC, NLOC and AI in the study plot increased by 271%,174%, 467%, and 271%, respectively, compared with sloping cropland. The increasing speed of NLOC was faster than LOC. It is assumed that the increased carbon by restoration is stored in an inactive form to produce active matter which is necessary for biont. And the soil carbon must keep active to fulfill the balance of carbon dynamic transformation. At initial stages, soil carbon management index increased remarkably.

营造刺槐林可以显著增加土壤碳库各组分含量，并随恢复年限呈显著线性关系，50a时TOC、LOC、NLOC和碳库指数分别较坡耕地增加271%、174%、467%和271%，其中NLOC增加速率略高于LOC，表明植被恢复增加的土壤碳素绝大多数以非活性形态贮存起来，而为了满足生物生长所必须的活性物质来源，土壤碳库必须维持一定的活度状态来满足碳素的动态转化平衡，碳库管理指数在营造刺槐林初期显著降低，随后先增加后降低，与刺槐林生长特性密切相关；但与天然林相比差距仍然较大，恢复50a时TOC、LOC和NLOC仅为侧柏林的49%、34%和61%。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48