土壤层次

真菌DGGE图谱条带数目多且亮度很高，不同采样点与不同土壤层次间差异较大。

For the Fungal DGGE profile , there were many bands with high brightness , which showed great variation among different sampling points and different soil layers .

在人为控制灌水的条件下，采用将15N标记到不同土壤层次的土柱试验，研究小麦不同生育期对土壤不同深度硝态氮的利用。

Recoveries of labeled nitrate-N in different soil layers by wheat at different growth stages were investigated with soil column experiment under the controlled irrigation condition .

2～4m土壤层次因无水分回补出现持续下降趋势；

It trended that soil from 2 to 4 m depth was becoming dry because no water supplement .

从垂直变化看，均随土层深度增加而显著降低（P0.05），均可将其土壤层次划分为表层急变层、水分利用层和水分稳定调节层。

Viewed from the vertical change , the soil water content decreased with the increasing of soil depth ( P0.05 ) . It could be divided into the surface soil layer , water use layer and water stability and regulation layer .

硝态氮含量随着土壤层次的加深逐渐递减，各层次之间具有显著差异（P<0.01）。

Nitrate-N significantly decreased with increasing soil depth ( p < 0.01 ) .

随着土壤层次的加深，种子库密度逐渐下降。

Soil seed density decreased with soil depth .

基于探地雷达的复垦土壤层次无损探测研究

Nondestructive Detection of Soil Layer Based on GPR

不同土壤层次供应水分和养分对玉米幼苗生长和吸收养分的影响

Effect of Water and Nutrients Supplying in Different Soil Layers on Growth and Nutrition Absorption of Corn Seedlings

不同土壤层次氧化甲烷的潜力也有差异，表层土比下层土高。

Different soil layers had various potential of methane oxidation . The surface layers were higher than the low layers .

利用地理信息系统软件，绘制灌区不同土壤层次的盐分分布图，定量评价了灌区内土壤盐渍化程度的分布状况。

The distribution maps of soil salt content were obtained using GIS , which quantitatively assess the distribution condition of saline soil in irrigation area .

林地的不同土壤层次间，坡顶的土壤水分年变化基本一致，而坡腰的则较复杂。

For various soil layers of the forestry , the annual change curve of soil moisture was coincident for top slope location but different for middle slope location .

本文研究结果表明，水稻土中的脲酶产生菌的数量，无论是不同季节，不同类型的水稻土，还是土壤层次的分布上与其相应的土壤脲酶活性高低相一致。

The investigation showed that the numbers of urease-producing microorganisms were identical with the urease activities in responding paddy soils whatever different seasons , soil type and the distribution of soil profile .

初步形成了以下结论：1.试验区各土壤层次含水量的平均值自上而下逐渐增加，且属于强变异。

Conclusions were as follow : 1 . The average value of soil water content of 0 ~ 50cm soil layer in the test area all gradually increases from top to bottom , and their variation coefficients all belong to strong variation .

本试验模拟滴灌方法，在不同土壤层次进行灌水和施用氮磷养分的盆栽玉米试验，旨在探讨在不同土壤层次供应水分和养分对夏玉米幼苗生长、根系空间构型及玉米对养分吸收的影响。

Drip irrigation method was simulated in this experiment in different soil layers Pot experiments with irrigation and nitrogen and phosphorus application were conducted for investigating the influence of water and nutrients supplying in different soil layers on the seedling growth , spatial root model as well as nutrient absorption .

本研究发现，污泥会不同程度地增加土壤各层次的Cd、Cr总量。

It was found , application of sludge resulted in increases in total amounts of cadmium , chromium in different layer of soil in some degrees .

土壤剖面层次中Cd含量呈从上到下逐渐降低趋势，Cd大部分富集在土壤表层，即耕作层，给农业生产带来了极大的风险。

The concentration of Cd in the soil sections reduced from the top down , Cd was enriched in the surface , which increased the risk of agricultural produce .

利用~（15）N层标记的土柱试验法，研究了蔬菜和大田种植体系中菠菜、小麦两种作物及小麦的两个品种对土壤不同层次标记硝态氮利用的差异。

The difference on the utilization of labeled nitrate-N in different soil layers between two kind of crops , spinach and wheat , as well as two varieties of wheat was studied by means of soil column experiment .

土壤不同层次水稳性团聚体中POC的来源不同，在0~5cm表层可能主要来源于作物根茬生物量，而在5~15cm土层则可能跟施入的外源有机物有关。

Regression coefficients showed a possible source of POC in water-stable aggregates from increased crop biomass in topsoil ( 0-5cm ) and organic matter applied in sub-surface layer ( 5-15cm ) .

两种作物对土壤不同层次标记硝态氮利用的差异

Recovery of Labeled Nitrate-N in Different Soil Layers by Two Kind of Crops

冲积平原上区域土壤质地层次的某些分布特征

Some distribution features of textural layers of regional soils in a fluviogenic plain

土壤各层次水分特征曲线、比水容量曲线差别不大。

It is not different from moisture capacity curve .

草甸棕壤区耕作土壤的层次发育及其肥力特征

The horizon development and its characteristics of cultivated soils in meadow brown earth region

在本试验水氮管理条件下，菠菜对土壤不同层次标记硝态氮的利用率显著大于小麦；

Under conventional water and nitrogen management condition , the recovery of labeled NO-3-N in different soil layers by spinach was significantly higher than that by wheat ;

增加了土壤关键层次（0~20cm）和关键时期（4~6月）的水分含量，延缓和缩短了夏季高温干旱与秋季持续干旱时间；

It increased the moisture content in key soil layer ( 0 ~ 20 cm ) during key time ( April-June ), and also , postponed and shortened the period of high temperature in summer and the continual drought in autumn .

通过对黄土高原典型残塬董志塬麦田不同时期土壤各层次水分含量的分析，揭示了陇东黄土高原塬区土壤干旱特征。

In this paper , characteristics of soil aridity in the upland of the Longdong Loess Plateau was determined through the analyses of soil water content of different periods in different layers of wheat field on the typical " Dongzhi Upland " .

在高湿度环境下用活性炭盒测量氡浓度的研究黄土性土壤剖面不同层次N2O浓度的原位监测

STUDY ON RADON CONCENTRATION MONITORING USING ACTIVATED CHARCOAL CANISTERS IN HIGH HUMIDITY ENVIRONMENTS In-situ measurement of N_2O concentration from profile of loess soil

通过标准差和变异系数将土壤水分垂直层次划分为速变层、活跃层和次活跃层，且土壤水分层次剖面与降雨年型有关。

The soil moisture profile is divided into the rapid change layer , the active layer and the second active layer by the two indexes of standard deviation and variation coefficient , and the relation of soil moisture profile with the precipitation in the same period is analysed .

土壤侵蚀的ETA层次结构与空间尺度效应

Multi-level structure of ETA and space scale effect of soil erosion

土壤紧实度及层次对小麦生长的影响

The wheat growth affected by the soil compaction and layers

用化学选择溶提法，测定了幕阜山不同海拔高度土壤及剖面不同层次的粘粒中铁铝氧化物的含量。

The Contents of iron and aluminum oxides in MUfu mountain soil clays were determined by selective dissolution technique .