查询词典 soil horizon

Then, a continuous soil horizon thickness distribution map was drawn with the aid of ARC/info software based on samples collected at the area with high value of fuzzy membership and population of the similarity model using the linear and additive weighting function.

通过对研究区地形因子的模糊聚类，提取了地形因子组合与特定土壤属性的定量隶属度关系，然后对隶属度高值区土壤进行目的性采样为隶属度函数赋值，制作研究区土层厚度连续分布图。

It was obvious that soil salt accumulated in deep soil of farmland and soil salt accumulated in surface horizon of uncropped soil.

在绿洲内部，农田土壤因灌溉淋洗向深层积盐，荒地因土壤蒸发强烈向土壤表层积盐。

The eluvial soils on slopes where surface flow occurs are mainly clayey soils with some blocks or debris. They have good grading distribution and a thin soil horizon.

发生坡面流的斜坡残坡积土主要为粘性土，含少量块石或碎石，级配较好，且土层厚度小。

DGGE was used to study 16S rRNA (V3 region) of soil microbial community, the result shows that the structure of soil microbial community changed a lot, when the degeneration of grassland is progressing, especially the structure of soil microbial community in surface lamina; The structure of soil microbial community in podzolic horizon of hypo-surface lamina of the grassland degenerated heavily, is similar to soil microbial community in illuvial horizon of the typical grassland and the grassland degenerated lightly.

重度退化草原亚表层的灰化层细菌群落结构类似于典型草原和轻度退化草原的淀积层的细菌群落结构。

Carbon storages of the upper horizon in lessive dark brown forest soil, brown coniferous forest soil and mountain tundra soil were 10959 gC m-2 (0-20 cm), 4199 gC irf2 (0-10 cm) and 6171 gC m~2 (0-32 cm) respectively, occupy 60%,50% and 77% of total carbon storage. This showed that the upper horizon was accumulating soil organic carbon.

显然，低海拔地带土壤发育程度比高海拔带土壤发育程度要好，这是由于高海拔带土壤受火山喷发、气候、温度等自然因素的影响较大，从而致使土壤有机质的发育过程缓慢。

Conventionally the layers have been divided into A, B and C horizons. The A horizon is the upper layer, containing humus and is leached and,or eluviated of many minerals. The B horizon forms a zone of deposition and is enriched with clay minerals and iron,aluminium oxides from the A layer. The C layer is the parent material for the present soil and may be partially weathered rock, transported glacial or alluvial material or an earlier soil.

传统上可将土壤分成A、B、C三层。A层是位於最上面的一层，含有腐殖质，许多矿物质在该层中沥滤和淋溶。B层是个沉积区，富集了大量的来自A层的粘土矿物质和铁，铝氧化物。C层是现在土壤的母质层，也可能是风化的岩石、来自冰河或冲积层的物质、或早期土壤遗留下来的。

A hardened soil horizon, usually in the middle or lower part of a soil profile, A hardpen is typical of PODSOLS, where iron compounds leached from the upper layers accumulate in the B horizon, staining it red-brown and forming an impermeable layer that can prevent drainage, resulting the in waterlogging of higher horizons.

硬质地层是一种典型的灰壤，其中铁的化合物从上层土壤中渗出，在 B 层中聚集，使得土壤呈现棕红色，构成了极难透过水的土层，这种地层的存在使上层的土层更易发生水涝。

Firstly,soil erosion modulus was estimated using USLE and maps of soil density and soil horizon thickness were derived from detailed soil survey data.

土壤侵蚀是造成地表水土流失的直接原因，也是我国国土整治的主要目标和任务[2]。

Oxalic acid loading substantially stimulated soil P release from A1 horizon, showing a linear relationship; but its effect on B horizon soil was relatively negligible, especially at low oxalic acid concentrations mmol L^(-1. Oxalate solutions 0.5~20.0 mmol L^(-1 oxalic acid adjusted to pH 5.16 with 10.0 mmol L^(-1) NaOH had a much higher (1.51~2.98 times) soil-P-release effect than oxalic acid solution the same in oxalate concentration. Therefore, the mechanism of oxalic acid/oxalate triggering release of soil phosphorus is assumed to be dominated by ligand-exchange or complexing reactions of oxalate anionC2O(superscript 2- subscript 4 but not simply acid-dissolving effect. The effect of oxalate anion on soil phosphorus release was found to be somewhat cumulative, i.e. the amount of P released was primarily controlled by the cumulative oxalate loading rate, relatively independent of the manner of oxalate addition (one-time or sequential).

结果表明，草酸能显著促进暗棕壤A层磷的释放，土壤磷溶出量随草酸溶液浓度升高而线性增加；但对B层土壤磷的释放效应相对较弱，草酸浓度低於5mmolL^(-1)时B层磷的释放不明显。pH5.16草酸钠溶液比相同浓度的草酸溶液具有更高的解磷效率，在设置二者浓度为0.5~20.0mmolL^(-1)时，前者的解磷量是后者的1.51~2.98倍，推断草酸盐溶液或凋落物淋洗液中草酸类物质促进暗棕壤磷释放的主要机理在於草酸阴离子C2O(上标 2-下标 4配位反应。

The results are:(1) The higher of altitude,the less of soil acidity in soil C horizon at Dinghushan;(2) There are more NH4-N,total K,available K, exchangeable K,exchangeable Na,exchangeable Mg and the content of exchangeable cations in lateritic red soil at low altitude than those in yellow soil at high altitude;(3) With increasing altitude,the contents of sio2 and Mn decrease,and the concentrations of this two minerals in lateritic red soil are higher than those in yellow soil.

结果为：（1）鼎湖山土壤剖面C层随着海拔梯度的上升，土壤酸度降低。（2）鼎湖山位于海拔低的赤红壤的NH4-N，全钾，速效钾，交换性Na，交换性钾，交换性Mg和阳离子含量比位于海拔高的黄壤的对应养分含量要高。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失