查询词典 infertile soil

For 480 days of decomposition, the decomposition rate was highest in soil with medium fertility and lowest in soil with low fertility among three type of fertility. The decomposition of water soluble factions and lignin were promoted in medium fertility soil. However, alcohol-benzene soluble fraction, and semi-cellulose and cellulose fraction were decayed acceleratedly in soil with high fertility. Furthermore, more humic substance was formed and energy states of decayed corn stalk was highest in soil with high fertility.

腐解480 d，3种肥力间比较发现，玉米秸秆在中等肥力田块上矿化率最高，低肥力田块上的最低；中等肥力土壤能够促进玉米秸秆中的水溶性有机组分和木质素的分解，而高肥力土壤能够促进苯–醇溶性组分和半纤维素、纤维素分解，并有利于腐殖物质的形成，而且腐解物的能态最高。

Dark brown forest soil in Taoshan are 5 subgroups, 9 soil geneus and 16 soil species in total; there are 4 soil types and 9 subgroups of azonal soil.

该地区为暗棕壤，共有五个亚类，九个土属，十六个土种；非地带性土壤有4个土类、九个亚类。

In order to determine organic storage and its space distribution characteristics in paddy field of region, on the basis of second soil survey database, the space databases in unit of soil local type were set up by adoption Arcview software, integrated with GIS software, basined on soil type methods and region scale, the distribution of soil organic carbon storages in purple paddy soil of Chongqing were investigated. The results showed that the storage of SOC in Banan district of Chongqing was 6.48×10^6 t and average SOC density in Banan district with 8.31 kg/m^2 was higher than that of China.

为了明确区域稻田土壤碳库蓄积量及其空间分布特征，以全国第二次土壤普查数据资料为基础，运用地理信息系统软件Arcview建立研究区以土种为单位的空间数据库，结合GIS空间分析功能，基于土壤类型法估算重庆市巴南区稻田土壤有机碳储量及其空间分布特征，结果表明：研究区稻田土壤有机碳总储量约为6.48×10^6t，平均土壤有机碳密度为8.31kg/平方公尺，略高于全国平均水平。

The result indicated that, although microorganism from paddy soil could directly reduce Cr, the reduecing rate and efficiency were limited; the higher Cr concentration was, the less reducing ability the microbial showed; the microbe from different paddy soils had different effects on Cr reducing abilities; The reducing ability of the microbe from Sichuan paddy soil was higher than that from Jiangxi paddy soil. Cr added could be rapidly reduced in paddy soil under anaerobic incubation, moreover, the process of dissimilatory iron reduction of soil could obviously promote the Cr reduction. The existent of Cr could delay the appearance of Fe; the higher Cr concentration was, the later Fe appeared. The delayed time of Fe appearance was in accordance with the ending time of Cr reduction.

结果表明，由水稻土中提取的微生物虽然能够直接还原Cr，但其还原速率和还原程度有限，且Cr浓度越高，微生物的还原能力越差；不同来源的上壤微生物对Cr的还原能力有所差异，其中四川水稻土中微生物对Cr的还原能力均大于江西水稻土；在厌氧培养的水稻土中，添加的Cr可以较迅速地还原，其中土壤氧化铁的微生物还原过程对Cr还原具有明显的促进作用；Cr的存在导致Fe生成的时间出现滞后，目Cr浓度越大生成Fe的滞后时间越长；Fe产生滞后的时间与Cr还原结束的时间具有一致性。

With the soil planted the konjac as the investigation and study object and planted corn as CK, the soil organic carbon, soil active organic matter, soil entire nitrogen, edaphon quantity and edaphon community structure was determined. The change of soil carbon nitrogen, edaphon carbon nitrogen and edaphon bacterium and fungus was analyzed.

方法］以种植魔芋地的土壤作为调查研究对象，用种植玉米的土壤作为对照，测定土壤有机碳、土壤活性有机质、土壤全氮、土壤微生物量和土壤微生物群落结构，分析土壤碳氮、土壤微生物碳氮和土壤微生物细菌和真菌的变化。

Then, soil structure was destroyed and formed erodible particles with size 0.154 to 0.18 mm in the soil surface. Under the impact of strong winds and vehicle wheels, soil erosion by wind and vehicle wheels in soil surface was severe, and some fine particles (≤0.063mm) disappeared gradually, so soil structure would evolve to be coarse.

在车轮的碾压作用下草原土壤表面形成易风蚀粒子（0.154~0.18 mm），受强风和车轮的携带作用后表土风蚀严重，很多细颗粒（粒径≤0.063 mm）在车轮的携带和强风的作用下会逐渐消失，土壤表面进一步向粗粒化发展。

Daxing as the case study has been studied in this dissertation, with the help of geostatistics and GIS, on the basis of data of the second general soil quality investigation in 1982 and the corresponding data of indoors soil analyzed, the spatio-temporal law of organic total-N, hydrolyzable nitrogen, available-P and available-K below the surface of soil (0-20cm) within 20 years in Daxing has been studied, as the same time, the change of soil quality has been evaluation applying to the method of soil quality compressive index, the main results are as follows

本文以北京市大兴区为研究样区，以相同样点的1982年第二次土壤普查土壤肥力数据和2000年的新采土样分析数据为基础，运用GIS与地统计学结合的方法，研究了20年来北京市大兴区300多点位的表层土壤的(0-20cm)有机质、全氮、碱解氮、速效磷、速效钾等肥力要素的时空变化规律，应用土壤质量综合指数法定量评价了表层土壤质量的变化，研究主要结论如下

By overlapping the charting of land desertification and the types of soil, the writer concludes that desertification is common to semi- hydromorphic soil and desert soil. And the reversion of alkaline soil shows the achievements of improvement of quality of alkaline soil.

将土地荒漠化图与土壤类型进行叠加，发现荒漠化在半水成土和漠土上发育比较普遍，而盐碱土类型上出现荒漠化逆转，说明多年来新疆对于盐碱地的改良和利用取得了有效的改善； 5。

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。

The Wien effects of three variable charge soils (red soil, lateritic red soil and latosol) saturated with various chlorides in electric field were different. The relative electrical conductivities of red soil saturated with various chlorides increased apparently with the increase in field strength, whereas that of latosol were almost equal to 1 in the test field strength (15 kV cm-1 to 250 kV cm-1), the increase of △EC in lateritic red soil were between that of red soil and latosol.

各氯化物饱和红壤悬液的相对电导率随着场强的增加而明显增大，且不同的氯化物饱和悬液的△EC之间差异明显；砖红壤悬液的△EC随着场强的增加没有出现变化，在所测场强下（15 kV cm -1到250 kV cm -1）各悬液的△EC都几乎为1；而赤红壤悬液中的现象处于前两者之间。

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