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水稳性
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  water stability
    The changes in water stability of >0.25mm aggregates, particle density, bulk density, porosity and water holding capacity of soils under three different land uses were also evaluated relative to soil physical degradation.
    2.试验在土壤有机碳动力学研究基础上,就三种不同草地利用方式下>0.25mm团聚体的水稳性、土壤颗粒密度、容重、孔隙度以及土壤最大持水量的变化作了研究,以评价与其相关的土壤物理性质的退化状况。
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  “水稳性”译为未确定词的双语例句
    Between in withdraws in three carbohydrates components, the most linear relationship were found between diluted-acid extracted carbohydrate concentration and soil aggregates stability, It demonstrated diluted-acid extracted
    而在所提取的三个碳水化合物组分中,稀酸提取碳水化合物与团聚体稳定性最相关,表明在本研究所涉及的土壤中,稀酸提取碳水化合物在水稳性团聚体的形成和稳定性上起主要作用。 这一结果表明,
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  相似匹配句对
    Study on Soil Water Stable Aggregate of Grassland and Forest Flood During Grazing in Hilly and Gully Regions on the Loess Plateau
    黄土高原丘陵沟壑区放牧林草地团聚体稳性的研究
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    Water Intoxication in Calves
    犊牛的中毒
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    Analyses of the quality of water buffaloes' milk
    牛乳的品质分析
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    3 Our research indicated with compared total organic carbon content, carbohydrate carbon concentration were more closed linear relationships to soil water stable aggregates content, stable aggregates ration and mean weight diameter.
    3.与总有机碳相比较,碳化合物碳含量与土壤稳性团聚体的含量、结构稳定率和平均重量直径更相关;
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  water stability
It was found that agricultural use affected the main physical properties of the soils: the bulk density and the water stability of the aggregates.
      
The soil is more compacted on a slope with a gradient of 1-3 degrees, and a decreased water stability of the aggregates is observed on a slope with a gradient of 3-5 degrees.
      
The soil structure and the water stability of the soil aggregates in the upper 30-cm-deep layer have improved.
      
Their density increases, the structure is disturbed, and the water stability of the aggregates becomes poorer.
      
Phosphogypsum applied alone causes a deterioration of the agrophysical properties as it produces an extremely high water stability of aggregates and strong soil compaction.
      
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The effects of rape alfalfa wild ryegrass mixture on major physical, chemical and biological characters of soil were studied in Zhangbei county of Hebei province. It was shown that in a dry year with 167.5 mm rainfall during the growing season, the water storage capacity of the soil under the mixture was higher than that of the soil under the native pastures until the flowering stage of the mixture; and in a year with 355.9 mm rainfall, the water storage capacity of the former kept higher than the latter...

The effects of rape alfalfa wild ryegrass mixture on major physical, chemical and biological characters of soil were studied in Zhangbei county of Hebei province. It was shown that in a dry year with 167.5 mm rainfall during the growing season, the water storage capacity of the soil under the mixture was higher than that of the soil under the native pastures until the flowering stage of the mixture; and in a year with 355.9 mm rainfall, the water storage capacity of the former kept higher than the latter by 5.7~67.6 mm in 1 meter deep topsoil through the growing season. The mixture decreased the salt content of the soil by 0.31 ~ 6.0 g/kg in the cultivated horizon and 0.12 ~ 1.21 g/kg in the 1 meter deep topsoil. Indicated by major indices, the fertility and the structure of the soil were also improved by the mixture. These factors, in turn, promoted the yield of forage production: an increase of 17.8% ~ 319.1% in dry matter and 27.9% ~ 316.1% in crude protein compared to the native pastures. The results indicated that the establishment of artificial mixture pastures in the semi arid region might be an effective way to improve the efficiency of water utilization and increase fodder production.

从土壤物理、化学、生物等方面系统地研究了油菜、豆科禾本科牧草混播人工草地土壤环境效应。干旱年型(生长季降水167.5 m m )混播草地至开花盛期土壤贮水量高于天然草地,之后呈降低趋势;丰水年型(生长季降水355.9 m m )土壤贮水量均高于天然草地,1 m 土体贮水量增加5.7~67.6 m m 。土壤盐分表聚性特征明显,混播草地改善土壤盐分状况显著,耕层和1 m 土体含盐量分别较天然草地降低0.31~6.00g/kg和0.12~1.21 g/kg。混播草地肥力状况改善,速磷和有机质含量增加,而速氮、全氮、全磷含量则呈降低趋势,磷酸酶和H2O2 酶活性增强,脲酶活性下降;> 0.25m m 水稳性团聚体含量提高6.03% 。,结构系数、团聚度提高,改善了土壤结构状况,增大了土壤持水能力。混播草地地上部干物质和粗蛋白产量明显增大,较天然草地分别提高17.8% ~319.1% 和27.9% ~316.1% ,其生物产量和水分利用效率分别较天然草地提高477.1% 和15.2 kg/(m m ·hm 2),建植混播人工草地,显著提高生物产量和水分利用效率。

Trampling is one of three ways for livestock to impact on grazing land is recognized to have longer active time and more permanent effect than intaking and excrement. It is therefore important to study the mechanism of trampling on grazing land in order to discover the mechanism of grassland degeneration and properly manage grazing ecosystems.(1) Trampling on vegetationWhile the trampling of livestock physically damaged aboveground herbage and buried the seeds, it was determined to be beneficial to the germination...

Trampling is one of three ways for livestock to impact on grazing land is recognized to have longer active time and more permanent effect than intaking and excrement. It is therefore important to study the mechanism of trampling on grazing land in order to discover the mechanism of grassland degeneration and properly manage grazing ecosystems.(1) Trampling on vegetationWhile the trampling of livestock physically damaged aboveground herbage and buried the seeds, it was determined to be beneficial to the germination and emergence of seedlings. Further effort and consideration should be given to the critical point of vegetation resistance to trampling and the basic understanding of feedback mechanisms between vegetation and trampling.(2) Effects of trampling on litterOnly two studies showed that trampling aided litter breakdown, by facilitating the infiltration of litter into the soil profile, thereby reducing litter accumulation. The effects of trampling on output and litter decomposition was however still unclear, indicating that further study may be required.(3) Effects of trampling on soilThe majority of studies focused on this phenomenon. There was the most studies on effects of trampling on soil. Trampling increased the compaction and bulk density of topsoil, while decreasing the porosity and water stable aggregates, air permeability and hydraulic conductivity. Within the studies, there was two disputes; one was that some studies showed that trampling resulted in a decrease in the compaction and bulk density of topsoil or no change, while another studies showed that trampling also changed the physical properties in deeper soil horizons. It is our opinion dispute has resulted from the difference in water content of topsoil and or the difference in response mechanism between topsoil and deeper soil respectively, a factor not considered in any studies. Further study should determine the critical value of soil water content while the physical properties of soil began to change because of trampling.(4) Effects of trampling on run-off and soil erosionTrampling caused low infiltration of topsoil and resulted in water logging and O_2 deficiency in the root zone after rainfall. When combined with the reduced coverage of vegetation and litter on soil surface, runoff and soil erosion increased. In our view, wind was also playing an important role in degeneration of grazing land of northern China, but there few studies on the effects of wind on soil erosion after trampling of grazed livestock. Furthermore, all studies had not paid attention to the protection of vegetation and litter from the damage of trampling on soil.(5) Index of trampling intensityCurrent studies have used 4 kinds of indices of trampling intensity. (a) Changes were noted in soil physical properties such as soil compaction and bulk density etc, but were not definite in different soil conditions. (b) Number or body weight of grazed livestock per hectare, but did not distinguish the trampling intensity of different grazing animals and their subsequent effects of grazing behavior on trampling.(c) Pass of human trampling on grassland. We consider the simulated trampling was fundamentally different from that of the grazed livestock. Moreover, the above 3 kinds of indices neglected the time-dependant dynamics of trampling intensity. (d) Body weight of livestock×grazing time Livestock per hectare. This did not take the grazing behavior of livestock and its time distribution pattern into consideration. We suggest that a proper index of trampling intensity should be the function of grazing behavior, persistence of different behaviors, body weight of livestock, area and slope of grazing land, however this will need be developed in future studies.(6) Interrelationship between grazing intensity, the health of grazing land and trampling intensityThe feedback between grazing intensity and trampling intensity was stronger than a between grazing intensity and intaking. There was a positive feedback between trampling intensity and degeneration process in the degraded grassland

放牧家畜的践踏作用是家畜作用于草地的 3个途径之一 ,相对于采食和排泄物的作用具有作用时间长、直接作用的草地组分多和效果持久的特点。家畜践踏损伤牧草、埋实种子、促进萌发 ,减少凋落物的现存量 ,增加土壤的紧实度、容重 ,降低土壤孔隙度、水稳性团聚体、透水性和透气性 ,导致雨后水涝和植物根区缺氧 ,引发水土流失。国内外使用的 4种践踏强度指标分别存在不确定性大、忽视践踏强度的时间依赖性和畜种间差异、没有考虑放牧行为及其时间分配模式等问题 ,分析认为践踏强度应为家畜放牧行为、不同行为的持续时间、家畜体重、放牧地面积和坡度的函数。家畜的践踏作用因草地的健康状况差异而与之存在正或负的反馈机制以及践踏强度阈值 ,可能在草地退化和健康维护中起主导作用。今后需建立严格的研究方法和科学的践踏强度指标 ,重视草地植被对践踏的耐受阈限、践踏对牧草更新的调控机理及其对凋落物产生和分解的影响 ,以及土壤水分与践踏作用的关系 ,确定放牧系统的践踏强度阈值。

Based on hilly -gully regions on the Loess Plateau -Pianguan, Shaanxi province, to analyze surface (0-10cm) soil water stable aggregate content of grazing grassland and forest floor of different types of vegetation ,different types of livestock and different grazing intensity. The results showed that compared with woodland, grazing grassplot had better soil structure and structure stability) and soil aggregate content is least at heavy grazing intensity and also the soil structure stability is worst. Compared...

Based on hilly -gully regions on the Loess Plateau -Pianguan, Shaanxi province, to analyze surface (0-10cm) soil water stable aggregate content of grazing grassland and forest floor of different types of vegetation ,different types of livestock and different grazing intensity. The results showed that compared with woodland, grazing grassplot had better soil structure and structure stability) and soil aggregate content is least at heavy grazing intensity and also the soil structure stability is worst. Compared with goat selected as grazing livestock, sheep had less effect on destroying soil structure and had large quantity of soil aggregate; also the surface soil structure stability of the grazing land under sheep is better than under goat.

以黄土高原丘陵沟壑区——山西偏关县为例,对不同放牧植被类型、不同放牧强度、不同放牧畜种条件下表层土(0-10cm)的团聚体水稳性进行分析研究。结果表明,放牧草地较之放牧林地的土壤结构及结构稳定性要好;重度放牧下土壤团聚体含量最小,其结构稳定性亦最差;从畜牧羊种选择来看,绵羊相对于山羊来说对土壤结构破坏较小,土壤中团聚体含量较多、团聚体水稳性也较好。

 
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