半干旱的

Soil erosion by wind is a major cause of farmland degradation in arid and semiarid area of north China.

土壤风蚀是中国北方干旱半干旱地区农田土地退化的重要原因。

Wind erosion is one of nature disaster around globe. This phenomenon is widely distributed in arid and semiarid area.

风蚀是全球性的自然灾害之一，此现象广泛分布于干旱半干旱地区。

Land desertification is one of the most main types of land degradation in the arid and semiarid region,northern China.

土地沙漠化是我国北方干旱半干旱地区土地退化最严重的类型之一。

A system of producing crops in arid and semiarid regions without the use of irrigation.

指一种在干旱或半干旱土地上不使用灌溉方法生产作物的耕作制度。

The location variation of arid and semiarid boundaries is closely related to regional warming and precipitation reduction.

干旱和半干旱分界线的位置变化与区域升温和降水减少密切相关。

The social and economic sustainable development in the arid and semiarid area in China has been restricted by sandy desertification heavily.

沙漠化是制约我国干旱、半干旱地区社会经济可持续发展的重要因素。

Of arid and semiarid open country.

产于干旱和半干旱地区的空旷乡间。

This phenomenon is widely distributed in arid and semiarid area.

中国西北广大地区地处干旱半干旱地区，风蚀严重地影响着这些地区的农业生产。

Crust or layer of hard ''.'subsoil'.

干旱或半干旱地区的''。

Because of the regional difference of soil and climatic conditions, the division of 4 stages of soil moisture circulation is not all the same between different areas; the soil moisture dynamics between different dry farming areas in the Yellow River Basin is contrasted in this report. The results indicate that soil moisture increases gradually from dry semi-arid area to semi-arid area, dry semi-humid area and semi-humid area, and the high value district generally appears during soil moisture resuming period in rainy season or soil melting period. While the low value district appears at the stage of fast evaporation in spring or slow evaporation in autumn; in views of vertical changes of soil moisture, it is showed that the variation range of upper lays is larger than that of lower among the different dry farming areas in the Yellow River Basin.

由于各区域之间土壤、气候条件的差异，各地土壤水分循环4个阶段的划分也不尽相同；黄河流域不同旱作类型区土壤水分动态变化比较结果表明：就季节变化而言(来源：A70b0B0bC论文网www.abclunwen.com)，由半干旱偏旱区→半干旱区→半湿润偏旱区→半湿润区土壤水分含量呈逐渐增加的变化趋势，而且高值区一般出现在雨季恢复阶段或春季土壤融冻返浆时期；而低值区均出现在春季大量蒸发阶段或秋季缓慢蒸发阶段；就垂直变化而言，黄河流域不同旱作类型区土壤水分垂直变化的趋势均表现为上层变化幅度较下层大。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。