荒漠化

The results showed that there were significant differences among parameters of texture feature of the different land utilization. In the desertification, the mean and variance were comparatively high. The gray level was asymmetry, the contrasts between neighboring pixels were significant; while in water and irrigable land, the mean, variance was a little bit low, the grey level was symmetry; the mean, variance and gray level in the forest and dry land was between the above (desertification and water and irrigable land).

不同土地利用类型之间纹理特征参数差异明显，荒漠化土地的均值、方差值较高，灰度分布不均匀，相邻像元反差明显，内部变化剧烈；水体和灌溉耕地的均值、方差值很低，灰度值均匀，内部变化小；林地和旱耕地信息介于上述两类土地之间。

Most species' populations were decline in last fifty years, especially since the last 1980's, the populations such as Alpine Musk Deer, Przewalski's Gazelle and Red Deer etc. declined dramatically;(5) Desertification and grassland degredation are obviously affected by climate change on macrographic scale, anthropogenic activities is an important driving role for desertification, herbing, land-development and urbanization have majority impact to biodiversity spatial pattern and its loss.

祁连山区动物资源组成成分复杂，总体上缺乏自身特有的种类，哺乳动物区系特点不很突出，既包含了东部黄土高原和东南湿润地区的兽类成分，又不乏青藏高原特有种类，同时还与新疆的动物区系有一定的联系，近50年来尤其自上个世纪80年代以来，多数种类的种群数量呈下降趋势，其中以马麝、普氏原羚、马鹿等物种的数量下降的最为显著；（5）土地沙漠化和草地退化在宏观尺度上受气候因素影响较大，人类活动对荒漠化的加速发展起着重要的驱动作用，尤其是放牧、土地开发和城镇化建设对生物多样性资源减少以及空间分布格局影响较大。

Based of the meteorologic data of the 45 years from 1960 to 2004,from the perspective of temporal series analysis, the dissertation analyzes the features of climate variation, and its influence over the desertification of Xinjiang as well as the natural driving factors of it.

以1960~2004年的气象资料为基础，从时间序列分析的角度，利用空间插值等技术分析近几十年新疆的气候变化特征及这种变化对于新疆土地荒漠化的影响。

Desertification of the oases and its assessment index system〔J〕.

绿洲荒漠化及其评价指标体系的初步探讨〔J〕。

That is, a wide range of deforestation, desertification of grassland and other factors, which observably impact climate.

大范围的森林砍伐、草原荒漠化等对气候变暖的影响非常显著。

Other patterns of land degradation deforestation, overgrazing, overcultivation, desertification, and salinization

其他形式的土地退化，森林砍伐，过度放牧，荒漠化，和盐碱化减少了净吸收二氧化碳，间接导致了全球气候变暖。

In scores of countries, t he over grazing, overplowing, and overcutting t hat are driving the

在许多国家，受过度放牧、过度耕耘和过度砍伐驱动的荒漠化进程，由于人口和牲畜数量的不

Desertification is a kind of land deserting. It's mainly caused by climate and reasonless human activity.

论文摘要沙漠化是土地荒漠化的一种类型，主要成因是气候因素和人类不合理的生产活动。

At the same time, the case of soil and water loss will be intensified,and the level of salination at western plain region in northeast will be enhanced.

森林植被一旦破坏，很容易荒漠化，造成生态功能衰退，影响与其相邻的草原地带草地沙化面积扩大，盐碱化程度进一步增强。

Soil ecological degradation can be defined as the process and phenomenon of a series of deterioration of soil ecological environment such as structural destruction and functional recession of soil ecosystem, decrease of soil biodiversity and productivity, dcsertification, drought, hardness, acidification and salination of soils, deficit and unbalance of soil nutrients, and loss of soil and water, resulting from human activities and adverse natural environmental conditions.

土壤生态退化是指由于人类活动及恶劣的自然环境条件作用或二者共同作用下造成的土壤生态系统结构破坏、系统功能衰退、土壤生物多样性减少、土壤生产力下降以及土壤荒漠化、干旱化、板结化、酸化、盐碱化和养分亏缺与失衡等一系列土壤生态环境恶化的过程和现象。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。