沙漠化

Planting out the approved Australian desert reversal, C4 photosynthesis pathway Bin Li Atriplex nummularia reverses sandification desertification and makes soil and soil carbon.

种植在澳洲被证明能有效逆转沙漠化的植物。滨藜C4光合途径能逆转土地沙化和沙漠化并释出土壤和土壤碳。

From these data, the desertification has developed based on the fluctuating humidity before 1980s and reverse after 1980s in study area. The results from analysis on climate and land use change in late 50 years show that changefully precipitation is the main natural background that...

对研究区近50a来的气候及土地利用方式变化的分析表明，气候因素中降水的多变性是研究区土地沙漠化发生的自然背景，而滞后于气候变化的土地利用方式改变则是研究区沙漠化最主要的成因。

Climatic changes are both a consequence and a cause of desertification.

气候变化既是沙漠化的后果，也是沙漠化的成因。

It indicates that speed of desertification in pasturing areas is faster than that of agri-grazing-oecotone and there has universally exited an increasing serious phenomenon of desertification in recent years.

结果表明，近年来，研究区普遍存在沙漠化加剧的现象，牧区土地沙漠化发展的速度快于农牧交错区。

Based on the GIS,RS,GPS and PRA,the impact of water resources on desertification and pauperization in the Minqin basin is studied.

以3S技术与PR A工具，通过对民勤盆地水资源状况的变化与沙漠化、贫困化发生发展规律对比研究，表明自然条件恶劣、基础设施弱是沙漠化、贫困化产生的内在因素，而人类活动则是强大的驱动力。

Some conclusions from the study on human driving factor are:(1) the human activity is much more active factor to the process of desertification which mainly incarnates on the changes of the landuse fashion (from traditional rangeland 100 years ago come to interlacing agro-pastoral region) and enhance of landuse intensity (over-cultivation, over-grassing and over-fuel collection);(2) the natural vegetation had been destroyed suicidally by human activities that had accelerated to the development desertification.

在人为驱动力的分析中，得到以下一些初步的结论：（1）人类活动是本地区沙漠化过程中更加活跃的驱动因子，体现在土地利用方式的转变（从传统的牧业草原到今日的农牧交错区）和强度的增加（过度开垦、放牧、樵采等）；（2）由此对自然植被群落毁灭性的破坏，加速沙漠化的进程。

The analysis of chorological and spatial changes of desertification indicates that expansion of desertification mostly takes place around the four main sandy lands: Keerqin, Hulunbeier, Hunshandake and Maowusu, while situation in the central part of sandy land is kept relatively steady, with some part of these areas tending to take a favorable turn.

通过沙漠化时空演变过程分析表明：沙漠化的发展主要集中在科尔沁沙地、呼伦贝尔沙地、浑善达克沙地和毛乌素沙地的边缘，而沙地的内部则相对稳定，部分地区有逆转的趋势。

Therefore, in order to control desertification effectively, we should not only deeply understand the physical environment factors, but also pay more attention to human activities resulting in desertification in the headwater area of the Yellow River.

黄河源区自然因素与人为因素共同作用，互相激发，最终导致沙漠化的不断扩展及其程度的日益加重。在本区沙漠化的治理、生态环境恢复中，既要认识到生态环境的脆弱性，更要重视人为因素的负面影响。

The most serious desertification occurred in southeast of MuSu Desert,then appeared inferior degree in midst,north,south and east,anddegression degree in other directions.6.The changes of environment in Mu Su Desert in historical times havebeen controlled by climatic changes in temperature and drought-wetwithin hundreds or thousands years.At present,it came into being suchspatial structure and environmental characteristics fordesertification land because of being relative to other naturalgeographic characters and human activities.In all that,physiognomyand hiemal wind are the driving factors.The sandy matter in stratumis the physical fountain factor.The depravation of surface water inthis region is one of representations of environmental changes, meanwhile,it is also the factor which leads to the degradation ofvegetation and desertification.On the whole,human activity has actedupon these natural elements,becoming a dominant factor in the regionalenvironment changes since Ming and Qing dynasty.7.Influencing of human activities on the environment of Mu Su Deserthad occurred before Qin dynasty,and its intensity of earlier influencewas so slight that it could not cause a large scope and long timeenvironmental changes.

沙漠化的程度是东南部最强，中北部、南部和东部次之，而后向其他方向递减。6、毛乌素沙地历史时期的环境变化是受百年乃至千年尺度的气候冷暖、干湿变化控制的，之所以形成目前这样的沙漠化土地空间分布格局和环境特征，则与其地的自然地理特征和人类活动有密切关系，其中地貌及冬季风是动力因素；地层中的沙物质是物源因素；地表水环境恶化是区域环境变化的表现之一，同时又是植被退化和沙漠化的引致因素；人类活动总体上是叠加在自然因素之上的，只是明清以来在局地环境变化中成为主导因素。7、毛乌素沙地人类活动的环境影响在先秦时期就已出现，早期的影响程度是轻微的，不足以造成大范围、长时段的环境变化。

At the South Edge of the Tengger Desert,the sampled sites of mobile sanddune, semi-fixed sanddune and fixed sanddune were selected as the different stages of the reversion process of desertification with the method of substituting time with space, and topsoil mineral elements of the decertified land were studied in reversion process of desertification.

以腾格里沙漠南缘沙漠化土地为研究对象，应用时空替代法选择流动沙丘、半固定沙丘、固定沙丘的沙漠化逆转序列样地，研究了沙漠化逆转过程土壤矿质元素的变化特征。

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。