荒漠

Different desertification around the world, including Turkestan Mojave Desert and desertification, are Ya terrain.

世界各地的不同荒漠，包括突厥斯坦荒漠和莫哈韦沙漠在内，都有雅丹地形。

According to the results of sampling and cluster analysis, the rodent community in the Junggar Basin can be divided into four types: 1farmland community dominated by Cricetulus migratorius and Mus musculus; 2saxideserta community dominated by Meriones erythrourus and C.migratorius; 3residential area community dominated by Rattus norvegiens and Mus musculus; 4haloxylon eremic community dominated by Dipus sagitta and Meriones meridianus.

对准噶尔盆地的抽样调查，经聚类分析，该地区的鼠类可划分为4种群落：(1)以灰仓鼠+小家鼠为主的农田鼠类群落；(2)以红尾沙鼠+灰仓鼠为主的砾石荒漠鼠类群落；(3)以褐家鼠+小家鼠为主的城镇居民点鼠类群落；(4)以子午沙鼠(M.meridianus)+三趾跳鼠为主的梭梭荒漠鼠类群落。

The results show that NPP is larger in June and July than other growth periods, grass LAI and NPP change rapidly from May to June. Estimated error of 44 cases by the biomass model is less than 20%, which show that the biomass model is very good , the model can describe growing status. Photosynthesis and respiration are different because of different type grass , three types grass are more adaptive to desert environment and the biomass are also big, the grass types include Alhagi sparsifolia, Lycium ruthenicum and Reaumuria songarica. The grass biomass is influenced by many factors such as grass type, total cover and plant height et al.

结果表明，2005年牧草生长期内NPP的变化基本是6、7月份最大，其它月份较小，5～6月份是牧草叶面积变化比较大的时期，也是NPP变化比较显著的时期；生物量模型估算得到的44个样本的生物量误差基本都小于20%，说明模型能够反映牧草的实际生长状况；不同荒漠牧草对光的利用能力和对CO2同化能力有很大差异，骆驼刺、红砂、黑果枸杞是荒漠牧草生物量较大的牧草类型；牧草类型、牧草盖度以及平均高度是造成不同牧草产量相差较大的重要原因。

The soil had the alkalize characteristic, and the decisive factors were terrain, texture and precipitation, so before the haloxylon ammodendron settled down, the soil had the alkalize characteristic, and the haloxylon ammodendron was alkali-resistant plant, but if the total alkalinity excessively high, the haloxylon ammodendron also grew difficulty.

土壤具有碱化特征，主要是由地形、质地、降水等结构性因素决定的，由此得出荒漠植被梭梭定居之前土壤就具有了碱化特征，梭梭是耐碱性荒漠植被，但总碱度过高的区域梭梭也难以生长，因此土壤酸碱度仍然是该区域影响梭梭生长和分布的重要因子。

It expanded to 106119ha in 1973, descented to 99167ha in 1987, backed up to 112440ha, and attained the max value in history—123170ha in 1998 and descent to 109934ha again in 2001. GIS overlaying analysis shows that, the spatial change of Minqin Oasis had the different characteristics in different stage in the last 50 years: at the end of 50's to the beginning of 70%, oasis expandation Was performed by extension of origin oasis; the atrophia of oasis from the beginning from 70's to the 80's was performed by increasing of non-oasis spot pieces of inner part for oasis; the main performance of keeping on expanding of oasis from late 80's to late 90's is outside extension of Baqu oasis near the upper stream, with increased oasis area in interior of hungriness and increased area of non-cultivation in Huqu oasis in the north. From 1998 to 2001, opening up wideness in interior of hungriness continued, but hnngrinessization of oasis became worse. The oases in the Minqin Basin developed from small to large and back to small in terms of area changes, and from south to north then to south in terms of spatial changes.

绿洲分布图的GIS叠加覆盖分析表明，近50年来民勤绿洲的空间变化在不同阶段有不同的特征：50年代末至70年代初，绿洲扩展主要表现为已有绿洲的外延式扩大；70年代初至80年代后期的绿洲萎缩，主要表现为绿洲内部非绿洲斑块增加；80年代后期至90年代后期的持续扩展，主要表现为靠近上游的坝区绿洲向外围扩展和荒漠腹地绿洲面积的增加，而北部湖区绿洲弃耕面积不断扩大；98年至2001年，绿洲荒漠腹地的开荒还在继续，但湖区的绿洲荒漠化还在进一步加剧。50年来民勤绿洲的发展总体上经历了一个面积由小到大再到小，空间位置上从南而北再向南的迁移过程。

The phenology of eight early spring ephemeral plants in Brassicaceae which are common in North Desert of Xinjiang,China were observed.

对8种广泛分布于新疆北部荒漠的十字花科早春短命植物物候特征及其对荒漠环境的适应进行了观测与分析。

Base on comparison with the remote sensing data in 1982 and 2000 and field investigation, the results of land cover and land use change were obtained by the method of landscape analysis. Ten types of land use were identified: riparian woods, riparian shrubbery, desert shrubbery, desert grassland, river-way and water area, salinised land, town, Gobi, shift sand dune, denudative upland. The results show that,(1) there were obvious changes in land cover structure.

根据黑河下游额济纳绿洲土地生态分类，利用1982年与2000年2期TM遥感数据对比和野外实地调查，采用景观生态空间分布格局分析方法，分为河岸乔木林、河岸灌草林、荒漠稀疏灌丛、荒漠稀疏草地、河道与水域、盐碱化土地、城镇、戈壁、流动沙丘和剥蚀地山丘陵，从各类土地分布面积变化和类型转移趋向与幅度两个方面，分析了额济纳绿洲20年来土地覆被变化。

Minqin desert area belongs to the typical droughty desert shrubs and its vegetation coverage only comes to 5% desert climate and its 15%.

民勤沙区属于典型的干旱荒漠气候，植被以灌木荒漠为主，盖度一般只有5%~15%。

In this thesis, we chose two wild rodents inhibiting in the north of China Mongolian gerbil (Meriones unguiculatus and Brandt's vole . The effects of short photoperiod and cold exposure to thermogenesis, and the mechanism of thermogenic regulation were studied. The new genes participating in cold adaptation were also screened by DDRT-PCR.

本文选择了华北地区的两种野生啮齿类（生活在内蒙古荒漠和半荒漠地区的优势鼠种长爪沙鼠和生活在内蒙古干旱草原的优势鼠种布氏田鼠）为研究对象，探讨光照对长爪沙鼠产热的影响，以及在低温因子作用下两种鼠适应性产热变化的机理，并利用差异显示技术试图寻找与冷适应性产热相关的基因。

Soil microbiotic crusts are widespread in arid and semiarid regions, they are one of the major components of desert ecosystems, and their importance has been demonstrated by numerous researches.

：生物土壤结皮广泛分布在干旱半干旱地区与寒区荒漠，是荒漠生态系统的主要组成和景观特征之一，其重要性已被大量的研究报道所证实。

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。