流动沙丘

This showed that capacity of water-holding in biological soil crusts were obvious improve,and effected precipitation permeate or water second distribute process.The study results of"fertile islands"formation mechanism in biological crusts showed that biological crusts layer cover could increased nutrients content for below sand soil through precipitation permeate washing,and it promoted plants assimilate more nutriment.The matter import ways of biological soil crusts fertility island had many ways,including the effection of living macrobiotics metabolism in crusts levels,wind-sand flow of near surface,dust deposition and plants decomposition course,etc.Source of particle matter in biological soil crusts was wind-sand flow of near surface,and not dust deposition.Biological crusts layer cover had preserved effection for nature water content in 0-5cm soil layer,compared with the sand of no biological crusts layer,effecting precipitation permeate,and could not obvious restrained from the water evaporate process indoor experiment.

生物结皮层肥岛形成机制的研究结果表明：生物结皮层覆盖能够通过降水淋溶作用而增加下层土壤养分的含量，进而促进植物对养分的吸收；生物结皮层养分输入有结皮生物代谢、降尘、风沙流和植物分解矿化作用等多(来源：A73e3B3eC论文网www.abclunwen.com)种途径，但生物结皮层的颗粒物质来源主要是近地表风沙流，而不是大气降尘；生物结皮层覆盖对0-5cm土层自然含水量有一定的保护作用，并影响降水向深层渗透，不能有效的阻止表层水分的蒸发进程；研究表明采取人工促进技术能够在流动沙丘上形成生物结皮层，实现流动沙地的快速治理。

In the enzyme activities, the increase of saccharase activity is the most significant, and the soil content at depth of 0~10 cm under the 6-and 11-year C.

土壤酶中蔗糖酶的活性增加最为迅速，6年和11年生固沙林0~10 cm土层分别是流动沙丘的28.58倍和55.2l倍。

At the South Edge of the Tengger Desert, the sampled sites of mobile sanddune, semi-fixed sand-dune 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 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。

The results showed that the total vegetation coverage, shrub and undershrub coverage decreased; herbage coverage increased.

结果表明：从固定沙丘、半固定沙丘到流动沙丘，总盖度、灌木盖度下降，草本盖度增加。

Results showed that total vegetation coverage, herbaceous coverage, and species richness were all decreased, and perennial species gradually gave place to psammophyte annuals, shrubs, and semi-shrubs from gentle slope hilly ridge, through saline bottomland and fixed and semi-fixed dune, and to shifting and semi-shifting dune.

结果表明，从缓坡丘陵梁地，经盐化丘间低地、固定半固定沙地到流动半流动沙丘，植被总盖度、草本植物盖度、物种丰富度均呈下降趋势；植被组成中多年生草本植物逐渐减少，一年生草本植物及沙生灌木、半灌木逐渐增加。

At first,ecological mat can effectively reduce soil temperature of the soil layer from 0 cm to 15 cm,in detailed,the average daily soil temperature can decrease 2.06℃ to 4.56℃,which is benefit to reduce soil evaporation in high temperature;During the rainless period,the soil moisture content covered by ecological mat is much higher than mobile sand,especially,the soil moisture content of the layer form 0 cm to 15 cm always keep ...

首先生态垫能够显著降低沙地0~15 cm的土壤温度，日均温可降低2.06~4.56℃，有利于沙地高温条件下减少土壤蒸发；在连续无降雨的情况下，生态垫下各层次的土壤含水量都高于流动沙丘裸地，尤其是15~30 cm含水量相对稳定，人工植被建立后，其保存率、生长量较流动沙地均有较大幅度的提高。

Forty years of re-vegetation, mainly by xerophytic shrubs Artemisia ordosica Krasch and Caragana korshinskii Kom, in the Shapotou Desert Experimental Research Station has established a dwarf-shrub and herbaceous cover on stabilized sand dunes.

：在草原化荒漠带沙坡头地区，利用草方格沙障并栽植灌木柠条和半灌木油蒿对流动沙丘进行固定，经过40a的演变，逐渐形成由矮灌木与草本植物覆盖的固定沙丘景观。

After using the forestation method of spray sowing and inserting dry seedlings, the area of fouryearnaturalregeneration poplar and willow has taken up 5 percent of controlled area, with the area of artificialspraysowing poplar and willow taking up ten percent and the area of artificialspraysowing shrub and herbage ta...

采用喷播和深松插干造林方法，4年天然更新的杨树和柳树占治理面积的5%左右，人工栽培的杨树和柳树占10%，人工喷播的灌木、牧草占10%。在沙丘上部植被覆盖度由10%～15%增加到40%～50%，丘间低地和风蚀洼平地由50%～60%增加到75%～85%。流动沙丘初步恢复为疏林草地型固定与半固定沙丘。

To make sure of the characteristics of Landform in Aer sand-fixation area, a related investigation was conducted , the results shows that Aer sand-fixation area can be divided into five kinds of landforms , namely wandering dune , semi-wandering dune , fixed dune , wind-erosion flatting area and Low-Lying interspaces between mountains .

调查结果表明，彰武县阿尔乡围封沙地按地貌特征可分为五种地貌类型：即流动沙丘、半流动沙丘、固定沙丘、风蚀洼平地和丘间低地。

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。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。