沙丘

In this study,with the psammophilous Caragana Korshinskii-Artemisia ordosica communities on semifixed dunes and fixed dunes in Shapotou region at the southeastern fringe of the Tengger Desert .

本文以腾格里沙漠东南缘的沙坡头地区半固定沙丘柠条-油蒿群落和固定沙丘柠条-油蒿群落为观测样地，选择具有不同类型生物土壤结皮分布的植被群落为观测样方。

In addition,the numerical simulations of moisture behavior in fixed dune during the growth of Nitraria tangutorum and rainless period in June and August were conducted.

以野外实测数据为基础，运用数理统计方法确定非饱和导水率水分扩散率等沙丘水分运动参数，并从宏观角度建立了与水面蒸发强度沙丘水分含量相关的附加根系吸水项的白刺根系吸水模型。

The results from the verification and analysis of dune moisture simulated data showed that the precision of root uptake rate was higher,and it was able to indicate the regularity of water uptake during the rainless period,the predicted moisture distribution curve in the dune profile during Nitraria tangutorum growth season by the use of mathematical model was basically consistent with the measured one.

沙丘水分动态模拟结果的验证与分析表明：根系吸水率精度较高，能较正确反映无雨时段根系吸水规律；用所建数学模型预测的白刺生长期沙丘剖面含水量与实测值分布曲线拟合较好。

These findings indicate that there is plasticity in response to micro\|habitat heterogeneity along the continuous moisture content gradients of sand dunes at the ramet population and clonal fragment levels.

结果表明，准噶尔无叶豆对沙丘坡面水分条件连续变化的异质性小生境存在分株种群及克隆片段两个等级的可塑性响应，并通过可塑性变化适应了沙丘坡面水分条件的分异。

Twelfth hole, 200 yards; The equal to the more famed seventeenth hole, this one shotter plays from dune top to dune top and was a favorite of Hackett's.

第十二洞，200码，在平等的更著名的17洞，这一个 shotter 次从沙丘顶部沙丘顶部，是一个最喜欢的哈克特的。

The field experiments on the near surface airflow, sand transport rate, grain size of the dune sands and the morphology of the dunes show that though shear velocity decreased at the toe of the transverse dune, the threshold shear velocity decreased simultaneously. The decreased threshold shear velocity and unsaturated sand flows at the stoss slope of the dunes resulted the erosion at the toe of the dune.

对简单横向沙丘表面的气流、输沙率、物质结构，以及形态学特征的观测表明，在横向沙丘迎风坡坡脚尽管剪切速度有所下降，但起动剪切速度同时减小，起动剪切速度减小与不饱和风沙流是沙物质在迎风坡坡脚不能产生沉积的主要原因。

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。

The white flanks of the dunes reminded him of the endless promenades of Karen Novotny's body- diorama of flesh and hillock; the broad avenues of the thighs, piazzas of pelvis and abdomen, the closed arcades of the womb.

沙丘白色的侧面使他不由自主地想起卡伦，诺弗特尼那玉体上的无限风光——那是一幅肉体和沙丘的透视画：大腿是广阔的林荫道，骨盆和腹腔是广场，子宫是关闭的拱廊。

These dunes are similar in form, size and cause to those found in the Namib desert on Earth.

这些沙丘在形状、大小和成因上，和地球上的Namib沙漠上的沙丘相似。

A large barchan (crescent-shaped) dune, in a region where some dunes have been observed shrinking over several years.

大型新月形沙丘在一个地区，那里的一些沙丘已经观察几年缩小。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。