半固定沙丘

土壤pH值在滩地和固定沙丘的空间分布符合球状模型且空间自相关显著，但在半固定沙丘空间自相关不显著；

The soil pH did not exhibit significant autocorrelation in the semi - fixed sand dune but it did significant autocorrelation in the meadow and the fixed sand dune , both fitting the spherical model .

与固定和半固定沙丘相比，流动沙丘表面水分（即7～8mm以内的降水）最易在短期内蒸发损耗。

In contrast with fixed and semi-fixed dunes the moisture in the surface of shifting dunes would vapor most likely ( i.e. under 8 mm precipitation ) in a short time .

固定和半固定沙丘花棒克隆生长构型的比较研究

A Study on the Patterns of Clone Growth of Hedysarum scoparium on Fixed Dunes and Semi-fixed Dunes

种子自然繁殖一般出现在低缓的流动、半固定沙丘和平沙地上；

The regeneration by seeds usually takes place on shifting , semi-fixed dunes and flat sandy areas .

小叶锦鸡儿群落是科尔沁沙地固定、半固定沙丘具有代表性的人工固沙植物群落之一，其群落种类组成，群落特征均趋于不断稳定和完善。

Caragana microphylla community is the typical one of artificial sand binding plant communities in Horqin Sandy Land .

围封3-5年的恢复中期，半固定沙丘向固定沙丘转变；

Second , the intermediate stage is within 3-5 years of closure , the semi-fixed sand dunes being gradually stabilized .

固定沙丘、半固定沙丘和流动沙丘的土壤种子库中植物种类间的相似性系数都比较大。

The similarity of soil seed banks in fixed dune , semi-fixed dunes and moving dunes were bigger . 4 .

不同沙丘类型白刺地上生物量变化明显，半固定沙丘白刺生物量最大。

The change of biomass on different Nitraria tangutorumdune was evident , among which the biomass of semi-fixed dune was maximum .

流动沙丘、半固定沙丘前移规律年、季变化明显，但二者的移动速度不同。

Movement rules of active dune and semi-fixed dune vary obviously with years and seasons , but their moving velocities are different .

在退化荒漠草原区，种植柠条林后比未种植前的半固定沙丘地上植被物种数、植株数均明显增加。

In regress desert grassland , ground vegetation species and number are significantly increased in planting Caragana forest than not planting area .

移动沙丘和半固定沙丘分选较好，表现出极强的正偏和较尖的峰值；

The particle-size classification of moving dune and semi-fixed dune was better , which showed a strong positive bias and a sharp peak .

抛物线沙丘是一种发育在土壤、水分、植被条件较好的内陆荒漠地区以及沿海地带的固定半固定沙丘地貌类型。

Parabolic dunes is a developmental fixed and semi-fixed sand dune landform type in good soil , water , vegetation conditions inland desert areas and coastal zones .

经计算半固定沙丘治理开发及庄园式沙地治理开发的评价值分别为2.0232和2.3245，均大于优化值1.5。

Assessment values of control and developing of unstable dunes and sandy lands are 2.023 and 2.324 5 , respectively , that are 1.5 more than the optimum .

研究结果表明，区域沙丘属于半固定沙丘，移动速度缓慢，全区的沙化地总体表现为负增长。

The result suggests that the sand dune is characterized by semi-active dune , the move speed is very slow , and all round the district desertification shows negative increase .

固定和半固定沙丘的大部分背风面的含水量比迎风面的含水量高，而流动沙丘却恰恰相反。

The soil water content in most leeward side of fixed and semi-fixed dunes were higher than those in windward side , however , moving dunes were just the opposite .

5固定沙丘、半固定沙丘与平沙地土壤种子库与地上植被具有明显的相似性，流动沙丘没有明显的相似性。

There were obvious similarities between soil seed bank and aboveground vegetation in fixed dunes , semi-fixed dunes and flat dunes , but there was no obvious similarity in moving dunes . 6 .

固定半固定沙丘的植物种子表现为持久土壤种子库类型Ⅲa，并且随土壤深度增加，土壤种子密度显著下降。

Soil seed bank type of fixed and semi-fixed sand dune was persistent soil seed bank ⅲ a , and the deeper the soil depth was , the fewer the soil density was .

半固定沙丘上的黄柳根系最发达（根系分布深，数量大），固定沙丘的黄柳明显不及前者，而丘间低地的黄柳根系最不发达。

The population in the semi fixed sand dunes had the most developed root systems , followed by the population in the fixed sand dunes , and that in the inter dunes lowland was the last .

与固定半固定沙丘相比，流动沙地丘间低地土壤各层水分处于高含水量状态，说明固定沙地的植物蒸腾和土壤蒸发耗水量大于流动沙地丘间低地。

Compared with the fixed or semi-fixed dunes , the lowland among moving dunes showed high soil water content , and this explained that plant transpiration and soil evaporation of fixed dunes were larger than the moving dunes .

人工植被的固定沙丘结皮层土壤微生物数量多，土壤酶活性强，结皮层较厚，韧性也强，其次是半固定沙丘结皮层。

The research showes that in the sand dunes which were fixed with artificial vegetation and had formed a thick and tenacious crust , the soil microbe population was in large amounts , and enzyme activity was strong .

同时，使流动沙地向半固定、固定沙丘方向转化。

At the same time , the mobile sand dunes become to be semi-fixed and fixed sand dunes .

流动沙丘面积和斑块数由1958年的916hm2和70块增加到了1981年的9221hm2和300块，半流动、半固定和固定沙丘的面积逐渐减少。

Shifting dune cover and patch numbers increased from 916 hm 2 and 70 of 1958 to 9 221 hm 2 and 300 of 1981 , respectively , while those of semi shifting , semi fixed and fixed dunes decreased .

水分生态位适宜度表现为流动沙地>半固定沙地>固定沙地。种子自然繁殖一般出现在低缓的流动、半固定沙丘和平沙地上；

Key Results CVI was remarkably low on fixed sandy land , indicating that the ecological function of the population was weakened . The regeneration by seeds usually takes place on shifting , semi-fixed dunes and flat sandy areas .