Subjects: Geosciences >> Other Disciplines of Geosciences submitted time 2019-09-10 Cooperative journals: 《干旱区研究》
Abstract：以乌海市晟辉能源技术公司沙区太阳能光伏电场为研究对象，对光伏矩阵内光伏板的前沿、后沿及光伏阵列行道处风沙输移情况进行观测，研究沙区光伏电站的风沙流输移规律。研究表明：① 各观测点输沙量均随着高度的增加呈降低趋势，光伏板前沿、后沿、行道处各观测点输沙量随高度增加的最佳拟合方程均为多项式函数，且R2均大于0.95，拟合结果可信。② 光伏板前沿、后沿处风沙流结构特征值大于1，风沙流呈非饱和状态，地表表现为风蚀。电场矩阵行道处风沙流结构特征值均小于1，风沙流为饱和状态，地表表现为堆积。由于光伏板对风沙流的导向作用，导致光伏板下方形成气流加速区，光伏板下方出现掏蚀现象，因此光伏板下方为场区内部风沙防治的重点区域。③ 光伏矩阵内部各观测点的输沙量均低于旷野处，且随着深入电站内部输沙量逐渐降低。沙区光伏电站控制沙害的关键位置为电站迎风边缘处。
Subjects: Agriculture, Forestry,Livestock & Aquatic Products Science >> Soil Science submitted time 2023-05-30 Cooperative journals: 《干旱区研究》
Abstract： Abstract：This study was conducted to explore the influence of desert shrubs and their associated species on soil particle size and nutrient spatial heterogeneity under shrubs. The mixed community of Ammopiptanthus mongolicus and Sarcozygium xanthoxylon and a single plant of A. mongolicus in the Western Ordos National Nature Reserve were selected as the research samples. The surrounding bare sandy land without vegetation cover was used as control. The soil particle size characteristics, nutrient accumulation changes, and the relationship between nutrients and particle size composition under different shrub distribution types were analyzed. The results were as follows: (1) Compared with the mixed community of A. mongolicus-S. xanthoxylon, the volume percentages of soil clay, silt, and fine sand of the single A. mongolicus increased by 0.8%, 0.8%, and 0.71%, respectively. As the types of shrubs decrease, soil particle size became smaller in turn, sorting deteriorated, the fractal dimension became smaller, the soil particle distribution gradually became asymmetric, and the particle composition was concentrated at fine particles. (2) The contents of soil organic matter and alkali- hydrolyzable nitrogen increased by 1.85 g·kg-1 and 8.18 g·kg-1, respectively, with the increase in shrub species. The accumulation of organic matter and available phosphorus by a single A. mongolicus was stronger than that by A. mongolicus-S. xanthoxylon; however, the accumulation of alkali- hydrolyzable nitrogen was slightly poor than that of A. mongolicus-S. xanthoxylon. (3) A. mongolicus-S. xanthoxylon available soil phosphorus content was significantly positively correlated with fine sand content (P<0.05), and A. mongolicus available soil nitrogen and potassium were significantly positively correlated with coarse sand (P<0.05). A. mongolicus-S. xanthoxylon can effectively promote soil granulation and significantly improve soil nutrients. However, the presence of the associated species S. xanthoxylon reduced the enrichment of organic matter and available phosphorus by A. mongolicus.
Subjects: Geosciences >> Other Disciplines of Geosciences submitted time 2019-09-11 Cooperative journals: 《干旱区研究》
Abstract：通过野外试验探究了流动沙丘中上部导风板板后作用区风速特性和输沙量特征，结果表明：不同角度导风板对板后风速增加的区域有所不同，作用区内最大风速一般出现于板后1.5 m，45°导风板对于板后1.5 m处风速加速效果明显，板后3.0 m处则是25°导风板加速效果较为明显，而在板后4.5 m处影响效果明显的导风板角度为35°。导风板可以有效的提高板后输沙总量，其中30°~45°区间的中等角度导风板对于输沙量的提升具有明显效果，45°导风板对于板后1.5 m处输沙量提升效果较高，而40°导风板对于板后3.0 m处输沙量提升效果较高，在板后4.5 m处则是30°导风板提升效果较高。
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