Subjects: Geosciences >> Geography submitted time 2024-03-01 Cooperative journals: 《干旱区研究》
Abstract： Mastering the regional wind sand movement environment and sediment particle size characteristics isthe key to studying wind sand flow, and is of great significance for the prevention and recovery of regional windsand disasters. Based on the wind regime data of Wuzhumuqin Sandy Land, this paper studies the variationcharacteristics of sand driving wind regime and sand transport potential, and reveals the spatial differences ofsand environment in this area by combining with the sediment particle size data. The results show that:（1）Theannual average frequency of sand blowing in the Wuzhumuqin sandy land is 33.8%, with an average wind speedof 3.34-5.40 m·s-1, and an average sand blowing wind speed of 6.46-8.49 m·s-1. The frequency and wind speedof sand blowing in the north of the sandy land are greater than those in the south, and those in the west are greaterthan those in the east.（2）The overall annual frequency and wind speed of sand storms are the highest in spring.The wind direction of sand storms is mainly in the southwest direction, and the frequency in the WSW directionis the highest. （3）The sand transport potential in the sandy land is 19.2-193.7 VU, which is generally a low windenergy environment. The wind conditions are mostly sharp bimodal wind conditions. The sand transport potentialin the north of the sandy land is greater than that in the south, and that in the west is greater than that in the east.Throughout the year, sand material is transported to the east and northeast, and spring is the most importantperiod of wind sand activity.（4）The sandy land is mainly composed of coarse and medium sand components,with soil particle sizes in the south and west being coarser and finer in the east. The sorting of sediment in thenorthern and eastern parts of the sandy land is poor, and the particle size components are greatly influenced byexternal factors. Overall, the sandstorm activity in the northern part of the sandy land is the strongest, making itsuitable for artificial planting or laying sand barriers to fix sand. Protection forest is planted in the east of thesandy land to avoid the continuous eastward movement of sand.
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: Biology >> Botany submitted time 2023-03-28 Cooperative journals: 《干旱区研究》
Abstract： Nitraria tangutorum nebkha is a common natural landscape in the desert- oasis ecotone of Jilantai; however, the growth characteristics of N. tangutorum shrubs and the morphological characteristics of N. tangutorum nebkhas under different background vegetation coverages remain unknown. Through the measurement of shrubs and morphological characteristics of N. tangutorum nebkhas, the variability of morphological parameters of N. tangutorum nebkhas and the relationship between the growth characteristics and morphology of N. tangutorum nebkhas were quantitatively analyzed under different background vegetation coverages. The influence of background vegetation coverage on the succession of N. tangutorum nebkhas was also discussed. Results showed that: (1) the evolution of N. tangutorum nebkhas was stable under four different background vegetation coverages. The morphological parameters of N. tangutorum nebkhas gradually developed toward large scale and small density with the increasing background vegetation coverage. (2) Overall, a good correlation was found between the morphological parameters of N. tangutorum nebkhas under different background vegetation coverages. (3) In the desert-oasis ecotone of Jilantai, the relationship between the L and W of N. tangutorum nebkhas followed a quadratic or power function, and the relationship between the A and V of N. tangutorum nebkhas followed a power function. Except for sample site 1, the relationship between A and H and between H and D followed linear trend and power function, respectively. (4) The coverage of N. tangutorum nebkhas was mainly 40%- 80%, accounting for 64.62% of total N. tangutorum nebkhas in the desert- oasis ecotone of Jilantai. This finding indicated that the N. tangutorum nebkhas in the study area is well grown, widely developed, and temporarily not a source of wind and sand damage to the oasis.
Subjects: Environmental Sciences, Resource Sciences >> Basic Disciplines of Environmental Science and Technology submitted time 2020-04-26 Cooperative journals: 《干旱区研究》
Abstract：为了探究西鄂尔多斯地区荒漠灌丛的光合生态适应性，以4种天然荒漠灌丛半日花(Helianthemum songaricum)、红砂(Reaumuria songarica）、沙冬青(Ammopiptanthus mongolicus )、霸王(Sarcozygium xanthoxylon）为研究材料，利用Li-6400便携式光合测定仪野外原位测定荒漠灌丛日光合动态和季节动态规律。结果表明：① 不同季节灌丛光合作用适宜的温度存在差异，高温环境使灌丛净光合速率最适温度升高，低温环境使其降低。② 不同季节4种灌丛的净光合速率、蒸腾速率、水分利用效率和气孔导度日变化曲线趋势为“双峰形”，胞间CO2浓度日变化曲线趋势为“W形”，但不同季节各指标平均日变化趋势表现各异。③ 不同季节灌丛净光合能力表现为：沙冬青>霸王>红砂>半日花，说明沙冬青具有较强的生态适应性。④ 净光合速率和蒸腾速率日变化趋势几乎保持同步状态，表明4种灌丛叶片气孔对外界环境变化反应敏感。⑤ 水分是限制荒漠灌丛生长发育的关键因素。为了保证荒漠植物的群落稳定性和生物多样性，在夏、秋季需对沙冬青、半日花、红砂和霸王进行水分管理。
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。
Subjects: Geosciences >> Other Disciplines of Geosciences submitted time 2019-09-11 Cooperative journals: 《干旱区研究》
Abstract：基于自然灾害风险理论，选取森林雪灾相关的气象、林业、基础地理信息和社会经济等数据，从致灾因子危险性、承灾体易损性、孕灾环境敏感性和防灾减灾能力4个方面综合评估内蒙古森林雪灾风险程度的地区差异，利用加权综合评分法、层次分析法建立并计算森林雪灾综合风险评估指标体系及指数，构建出内蒙古森林雪灾风险区划模型。内蒙古森林雪灾高风险区、次高风险区分别占全部森林雪灾风险区的77.18%、0.05%，且均位于内蒙古东北部的呼伦贝尔市。中等风险区占全部森林雪灾风险区的6.01%，主要位于锡林郭勒盟、呼伦贝尔市、赤峰市及兴安盟，分别占中等风险区总面积的0.61%、36.50%、9.11%和5.99%；次低风险区和低风险区占全部森林雪灾风险区的16.76%，主要位于阿拉善盟、鄂尔多斯市、兴安盟等地。内蒙古森林雪灾风险呈现自东北向西南逐渐减轻的趋势，与森林、积雪空间分布规律基本一致。
Subjects: Geosciences >> Other Disciplines of Geosciences submitted time 2019-09-09 Cooperative journals: 《干旱区研究》
Abstract：以吉兰泰荒漠绿洲过渡带为研究区，通过对不同生境条件下的白刺（Nitraria tangutorum）灌丛沙堆形态特征、各形态参数间关系及白刺灌丛生长特征进行定量分析。结果表明：① 随着梭梭（Haloxylon ammodendron）林龄的增加（白刺纯林除外），白刺灌丛沙堆各形态参数变化范围较大，并向长椭球形方向发展，部分向不对称“蝌蚪状”方向演化。② 4种不同生境条件下，白刺灌丛沙堆各形态参数相关系数均在0.782以上（P0.721 7）和幂函数、二次函数关系（R2>0.835 1）且斜率均为正，表明4种生境灌丛沙堆均处于发育阶段。④ 白刺灌丛株高和盖度对灌丛沙堆形态特征有明显影响，即白刺灌丛株高越高、盖度越大，白刺灌丛沙堆高度、底面积和体积也逐渐增大。
Subjects: Environmental Sciences, Resource Sciences >> Basic Disciplines of Environmental Science and Technology submitted time 2018-06-10 Cooperative journals: 《干旱区研究》
Abstract： 为了进一步厘定西鄂尔多斯高原地区5种天然荒漠灌丛土壤碳排放的主控因子，估算灌丛土壤碳排放量并阐明不同灌丛土壤的碳排放特征，选用5种典型荒漠灌丛林为研究对象，通过土壤碳通量ACE（automated soil CO2exchange station）监测系统分别测定了5种灌丛土壤呼吸速率、土壤温湿度及碳排放量。结果表明：①5种灌丛土壤碳排放速率日动态总体呈现不对称钟形单峰曲线特性，峰值在11:3013:30。5种灌丛生长季土壤碳排放速率均显著高于非生长季，其中半日花灌丛（Helianthemum songaricum Schrenk）比其他灌丛高0.76～1.67倍。土壤年均碳排放量沙冬青灌丛为8090.63 kghm-2a-1、四合木灌丛7868.16 kghm-2a-1、霸王灌丛7287.40 kghm-2a-1、半日花灌丛8375.69 kghm-2a-1和红砂灌丛7618.47 kghm-2a-1；②在3种未来气候情景（低排放情景B1、中等排放情景A1B和高排放情景A2）下，5种灌丛土壤碳排放量将比基准情景高达8.30%，其中霸王灌丛变化最为明显。不同类型灌丛地土壤碳排放对气温变化的响应存在差异，但差异不显著。本研究可为全球环境变化下中国西北干旱、半干旱地区碳平衡估算提供数据基础和参考依据。
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