Subjects: Geosciences >> Geography submitted time 2024-03-01 Cooperative journals: 《干旱区研究》
Abstract： The biological soil crust is important for maintaining stability in desert ecosystems. Therefore, the useof sand barriers as auxiliary measures to promote the formation and development of biological soil crust in aridareas is of great significance. In this paper, the effects of sand fixation by sand barriers (straw checkerboard,nylon grids, and covered nets) on the formation and development of biological soil crusts were studied usingmicrobial high- throughput sequencing combined with soil physical and chemical properties determination. Theresults showed that the crust thickness under the covered nets was the thickest, although the colors of the crust inthe straw checkerboard and nylon grids were similar to that of the algae crust. The proportions of clay andpowder particles in the crust of the three types of sand barriers for sand fixation were significantly higher thanthat of the moving sand. The nutrition degree of the crust in the covered nets was the highest, indicating thehighest degree of soil formation. From the composition analysis of fungi, bacteria, and blue-green algae in crustsfrom the three types of sand barrier, it was found that the proportions of Cyanobacteria and Leptolyngbya in thecrust in the covered nets were higher than those in the crust in the straw checkerboard and nylon grids. Incontrast, the proportions of Dothedeomycotes and Microcolleus were lower, and the number of unique microbialOUT was highest. Based on the previous process of soil crust formation and microbial succession in arid areas, itwas inferred that the degree of crust development in the cover nets was likely higher than that in the strawcheckerboard and nylon grids and that their formation and development trajectory differ. Therefore, among thethree types of sand barriers, the covered nets for sand fixation were more suitable for biological soil crustformation and development.
Subjects: Geosciences >> Other Disciplines of Geosciences submitted time 2019-09-10 Cooperative journals: 《干旱区研究》
Abstract：根据中国科学院临泽内陆河流域站2004—2014年的土壤温度与气象要素数据，分析了河西走廊中部荒漠-绿洲过渡带土壤温度年内和年际变化规律及主要影响因素。结果表明：土壤温度日变化与月变化大致呈正弦曲线，各层土壤最高、最低温度出现的时间随着土壤深度的增加逐渐推迟；年均土壤温度总体上随着土壤深度的加深先减小后增加；气温是与土壤温度变化相关性最强的气象要素；同时，明确了该区3个特征差异明显的土壤温度层次：0~20 cm土壤温度活跃层，40 cm土壤温度过渡层和60~100 cm土壤温度稳定层，与其他地区结果有所差异。最后，利用相关性分析、多元逐步线性回归方法建立了气象指标与各层土壤温度之间经验预报方程。
Hits
Hits
Downloads
Comment