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: Geosciences >> Geography submitted time 2023-12-16 Cooperative journals: 《干旱区研究》
Abstract： To reveal the survival strategy of plants in semi- arid coal mining subsidence areas faced with soil erosion stress, 2-3-year-old Artemisia ordosica plants were used as the test materials and in- situ root structure destruction tests were carried out at four levels: severe stress (P1), moderate stress (P2), mild stress (P3), and control (CK). The changes in growth indices, photosynthetic characteristics, and physiological traits of A. ordosica were measured. The results showed that soil erosion stress significantly inhibited the growth rate of A. ordosica, and that the greater the degree of simulated damage, the more significant the growth inhibition. After severe stress, the growth rates of plant height, crown width, branch length, and branch diameter of A. ordosica decreased by an average of 36.91%, 43.90%, 69.76%, and 66.76 %, respectively, compared to control plants. Soil erosion stress also conferred a significant negative effect on the photosynthesis of A. ordosica, and the greater the degree of damage, the stronger the negative effect. After severe stress, the net photosynthetic rate, stomatal conductance, intercellular carbon dioxide concentration, transpiration rate, and chlorophyll content of A. ordosica decreased by 39.86%, 59.26%, 7.82%, 51.55%, and 12.33%, respectively, compared to control plants. After 70 days of erosion stress, the activities of superoside dismutase (SOD), peroxidase (POD), and oxidoreductase (CAT) in A. ordosica initially increased and later decreased, and tended to be stable when compared with the control. The malondialdehyde (MDA) content fluctuated within a certain range. Redundancy analysis showed that the level of SOD activity had the most significant effect on the photosynthetic characteristics of A. ordosica. Comprehensive analysis showed that the root fracture of A. ordosica caused by soil erosion in coal mining subsidence areas will reduce its growth rate and inhibit photosynthesis. However, A. ordosica can maintain its growth by regulating the activity of its antioxidase systems and can therefore be considered to be an ecological restoration plant species due to its excellent resistance and adaptability in erosive areas
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