| Biocrusts distributed widely in northwest arid and semi-arid regions, is an important ecosystem part of this region’s. Biocrusts ’ growth and development can improve the ability of resisting wind erosion in sandy land. Earlier studies have explored the feasibility of artificial cultivation biocrusts and effectiveness of biocrusts in prevention and control wind erosion from different perspectives in the Loess Plateau and the northwest desert region, however, combining research of the artificial cultivation of biocrusts and photovoltaic power plant construction project wind erosion control in northwest sand area is rarely reported. In this experiment, using the Mu Us Desert photovoltaic project trail construction as the research area,we explored the optimal nurturing types of biocrustss that is suitable for this area and the effect of PAM in biocrustss artificial cultivation in this region. Simultaneously, artificial cultivation of biocrustss were used to study the benefits and erosion prevention mechanism in the region.The main conclusions are as follows:(1)Effecting factors of biocrustss artificial cultivation in Northwest Sandy Area photovoltaic project construction slashArtificial sow cultivation biocrust is feasible in the region that precipitation is about 400 mm. The optimum measures are: inoculation amount 500 g / m2, watering amount 3L / m2, watering frequency 2 days / times. Artificial cultivation algae and moss crust coverage can reached 70% in 75 days.The optimal combination for the artificial cultivation broadcast seeding moss crust is the high frequency of Watering and nutrient solution, the optimal combination of the artificial cultivation broadcast seeding algal crust is the high frequency of watering + nutrient or high frequency + free nutrient solution. the best combination for spray seeding algal crust field to cultivate is the high frequency of Watering + nutrient solution.(2) The influence of PAM on the artificial cultivation of biocrustssIn the process of artificial cultivation biocrustss, PAM can reduced water evaporation in sandy land surface, thus PAM has a significant role on promoting biocrustss growth at low watering frequency. At high watering frequency, since the soil moisture can meet the needs of biocrustss’ growth, PAM did not play a role in promoting biocrustss growth.(3) Wind Erosion Prevention Mechanism and Benefit of biocrustssAfter cultivating biocrustss on bare sand surface, its anti-erosion effect is significantly enhanced. Compared with bare sand, spray seeding algal crust, broadcast seeding algal crusts and broadcast seeding moss crust,wind erosion decreased by 27.88%, 108.65%, 114.42%, Showed that biocrusts measures can significant improve the ability of the soil resistance to wind erosion, broadcast seeding algal crusts and moss crusts appear sand accumulation phenomenon eventually. broadcast seeding algal crusts and moss crusts increases over time, the crust thickness is gradually increased, a part of the sand will be fixed. Biocrusts combine engineering measures wind erosion control measures showed that broadcast seeding algal crusts and moss crusts + outlet laid gravel erosion prevention works best, spray seeding algal crust erosion prevention effect is not ideal. |
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