| 其他摘要 | 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 slash
Artificial sow cultivation biocrust is feasible in the region that precipitation is
about 400mm. The optimum measures are: inoculation amount 500g / m 2 , watering
amount 3L / m 2 , 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 biocrustss
In 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 biocrustss
After 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.
Keywords: photovoltaic power plant; biocrusts; artificial cultivation; PAM; wind
erosion control |
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