A Study on the Relationship of the Shelter-forest Microclimate Effects on Man-made Oasis and Crops Production in Wulanbuhe Sandy Region

Through 4-year study on the oriented spots,the results show that in the experimental network the windbreak efficency is 39%~40% in leafless season and 55.8%~ 56.2% in leaf season ;the temperature decreases by 0.4~0.6℃,especially in July the hottest month, the temperature decreases by 1.2℃ ;the evapo-transpiration rate reduced by 24.3%~ 24.7%, the relative humidity increases by 8%~15%; the days of desiccating hot wind reduced by 58.8%,of them, its light-duty type decreases by 33.3% and heavy-duty type by 87.5%.Under the protection of the network,the output of crops increase by 5.14% and total increase has reached 468 kg/ha and 655.2 yuan/ha.The increasing rate of the output is 50 ~100% comparing with that of the farmland without forest network.