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以我国北方半干旱区典型自然条件为模型输入参数,对生物量和风蚀量的动态变化和空间分布进行了模拟。模拟的主要影响因素有降水量、气温、土壤类型和风况等。模拟结果表明:生物量随着降水量的增加和气温的升高而增大,风蚀量随着大风日数和风速的增加而增大。随着半干旱区降水和气温的季节变化,生物量在初春最低、夏末最高;风蚀量则在春季最大、夏季最小。生物量和风蚀量有明显的相互影响,生物量的增加能够有效降低风蚀量。在不受其他因素影响时,生物量与降水量在空间上的分布呈现出一致性,在考虑气温因素后生物量的重心向气温较高处偏移。小幅度的地形变化对生物总量和风蚀总量的大小影响不大,但明显改变了它们的空间分布格局。
Taking the typical natural conditions of the semiarid regions in northern China as input parameters, dynamic changes and spatial distribution of biomass and wind erosion were simulated. The main influencing factors of simulation are precipitation, temperature, soil type and wind condition. The simulation results show that the biomass increases with the increase of precipitation and temperature, and the amount of wind erosion increases with the increase of windy days and wind speed. With the seasonal variation of precipitation and temperature in semi-arid area, the biomass was the lowest in early spring and the highest in late summer. The amount of wind erosion was the highest in spring and the lowest in summer. The biomass and the amount of wind erosion have a significant interaction, and the increase of biomass can effectively reduce the amount of wind erosion. Without being affected by other factors, the spatial distribution of biomass and precipitation is consistent. After taking into account the temperature, the center of gravity of the biomass shifts to a higher temperature. Small changes in the terrain had little effect on the total amount of biomass and the total amount of wind erosion, but significantly changed their spatial distribution pattern.