关键词: 日光温室, CO₂浓度, 日变化, 季节变化, 空间分布, CO₂亏缺

Abstract: Seabuckthorn is regarded as a main eco-economical tree species,and plays an increasing important role in ecoenvironmental construction in Northwest, Northeast and North China.Our study on artificial seabuckthorn forest in loess hilly region showed that the average rainfall interception rate of 7～10 ages seabuckthorn canopy was 8.5%,and the litter layer of 5～10 ages seabuckthorn forest could intercept 0.89 mm rainfall.Seabuckthorn forest could improve soil infiltration and anti-strike ability through improving soil physical and chemical properties,and the numbers of its hair roots and the depth of its litter layer were the main indices of soil anti-strike ability.The effects of seabuckthorn forest on soil and water conservation increased with its increasing age.In 2～3 ages stage,the effects were weak,and the runoff and sediment were mainly affected by the characters of rainfall.In 4～5 ages stage when the forest became maturing,the annual runoff depth and annual erosion modulus were 1.8～3.2 mm and 24.64 t·km^-2,respectively.In 6～12 ages stage when the forest matured,the runoff and sediment on seabuckthorn woodland changed slowly,the annual runoff depth and annual erosion modulus being 0.3～3.4 mm and 0～6.75 t·km^-2,respectively, and the characters of rainfall had much less effect on them.In the stage from young (2～5 ages) to mature forest,the sediment charge in runoff changed sharply,ranged from 77.31 kg·m^-3 to 9.12 kg·m^-3,but in 6～12 ages stage, the sediment content in runoff changed very slowly,and the range was 0～5.09 kg·m^-3.

Key words: Solar greenhouse, CO₂ concentration, Diurnal change, Seasonal change, Spacial distribution