摘要
初步研究认为,农林复合系统(以下简称"系统")同单一的农业系统相比,作物层附近白天 CO_2浓度略有减少,这种差异主要出现在10～13时。在"系统"内,由于农林结构与配置不同,CO_2浓度在空间分布上也不均匀,无论"系统"内或外,CO_2垂直通量白天多表现为向下,早、晚则相反。从平均情况看,"系统"内 CO_2通量稍大于旷野农田。尽管"系统"内有上述 CO_2浓度的变化,但"系统"内作物光合强度仍高于旷野农田。
This study considered that compared the comosite system of agriculture and forestry(the following abridged as system)with the single agricultural system,the concentration of carbon dioxide near the crop layer during the day slightly reduced.This difference appeared between 10～13 o'clock Beijing time.Within this system,due to the structure and arrangement of agriculture and forestry,the concentra- tion of carbon dioxied was not even on the space distribution.Regardless of the inside or outside of the sys- tem,the vertical flux of carbon dioxide appeared mostly toward the low during the day,but on the contrary during the early morning and evening.From the average condition,the carbon dioxde flux within the sys- tem was slightly bigger than that in the open wide field although there was the change of the above—men- tioned carbon dioxide concentration,the crop photosynthesis strength within the system was still higher than that in the open wide field.
基金
国家自然科学基金项目
关键词
农林复合系统
CO2
农田
光合作用
composite system of agriculture and forestry
carbon dioxide concentration
vertical flux of carbon dioxide
