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运用同位素示踪法并结合野外实测对农林复合系统的环境质量调控作用进行了研究,结果表明:农林复合系统中由于林木的存在,其固定CO2能力是单一的农业系统的1.6～2.1倍,农林复合系统大气中CO2浓度平均比单一的农业系统低55～95mL.m-3。杨树与柳树以及小麦和玉米对N2O具有一定的吸收作用。农林复合系统内外,甲烷浓度值十分接近,作物和大气间的CH4气体未表现出明显的交换作用。在沙质土壤类型区,农林复合生态系统是减少降尘的直接原因,能够有效地减少尘埃输送量,同时能减少降尘量达20%～60%;防风效能、乱流交换强度、土壤湿度是决定降尘量大小的主要因子。
Using isotope tracer method combined with field measurements to study the regulation of environmental quality of agroforestry systems, the results showed that the fixed CO2 capacity of agroforestry systems was 1.6-2.1 times that of single agroforestry systems due to the presence of forest trees. The average CO2 concentration in the composite system is 55 to 95 mL.m-3 lower than that of a single agricultural system. Poplar and willow as well as wheat and corn have some absorption of N2O. The concentrations of methane in the agroforestry system are very close both inside and outside the agroforestry system, and CH4 gas between crops and the atmosphere did not show a significant exchange effect. In the sandy soil type area, the agroforestry ecosystem is the direct reason to reduce the dustfall, which can effectively reduce the amount of dust transportation and reduce the dustfall by 20% -60%. The windbreak efficiency, turbulence exchange rate and soil moisture are the determinations Dust amount of the main factor.