论文部分内容阅读
以单作小麦系统(CK)为对照,试验研究中国黄淮海平原农区杨树—小麦(简称“复合系统”)对作物冠层CO2含量的影响作用,旨在为进一步补充与完善农林复合系统生态效应内容,以期能为农区发展农林复合系统提供一定的理论依据。结果表明:小麦拔节~乳熟期间,间作系统内小麦冠层上方0.5m处晴天白天CO_2含量比CK约低7.53%,这种差异程度随日期的延续呈逐渐增大趋势,拔节期时仅为4.47%,到扬花期和乳熟期时,分别增至7.48%、11.87%。白天日内各时刻间作系统CO2含量均低于CK,且中午前后的差异程度高于早、晚时刻,但日变化规律二者间基本一致。作物冠层附近的CO_2含量随距林带距离的变化呈W型分布趋势,即靠近林带处CO_2含量要高于间作系统中心处。
The effect of poplar-wheat (“composite system”) on crop canopy CO2 content in farmland of Huang-Huai-Hai Plain in China was compared with single-cropping wheat system (CK) to study the effect of agroforestry system Ecological content, with a view to provide a theoretical basis for the development of agroforestry systems in rural areas. The results showed that during the jointing stage and the milking stage, the content of CO_2 in sunny day at the position of 0.5m above the wheat canopy in the intercropping system was lower than CK by 7.53%, which increased gradually with the extension of the date. 4.47%, to flowering and milky maturity, respectively, increased to 7.48%, 11.87%. The contents of CO2 in the system were lower than CK during the daytime and daytime, and the differences between before and after noon were higher than those at the early and late days, but the daily variation was basically the same. The CO 2 content near the crop canopy showed a W-shaped distribution trend with the distance from the forest belt, ie, the CO 2 content near the forest belt was higher than that of the intercropping system.