管道工程施工扰动对玉米种植的影响

Effects of Pipeline Construction on Cropland Productivity

管道工程建设是高强度干扰生态系统的过程,而现有研究很少关注管道建设对作物生长的影响。针对西气东输二线工程,选择3个典型农田保护区,通过布设样带和样点,监测作物产量和生长性状,评估天然气管道建设对农田生产力的影响。结果表明,管道建设对农田生产力的影响主要发生在施工作业带上方,干扰强度表现为管沟>作业区>堆土区,管道外50 m基本不受施工影响。线性回归表明,玉米穗期叶面积指数与产量之间有显著的相关性,可用来模拟作物产量。管道穿越农田生态系统需要做好环境保护措施,控制施工范围,严格执行土层分层开挖、分层回填,坚决杜绝生土回填到耕作层,施工后及时恢复农田生产力。

Gas pipeline construction has extensively disturbed the ecosystem. However,there were few researches focused on the effect of pipeline projects on farmland productivity. In this study,we assessed the disturbance of West-to-East gas transmission pipeline on crop yield.Transects and sample points were laid out in three study areas for crop yield and characteristics measurement. The results showed that the disturbance was mainly in the pipeline construction site,and the disturbance levels were as trench〉 working area 〉piling zone. There was almost no disturbance 50 m outside the pipeline. Leaf area index（ LAI） of panicle stage showed significant correlation with crop yield in the linear regression analysis. It is important to take removed topsoil separately from subsurface soil,and limit the construction scope in the pipeline construction site. The environmental management in pipeline construction is efficient for farmland productivity restoration.