基于APSIM模型的不同耕作措施旱地小麦叶面积指数动态分析

Analysis on Leaf Area Index Dynamics Based on APSIM under Different Tillage Measures in Dryland Wheat

为研究旱地小麦叶片生长规律,利用参数本土化后的APSIM模型模拟传统耕作(T)、传统耕作+秸秆还田(TS)、免耕(NT)、免耕+秸秆覆盖(NTS)、传统耕作+地膜覆盖(TP)和免耕+地膜覆盖(NTP),6种耕作措施下小麦全生育期叶面积指数动态变化过程。在田间试验的基础上,检验APSIM模型,并进行小麦叶面积指数影响分析。结果表明:APSIM模型对不同耕作措施下小麦叶面积指数的模拟有较高精度,各处理模拟值与测算值,相关系数(R)范围在0.988～0.999,均呈显著正相关。小麦全生育期内,其他耕作措施下的平均叶面积指数分别比传统耕作(T)提高了17.9%、8.18%、33.1%、24.7%和52%,NTP处理下叶面积指数提高最为明显。图2,表3,参19。

In order to understand wheat leaf growth in dryland,the parameters of APSIM (agricultural production systen simulator) model were firstly modified and then the dynamical process of leaf area index (LAI) change during wheat growth stage was simulated under different tillage measures,namely,Conventional tillage,Conventional tillage + Stubble retention,No-tillage,No-tillage + straw mulching,Conventional tillage + Plastic film mulching,No-tillage+Plastic film mulching(T,TS,NT,NTS,TP,and NTP). APSIM model was tested according to the data collected from field experiment in Dingxi and the dynamics of LAI on wheat was analysised under different tillage treaments. The results showed that APSIM model can be used to simulate the LAI on wheat under different tillage systems. The predicted and observed LAI were positively correlated (R>0.9) with variation of -15%^+15%. During wheat growth stages,LAI under TS,NT,NTS,TP,and NTP were higher than under conventional tillage and it was obvious that LAI were increased under NTP.