农桐复合系统林带结构优化模式的研究

Structure optimization of Paulownia belt in Paulownia crop integrated system.

以麦桐复合经营为例，研究了林带的不同配置结构、林带覆盖率与小麦产量之间的关系，并通过一系列数学方法实现了林带结构的优化．结果表明，在一个轮伐期内，泡桐林带覆盖率累计均值为１０．１％～１０．９％时，小麦相对产量累计均值最大（１０５．４），为最优林带覆盖率累计均值．最优林带距（Ｄ）与轮伐期（Ｔ）之间的关系为：Ｄ＝０．６００＋１１．０４２Ｔ－０．７８７Ｔ２＋０．０２７３Ｔ３（Ｒ２＝９９．９％）．

In this article, a Paulownia wheat intercropping system was used as an example to study the relationships of wheat yield with shelterbelt structure and its coverage. The optimized structure of Paulownia belt was formulated through a series of mathematical models. The results show that during one rotation of Paulownia , the average of relative accumulative wheat yield reached the highest (105.4) when the average of accumulative shelterbelt coverage was 10.1～ 10.9 % which is the best one. The regression equation of the optimized distance ( D ) and Paulownia rotation period ( T ) is showed as follows: D=0.600+11.042T-0.787T 2+0.0273T 3(R 2=99.9%) .