桐粮间作林带的配置方式与农作物产量关系的研究

RELATION BETWEEN STRUCTURE OF TREE BELT AND WHEAT YIELD IN Paulownia WHEAT INTEGRATED SYSTEM

以桐粮间作为例，研究了林带的不同配置结构、林带冠覆盖率及小麦产量之间的关系。结果表明，林带距（Ｘｄ）、小麦相对产量（Ｙ）及间作年（Ａ）之间的关系为：Ｙ＝９０．３２９０－１．９９８２Ａ＋１．１９２４Ｘｄ－０．３３４９Ａ２＋０．２９１０ＡＸｄ－０．００３２ＡＸ２ｄ；林带冠覆盖率（Ｘｃ）与小麦相对产量（Ｙ）之间的关系为：Ｙ＝－０．０４０６Ｘ２ｃ＋１．１５３９Ｘｃ＋９８．１７３（Ｘｃ≤２８％），Ｙ＝ｅ（４．７１５１６－０．００５３３９Ｘｃ）（Ｘｃ＞２８％）；当林带冠覆盖率小于２８％时，小麦增产；当林带冠覆盖率大于２８％时，小麦减产，且随间作年的增长而减产趋势越加明显；林带冠覆盖率为１４％时，小麦产量最高；各间作年（Ａ）的最优林带距（Ｘｄ）为：Ｘｄ＝２６．１４９１＋２．６８８６Ａ。

We have studied on structure optimization of Paulownia agricultural integrated system.The results showed that different year(A)of Paulownia wheat intercropping and the relationship between tree belt distance(X d)and wheat yield(Y)was Y =90 3290 1 9982 A +1 1924 X d 0 3349 A 2+0 2910 AX d 0 0032 AX 2 d ;the between tree coverage (X c)and wheat yield was Y =0 0406 XA 2 c +1 1539 X c +98 173(X c≤28%), Y=e (4 71516 0 005339X c) (X c>28%);wheat yield increased when Paulownia coverage was less than 28%;wheat yield was increasingly decreased as tree coverage exceeded 28%;it is evident that under conditions of 14% tree coverage wheat yield could be best promoted.The regression equation of the optimized tree belt distance for each intercropping year is shown as below X d=26 1491+2 6886 A 。