间作小麦的边行效应及其与根系空间分布的关系

Relationship between edge effects and root spatial distribution of intercropping wheat

采用隔根试验,研究了间作与单作小麦边行效应的差异及其与根系空间分布的关系.结果表明:单作、不隔根间作、塑料薄膜隔根间作、尼龙网隔根间作小麦边1行产量较边2行分别高13.7%、18.2%、29.0%、33.7%,较边3行分别高22.5%、33.9%、19.4%、29.8%,除塑料布隔根处理外,间作小麦的边行优势明显高于单作小麦.0～100cm土层中的小麦根质量密度在处理间的大小关系为:不隔根间作>尼龙网隔根>塑料布隔根>单作小麦;根系分布深度大小关系为:塑料布隔根>尼龙网隔根>不隔根间作>单作小麦;小麦产量与20～40cm土层中的根质量密度呈显著正相关关系.

A field root separation experiment was carried out in this study to investigate the edge effect of wheat in sole and intercropping systems,and the relationship between edge effect of wheat and the root spatial distribution was also discussed.The results showed that the edge effects at the first side row were 13.7 %,18.2 %,29.0 %,33.7 % higher than the second side row in sole cropping system（W）,wheat corn intercropping system without root separation（W/C）,wheat corn intercropping with root separated by plastic film（（PW/C）,wheat corn intercropping with root separated by nylon（NW/C）,respectively,and the edge effects in the fist side row were 22.5 %,33.9 %,19.4 %,29.8 % higher than the third side row in the four treatments respectively.Except the treatment of PW/C,the edge effect of wheat in intercropping was obvious higher than that in sole cropping.The wheat root weight density in 0-100 cm soil layer among four treatments was W/C〉NW/C〉 PW/C〉 W,and the root distribution depth in soil among four treatments was PW/C〉 NW/〉C W/C〉 W.The yield of wheat was positively correlated to the root weight density in 20-40 cm soil layer.