不同隔根方式下间作小麦玉米的竞争力及产量响应  

Yield response to wheat/maize competitiveness in wheat/maize intercropping system under different root partition patterns

作　　者：齐万海[1] 柴强[1] 

机构地区：[1]甘肃农业大学农学院,兰州730070

出　　处：《中国生态农业学报》2010年第1期31-34,共4页Chinese Journal of Eco-Agriculture

基　　金：国家自然科学基金项目(30771264);国家科技支撑计划项目(2007BAD89B17;2007BAD46B06);甘肃省科技创新人才扶持计划资助

摘　　要：通过田间试验研究了尼龙网隔根和塑料薄膜隔根对小麦间作玉米竞争优势的影响,并对间作作物竞争力与复合群体产量间的关系进行了量化分析。结果表明:小麦玉米间作群体中,小麦相对于玉米的竞争力呈先增后降趋势;隔根可降低小麦相对于玉米的竞争优势,未隔根间作处理比塑料膜隔根和尼龙网隔根间作处理的小麦竞争优势分别提高20.5%和4.9%。不隔根、塑料膜隔根和尼龙网隔根小麦间作玉米的土地当量比分别是1.46、1.20和1.39,间作群体的产量与小麦相对于玉米的竞争力呈二次曲线相关关系。适度提高小麦的竞争优势、特别是小麦开花期的竞争优势有利于间作群体整体产量的提高。A field experiment was conducted to investigate the effect of different root partition patterns on wheat/maize competitiveness under intercropping system and how it affects yield.Two root partition patterns （plastic film and nylon mesh partition patterns） were used.The study shows that wheat/maize competitiveness in intercropping system steadily increases from sowing to flowering stage of wheat,and then decreases.Competitive advantage of wheat over maize under intercropping decreases by root partitioning.Intercropping system without root partition increases competitive advantage of wheat by 20.5% and 4.9% respectively,compared to those with plastic film and nylon mesh partition.Land equivalent ratios （LER） of intercropping systems without root partition,with plastic film partition and nylon mesh partition are 1.46,1.20 and 1.39 respectively.Yield for intercropping system is quadratically correlated with wheat competitiveness to maize.Improving wheat/maize competitiveness in intercropping systems could increase yield.The stage of wheat flowering is critical for optimizing wheat competitiveness.

关 键 词：间作 隔根 间作作物竞争力 土地当量比 产量 小麦 玉米 

分 类 号：S344.2[农业科学—作物栽培与耕作技术]