Simulation of crop growth curve and analysis of interspecific interaction in wheat and faba bean intercropping system
Simulation of crop growth curve and analysis of interspecific interaction in wheat and faba bean intercropping system
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DOI：
10.13287/j.1001-9332.201812.026
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发表时间：
2018-12-01
期刊：
影响因子：
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通讯作者：
Xiao Jing-xiu
中科院分区：
文献类型：
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作者：
Bai Wen-lian;Zhang Meng-yao;Xiao Jing-xiu
种间相互作用与间作产量优势密切相关。但对种间相互作用的动态变化研究较少。以小麦、蚕豆为材料，研究了不同种植模式（小麦单作、蚕豆单作、小麦蚕豆间作）和施磷水平[P-0，0 kg P2 O 5. 0，hm（-2）（对照）; P-1，45 kg P2 O 5. hm（-2）; P-2，90 kg P2O5 . hm ~（-2），重复次数]，采用Logistic回归分析。分析了种间相互作用的动态。结果表明，小麦间作蚕豆比单作小麦增产10.5%~ 18.6%。间作蚕豆比单作蚕豆减产4.8%~ 12.3%。小麦蚕豆间作仍表现出产量优势，其土地当量比（LER）和相对拥挤系数（K）分别为1.01-1.15和1.12-3.20。小麦和蚕豆的产量和主要生长参数均受磷水平的调节，但LER和K不受磷水平的影响。小麦与蚕豆间作时，小麦的最大生长速率（Rmax）和初始生长速率（r）分别比小麦间作时提高21.8%~ 38.7%和20.8%~ 38.9%。种植方式对蚕豆的主要生长参数没有影响。在生育前期，不同施磷水平下单作和间作作物的生长曲线没有差异。小麦蚕豆间作系统在生育前期以种间竞争为主，不存在间作生物量优势（LER 1）。总之，小麦与蚕豆的互作因生育期不同而异。小麦蚕豆间作对小麦生育中后期的生长速率有一定的促进作用，这是间作优势的基础。
Interspecific interactions are closely related to the intercropping yield advantage. Little attention was paid to the dynamic changes of interspecific interactions. In this study, the growth curves of wheat and faba bean under different planting patterns (wheat monocropped, faba bean monocropped, and wheat and faba bean intercropping) and phosphorus (P) fertilization levels [P-0, 0 kg P2O5 . hm(-2)(the control); P-1, 45 kg P2O5 . hm(-2); P-2, 90 kg P2O5 . hm(-2), repetitively] were simulated by Logistic analysis in a two-year field experiment. The dynamics of interspecific interaction were analyzed. The results showed that wheat yield was increased by 10.5%-18.6% when wheat was intercropped with faba bean as compared to monocropped wheat (MW). The yield of intercropping faba bean (IF) was decreased by 4.8%-12.3% relative to monocropped faba bean (MF). However, wheat and faba bean intercropping still showed yield advantage, with the values of land equivalent ratio (LER) and relative crowding coefficient (K) being 1.01-1.15 and 1.12-3.20, respectively. Both the yields and key growth parameters for wheat and faba bean were regulated by P level, but LER and K were not affected by P level. The maximum growth rate (R-max) and the initial growth rate (r) of wheat were increased by 21.8%-38.7% and 20.8%-38.9% when wheat was intercropped with faba bean as compared to corresponding MW, respectively. The planting pattern had no effect on the key growth parameters of faba bean. No difference in growth curve between monocropping and intercropping crop was found under different P fertilization levels during the early growth stages. The interspecific competition was dominant in wheat and faba bean intercropping system during the early growth stages, without any intercroping biomass advantage (LER1). In conclusion, the interaction between wheat and faba bean varied with growth stages. Wheat and faba bean intercropping stimulated the growth rate of wheat during the middle and late growth stages, which was a foundation for intercropping advantage.