木薯/大豆不同间作模式对木薯光合生理特性、产量的影响研究

Effect of Different Intercropping Patterns of Cassava/Soybean on Photosynthesis, Physiology and Yield of Cassava

研究木薯与大豆间作模式对木薯光合生理特性和产量的影响,为木薯高产高效栽培提供技术措施。在木薯生长发育过程中的3个不同时期,将木薯与大豆进行不同模式的间作,研究不同间作模式对木薯光合生理特性以及产量的影响。结果表明:与大豆间作,能提高木薯叶片光合作用、叶面积指数(LAI)和鲜薯块根产量,其中处理T4的光合速率(Pn)和气孔导度(Gs)在生长发育的3个不同时期较对照最大增幅分别为11.4%、20.5%,T2的蒸腾速率(Tr)在块根成熟期比对照低19.2%;胞间CO_2浓度(Ci)与光合速率呈负相关;T3的鲜薯产量比对照增加40.3%。综合木薯鲜薯产量、淀粉含量、收获指数等指标,以每2行木薯间作3行大豆为最佳的间作模式。

Cassava was intercropped with soybean in different patterns to observe the effects of cassava intercropping patterns with soybean at the 3 growth stages of cassava on the photosynthesis, physiology and yield of cassava. The results showed that intercropping of cassava with soybean could improve the leaf photosynthesis, leaf area index and fresh root yield of cassava. The cassava intercropping treatment T4 increased the photosynthetic rate （Pn） and stomatal conductance （Gs） of cassava by 11.4% and 20.5% at the 3 growth stages as compared with the CK, and the T2 was 19.2% lower in transpiration rate （Tr） than the CK. The intercellular CO2 concentration （Ci） was negatively correlated with Pn. The fresh root yield of the T3 was 40.3% higher than that of the CK. Considering the fresh root yield, starch content, harvest index and other traits of cassava, the best cassava intercropping pattern was to intercrop 3 rows of soybean between the row of cassava.