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桑园套作是提高蚕桑生产效益的途径之一。为了对桑树与红薯套作桑园进行合理的栽培管理,在自然条件下测定分析单作、套作模式桑树与红薯叶片的气体交换参数以及净光合速率(P n)对光和CO2的响应特性。结果表明,单作模式的桑树或红薯均有明显的光合“午休”现象,而套作模式的桑树与红薯则无光抑制现象;套作模式的桑树与红薯的表观量子效率(AQY)和羧化效率(CE)大于单作模式,单作模式的桑树或红薯的P n、气孔导度(G s)、胞间CO2浓度(C i)、蒸腾速率(T r)、表观光能利用效率(LUE)季节变化均值显著大于套作模式(P<0.05);影响2种套作植物的P n最主要的环境因子是光合有效辐射(PAR),同时G s和T r都受空气相对湿度的影响。综合上述试验结果认为,桑树与红薯套作可提高群体的表观量子效率和羧化效率及对水分的利用效率,但降低了表观光能利用效率和CO2利用效率,所以需要优化套作模式下桑树的冠层结构及桑园套作红薯的配置比例,最终使桑树、红薯丰产,达到使桑园产值最大化的目的。
Mulberry set is one of the ways to improve the production efficiency of sericulture. In order to rationally cultivate and manage mulberry and sweet potato sets for mulberry, the gas exchange parameters of mulberry and sweet potato leaves under monoculture and intercropping and the responses of net photosynthetic rate (P n) to light and CO2 were analyzed under natural conditions . The results showed that both mulberry and sweet potato had obvious photosynthesis “lunch break ” phenomenon in single cropping and mulberry and sweet potato in cropping pattern showed no photosynthetic inhibition. The apparent quantum yield of mulberry and sweet potato (AQY ) And carboxylation efficiency (CE) were higher than those of monoculture and monoculture, respectively. P n, stomatal conductance (G s), intercellular CO2 concentration (C i), transpiration rate The mean seasonal variation of energy use efficiency (LUE) was significantly greater than that of the intercropping model (P <0.05). The most important environmental factor affecting the P n of the two plantations was photosynthetically active radiation (PAR), and both G s and Tr Impact of air relative humidity. Based on the above experimental results, it is concluded that the mulberry and sweet potato intercropping can improve the apparent quantum yield and carboxylation efficiency and water use efficiency, but reduce the apparent light energy utilization efficiency and CO2 utilization efficiency. Therefore, The canopy structure of mulberry and the proportion of sweet potato in the mulberry field make the yield of mulberry and sweet potato high, finally achieving the goal of maximizing the output of mulberry.