Effects of nitrogen application on photosynthetic characteristics and nutrient absorption of Zanthoxylum bungeanum under different mixed cropping patterns
[Objective]Provide reference for the production practice of Zanthoxylum bungeanum.[Method]Taking 2-year-old Z.bungeanum as the research object,a pot experiment was carried out by using two-factor randomized block design method.Three planting patterns(Z.bungeanum-soybean,Z.bungeanum-capsicum,Z.bungeanum monoculture)and three levels of nitrogen application(0,1.5,2.5 g/plant)were set up.The dry matter mass,photosynthetic indexes and mineral nutrient content of Z.bungeanum under different mixed cropping patterns and nitrogen application levels were determined.[Result]In the three planting patterns,nitrogen application could increase the dry matter mass of Z.bungeanum.Under the nitrogen application level of 1.5 g per plant,the mixed cropping of Z.bungeanum-soybean could improve the dry matter mass of Z.bungeanum.The two mixed cropping patterns could increase the net photosynthetic rate of Z.bungeanum,reduce intercellular CO2 concentration and increase chlorophyll content.Under no nitrogen treatment,the net photosynthetic rate of Z.bungeanum-soybean mixed mode and Z.bungeanum-capsicum mixed mode increased by 70.69%and 59.28%,respectively,compared with that of Z.bungeanum monoculture.The two mixed cropping patterns reduced the intercellular CO2 concentration of Z.bungeanum under the nitrogen application levels of 0 and 1.5 g per plant.Under the three nitrogen application levels,the mixed cropping pattern had no significant effect on the stomatal conductance and transpiration rate of Z.bungeanum.Under the nitrogen application level of 2.5 g per plant,the chlorophyll content of Z.bungeanum-soybean mixed cropping mode and Z.bungeanumr-capsicum mixed cropping mode was 34.39%and 42.81%higher than that of Z.bungeanum monoculture mode,respectively.In the pepper monoculture and pepper-soybean mixed cropping patterns,the nitrogen level had no significant effect on the total nitrogen content of Z.bungeanum.In the Z.bungeanum-capsicum mixed cropping mode,the total nitrogen content of Z.bungeanum at the nitrogen application level of 2.5 g per plant increased by 12.28%compared with that without nitrogen application.In the three planting patterns,there was no significant difference in the total phosphorus content of each nitrogen application level.In monoculture mode,nitrogen application level had no significant effect on total potassium content.In the Z.bungeanum-soybean mixed cropping mode and Z.bungeanum-capsicum mixed cropping mode,nitrogen application significantly reduced the total potassium content of Z.bungeanum.[Conclusion]Mixed cropping and nitrogen application could promote the growth and development of Z.bungeanum,and the effect was the best when Z.bungeanum-soybean mixed cropping and nitrogen application was 1.5 g per plant.
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