| In this study,field plot experiment was adopted,and Ning Qi 7 was selected as the research object.A completely randomized trial design was adopted to study the effects of different water and fertilizer treatments on growth index,photosynthesis,soil urease activity,soil alkaline phosphatase activity,soil nitrate nitrogen content,yield and quality of Lycium barbarum under bridging-style drip irrigation.The main research conclusions are summarized as follows:(1)The variation rule of plant height of lycium barbarum in each treatment was that it increased gradually with the advancement of growth period.With the development of the growth period,the leaf area of lycium barbarum showed a change rule of first high speed growth,then steady growth,and finally slow growth.The chlorophyll value of lycium barbarum under different treatments increased first and then decreased with the development of growth period.The ground diameter of each treated lycium barbarum showed a steady growth rule with the advancement of growth period.The crown amplitude of each treatment increased gradually with the advance of the growth period.(2)The daily dynamic rule of net photosynthetic rate at each growth stage was that the net photosynthetic rate at fruit-opening and ripe stage was higher than that at flowering and deciduous stage.The daily dynamics of transpiration rate at different growth stages were unimodal type and bimodal type,but the unimodal type was dominant.The transpiration rate at fruit maturity was the highest,followed by deciduous stage,and the lowest at the early flowering stage.The stomatal conductance of L.barbarum under different treatments was double peak type and single peak type.The stomatal conductance of L.barbarum under different treatments was the highest at fruit ripe stage,followed by leaf falling stage and the lowest at flowering stage.(3)Compared with CK,the average soil water content of T4,T5,T6,T7,T8 and T9 in the 0-100cm soil layer increased by more than 10%.In the spring growth stage of Lycium barbarum,the content of nitrate nitrogen in the soil layer of 0-60 cm was relatively high,and the content of nitrate nitrogen in the soil layer of 60-100 cm was relatively low.In the early flowering stage of Lycium barbarum,the content of NO3-N in the 0-60 cm soil layer decreased slightly,and the content of NO3-N in the 60-100 cm soil layer increased.In the fruit stage,soil nitrate nitrogen content increased significantly in each soil layer.In the deciduous stage,the soil nitrate nitrogen content in the 80-100cm soil layer increased,but the soil nitrate nitrogen content in the other growth stages began to decrease.In the spring growth stage of Lycium barbarum,the urease activity was significantly correlated with the soil nitrate nitrogen content in the 4060cm depth range,while in other growth stages,the urease activity was not correlated with the soil nitrate nitrogen content in the 0～60cm depth range.(4)Soil urease activity decreased first and then increased with the growth period.The mean value of urease activity in the soil layer of 0～20cm,20～40cm and 40～60cm was similar in the slightly growing stage of spring.At the early flowering stage,fruit ripening stage and deciduous stage,the mean value of urease activity in the soil layer of 0～20cm was the highest,and the mean value of urease activity in the soil layer of 20-40cm and 40-60cm was similar.The soil alkaline phosphatase decreased first and then increased with the growth period.The mean values of alkaline phosphatase activity in 0-20cm,20-40cm and 40-60cm soil layers were similar.The mean value of alkaline phosphatase activity in the 0-20cm soil layer was the highest in the spring growth stage,the early flowering stage and the deciduous stage,and the mean value of alkaline phosphatase activity in the 20-40cm and 40-60cm soil layer was similar.(5)The yield of Lycium barbarum increased first and then decreased with the advance of testing time.The total yield of Lycium barbarum under T6 treatment was the highest,which was 10823.19kg/hm2.Under the condition of a certain amount of irrigation water,the content of betaine and flavonoids in Lycium barbarum increased with the increase of fertilizer application.Under the condition of a certain amount of fertilizer application,the content of betaine and crude lipid of Lycium barbarum increased with the increase of irrigation amount.In general,all the quality indexes of Lycium barbarum treated by T7 were the best.According to the comprehensive evaluation value of the quality of different water and fertilizer treatments and the ranking of scores,the results showed that T7 had the most effective effect on improving the quality of Lycium barbarum.The effects of different irrigation and fertilization treatments on growth,photosynthesis,soil enzyme activity,yield and quality of Lycium barbarum were comprehensively analyzed.The optimal water and fertilizer management scheme was T6 treatment(irrigation amount of 242.46m3/667m2,application amount of N-P2O5-K2O:14-5-9kg/667m2). |
