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为了解害虫取食胁迫对植物营养元素含量的影响,利用浓硫酸-过氧化氢消煮法,研究了旋心异跗莹叶甲Apophylia flavovirens(Fairmaire)不同密度取食胁迫后丹参Salvia miltiorrhiza Bunge根及地上部N、P、K含量的变化情况。研究结果表明,当受到旋心异跗莹叶甲取食胁迫后,丹参植株主要营养元素N、P、K的含量均有一定变化,随着虫口密度的增加,三种营养元素的含量均成下降趋势:(1)当受到取食胁迫后,对照与虫口密度分别为10、20、30头/株处理后植株地上部N含量分别为2.8040%、2.5400%、1.7560%、1.4920%,根部N含量分别为1.440%、1.3100%、1.260%、1.2040%,其中10头/株、20头/株、30头/株处理与对照地上部N含量差异显著,根部N含量对照与30头/株处理差异显著。(2)当受到取食胁迫后,对照与虫口密度分别为10、20、30头/株处理后植株地上部P含量分别为0.2810%、0.2174%、0.1437%、0.1404%,根部P含量分别为0.1442%、0.1292%、0.096%、0.085%。其中地上部P含量对照、10头/株、20头/株和30头/株处理之间差异极显著;根部P含量10头/株处理与对照之间差异显著,20头/株和30头/株处理与10头/株和对照处理之间差异极显著。(3)当受到取食胁迫后,对照与虫口密度分别为10、20、30头/株处理后植株地上部K含量分别为2.718%、2.6280%、2.2980%、2.2640%,根部K含量分别为1.5900%、1.4400%、1.4800%、1.4420%。其中20头/株和30头/株处理与10头/株和对照之间地上部K含量差异极显著;20头/株和30头/株处理与对照之间根部K含量差异显著。
In order to understand the effect of pest infestation on the nutrient content of plant, Salvia miltiorrhiza Bunge root of Salvia miltiorrhiza Bunge was digested with concentrated sulfuric acid-hydrogen peroxide method under different density of Apophyllum flavovirens (Fairmaire) And above ground N, P, K content changes. The results showed that the contents of N, P and K of main nutrient elements of Salvia miltiorrhiza plant had some changes when they were challenged by X. yichangensis. With the increase of population density, the content of three nutrients (1) When the density of control and insect population was 10, 20, 30 heads / plant, the contents of N in shoots were 2.8040%, 2.5400%, 1.7560% and 1.4920% The content of N in shoots was 1.440%, 1.3100%, 1.260% and 1.2040%, respectively. Among them, the content of N in 10 plants / plant, 20 plants / plant and 30 plants / Significant difference. (2) When the density of the control and the insect population was 10, 20, 30 heads / plant, respectively, the P contents in shoots were 0.2810%, 0.2174%, 0.1437% and 0.1404% 0.1442%, 0.1292%, 0.096%, 0.085%. There were significant differences in the content of P in aerial parts between 10 and 20 plants per plant and 30 plants per plant, There was a significant difference between 10 treatments / strain and control treatment. (3) When the density of control and insect population were 10, 20, 30 heads / plant respectively, the K content in shoots were 2.718%, 2.6280%, 2.2980%, 2.2640% 1.5900%, 1.4400%, 1.4800%, 1.4420%. There were significant differences in the content of K in shoots between 20 treatments and 30 treatments / plant and 10 treatments / control. There was significant difference in K content between 20 treatments / plant and 30 treatments / control.