关键词：
纳米铁;椰林间作;鹧鸪茶;光合作用;生长
摘 要：
林下间作鹧鸪茶可破解用地瓶颈制约,应用绿色纳米技术提高其复合种植成效具有重要意义.为明确纳米铁在椰林间作鹧鸪茶中的调控作用,以鹧鸪茶一年生苗为研究对象,开展林下栽培试验,探讨 5 个浓度的纳米铁处理(CK:0 mg/L,T1:25 mg/L,T2:50 mg/L,T3:75 mg/L,T4:100 mg/L)对鹧鸪茶叶生长、光合及化学特征的综合影响.结果表明:第一次纳米铁处理后,仅 T3 处理的鹧鸪茶叶长、叶宽和叶干重显著高于 CK,但所有处理叶片数均显著多于CK.4 个浓度纳米铁处理的鹧鸪茶叶绿素含量与CK相比显著增加 14.96%(T1)、16.18%(T2)、17.91%(T3)、20.58%(T4).随纳米铁浓度提高,鹧鸪茶叶片净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)、PSⅡ原初光能转化效率(Fv/Fm)、实际光化学效率(ΦPSⅡ)和表观电子传递速率(ETR)均呈增加趋势.第二次纳米铁处理后,T1、T3、T4 处理的鹧鸪茶叶长、叶宽、叶干重、叶片数均显著高于 CK.各处理的鹧鸪茶叶绿素含量相比 CK 显著提升 10.28%(T1)、7.53%(T2)、11.13%(T3)、11.41%(T4).随纳米铁浓度提高,鹧鸪茶叶片Pn、Tr和Gs显著增加,但浓度达到T3 时,以上3 项指标显著降低.鹧鸪茶叶片 PSⅡ潜在活性(Fv/Fo)和Fv/Fm也在 T3 处理中显著降低.2 次处理后,与CK相比,鹧鸪茶叶片黄酮、脂肪和灰分含量在T1 处理中显著增加,其脂肪和灰分含量随纳米铁浓度提高有所下降.因此,纳米铁对林下鹧鸪茶生长具有积极调控作用,但浓度过高会抑制其光合生长,使用浓度在 25~50 mg/L为宜,本研究可为椰林间作鹧鸪茶中纳米铁的应用提供理论参考.
译 名：
Combined Effects of Nano-iron on Leaf Growth,Photosynthetic and Chemical Characteristics of Mallotus peltatus under Coconut Forest
关键词：
nano-iron%coconut intercropping%Mallotus peltatus%photosynthesis%growth
摘 要：
The intercropping of Mallotus peltatus under the forest helps to break the bottleneck of land use.It is of great significance to apply green nanotechnology to improve the benefits of its compound planting.In order to clarify the regulatory role of nano-iron in the intercropping of M.peltatus under the coconut forest,the annual seedling of M.pel-tatus was taken as the research object to carry out the cultivation experiment.We investigated the comprehensive effects of five concentrations of nano-iron treatments(CK:0 mg/L,T1:25 mg/L,T2:50 mg/L,T3:75 mg/L,T4:100 mg/L)on the leaf growth,photosynthetic and chemical characteristics of M.peltatus.After the first nano-iron treatment,the leaf length,width and dry weight of M.peltatus in T3 treatment were significantly higher than those in CK,while the leaf number in each treatment was significantly more than that in CK.Compared with CK,the chlorophyll content of M.peltatus treated with four nano-iron concentrations increased significantly by 14.96%(T1),16.18%(T2),17.91%(T3)and 20.58%(T4).As the concentration of nano-iron increased,the leaf net photosynthetic rate,transpiration rate,stomatal conductance,efficiency of primary conversion of light energy of PSⅡ,actual photochemical efficiency of PSⅡ and electron transport rate of M.peltatus overall increased.After the second nano-iron treatment,leaf length,width,dry weight and number of M.peltatus treated with T1,T3 and T4 were significantly higher than those of CK.Compared with CK,the chlorophyll content of M.peltatus in each treatment significantly increased by 10.28%(T1),7.53%(T2),11.13%(T3)and 11.41%(T4).With the increase of nano-iron concentration,the leaf net photosynthetic rate,transpira-tion rate and stomatal conductance of M.peltatus increased significantly,but decreased when the concentration reached T3 treatment.The potential activity of PSⅡ and efficiency of primary conversion of light energy of PSⅡ of M.pel-tatus also decreased significantly in T3 treatment.After two treatments,the contents of flavone,fat and ash of M.peltatus increased significantly in T1 treatment compared with CK.The contents of fat and ash decreased with the increase of nano-iron concentration.To sum up,nano-iron has a positive regulatory effect on the growth of M.peltatus under the coconut forest,but high concentration will inhibit its photosynthesis and growth.We recommend that the appropriate concentration is 25?50 mg/L.This study could provide theoretical reference for the application of nano-iron in intercropping M.peltatus under the coconut forest.
