SiO2纳米颗粒对杉木幼苗生长发育的影响

【目的】近年来,硅对于的植物影响受到人们广泛关注,人们试图将硅确定为植物生长发育的的“必要元素”。因此如何提高植物对硅的吸收利用来增加植物的农艺性状和产量,是当前农业和林业研究的一个重要课题。【方法】以黄枝杉Cunninghamia lanceolata和罗田垂枝杉C.lanceolata var.luotian为材料,采用盆栽的方式,研究施加不同浓度的纳米SiO2颗粒(0、1、2、4 g/盆)对杉木幼苗光合参数、叶绿素荧光、叶片厚度、氮磷钾含量及其分配、生物量累积的影响。【结果】本研究结果显示,SiO2纳米颗粒对杉木根系的生长发育有很大的促进作用,使之能更好的吸收养分,加强了氮磷钾含量的累积。且叶片的厚度也有所增加,在较低的浓度下,气孔导度、光合作用机制、以及光合作用效率增加;地上的生物量也随着施入SiO2纳米颗粒浓度的增加而增加。【结论】我们的实验表明,SiO2纳米颗粒通过促进根系发育加强对营养的吸收和提升叶片厚度,以及提高净光合速率和气孔导度来提高植物的生长机理,进而增加植物的生物量来提升产量。鉴于其对植物生长发育及产量的多种积极影响,硅纳米材料将会为农林植物增产有重要的影响和广阔的前景。

Effects of SiO2 nanoparticles on growth and development of Cunninghamia lanceolata(Lamb.)Hook.

【Objective】In recent years,the effects of silicon on plants have been paid more attentions.More attempts have been tried to identify silicon as an“essential element”for the growth and development of plants.Therefore,how to improve the absorption and utilization of silicon for increased agronomic characteristics and yield of plants is an important subject in current agricultural and forestry researches.【Method】The growth of seedlings of Cunninghamia lanceolata(Chinese fir)and C.lanceolata var.luotian)was investigated after treatment of SiO2 nanaparticles of different concentrations(0,1,2,4 g/pot).Some parameters related to growth,such as photosynthetic parameters,chlorophyll fluorescence,leaf thickness,contents of nitrogen,phosphate,and potassium,and biomass.【Result】The results showed that:SiO2 nanoparticles possessed a great promoting effect on the growth and development of Chinese fir root systems,promoting nutrient acquisition and the accumulation of nitrogen,phosphorus and potassium.In addition,the thickness of leaves also increased.Under lower concentrations of SiO2 nanoparticles,stomatal conductivity was enhanced,the photosynthetic mechanism was improved,and the net photosynthetic rates of the two species were promoted.The aboveground biomass also increased with the increase of SiO2 nanoparticle concentrations.【Conclusion】SiO2 nanoparticles can improve plant growth mechanism by increased root development,enhanced nutrient absorption and leaf thickness,as well as net photosynthetic rates and stomatal conductances,so as to increase plant biomass accumulation.In view of its positive effects on plant growth and yield,silicon nanoparticles have important prospects for increasing growth of agricultural and forest plants.