DA-6对双H型立体栽培草莓光合作用和生长发育的影响
Effect of DA-6 on strawberry photosynthesis and growth in the double-H three-dimensional culture system

针对立体栽培各层草莓生长状况不一致的现状,为促进DA-6在草莓立体栽培中的应用,以日光温室双H型立体栽培的'红颜'草莓为试材,测定分析双H型立体栽培架上下层的光环境,分析冬季叶面喷施DA-6对双H型立体栽培上下层草莓光合作用、植株生长、果实产量和品质的影响。结果表明,双H型立体栽培的草莓下层光环境较差,下层南部、中部和北部光环境差异较大。随着DA-6浓度的提高,DA-6处理双H型立体栽培草莓能够提高净光合速率、促进植株生长、增加草莓产量、改善果实品质,DA-6对上下层草莓光合作用及生长发育的影响不同。20 mg/L DA-6处理双H型立体栽培上层草莓,净光合速率比对照提高了13.0%,叶面积提高了18.0%,显著提高了叶绿素a、b含量、果实产量、果实硬度和可溶性固形物;30 mg/L DA-6处理双H型立体栽培下层草莓,净光合速率比对照提高了53.0%,叶面积提高了11.1%,显著提高了叶绿素a、b含量、果实产量、果实硬度和可滴定酸含量,降低了可溶性固形物含量;40 mg/L DA-6处理则产生了抑制作用,表明对于光环境相对较差的双H立体栽培下层草莓,适度喷施DA-6有利于促进草莓的光合作用、产量增加和提早成熟。
In view of present situation that the growth of strawberry in different stereo cultivation layers is not the same and to promote the application of DA-6 in stereo cultivation,'Benihoppe' strawberry (Fragaria×ananassa Duch.) in the double-H three-dimensional of protected cultivation was used to explore the light conditions of culture system and the effect of spraying DA-6 in winter on strawberry photosynthesis,plant growth,yield and quality of fruit.The results revealed that the light conditions of lower layer of double H-dimensional cultivation was poor and the light environment of southern,central and northern part of lower layer was quite different and DA-6 improved the net photosynthetic rate,promoted plant growth,increased strawberry production and improved fruit quality with the increase of DA-6 concentration.Compared with the control,the net photosynthetic rate of upper strawberry with 20 mg/L DA-6 treatment was increased by 13.0% and LAI improved 18.0% and significantly increased chlorophyll a,b content,fruit yield,fruit firmness and soluble solids;the net photosynthetic rate of lower layer strawberry with 30 mg/L DA-6 was increased by 53.0% and LAI improved 11.1%,resulting in significant increase of chlorophyll a,b content,fruit yield,fruit firmness and titratable acidity and decrease of soluble solids content;however,the growth of strawberry with 40 mg/L DA-6 treatment was inhibited.Our study demonstrated that moderate spraying DA-6 can promote photosynthesis of strawberry and its early maturity,increase the productivity of dual H-dimensional cultivation of strawberries under relatively poor light environment in lower layer in.