T337自根砧富士苹果幼树氮含量与积累量年周期变化

Annual dynamic changes of nitrogen content and accumulation in young Fuji apple tree with T337 rootstock

以3年生T337自根砧富士苹果幼树为试材,年生长周期内定期整株取样,并将整树解析为主根木质部、主根韧皮部、细根、砧木木质部、砧木韧皮部、主干木质部、主干韧皮部、叶片、新梢9部分,分别测定各部位不同时期的生物量和N含量。结果表明,T337自根砧富士苹果幼树各时期各部位N含量为叶片最高,新梢、细根、韧皮部相对较高,而木质部最低。树体各器官干物质和N分配量、分配比率均为营养器官叶片、新梢和细根高于贮藏器官木质部和韧皮部。总干物质与N积累量均为生长后期较高,定植后30~120 d树体干物质积累量占总积累量31.46%,120~180 d树体干物质积累量占68.54%;定植后30~90 d树体N积累量占总积累量37.65%,90~120 d占13.48%,120~180 d占48.87%。

Using young Fuji apple tree with T337 dwarfing rootstock as experimental materials,the whole plants were divided into root xylem,root phloem,fine roots,rootstock xylem,rootstock phloem,scion xylem,scion phloem,leaves,shoots during different growth phrase.The biomass and nitrogen content of all parts were measured.The results showed that the nitrogen contents of leaves were highest in young Fuji apple tree with T337 dwarfing rootstock,second for shoots,fine root and phloem.The nitrogen contents of xylem were lowest.The biomass,N allocation amount and proportion of leaves,shoots and fine root were higher than other parts.With the growth of tree,the biomass and N accumulation amount increased.The biomass accounted for 31.46% of total amount in 30 to 120 days after planting,and that accounted for 68.54% in 120 to 180 days after planting.Nitrogen accumulation accounted for 37.65% of total amount in 30 to 90 days after planting,that account for 13.48% in 90 to 120 days after planting,that account for 48.87% in 120 to 180 days after planting.