论文部分内容阅读
盆栽条件下利用15N示踪技术,研究不同时期施15N-尿素,对沾化冬枣15N的吸收利用及分配特性的影响。结果表明:生长季前期(萌芽前和花前)施用15N-尿素,经根系吸收后,15N优先分配到贮藏器官(包括主干、多年生枝和粗根)中,然后外运用于树体新生器官(包括枣吊及其叶片、新生营养枝、细根及果实)的形成,果实采收后15N开始向贮藏器官回流;果实硬核期15N直接用于树体营养生长和生殖生长,而不是先贮藏再利用;果实速长期15N优先向贮藏器官中积累;萌芽前施15N在树体内的运转规律符合落叶果树贮藏N营养分配规律,优先转运到生长中心。随着施肥期的后延,植株对15N-尿素的当季利用率逐渐下降。
The effects of 15N-urea applied at different periods on the absorption and distribution of 15N in Zhanhua Dongzao were studied by using 15N tracing technique under potted condition. The results showed that 15N urea was applied in the early growing season (pre-emergence and pre-emergence), and 15N was preferentially distributed to the storage organs (including trunk, perennial and coarse roots) after being absorbed by the root system, Including jujube and its leaves, new vegetative shoots, fine roots and fruits), 15N began to flow back to the storage organ after harvesting. The hardwood 15N was directly used for vegetative growth and reproductive growth of trees instead of first storage Re-use; 15N long-term priority to the accumulation of storage organs; pre-sprouting 15N in the tree’s law of operation in line with deciduous fruit tree N storage and distribution of nutrients, preferentially transported to the growth center. With the postponement of fertilization period, plant seasonal utilization of 15N-urea gradually decreased.