应用41Ca-AMS技术开展肥城桃钙示踪研究.

The calcium deficiency has caused many problems such as browning， poor storability for Feicheng peach，which is great economic losses for Chinese farmers. It is very significant to research the transport rule of calcium in fruit trees. In order the absorption, translocation and distribution of calcium in peach, a technique of 41Ca isotope tracer combined with AMS was developed and applied in the study. A field experiment was conducted to determine effects of injecting calcium fertilizer on tracer calcium content dynamic, calcium distribution of Feicheng peach to understand the rules of absorbing calcium and provides the theoretical basis in adding calcium nutrient and technical guidance. The experimental material is 11 years old Feicheng peach tree. Ca(N03)2 solution (including 41Ca) was injected on selected Feicheng peach fruit flees at 2015.04.30 at the florescence. Then, about every 30 days, the peach trees different organs, such as new shoots, leaves, perennial branches, were collected. All the samples were prepared to CaF) and measured at HI-13 AMS at CIAE. The main results are follows： (1) More than 60% of 41Ca were stored in the trunk and the 41Ca distribution gradually decreased from bottom to top in trunk. (2) In young fruit stage, the calcium was mainly absorbed by organs such as leaves, branches, flesh mainly concentrated, however, from the fruit swelling period to the mature stage, calcium content in the leaves and flesh was declining, and the calcium content in the perennial branches had the same tendency at the beginning but it grew in the mature stage. (3) In mature stage, from August 4 to September 2 the distribution of 41Ca of each organ showed that the organs. calcium content was higher whose transpiration was greater and the calcium contents of new organs were as follows： new shoot>pericarp>flesh. It is feasible and easy to explore the peach tree for calcium absorption and distribution by using 41Ca-AMS technology. And the rapidly calcium growing period of new shoots and leaves is at the florescence for trunk injection application of calcium. The best calcium absorption time was studied in order to provide a guidance. While there are some shortages in this experiment, such as the datum of root, new leaves for the limitation of targets in source were not got. In the future, a new and special facility to measure the built, so that more detailed study about the running rule of calcium ion in peach trees can be improved. [ABSTRACT FROM AUTHOR]