两种枣树矿质营养元素累积特性研究

为探明枣树矿质营养元素的累积分配特征，以3年生骏枣树和灰枣树为试材，采用彻底刨根、分解取样的方法，研究了生物量的构成特点、各器官矿质元素含量和累积分配特性。结果表明，骏枣树总干质量为2694.3 g/plant，其中营养器官占68.0%，分别比灰枣高27.6%和21.9%。其N、P、K、Ca、Mg总累积量为33.91、3.43、22.20、31.25和5.53 g/plant，分别比灰枣树高50.1%、22.5%、24.7%、51.0%和88.7%。其中，N主要分配到叶片和果实，P、K主要分配到果实和叶片，Ca、Mg主要分配到叶片和主干；新生营养器官N、P、K的吸收比例为1: 0.063～0.083: 0.41～0.46，果实N、P、K的吸收比例为1: 0.19～0.20: 1.34～1.48。每生产1000 kg干质量骏枣需吸收N 32.83、P 3.41、K 23.14、Ca 29.06、Mg 5.32 kg；灰枣需吸收N 20.53、P 2.66、K 17.71、Ca 18.01、Mg 2.49 kg。骏枣生产单位干质量果实需吸收的养分比灰枣多，养分利用效率比灰枣低。骏枣树养分在叶片中的分配率显著高于灰枣树，在果实中的分配率则显著低于灰枣树。

Accumulation properties of mineral elements in two types of Chinese jujube

The aim of this study was to investigate the properties of accumulation and distribution of mineral elements in Chinese jujube(Ziziphus jujube Mill.) and to establish a reasonable fertilization protocol.Field experiments were conducted to analyze the composition of the characteristics of biomass,mineral elements content and its accumulation in different parts of Junzao jujube and Huizao jujube trees that were about 3 years old.The total dry biomass of Junzao jujube was 2694.3 g/plant of which the vegetative...