基于氢氧稳定同位素的矮砧苹果树根系吸水深度研究

Water Absorption of Roots of Dwarf Anvil Apple Trees Based on Stable Isotopes of Hydrogen and Oxygen

为了研究矮砧苹果树根系吸水深度,利用氢氧稳定同位素技术,测定了7年生矮砧苹果树在萌芽花期、新梢旺长期和果实膨大期不同深度土壤水的稳定同位素值,并应用IsoSource多元线性模型分析水源的水分贡献率。结果表明:矮砧苹果树在萌芽花期主要利用0~20 cm(59.5%)处的土壤水;在新梢旺长期6月主要吸水深度为0~20 cm(42.9%)和20~40 cm(11.1%);新梢旺长期7月根系的主要吸水深度为0~20 cm(24.3%)和20~40 cm(29.1%);果实膨大期8月为0~20 cm(23.6%)、20~40 cm(37.1%)和40~60 cm(11.6%);果实膨大期9月为0~20 cm(26.3%)、20~40 cm(27.3%)和40~60 cm(13.8%)。

In order to study the water absorption depth of roots of dwarf anvil apple trees, the stable isotope values of soil water at different depths of 7 years old dwarf anvil apple trees during the period of germination and flowering, the period of new shoots and the period of fruit expansion were determined by using the hydrogen-oxygen stable isotope technology, and the water contribution rate of water source was analyzed by using the IsoSource multiple linear model. The results showed that the soil water at 0~20 cm (59.5%) was mainly used in dwarf apple trees. In June of new shoot flourishing period, the main water absorption depth was 0~20 cm (42.9%) and 20~40 cm (11.1%). The main water absorption depth of root system in July of new shoot flourishing period was 0~20 cm (24.3%) and 20~40 cm (29.1%). It was 0~20 cm (23.6%), 20~40 cm (37.1%) and 40~60 cm (11.6%) in August of fruits bulking stage. And it was 0~20 cm (26.3%), 20~40 cm (27.3%) and 40~60 cm (13.8%) in September of fruits bulking stage.