枝条死亡对西天山野生苹果叶片营养状况和化学计量的影响

IF 0.4 4区 环境科学与生态学 Q4 ECOLOGY
Y. Tao, Maziyirea Nuerhailati, Yuanming Zhang, Jing Zhang, B. Yin, Xiaobing Zhou
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引用次数: 5

摘要

摘要:野生苹果树Malus sieversii是一个第三纪遗迹种,也是当今常见栽培苹果树的重要祖先。近年来,许多西氏分枝杆菌个体已经死亡或分支严重死亡。分枝死亡是否会导致西氏分枝杆菌营养化学计量的变化尚不清楚。在本研究中,系统分析了具有不同枯枝比例的西花楸单株在年生长期的氮(N)、磷(P)和钾(K)化学计量性状、元素比例关系以及可能的影响因素。生长季节叶片氮、磷、钾含量均呈下降趋势,三类间氮、磷含量差异不显著;而Ⅲ类野生苹果树的光合器官和生殖器官的钾含量最低。花的磷和钾含量高于叶,而果实的氮含量较低。由于氮磷比和氮吸收效率低,西氏分枝杆菌的生长总是受到氮的限制。三个类别的叶片N–P、N–K或P–K的比例指数没有显示出任何显著差异,揭示了M.sieversii的一个固有特性。大多数土壤变量与叶片养分参数的相关性较弱(K除外)。降水量和相对湿度,而不是温度,对叶片养分有显著的正向影响。这些发现表明,增加水分输入和植物钾含量可能有助于提高野生病苹果树的抗性和恢复能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of Branch Death on Leaf Nutrient Status and Stoichiometry of Wild Apple Trees (Malus sieversii) in the Western Tianshan Mountains, China
ABSTRACT The wild apple tree Malus sieversii is a tertiary relict species and a key ancestor of the commonly cultivated apple trees today. In recent years, many M. sieversii individuals have died or have severe dead branches. Whether branch death would lead to the change in nutrient stoichiometry of M. sieversii remains unclear. In this study, the nitrogen (N), phosphorous (P), and potassium (K) stoichiometric traits of M. sieversii individual trees with different proportion of dead branches divided into three classes (Class I [< 20%], Class II [40–60%], and Class III [> 80%]) during annual growth period, elemental scaling relations, and the possible influencing factors were systematically analysed. Leaf N, P, and K decreased during growing season, and N and P did not show significant differences among the three classes; however, the Class III wild apple trees had the lowest K contents in both photosynthetic and reproductive organs. Flowers had higher P and K contents than leaves, whereas fruits had low N content. The growth of M. sieversii was always limited by N due to low N:P ratio and N resorption efficiency. The scaling exponents of leaf N–P, N–K, or P–K among the three classes did not show any significant differences, revealing an inherent property of M. sieversii. Most soil variables showed weak correlations with leaf nutrient parameters (except for K). Precipitation and relative humidity, rather than temperature, showed significantly positive effects on leaf nutrients. These findings suggest that increasing water input and plant K content may be conducive to enhance the resistance and recovery ability of diseased wild apple trees.
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来源期刊
Polish Journal of Ecology
Polish Journal of Ecology 环境科学-生态学
CiteScore
1.10
自引率
0.00%
发文量
9
审稿时长
18-36 weeks
期刊介绍: POLISH JOURNAL OF ECOLOGY (formerly Ekologia polska) publishes original scientific research papers dealing with all aspects of ecology: both fundamental and applied, physiological ecology, evolutionary ecology, ecology of population, community, ecosystem, landscape as well as global ecology. There is no bias regarding taxons, ecosystems or geographical regions.
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