民勤荒漠区4种主要灌木植物叶片C、N、P化学计量特征的季节变化
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(31700339)、国家地区(31760238、31860116)、国家面上基金项目(41671528)、甘肃省荒漠化与风沙灾害防治国家重点实验室资助。


Seasonal variations of C,N and P stoichiometry characteristics in leaves of four shrubs in Minqin arid desert area
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    摘要:

    为探究不同灌木植物叶片C、N、P化学计量特征季节变化规律,揭示荒漠植物对环境的适应策略,以民勤荒漠区4种主要灌木植物(梭梭、沙拐枣、唐古特白刺、柠条锦鸡儿)为研究对象,分析不同荒漠植物在生长季内叶片的 C、N、P含量及其计量比特征。结果表明:(1)4种荒漠植物叶片C、N、P及C:N、C:P和N:P在生长季内的变化规律不同, 且以上各指标季节间的变异系数在4种植物之间也存在差异。(2)沙拐枣、柠条锦鸡儿叶片C含量显著(p<0.05)高于唐古特白刺、梭梭,唐古特白刺显著(p<0.05)高于梭梭,沙拐枣与柠条锦鸡儿差异不显著;唐古特白刺叶片N含量显著(p<0.05)高于其他3种植物叶片;4种植物叶片P含量差异不显著(p>0.05)。(3)4种荒漠植物叶片C、N、P及其计量比各指标在生长季节内的变异系数由大到小排序为:P (28.34%) > C:P (24.70%) > N:P (19.07%) > N (17.49%) > C:N (16.89%) > C (2.91%)。(4)植物叶片C、N、C:N、C:P和N:P含量的变异主要受植物种类影响,植物叶片P含量的变异主要受生长季节影响。

    Abstract:

    To illustrate seasonal variation rule of C, N and P stoichiometric characteristics of different shrub plant leaves, understand the plants adapt to the environment strategy, four main shrub in Minqin arid desert area (Haloxylon ammodendron, Calligonum arborescens , Nitraria tangutorumS, Caragana korshinskii Kom.) as the research object, and in the growing season C, N, P content and its measurement ratio were analyzed. The results show that:(1) the leaf C, N, P and C:N, C:P and N:P of the four desert plants had different changing rules in the whole growing season, and the variation coefficients of the above indexes between seasons were also different among the four kinds of plants. (2) The content of C in the leaves of Calligonum arborescens and Caragana korshinskii Kom. were significantly higher than that of Nitraria tangutorum and Haloxylon ammodendron (p < 0.05). The N content in the leaves of Nitraria tangutorumS was significantly higher than that of the leaves of the other three plants (p < 0.05). No significant difference in the content of P in leaves of 4 plants (P > 0.05) (3) Based on the total variation (resulting from two factors: season and species) for each parameter in these four shrubs, the rank of CV for each parameter was P (28.34%) > C:P (24.70%) > N:P (19.07%) > N (17.49%) > C:N (16.89%) > C (2.91%). (4) Leaf C and N contents and leaf C:N, C:P and N:P mass ratios were mainly determined by plant species, and leaf P contents was mainly affected by growing season.

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  • 收稿日期:2019-08-30
  • 最后修改日期:2019-12-25
  • 录用日期:2020-01-03
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