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| 喀斯特高原黄壤区退化植物群落常见植物叶片氮同位素组成 |
| Nitrogen Isotope Ratios in Leaves from Degraded Plant Communities in A Yellow Soil Region of the Karst Plateau |
| 投稿时间：2018-09-18 修订日期：2018-10-08 |
| DOI：10.14050/j.cnki.1672-9250.2019.47.023 |
| 中文关键词: 稳定性氮同位素;喀斯特高原;黄壤;退化植物群落;生境异质性;元素化学计量比 |
| 英文关键词: stable nitrogen isotope ratio;karst plateau;yellow soil;degraded plant community;habitat heterogeneity;element stoichiometry |
| 基金项目:国家自然科学基金项目（41563007）；贵州省优秀青年科技人才培养对象专项资金项目（黔科合人字[2015]21号）；贵州省优秀科技教育人才省长资金项目（黔省专合字[2012]80号）；贵州省高层次创新型人才资金项目（黔人领发[2015]3号）。 |
| 作者 | 单位 | | 罗绪强1,2, 张桂玲2,3, 王世杰2, 阮英慧1, 刘兴1,2, 李勇2 | 1. 贵州师范学院 地理与资源学院, 贵阳 550018
2. 中国科学院普定喀斯特生态系统观测研究站, 贵州 普定 562100
3. 贵阳学院 化学与材料工程学院, 贵阳 550005 |
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| 中文摘要: |
| 氮是植物需求量最大的矿质营养元素。由于氮循环诸过程中的化学转化、物理运输等都有可能使其发生同位素分馏，植物稳定氮同位素组成是土壤-植物-大气连续体综合作用的整体响应，能较好的反映流域内与植物生理生态过程相联系的一系列环境信息，具有示踪、整合和指示等多项功能。为探讨喀斯特环境下黄壤区植物稳定氮同位素组成变异的影响因素及其相关关系，以喀斯特高原贵州省清镇市王家寨峰丛洼地小流域为例，选取流域内黄壤区退化植物群落3种植被类型中的4种常见植物为研究对象，分别对其叶片C、N、P、K、Ca、Mg元素含量和稳定氮同位素进行了测定分析。结果表明：（1）研究区植物叶片δ15N值的变化范围为-3.25‰～0.69‰，平均值为-1.04‰，变异程度较高，离散程度较大，呈负偏态分布。（2）植物叶片δ15N值在群落间和坡位间的差异均不显著（P>0.05）；（3）植物叶片δ15N值的种间变化趋势为小果蔷薇（-0.03‰） > 火棘（-0.24‰） > 过路黄（-1.58‰） > 粉枝莓（-2.29‰），差异显著（P<0.05）。（4）研究区植物叶片δ15N值受群落类型和物种因素的交互影响显著（P=0.016，R2=0.870）。（5）研究区植物叶片δ15N值受叶片K营养含量的影响较大，同时与C、N、P、K、Ca元素化学计量比之间的关系密切，叶片K、Ca营养含量间的调控是影响黄壤区植物叶片δ15N值的主要因素。 |
| 英文摘要: |
| Nitrogen is one of the most demanded mineral nutrients of plant. The isotopic fractionation of nitrogen happens in nitrogen cycling processes, e.g. chemical transformation and physical transport process. The stable nitrogen isotope ratio of plant is an integrating index of continuum interactions of soil-plant-atmosphere, and reflect a series of environmental information associated with physiological ecological processes of plant. In this study, in order to investigate affecting factors of the variation of nitrogen isotope compositions in plants in yellow soil regions of karst area and their relationship, we conducted researches in the Wangjia village, a small watershed of the karst plateau in Qingzhen, Guizhou. The leaf samples of four common plant species were collected in degraded plant communities with three different vegetation types and their contents of C, N, P, K, Ca and Mg as well as nitrogen stable isotope ratios were analyzed. The results showed that: (1) The δ15N values of leaves ranged from -3.25‰ to 0.69‰ (with an average of -1.04‰), with a distribution of high variation, large dispersion and negatively-skewed. (2) No significant difference (P>0.05) in δ15N values of plant leaves was found among different plant communities or/and different slope positions. (3) A trend of δ15N value was found among interspecies as Rosa cymosa (-0.03‰) > Pyracantha fortuneana (-0.24‰)> Lysimachia christinae (-1.58‰) > Rubus biflorus (-2.29‰), and the difference of their δ15N values was significant (P < 0.05). (4) The δ15N values of plant leaves in the study area were significantly affected by the interaction of community types and species factors (P=0.016, R2=0.870). (5) The δ15N values of plant leaves in the study area were affected significantly by contents of K in leaves, and the stoichiometric ratios of C, N, P, K and Ca related closely. The regulation of K and Ca contents might be the key factor affecting the δ15N value of plant leaf in the yellow soil area. |
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