基因型丰富度通过改变土壤氮库影响克隆植物对无机氮的吸收和对氮形态的偏好

IF 5.1 1区 农林科学 Q1 SOIL SCIENCE Biology and Fertility of Soils Pub Date : 2024-06-24 DOI:10.1007/s00374-024-01837-6
Jia-Tao Zhu, Jun-Qin Gao, Wei Xue, Qian-Wei Li, Fei-Hai Yu
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摘要

与物种丰富度类似,植物的基因型丰富度在生态系统的结构和功能中也起着举足轻重的作用。虽然种内变异性对生态系统功能的贡献已得到充分证实,但基因型丰富度对氮(N)吸收能力的影响机制仍然鲜为人知。我们在微生态系统中建立了由 1、4 或 8 个基因型组成的克隆植物水蓑衣(Hydrocotyle verticillata)实验种群,并进行了 15N 标记以量化植物对氮的吸收。8个基因型种群的NH4+-N吸收率明显高于1个和4个基因型种群,而基因型丰富度并不影响NO3--N吸收率。增加基因型的丰富度还会提高NH4+-N的吸收偏好,降低NO3--N的吸收偏好。此外,基因型丰富度的增加还促进了土壤氮库的转化,导致土壤总氮含量的减少和土壤 NH4+-N 的增加,从而引起群体对氮吸收偏好的改变。我们的研究结果凸显了基因型丰富度对植物种群氮吸收和氮形式偏好的重要性。氮吸收和氮形式偏好的这种种内变异可能会进一步影响种群动态和生态系统功能。
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Genotypic richness affects inorganic N uptake and N form preference of a clonal plant via altering soil N pools

Similar to species richness, genotypic richness of plants plays a pivotal role in the structure and function of ecosystems. While the contribution of intraspecific variability to ecosystem function has been well-established, the mechanisms underlying the effect of genotypic richness on nitrogen (N) uptake patten remain poorly understood. We established experimental populations consisting of 1, 4, or 8 genotypes of the clonal plant Hydrocotyle verticillata in microcosms and conducted 15N-labeling to quantify plant N uptake. NH4+-N uptake rate of the populations with 8 genotypes was significantly higher than that of the populations with 1- and 4-genotypes, while genotypic richness did not influence NO3-N uptake rate. Increasing genotypic richness also enhanced NH4+-N uptake preference and reduced NO3-N uptake preference. Additionally, increasing genotypic richness facilitated the transformation of the soil nitrogen pool, resulting in a reduction of total soil N content and an increase in soil NH4+-N, thereby causing a shift in population N uptake preference. Our findings highlight the importance of genotypic richness on both N uptake and N form preference of plant populations. Such intraspecific variability in N uptake and N form preference may further influence population dynamics and ecosystem function.

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来源期刊
Biology and Fertility of Soils
Biology and Fertility of Soils 农林科学-土壤科学
CiteScore
11.80
自引率
10.80%
发文量
62
审稿时长
2.2 months
期刊介绍: Biology and Fertility of Soils publishes in English original papers, reviews and short communications on all fundamental and applied aspects of biology – microflora and microfauna - and fertility of soils. It offers a forum for research aimed at broadening the understanding of biological functions, processes and interactions in soils, particularly concerning the increasing demands of agriculture, deforestation and industrialization. The journal includes articles on techniques and methods that evaluate processes, biogeochemical interactions and ecological stresses, and sometimes presents special issues on relevant topics.
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