鼢鼠扰动草地的次生演替过程受生态系统分区生物量的影响

IF 4 2区 农林科学 Q2 SOIL SCIENCE European Journal of Soil Science Pub Date : 2024-10-28 DOI:10.1111/ejss.70000
Chunping Zhang, Qi Li, Runqiu Feng, Ping Li, Jie Liu, Yunfeng Yang
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引用次数: 0

摘要

在陆地生态系统中,资源可用性和土壤微生物生物量会随着生态恢复而发生重大变化。然而,资源化学计量和微生物生物量化学计量的变化往往并不一致,从而导致化学计量失衡,制约微生物的生长,进而影响植物群落的演替。土壤微生物适应这些失衡的机制,以及这种调整如何影响植物群落动态,在高寒草地上基本上仍未得到探索。为了解决这些问题,我们采用空间-时间替代法研究了中国青藏高原鼢鼠干扰草地次生演替过程中的生态化学计量。研究测量了植物-土壤-微生物之间的碳(C)、氮(N)和磷(P)含量,以及参与土壤微生物养分获取的土壤生态酶活性。结果表明,随着鼢鼠干扰草地的恢复,微生物及其植物资源之间的碳:磷和氮:磷失衡加剧。这导致微生物生长受到磷的限制,表现为平均矢量角超过 45°,C:P 的阈值元素比下降。作为回应,土壤微生物增加了获取磷的酶的产量,以缓解磷的限制。通过结构方程建模(SEM),我们发现植物-土壤-微生物系统中的碳氮磷比解释了植物地上生物量总变异的 74.5%。我们的结论是,在土壤生态酶活动的促进下,在植物-土壤-微生物系统中保持平衡的 C:N:P 化学计量比,可在鼢鼠干扰草地的恢复过程中提高植物多样性和净初级生产力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Ecosystem compartment stoichiometry drives the secondary succession processes of zokor-disturbed grassland

In terrestrial ecosystems, resource availability and soil microbial biomass are substantially changed with ecological recovery. However, the shifts in resource stoichiometry and microbial biomass stoichiometry often do not align, leading to stoichiometric imbalance that constrains microbial growth and, consequently, affects plant community succession. The mechanisms by which soil microbes acclimate to these imbalances and how such adjustments influence plant community dynamics remain largely unexplored in alpine grasslands. To address these processes, we examined ecological stoichiometry during the secondary succession of zokor-disturbed grassland on the Qinghai–Tibet Plateau, China, utilizing a space-for-time substitution approach. Carbon (C), nitrogen (N) and phosphorus (P) contents across plant–soil–microbe and soil ecoenzymatic activities involved in soil microbial nutrient acquisition were measured. The results indicated that C:P and N:P imbalances between microbes and their plant resources intensified with the recovery of zokor-disturbed grassland. This led to phosphorus limitation in microbial growth, as indicated by the mean vector angles exceeding 45° and decreased threshold element ratio of C:P. In response, soil microbes increased their production of P-acquiring enzymes to mitigate P limitation. Through structural equation modelling (SEM), we found that the C:N:P ratios within the plant–soil–microbe systems explained 74.5% of the total variance in plant aboveground biomass. We concluded that maintaining balanced C:N:P stoichiometric ratios in plant–soil–microbe systems, facilitated by soil ecoenzymatic activities, enhances plant diversity and net primary productivity during the recovery of zokor-disturbed grassland.

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来源期刊
European Journal of Soil Science
European Journal of Soil Science 农林科学-土壤科学
CiteScore
8.20
自引率
4.80%
发文量
117
审稿时长
5 months
期刊介绍: The EJSS is an international journal that publishes outstanding papers in soil science that advance the theoretical and mechanistic understanding of physical, chemical and biological processes and their interactions in soils acting from molecular to continental scales in natural and managed environments.
期刊最新文献
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