地下水深度降低降低了半咸淡湿地植物多样性,但增加了植物地上生物量分配

IF 4.1 2区 农林科学 Q1 AGRONOMY
Yangjian He, Mingliang Zhao, Lianjing Wang, Xiaojing Chu, Xiaojie Wang, Peiguang Li, Xiaoshuai Zhang, Weimin Song, Qingju Hao, Yiqi Zhao, Changsheng Jiang, Guangxuan Han
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引用次数: 0

摘要

背景与目的植物生物量分配,通常表示为根与茎比(RSR),是了解植物对环境变化和全球碳分布的适应的重要基础。气候变化驱动的地下水深度变化会显著影响咸淡湿地生态系统的生物量分配。然而,植物群落RSR对地下水深度变化的响应尚不清楚。为了解决这一问题,我们在黄河三角洲微咸湿地进行了3个地下水深度梯度(-100 cm、-60 cm和-20 cm)的原位实验。结果微咸湿地植物群落生物量分配变化主要受优势种的影响。随着地下水深度从-100 cm减小到-20 cm,土壤电导率增加,植物多样性下降,优势种由芦苇(Phragmites australis)向盐绵(Suaeda salsa)转移。地下水深度的减少也促进了植物群落中更多的地上生物量分配。与-100 cm和-60 cm的地下水深度相比,-20 cm的地下水深度较浅,土壤盐分和养分水平(包括微生物生物量碳、全氮和全磷)较高,这有助于优势物种和植物群落的生物量分配增加。此外,随着地下水深度的减小,地上生物量分配的增加与植物多样性的减少和物种组成的变化有关。结论地下水深度降低通过增加土壤盐分和养分来促进咸淡湿地生态系统地上生物量分配,同时减少植物多样性,这与最优分配理论一致。这些发现为预测未来地下水变化情景下咸淡湿地植被生产力和制定管理策略提供了科学依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Reduced groundwater depth decreases plant diversity but increases plant aboveground biomass allocation in a brackish wetland

Background and Aims

Plant biomass allocation, often expressed as the root: shoot ratio (RSR), is essential for understanding plant adaptations to environmental changes and global carbon distribution. Changes in groundwater depth driven by climate change can significantly affect biomass allocation in brackish wetland ecosystems. However, the response of the RSR in plant communities to groundwater depth changes remains unclear.

Methods

To address this, we conducted in situ experiments across three groundwater depth gradients (-100 cm, -60 cm, and -20 cm) in a brackish wetland in the Yellow River Delta.

Results

Our results showed that biomass allocation changes in plant communities are primarily influenced by dominant species in the brackish wetland. As groundwater depth decreased from -100 cm to -20 cm, soil electrical conductivity increased, plant diversity declined, and the dominant species shifted from Phragmites australis to Suaeda salsa. Reduced groundwater depth also promoted greater aboveground biomass allocation within plant communities. Compared to the deeper groundwater depths of -100 cm and -60 cm, the shallower groundwater depth of -20 cm was associated with higher soil salinity and nutrient levels, including microbial biomass carbon, total nitrogen, and total phosphorus, which contributed to the increased biomass allocation to aboveground structures in both dominant species and plant communities. Additionally, the increased aboveground biomass allocation with decreasing groundwater depth is related to the reduction in plant diversity and the shift in plant species composition.

Conclusion

Our findings confirm that reduced groundwater depth enhances aboveground biomass allocation by increasing soil salinity and nutrients while simultaneously reducing plant diversity in brackish wetland ecosystems, which is consistent with optimal allocation theory. These insights provide a scientific basis for predicting vegetation productivity and developing management strategies for brackish wetlands under future groundwater change scenarios.

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来源期刊
Plant and Soil
Plant and Soil 农林科学-农艺学
CiteScore
8.20
自引率
8.20%
发文量
543
审稿时长
2.5 months
期刊介绍: Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.
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