Distinct fine root responses to precipitation changes in herbaceous and woody plants: A meta-analysis.
Distinct fine root responses to precipitation changes in herbaceous and woody plants: A meta-analysis.
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DOI：
10.1111/nph.16266
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发表时间：
2019-11
期刊：
影响因子：
--
通讯作者：
Peng Wang;Kailing Huang;Shuijin Hu
中科院分区：
文献类型：
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作者：
Peng Wang;Kailing Huang;Shuijin Hu
降水是决定陆地生态系统生产力的最重要因素之一。据预测，在未来的气候变化情景下，全球降水将发生更剧烈的变化，但对植物根系的影响仍不清楚。本研究基于154个野外模拟降水和测量根系生物量的实验，研究了草本和木本植物细根生物量对降水变化的响应。结果表明，草本植物和木本植物根系生物量对降水变化的响应不同。特别是，在干旱和半干旱生态系统中，降水增加对木本植物细根生物量的影响是一致的，但对草本植物根系的影响是可变的。相反，降水使草本植物根系生物量减少，而木本植物根系生物量没有减少。此外，随降水变化，干旱区根系响应的幅度大于湿区。总之，这些结果表明，草本植物和木本植物具有不同的生根策略来应对降水变化，特别是在水资源有限的生态系统中。这些结果表明，在未来气候变化情景下，根系对降水变化的响应可能对根系生产力和土壤碳动态产生关键影响。
Precipitation is one of the most important factors that determine productivity of terrestrial ecosystems. Precipitation across the globe is predicted to change more intensively under future climate change scenarios, but the resulting impact on plant roots remains unclear. In this study, based on 154 observations from experiments in which precipitation was manipulated in the field and root biomass was measured, we investigated responses in fine root biomass of herbaceous and woody plants to alterations in precipitation. We found that root biomass of herbaceous and woody plants differently responded to precipitation change. In particular, precipitation increase consistently enhanced fine-root biomass of woody plants but had variable effects on herb roots in arid and semi-arid ecosystems. In contrast, precipitation decrease reduced root biomass of herbaceous but not woody plants. In addition, with precipitation alteration, the magnitude of root responses was greater in dry than wet areas. Together, these results indicate that herbaceous and woody plants have different rooting strategies to cope with altered precipitation regimes, particularly in water-limited ecosystems. These findings suggest that root responses to precipitation change may critically influence root productivity and soil carbon dynamics under future climate change scenarios.