Contrasting Dynamics in the Fine Root Mass of Angiosperm and Gymnosperm Forests on the Global Scale
Contrasting Dynamics in the Fine Root Mass of Angiosperm and Gymnosperm Forests on the Global Scale
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DOI：
10.1007/s10021-022-00766-5
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发表时间：
2022-05
期刊：
影响因子：
3.7
通讯作者：
Cunguo Wang;I. Brunner;Shengwei Zong;Maihe Li
中科院分区：
文献类型：
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作者：
Cunguo Wang;I. Brunner;Shengwei Zong;Maihe Li
预测森林碳循环需要准确评估细根季节动态的大尺度模式，并深入了解生物和非生物因素如何直接和/或间接控制细根生物量（FB）、坏死生物量（FN）和生物量/坏死生物量比（FBN）的变化。我们分析了67项研究的1119个FB和FBN观测数据，并利用结构方程模型分析了森林生物群系（北方、温带、热带）、进化划分（被子植物与裸子植物）、气候（月度与年度）、地理和地貌特征对FB、FN和FBN的相对贡献。温带森林比热带森林和北方森林具有更高的植被消耗率和更低的植被消耗率。裸子植物林与被子植物林相比，在全球尺度上，裸子植物林的植被覆盖度和植被覆盖度显著小于被子植物林，但植被覆盖度与被子植物林相似。在热带和温带生物群系中，被子植物林的FB、FN和FBN的季节分布与裸子植物林不同。气候和土壤变量对细根动态的影响占主导地位。地貌特性通过影响土壤和气候条件直接和/或间接调节细根动态。月尺度和年尺度上，温度和降水对土壤肥力、肥力和肥力的直接影响较强，并通过土壤性质介导间接影响。我们的综合研究表明，细根对环境因子的响应随进化分裂和森林生物群系的变化而变化，这表明未来的气候变化可能会改变共存物种（如被子植物和裸子植物）之间的竞争关系、地下碳储量以及生态系统的组成和多样性。
Predicting forest carbon cycling requires the accurate assessment of large-scale patterns of fine root seasonal dynamics, and thorough comprehension of how biotic and abiotic factors exert direct and/or indirect control over the variation in fine root biomass (FB), necromass stocks (FN) and the biomass/necromass ratio (FBN). We analyzed 67 studies with 1119 observations of FB and FN and used structural equation modeling to examine the relative contributions of the forest biome (borealversustemperateversustropical), evolutionary division (angiospermsversusgymnosperms), climate (monthlyversusannual), edaphic and geomorphic properties in determining FB, FN and FBN. Temperate forests had a greater FB but lower FN than tropical and boreal forests. Compared with angiosperm forests, gymnosperm forests had a significantly smaller FB and FN but a similar FBN on the global scale. Angiosperm forests had different seasonal patterns of FB, FN and FBN compared to gymnosperm forests in tropical and temperate biomes throughout a year. Climatic and edaphic variables had dominant effects on fine root dynamics. Geomorphic properties directly and/or indirectly mediated fine root dynamics by influencing soil and climatic conditions. Temperature and precipitation at the monthly and annual scales exhibited strong direct effects on FB, FN and FBN, and indirect effects mediated through soil properties. Our synthesis provides evidence that responses of fine roots to environmental factors vary with both evolutionary division and forest biome, suggesting that future climate changes may alter the competition relations among co-existing species (for example, angiospermsversusgymnosperms), belowground carbon stocks, and also ecosystem composition and diversity.