Regulation of priming effect by soil organic matter stability over a broad geographic scale
Regulation of priming effect by soil organic matter stability over a broad geographic scale
复制标题
广泛地理范围内土壤有机质稳定性对启动效应的调节
DOI：
10.1038/s41467-019-13119-z
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发表时间：
2019-11-08
影响因子：
16.6
通讯作者：
Yang, Yuanhe
中科院分区：
文献类型：
--
作者：
Chen, Leiyi;Liu, Li;Yang, Yuanhe
植物碳(C)输入对土壤有机质（SOM）分解的影响（启动效应）是控制土壤碳动态的重要生物地球化学过程。然而，启动效应的模式和驱动因素仍然是隐藏的，特别是在各种气候和土壤条件下的广泛地理尺度上。我们的研究结果表明，与植物、土壤和微生物特性相比，以化学抗性和物理化学保护为特征的SOM稳定性更能解释引发效应的差异。高启动强度（高达基础呼吸的137%）与复杂的SOM化学结构和低矿物-有机关联有关。在地球系统模型中，为了准确预测环境变化下土壤C的动态，应考虑启动效应对SOM稳定机制的依赖性。
The modification of soil organic matter (SOM) decomposition by plant carbon (C) input (priming effect) represents a critical biogeochemical process that controls soil C dynamics. However, the patterns and drivers of the priming effect remain hidden, especially over broad geographic scales under various climate and soil conditions. By combining systematic field and laboratory analyses based on multiple analytical and statistical approaches, we explore the determinants of priming intensity along a 2200 km grassland transect on the Tibetan Plateau. Our results show that SOM stability characterized by chemical recalcitrance and physico-chemical protection explains more variance in the priming effect than plant, soil and microbial properties. High priming intensity (up to 137% of basal respiration) is associated with complex SOM chemical structures and low mineral-organic associations. The dependence of priming effect on SOM stabilization mechanisms should be considered in Earth System Models to accurately predict soil C dynamics under changing environments.