Drought and recovery effects on belowground respiration dynamics and the partitioning of recent carbon in managed and abandoned grassland.,Global Change Biology

当前位置： X-MOL 学术 › Glob. Change Biol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Drought and recovery effects on belowground respiration dynamics and the partitioning of recent carbon in managed and abandoned grassland.
Global Change Biology ( IF 10.8 ) Pub Date : 2020-04-28 , DOI: 10.1111/gcb.15131
Johannes Ingrisch ₁ , Stefan Karlowsky _{2,

3} , Roland Hasibeder ₁ , Gerd Gleixner ₂ , Michael Bahn ₁

Affiliation

The supply of soil respiration with recent photoassimilates is an important and fast pathway for respiratory loss of carbon (C). To date it is unknown how drought and land‐use change interactively influence the dynamics of recent C in soil‐respired CO₂. In an in situ common‐garden experiment, we exposed soil‐vegetation monoliths from a managed and a nearby abandoned mountain grassland to an experimental drought. Based on two ¹³CO₂ pulse‐labelling campaigns, we traced recently assimilated C in soil respiration during drought, rewetting and early recovery. Independent of grassland management, drought reduced the absolute allocation of recent C to soil respiration. Rewetting triggered a respiration pulse, which was strongly fuelled by C assimilated during drought. In comparison to the managed grassland, the abandoned grassland partitioned more recent C to belowground respiration than to root C storage under ample water supply. Interestingly, this pattern was reversed under drought. We suggest that these different response patterns reflect strategies of the managed and the abandoned grassland to enhance their respective resilience to drought, by fostering their resistance and recovery respectively. We conclude that while severe drought can override the effects of abandonment of grassland management on the respiratory dynamics of recent C, abandonment alters strategies of belowground assimilate investment, with consequences for soil‐CO₂ fluxes during drought and drought‐recovery.

中文翻译：

干旱和恢复对管理和废弃草地的地下呼吸动力学和近期碳分配的影响。

最近的光同化作用物在土壤呼吸中的供应是呼吸碳损失的重要且快速的途径。迄今为止，尚不清楚干旱和土地利用的变化如何相互作用影响土壤呼吸的CO ₂中最近碳的动态。在一个原地普通花园实验中，我们将一个有管理的和附近废弃的高山草地上的土壤植被整体暴露于实验干旱中。基于两个¹³ CO ₂脉冲标记运动，我们追踪了干旱，再湿润和早期恢复期间土壤呼吸中最近吸收的碳。独立于草地管理，干旱减少了近期碳在土壤呼吸中的绝对分配。再湿会触发呼吸脉冲，干旱期间吸收的碳会极大地促进呼吸脉冲。与被管理的草地相比，在充足的供水条件下，废弃的草地将较新的碳分配给地下呼吸，而不是分配给根系碳。有趣的是，这种模式在干旱下被逆转了。我们建议这些不同的响应方式反映了被管理和被废弃草地分别通过增强抵抗力和恢复能力来增强其抗旱能力的策略。干旱和干旱恢复期间有_2个通量。

更新日期：2020-04-28

点击分享查看原文

点击收藏

公开下载

阅读更多本刊新发论文本刊介绍/投稿指南