.png){kind=icon}
返回
Priming effects decrease with the quantity of cover crop residues-Potential implications for soil carbon sequestration
.png){kind=icon}
OA
AI
DOI：10.1016/j.soilbio.2023.109110.png)
.png){kind=icon}
.png){kind=icon}
分享.png){kind=icon}
收藏
摘要
En 中文
Meta-analyses suggest a global potential of cover crops to increase soil organic carbon (SOC) stocks, yet with a large variation across studies, which underlines the need to understand the effect of cover crops on carbon (C) sequestration under specific soil and climate conditions. We studied the C sequestration potential from cover crops, based on a Danish long-term field experiment (LTE) initiated in 1997, where SOC and C in the fractions of particulate organic matter (POM) and mineral associated organic matter (MAOM) was measured to 1-m depth. Next, we performed a mesocosm study where the fate of 14C-labeled cover crop residues (fodder radish, Raphanus sativus L.) and SOC priming were traced in two texturally similar soils from the LTE with different SOC con-centrations (2.0 vs. 2.6% SOC). The results showed that cover cropping for up two decades had negligible effect on SOC in POM and MAOM fractions. Yet, the mesocosm study showed considerable overall SOC increases (20-25% of added C) when the cover crop C input exceeded rates of 0.2-0.3 mg C g-1 in the two soils. This was due to a combination of new SOC formation and priming effects shifting from positive to negative. The input rates of 0.2-0.3 mg C g-1 correspond to the C input from cover crops with an aboveground yield of approxi-mately 0.7-1.1 Mg dry matter ha-1, which is a level not always achieved at the field site. The combined ob-servations from the field and mesocosm study suggest that SOC buildup was not constrained by soil C saturation, but rather by low cover crop productivity and/or positive priming effects. Therefore, agricultural management practices (e.g., species choice and sowing time) should be adopted to achieve a sufficient cover crop C input to secure that the positive priming effect is not exceeding the rate of SOC formation.
Keyword:
Cover crops
Carbon sequestration
Priming effects
Particulate organic matter
Mineral associated organic matter
AI总结
对已上传原文的论文进行重点信息的提取，主要内容包括：简要概述、研究摘要、背景介绍、关键亮点、图文解析、展望与总结。
期刊
IF:
10.3
论文数:
9.0K
被引数:
6.0W
机构
引用论文
Manipulating cover crop growth by adjusting sowing time and cereal inter-row spacing to enhance residual nitrogen effects.png)
FIELD CROPS RESEARCH
FIELD CROPS RESEARCHIF6.4
PREAI
分享收藏Low stabilization of aboveground crop residue carbon in sandy soils of Swedish long-term experimentsGEODERMA
GEODERMAIF6.6
PREAI
分享收藏Rotavirus temperature-sensitive mutants are genetically stable and participate in reassortment during mixed infection of miceVirology
VirologyIF0
PREAI
分享收藏Carbon input by roots into the soil: Quantification of rhizodeposition from root to ecosystem scaleOAAI
OAAI分享收藏
查看更多内容