Response to Zhong and Zhou: P-acquisition strategies and total soil C sequestration

AbstractSoil carbon (C) reservoirs held in forests play a significant role in the global C cycle. However, harvesting natural forests tend to lead to soil C loss, which can be countered by the establishment of plantations after clear cutting. Therefore, there is a need to determine how forest management can affect soil C sequestration. The management of stand density could provide an effective tool to control soil C sequestration, yet how stand density influences soil C remains an open question. To address this question, we investigated soil C storage in 8-year pure hybrid larch (Larix spp.) plantations with three densities (2000 trees ha−1, 3300 trees ha−1 and 4400 trees ha−1), established following the harvesting of secondary mixed natural forest. We found that soil C storage increased with higher tree density, which mainly correlated with increases of dissolved organic C as well as litter and root C input. In addition, soil respiration decreased with higher tree density during the most productive periods of warm and moist conditions. The reduced SOM decomposition suggested by lowered respiration was also corroborated with reduced levels of plant litter decomposition. The stimulated inputs and reduced exports of C from the forest floor resulted in a 40% higher soil C stock in high- compared to low-density forests within 8 years after plantation, providing effective advice for forest management to promote soil C sequestration in ecosystems.

Download Full-text

A disconnect between O horizon and mineral soil carbon – Implications for soil C sequestration

Acta Oecologica ◽

10.1016/j.actao.2008.10.004 ◽

2009 ◽

Vol 35 (2) ◽

pp. 218-226 ◽

Cited By ~ 15

Author(s):

Charles T. Garten

Keyword(s):

Soil Carbon ◽

Mineral Soil ◽

C Sequestration ◽

Soil C ◽

Soil C Sequestration

Download Full-text

Potential soil carbon sequestration of agricultural land around the world

10.5194/egusphere-egu21-3083 ◽

2021 ◽

Author(s):

Sylvia Vetter ◽

Michael Martin ◽

Pete Smith

Keyword(s):

Organic Carbon ◽

Management Practices ◽

Agricultural Land ◽

Ghg Emissions ◽

C Sequestration ◽

Organic Soils ◽

Soil C ◽

Sequestration Potential ◽

The World ◽

Soil C Sequestration

Reducing greenhouse gas (GHG) emissions in to the atmosphere to limit global warming is the big challenge of the coming decades. The focus lies on negative emission technologies to remove GHGs from the atmosphere from different sectors. Agriculture produces around a quarter of all the anthropogenic GHGs globally (including land use change and afforestation). Reducing these net emissions can be achieved through techniques that increase the soil organic carbon (SOC) stocks. These techniques include improved management practices in agriculture and grassland systems, which increase the organic carbon (C) input or reduce soil disturbances. The C sequestration potential differs among soils depending on climate, soil properties and management, with the highest potential for poor soils (SOC stock farthest from saturation).Modelling can be used to estimate the technical potential to sequester C of agricultural land under different mitigation practices for the next decades under different climate scenarios. The ECOSSE model was developed to simulate soil C dynamics and GHG emissions in mineral and organic soils. A spatial version of the model (GlobalECOSSE) was adapted to simulate agricultural soils around the world to calculate the SOC change under changing management and climate.Practices like different tillage management, crop rotations and residue incorporation showed regional differences and the importance of adapting mitigation practices under an increased changing climate. A fast adoption of practices that increase SOC has its own challenges, as the potential to sequester C is high until the soil reached a new C equilibrium. Therefore, the potential to use soil C sequestration to reduce overall GHG emissions is limited. The results showed a high potential to sequester C until 2050 but much lower rates in the second half of the century, highlighting the importance of using soil C sequestration in the coming decades to reach net zero by 2050.

Download Full-text

Microbial activity and soil C sequestration for reduced and conventional tillage cotton

Applied Soil Ecology ◽

10.1016/j.apsoil.2007.10.006 ◽

2008 ◽

Vol 38 (2) ◽

pp. 168-173 ◽

Cited By ~ 31

Author(s):

Alan L. Wright ◽

Frank M. Hons ◽

Robert G. Lemon ◽

Mark L. McFarland ◽

Robert L. Nichols

Keyword(s):

Microbial Activity ◽

C Sequestration ◽

Conventional Tillage ◽

Soil C ◽

Soil C Sequestration

Download Full-text

Economic Feasibility of Soil C Sequestration in U.S. Agricultural Soils

Agriculture Practices and Policies for Carbon Sequestration in Soil ◽

10.1201/9781420032291.ch32 ◽

2002 ◽

Cited By ~ 1

Author(s):

M Sperow ◽

R House ◽

Keith Paustian ◽

M Peters

Keyword(s):

Agricultural Soils ◽

C Sequestration ◽

Economic Feasibility ◽

Soil C ◽

Soil C Sequestration

Download Full-text

Economic Feasibility of Soil C Sequestration in U.S. Agricultural Soils

Agricultural Practices and Policies for Carbon Sequestration in Soil ◽

10.1201/9781420032291-36 ◽

2016 ◽

pp. 361-372

Keyword(s):

Agricultural Soils ◽

C Sequestration ◽

Economic Feasibility ◽

Soil C ◽

Soil C Sequestration

Download Full-text

Organic soil amendments as a tool to increase biological activity and C sequestration in clay soil

10.5194/egusphere-egu21-11965 ◽

2021 ◽

Author(s):

Jussi Heinonsalo ◽

Anna-Reetta Salonen ◽

Rashmi Shrestha ◽

Subin Kalu ◽

Outi-Maaria Sietiö ◽

...

Keyword(s):

Soil Structure ◽

Soil Amendments ◽

C Sequestration ◽

Organic Soil ◽

Plant Production ◽

Soil C ◽

Soil Microbial ◽

Organic Soil Amendments ◽

C Stocks ◽

Soil C Sequestration

Soil C sequestration through improved agricultural management practices has been suggested to be a cost-efficient tool to mitigate climate change as increased soil C storage removes CO2 from the atmosphere. In addition, improved soil organic carbon (SOC) content has positive impacts on farming though better soil structure and resilience against climate extremes through e.g. better water holding capacity. In some parts of the world, low SOC content is highly critical problem for overall cultivability of soils because under certain threshold levels of SOC, soil loses its ability to maintain essential ecosystem services for plant production. Soil organic amendments may increase soil C stocks, improve soil structure and boost soil microbial activities with potential benefits in plant growth and soil C sequestration. Additional organic substrates may stimulate microbial diversity that has been connected to higher SOC content and healthy soils.We performed a two-year field experiment where the aim was to investigate whether different organic soil amendments have an impact on soil microbial parameters, soil structure and C sequestration.The experiment was performed in Parainen in southern Finland on a clay field where oat (Avena sativa) was the cultivated crop. Four different organic soil amendments were used (two wood-based fiber products that were leftover side streams of pulp and paper industry; and two different wood-based biochars). Soil amendments were applied in 2016. Soil C/N analysis was performed in the autumns 2016-2018 and soil aggregate in the summer and autumn 2018, as well as measures to estimate soil microbial activity: microbial biomass, soil respiration, enzymatic assays, microbial community analysis with Biolog &#174;&#160; EcoPlates and litter bag decomposition experiment. The relative share of bacteria and fungi was determined using qPCR from soil samples taken in the autumns 2016, 2017 and 2018.Data on how the studied organic soil amendments influence soil structure and C content, as well as soil microbial parameters will be presented and discussed.

Download Full-text