Effects of Inorganic and Organic Fertilizers on Soil CO2 Efflux and Labile Organic Carbon Pools in an Intensively Managed Moso Bamboo (Phyllostachys pubescens) Plantation in Subtropical China

Use of permanent beds combined with controlled traffic (PB) has been proposed as an alternative planting system for reducing soil erosion and compaction while increasing soil organic carbon (SOC) in irrigated, annual-crop based systems in Mediterranean conditions. The objective of this study was to characterise, in space (beds and furrows with and without traffic) and time (hours, days, and weeks), soil CO2 efflux in PB compared with conventionally tilled bed planting (CB) and with a variant of PB in which subsoiling was performed in trafficked furrows (DPB). The three treatments were combined with controlled traffic. Tillage resulted in abrupt CO2 effluxes that lowered rapidly within hours. However, in CB, soil CO2 effluxes increased again significantly 12 days after tillage compared with PB or DPB. These differences were due to higher emissions from beds than from furrows where the soil had been compacted during the harrowing that formed the beds. In DPB, CO2 effluxes increased in furrows with traffic after subsoiling and the effect was maintained during the study despite subsequent traffic. Soil CO2 efflux increased with soil temperature (measured concomitantly) except after soil tillage. Tillage reduced SOC in both CB and DPB compared with PB.

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Long-term intensive management effects on soil organic carbon pools and chemical composition in Moso bamboo (Phyllostachys pubescens) forests in subtropical China

Forest Ecology and Management ◽

10.1016/j.foreco.2013.04.021 ◽

2013 ◽

Vol 303 ◽

pp. 121-130 ◽

Cited By ~ 105

Author(s):

Yongfu Li ◽

Jiaojiao Zhang ◽

Scott X. Chang ◽

Peikun Jiang ◽

Guomo Zhou ◽

...

Keyword(s):

Chemical Composition ◽

Organic Carbon ◽

Soil Organic Carbon ◽

Carbon Pools ◽

Phyllostachys Pubescens ◽

Intensive Management ◽

Subtropical China ◽

Soil Organic Carbon Pools ◽

Management Effects

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Soil CO2 concentration and efflux from three forests in subtropical China

Soil Research ◽

10.1071/sr12109 ◽

2012 ◽

Vol 50 (4) ◽

pp. 328 ◽

Cited By ~ 3

Author(s):

Lixia Zhou ◽

Shenglei Fu ◽

Mingmao Ding ◽

Zhigang Yi ◽

Weimin Yi

Keyword(s):

Soil Depth ◽

Soil Surface ◽

Co2 Concentration ◽

Soil Co2 Efflux ◽

Co2 Efflux ◽

Soil Co2 ◽

Subtropical China ◽

Mean Values ◽

Soil Co2 Concentration ◽

The Mean

Measurements of soil CO2 efflux and soil CO2 concentration concurrently are important for understanding the mechanism and regulation of CO2 in the soil. We have analysed CO2 concentration in a soil profile and soil CO2 efflux in three typical forests in subtropical China: monsoon evergreen broad-leaved forest (BF, 400 years old), pine and broad-leaved mixed forest (MF, 80 years old), and pine forest (PF, 70 years old). A portable soil CO2 sampler of simple sample operation was designed and used. The seasonal patterns of soil surface CO2 efflux and soil CO2 concentration were observed, and were positively correlated with rainfall, soil temperature, and moisture. The mean values of soil CO2 concentrations at the 15, 30, 45, and 60 cm soil depth were higher in BF (3368–9243 μL L–1) than in MF (1495–7662 μL L–1) and PF (1566–5730 μL L–1), while the mean values of soil surface CO2 efflux (Rsurface) were 0.55 ± 0.11 g m–2 h–1 in BF, 0.52 ± 0.10 g m–2 h–1 in MF, and 0.45 ± 0.07 g m–2 h–1 in PF. Soil CO2 concentration and Rsurface increased gradually with the age of the forests, but the incremental increase in soil CO2 concentration will be greater than that of Rsurface in MF and PF compared with BF. The data suggested that, although older forests have more C, younger forests probably will sequester C as CO2 faster than older forests.

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Understory vegetation management affected greenhouse gas emissions and labile organic carbon pools in an intensively managed Chinese chestnut plantation

Plant and Soil ◽

10.1007/s11104-013-1996-2 ◽

2013 ◽

Vol 376 (1-2) ◽

pp. 363-375 ◽

Cited By ~ 28

Author(s):

Jiaojiao Zhang ◽

Yongfu Li ◽

Scott X. Chang ◽

Peikun Jiang ◽

Guomo Zhou ◽

...

Keyword(s):

Organic Carbon ◽

Greenhouse Gas Emissions ◽

Greenhouse Gas ◽

Vegetation Management ◽

Understory Vegetation ◽

Carbon Pools ◽

Gas Emissions ◽

Labile Organic Carbon ◽

Intensively Managed ◽

Understory Vegetation Management

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Seasonal changes in soil labile organic carbon pools within a Phyllostachys praecox stand under high rate fertilization and winter mulch in subtropical China

Forest Ecology and Management ◽

10.1016/j.foreco.2006.06.010 ◽

2006 ◽

Vol 236 (1) ◽

pp. 30-36 ◽

Cited By ~ 80

Author(s):

P.K. Jiang ◽

Q.F. Xu ◽

Z.H. Xu ◽

Z.H. Cao

Keyword(s):

Organic Carbon ◽

Seasonal Changes ◽

High Rate ◽

Carbon Pools ◽

Subtropical China ◽

Labile Organic Carbon ◽

Soil Labile Organic Carbon ◽

Winter Mulch ◽

Phyllostachys Praecox

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The impact of extreme summer drought on the short-term carbon coupling of photosynthesis to soil CO<sub>2</sub> efflux in a temperate grassland

Biogeosciences ◽

10.5194/bg-11-961-2014 ◽

2014 ◽

Vol 11 (4) ◽

pp. 961-975 ◽

Cited By ~ 27

Author(s):

S. Burri ◽

P. Sturm ◽

U. E. Prechsl ◽

A. Knohl ◽

N. Buchmann

Keyword(s):

Soil Co2 Efflux ◽

Soil Drought ◽

Summer Drought ◽

Co2 Efflux ◽

Soil Co2 ◽

Short Term ◽

Below Ground ◽

Intensively Managed ◽

Grass Sward ◽

The Impact

Abstract. Along with predicted climate change, increased risks for summer drought are projected for Central Europe. However, large knowledge gaps exist in terms of how drought events influence the short-term ecosystem carbon cycle. Here, we present results from 13CO2 pulse labeling experiments at an intensively managed lowland grassland in Switzerland. We investigated the effect of extreme summer drought on the short-term coupling of freshly assimilated photosynthates in shoots to roots as well as to soil CO2 efflux. Summer drought was simulated using rainout shelters during two field seasons (2010 and 2011). Soil CO2 efflux and its isotopic composition were measured with custom-built chambers coupled to a quantum cascade laser spectrometer (QCLAS-ISO, Aerodyne Research Inc., MA, USA). During the 90 min pulse labeling experiments, we added 99.9 atom % 13CO2 to the grass sward. In addition to the isotopic analysis of soil CO2 efflux, this label was traced over 31 days into bulk shoots, roots and soil. Drought reduced the incorporation of recently fixed carbon into the shoots, but increased the relative allocation of fresh assimilates below ground compared to the control grasslands. Contrary to our hypothesis, we did not find a change of allocation speed in response to drought. Although drought clearly reduced soil CO2 efflux rates, about 75% of total tracer uptake in control plots was lost via soil CO2 efflux during 19 days after pulse labeling, compared to only about 60% under drought conditions. Thus, the short-term coupling of above- and below-ground processes was reduced in response to summer drought. The occurrence of a natural spring drought in 2011 lead to comparable albeit weaker drought responses increasing the confidence in the generalizability of our findings.

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