Soil-released carbon dioxide from microbial biomass carbon in the cultivated soils of karst areas of southwest China

Piao, He-Chun; Wu, Yunchao; Hong, Youwei; Yuan, Zi‐Qiang

doi:10.1007/s003749900189

Cited by 27 publications

(6 citation statements)

References 19 publications

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“…The 1-box model enabled us to estimate the time until 95% of the C in a pool was replaced, which corresponds to 3τ. In accordance with our estimate, the mean τs of the dynamic C pools of soils from the US corn belt were 100 days (Collins et al 2000) and those of microbial biomass C from Chinese karst soils were 105 days (Piao et al 2000).…”

supporting

confidence: 89%

Microbial assimilation of plant-derived carbon in soil traced by isotope analysis

Pelz

Abraham²,

Saurer

et al. 2005

Biol Fertil Soils

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supporting

confidence: 89%

Microbial assimilation of plant-derived carbon in soil traced by isotope analysis

Pelz

Abraham²,

Saurer

et al. 2005

Biol Fertil Soils

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“…The lack of this flush may be the main reason why in this study the CO 2 evolution rate amounted to only 6% of that measured in an 18-day laboratory study with a similar soil, which was sun-dried and rewetted (Wichern et al, 2003). The CO 2 evolution rates of the present study are within the range of 0-300 mg CO 2 -C m −2 h −1 obtained by others using the static chamber method for field measurements at arable sites in humid temper- Table 2 Weighted mean, minimum and maximum of the CO 2 evolution rate and of the soil temperature at 5 cm depth during the measurement of the CO 2 evolution rate over a 12-day irrigation cycle for three plot types at the oasis of Balad Seet, Oman ate regions (Franzluebbers et al, 1995;Jensen et al, 1996;Piao et al, 2000). In addition, they are also in the range of those results obtained with the dynamic chamber method in humid temperate regions (Jensen et al, 1996).…”

Section: Resultsmentioning

confidence: 99%

Field measurements of the CO2 evolution rate under different crops during an irrigation cycle in a mountain oasis of Oman

Wichern

Luedeling

Müller

et al. 2004

Applied Soil Ecology

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For millennia oasis agriculture has been the backbone of rural livelihood in the desertic Sultanate of Oman. However, little is known about the functioning of these oasis systems, in particular with respect to the C turnover. The objective was to determine the effects of crop, i.e. alfalfa, wheat and bare fallow on the CO 2 evolution rate during an irrigation cycle in relation to changes in soil water content and soil temperature. The gravimetric soil water content decreased from initially 24% to approximately 16% within 7 days after irrigation. The mean CO 2 evolution rates increased significantly in the order fallow (27.4 mg C m −2 h −1) < wheat (45.5 mg C m −2 h −1) < alfalfa (97.5 mg C m −2 h −1). It can be calculated from these data that the CO 2 evolution rate of the alfalfa root system was nearly four times higher than the corresponding rate in the wheat root system. The decline in CO 2 evolution rate, especially during the first 4 days after irrigation, was significantly related to the decline in the gravimetric water content, with r = 0.70. CO 2 evolution rate and soil temperature at 5 cm depth were negatively correlated (r = −0.56, n = 261) due to increasing soil temperature with decreasing gravimetric water content.

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“…As the epicenter of karst landforms in Southwest China, Guizhou Province stands as one of the country's largest and most extensive typical karst areas (He et al 2022). Owing to soil acidi cation and erosion, there has been signi cant loss of soil nutrients and a sharp decline in productivity, with yellow and limestone soils being the predominant soil types in this region (Piao et al 2000;Zhou et al 2023). Given the ongoing destruction of the ecological environment and economic regression, animal husbandry emerges as a promising avenue to both restore the environment and promote economic development of the area (Song et al 2018).…”

Section: Introductionmentioning

confidence: 99%

RETRACTED: Unveilling the impact of phosphorus availability on growth, root morphological and physiological traits of alfalfa (Medicago sativa L.) with contrasting aluminum tolerance in acidic soils

HAO,

Wang,

et al. 2024

Preprint

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Background and aims The cultivation of alfalfa (Medicago sativa L.) in acidic soils in southern China poses significant challenges, primarily due to two key factors: aluminum (Al) toxicity and phosphorus (P) deficiency. This study aimed to assess the morphological and physiological responses of alfalfa roots under conditions of Al stress and P limitation. Methods A pot experiment was conducted to compare the growth and root characteristics of an Al stress-sensitive cultivar (Longzhong) and an Al stress-tolerant cultivar (Trifecta) of alfalfa in acidic soil. This was achieved by supplying six P levels (0, 10, 20, 40, 80, and 120 mg P kg-1 soil) and utilizing two soil types: limestone (pH=6.01) and yellow soil (pH=5.46), both with high soil exchangeable Al concentration (Limestone soil 397 mg/kg, yellow soil 832 mg/kg). Results Phosphorus supply alleviated Al toxicity and enhanced plant growth, but aboveground growth did not further increase when the P supply exceeded 40 mg P kg-1 soil. Trifecta exhibited higher P uptake and P utilisation efficiency, along with increased total root length, compared to Longzhong. Both alfalfa cultivars allocated more biomass to the roots to maximize P extraction from the soil. Conclusions The superior root morphological traits observed in Al-tolerant alfalfa are responsible for enhanced P uptake and biomass production in acidic soil conditions. However, excessive P application leads to a significant decline in soil pH, increased levels of exchangeable Al content in the soil, and ultimately inhibits plant growth.

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Soil-released carbon dioxide from microbial biomass carbon in the cultivated soils of karst areas of southwest China

Cited by 27 publications

References 19 publications

Microbial assimilation of plant-derived carbon in soil traced by isotope analysis

Microbial assimilation of plant-derived carbon in soil traced by isotope analysis

Field measurements of the CO2 evolution rate under different crops during an irrigation cycle in a mountain oasis of Oman

RETRACTED: Unveilling the impact of phosphorus availability on growth, root morphological and physiological traits of alfalfa (Medicago sativa L.) with contrasting aluminum tolerance in acidic soils

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