Methods for Assessing the Effects of Land Use Changes on Carbon Stocks of Subtropical Oxisols

Toledo, Diana Marcela; Galantini, Juán Alberto; Dalurzo, Humberto Carlos; Vázquez, Sara; Bollero, Germán A.

doi:10.2136/sssaj2013.03.0087

Cited by 15 publications

(11 citation statements)

References 32 publications

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“…This is in line with the recommendations of Toledo et al. (), who characterized the impact of land‐use change on SOC stocks in Oxisols under humid subtropical climate conditions.…”

Section: Discussionsupporting

confidence: 91%

“…Consequently, the smaller variability characterized by smaller standard deviations improves the detection of statistically significant differences. This is in line with the recommendations of Toledo et al (2013), who characterized the impact of land-use change on SOC stocks in Oxisols under humid subtropical climate conditions.…”

Section: Effects Of Sampling Schemes On the Analysis Of Soc Stockssupporting

confidence: 91%

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Impact of land use on soil organic carbon stocks in the humid tropics of NE Tanzania

Kirsten

Kimaro

Feger

et al. 2019

J. Plant Nutr. Soil Sci.

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The conversion of tropical forests to agricultural land use is considered as a major cause for a decline in soil organic carbon (SOC) stocks. However, the extent and impact of different land uses on SOC stock development is highly uncertain, especially for tropical Africa due to a lack of reliable data. Interactions of SOC with the soil mineral phase can modify the susceptibility of SOC to become mineralized. Pedogenic Fe‐, Al‐oxides and clay potentially affect SOC stabilization in highly weathered soils typically found in the humid tropics. The aim of our study was to determine the impact of different land uses on SOC stock on such soils. For that purpose, 10 pedologically similar, deeply weathered acidic soils (Acrisols, Alisols) in the Eastern Usambara Mountains (Amani Nature Reserve, NE Tanzania) under contrasting land use were sampled to a depth of 100 cm. The calculated mean SOC stocks were 17.5 kg C m−2, 16.8 kg C m−2, 16.9 kg C m−2, and 20.0 kg C m−2 for the four forests, two tea plantations, three croplands, and one homegarden, respectively. A significant difference in mean SOC stock of 1.3 kg C m−2 was detected between forest and cropland land use for the 0–10 cm depth increment. No further significant impacts of land use on SOC stocks were observed. All soils have a clearly clay‐dominated texture. They are characterized by high content of pedogenic oxides with 29 to 47 g kg−1 measured for the topsoils and 36 to 65 g kg−1 for the subsoils. No positive significant relationship was found between SOC and clay content. Statistically significant positive relationships existed between oxalate‐extractable Fe, Al, and SOC content for cropland soils only. Compared to data published in literature the SOC stocks determined in our study were generally high independent of the established land use. It appears that efficient SOC stabilization mechanisms are counteracting the higher disturbance regime under agricultural land use in these highly weathered tropical soils.

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“…This is in line with the recommendations of Toledo et al. (), who characterized the impact of land‐use change on SOC stocks in Oxisols under humid subtropical climate conditions.…”

Section: Discussionsupporting

confidence: 91%

Section: Effects Of Sampling Schemes On the Analysis Of Soc Stockssupporting

confidence: 91%

Impact of land use on soil organic carbon stocks in the humid tropics of NE Tanzania

Kirsten

Kimaro

Feger

et al. 2019

J. Plant Nutr. Soil Sci.

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“…This variation in SOC concentration may be related to changes in the quantity and distribution of annual precipitation (Galantini and Rosell, 2006) and/or to changes in soil bulk density along the study period (Ellert and Bettany, 1995;Toledo et al, 2013;Wang et al, 2009). Total SOC changed from 1.5% to 0.89% (WW-CT nf) and from 1.5% to 1.03% (WW-CT f).…”

Section: Long-term Effects Of Ww-ct On Soc Stockmentioning

confidence: 99%

“…To avoid the effect of soil bulk density on the estimated SOC storage, all values were calculated as SOC content (Mg ha −1 ) on an equivalent soil mass basis (2,400 Mg ha −1 ) using the method outlined by Toledo et al (2013).…”

Section: Physical Chemical and Spectrometric Determinationsmentioning

confidence: 99%

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Continuous Wheat in Semiarid Regions

et al. 2014

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Continuous wheat (Triticum aestivum L.) cropping in semiarid regions results in variable dry matter production. As a consequence, the balance of soil organic carbon (SOC) may vary across time. The aim of this research was to assess the dynamics and long-term changes of physically and chemically extracted SOC fractions. Soil samples (0-to 5-, 5-to 10-, and 10-to 20-cm depths) from continuous wheat with (f) and without (nf) fertilizer (N + P) under conventional tillage ((CT) for 25 years) and no-tillage ((NT) for 6 years) were taken during the experiment. Mineralassociated ((MOC) 0-0.053 mm), fine particulate ((POC f ) 0.053-0.100 mm), and coarse particulate ((POC c ) 0.1-2.0 mm) SOC and humic substances were obtained. The SOC variability depended on water availability during fallow periods (SOC decomposition) or crop cycles (dry matter production). The mean wheat yields were 1.33 (nf) and 2.09 (f) Mg grain ha −1 , with an estimated carbon input of 1.64 (nf) and 2.20 (f) Mg C ha −1 year −1 . Losses from the initial level were higher in labile fractions, POC c (−75%) and POC f (−53%), than in MOC (−15%). Humic acids present slight differences in their structure and quantity as a result of long-term cropping. Conversion from CT to NT resulted in contrasting results. For an equivalent soil mass, fertilizer application increased SOC by 4.31 Mg ha −1 (under CT) and 7.29 Mg ha −1 (under NT). The SOC turned out to be higher under NT with fertilizer use and lower without application. No-tillage does not increase SOC content by itself; it must be combined with other agricultural practices such as fertilization and/or crop rotation.Values within each column followed by different letters are significantly different according to the LSD test (P < 0.05).Galantini et al.

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The impact of land use and cover change on soil organic carbon and total nitrogen storage in the Heihe River Basin: A meta-analysis

Zheng

Sun

et al. 2019

J. Geogr. Sci.

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Land use and cover change (LUCC) is an important indicator of the human-earth system under climate/environmental change, which also serves as a key impact factor of carbon balance, and a major source/sink of soil carbon cycles. The Heihe River Basin (HRB) is known as a typical ecologically fragile area in the arid/semi-arid regions of northwestern China, which makes it more sensitive to the LUCC. However, its sensitivity varies in a broad range of controlling factors, such as soil layers, LUCCs and calculation methods (e.g. the fixed depth method, FD, and the equivalent mass method, ESM). In this study, we performed a meta-analysis to assess the response of soil organic carbon (SOC) and total nitrogen (TN) storage to the LUCC as well as method bias based on 383 sets of SOC data and 148 sets of TN data from the HRB. We first evaluated the calculation methods and found that based on the FD method, the LUCC caused SOC and TN storage to decrease by 17.39% and 14.27%, respectively; while the losses estimated using the ESM method were 19.31% and 18.52%, respectively. The deviations between two methods were mainly due to the fact that the FD method ignores the heterogeneity of soil bulk density (BD), which may underestimate the results subsequently. We then analyzed the response of SOC and TN storage to various types of the LUCC. In particular, when woodland and grassland were converted into cultivated land or other land types, SOC and TN suffered from heavy losses, while other LUCCs had minor influences. Finally, we showed that increasing the depth of the soil layers would reduce the losses of SOC and TN storage. In summary, we identified a series of controlling factors (e.g. soil layer, the LUCC and calculation method) to evaluate the impact of the LUCC on SOC and TN storage in the HRB, which should be considered in future research.

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Methods for Assessing the Effects of Land Use Changes on Carbon Stocks of Subtropical Oxisols

Cited by 15 publications

References 32 publications

Impact of land use on soil organic carbon stocks in the humid tropics of NE Tanzania

Impact of land use on soil organic carbon stocks in the humid tropics of NE Tanzania

Continuous Wheat in Semiarid Regions

The impact of land use and cover change on soil organic carbon and total nitrogen storage in the Heihe River Basin: A meta-analysis

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