pH buffering capacity of acid soils from tropical and subtropical regions of China as influenced by incorporation of crop straw biochars

Xu, Ren-kou; Zhao, Aiwu; Yuan, Junfei; Jiang, Jun

doi:10.1007/s11368-012-0483-3

Cited by 267 publications

(149 citation statements)

References 29 publications

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“…Our results showed that BS was typically less than 8% along all soil profiles, which was greatly lower than other sites in tropical zones with low atmospheric N deposition (Krusche et al, 2003;Xu et al, 2012). Research on soil acidification in southern China and SE Asia suggested that 20% of BS could be used as a threshold for estimating acidification damage (Hicks et al, 2008).…”

Section: +mentioning

confidence: 55%

Nitrogen deposition contributes to soil acidification in tropical ecosystems

Mao

Gilliam

et al. 2014

Global Change Biology

441

225

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Elevated anthropogenic nitrogen (N) deposition has greatly altered terrestrial ecosystem functioning, threatening ecosystem health via acidification and eutrophication in temperate and boreal forests across the northern hemisphere. However, response of forest soil acidification to N deposition has been less studied in humid tropics compared to other forest types. This study was designed to explore impacts of long-term N deposition on soil acidification processes in tropical forests. We have established a long-term N deposition . We measured soil acidification status and element leaching in soil drainage solution after 6-year N addition.Results showed that our study site has been experiencing serious soil acidification and was quite acid-sensitive showing high acidification (pH (H2O) <4.0), negative water-extracted acid neutralizing capacity (ANC) and low base saturation (BS,< 8%) throughout soil profiles.Long-term N addition significantly accelerated soil acidification, leading to depleted base cations and decreased BS, and further lowered ANC. However, N addition did not alter Accepted ArticleThis article is protected by copyright. All rights reserved.

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Section: +mentioning

confidence: 55%

Nitrogen deposition contributes to soil acidification in tropical ecosystems

Mao

Gilliam

et al. 2014

Global Change Biology

441

225

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“…46 Relative to 2:1 clay minerals, 1:1 kaolinite makes a minor contribution to soil CEC and leads to lower soil pH buffering capacity. 47 The continued weathering process will lead to Al 3+ release from 1:1 minerals and subsequent dominance in soil. Furthermore, hydrolysis of Al 3+ can result in release of H + to soil solution, constantly lowering its pH.…”

Section: Characteristics Of Soil Buffering Capacity In Tropicalmentioning

confidence: 99%

“…63 Studying in the tropical and subtropical regions of China, Xu et al found that soil pH buffering capacity was positively related to the contents of soil organic matter and soil CEC, and suggested that protonation/deprotonation was the main mechanism for organic matter contribution to soil pH buffering capacity. 47 The greater CEC indicates that soil can provide more cation exchange sites to take up H + and to buffer input of acid to soils. Commonly, low CEC soils are more likely to develop base cation (such as Ca 2+ and Mg 2+ ) deficiencies, whereas high CEC soils are less susceptible to leaching losses of these cations.…”

Section: Characteristics Of Soil Buffering Capacity In Tropicalmentioning

confidence: 99%

Divergent Responses of Soil Buffering Capacity to Long-Term N Deposition in Three Typical Tropical Forests with Different Land-Use History

Mao

et al. 2015

Environ. Sci. Technol.

112

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Elevated anthropogenic nitrogen (N) deposition has become an important driver of soil acidification at both regional and global scales. It remains unclear, however, how long-term N deposition affects soil buffering capacity in tropical forest ecosystems and in ecosystems of contrasting land-use history. Here, we expand on a long-term N deposition experiment in three tropical forests that vary in land-use history (primary, secondary, and planted forests) in Southern China, with N addition as NH 4 NO 3 of 0, 50, 100, and 150 kg N ha −1 yr −1 , respectively. Results showed that all three forests were acid-sensitive ecosystems with poor soil buffering capacity, while the primary forest had higher base saturation and cation exchange capacity than others. However, long-term N addition significantly accelerated soil acidification and decreased soil buffering capacity in the primary forest, but not in the degraded secondary and planted forests. We suggest that ecosystem N status, influenced by different land-use history, is primarily responsible for these divergent responses. N-rich primary forests may be more sensitive to external N inputs than others with low N status, and should be given more attention under global changes in the future, because lack of nutrient cations is irreversible.

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“…4a) were: 3.04, 2.95, and 2.66 respectively for 40 M, 10 M30B, and control gnocchi samples. Buffering capacity indicates the ability of food to resist changes in pH (Xu et al 2012). The highest pH in the 40M gnocchi sample may be attributed to inorganic phosphate, proteinbound L-histidine residues, free L-histidine or histidine-related dipeptides in meat that played a key role in buffering (Culbertson et al 2010).…”

Section: Sensory Characteristicsmentioning

confidence: 99%

Physicochemical and sensory characterization of gnocchi and the effects of novel formulation on in vitro digestibility

et al. 2016

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Conventional gnocchi are small Italian dumplings made from potatoes, flour, and eggs. In this study, a range of gnocchi-type products containing navy bean and beef meat (10-40% w/w) were developed. The nutritional, physicochemical and sensory properties of the formulated gnocchi were determined, and a Modified in vitro Stomach Stir Tank (MISST) system was used to determine in vitro digestibility. Adding meat significantly increased the fat and protein content of cooked gnocchi type products compared to the control sample. Addition of navy bean and meat also significantly increased hardness, springiness, and chewiness, of most gnocchi type products compared to control sample. In vitro studies showed that pH increased faster in samples high in meat and navy bean content during the initial 30 min to control. The addition of high levels of meat emulsion and navy bean increased, springiness, beany, and meaty flavour. Gnocchi with 20% meat emulsion was similar to control upto some extent being characterized to have flocculent, soft, chewy, and wheaty in flavour. The addition of meat and navy bean did not affect the digestibility of starch in the gastrointestinal tract. Fortified gnocchi with meat and bean was showed a promising vehicle to deliver nutritive values without any changes in starch digestibility.

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pH buffering capacity of acid soils from tropical and subtropical regions of China as influenced by incorporation of crop straw biochars

Cited by 267 publications

References 29 publications

Nitrogen deposition contributes to soil acidification in tropical ecosystems

Nitrogen deposition contributes to soil acidification in tropical ecosystems

Divergent Responses of Soil Buffering Capacity to Long-Term N Deposition in Three Typical Tropical Forests with Different Land-Use History

Physicochemical and sensory characterization of gnocchi and the effects of novel formulation on in vitro digestibility

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