Depth-wise distribution of soil-carbon stock in aggregate-sized fractions under shaded-perennial agroforestry systems in the Western Ghats of Karnataka, India

Chatterjee, Nilovna; Nair, P. K. R.; Nair, Vimala D.; Viswanath, S.; Bhattacharjee, Abhishek

doi:10.1007/s10457-019-00399-z

Cited by 19 publications

(10 citation statements)

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“…The amount of SOC stock at any depth class was not influenced by land use system (treatments) but was influenced by soil fraction size class. The influence of soil fraction size class on SOC stocks have been reported previously in coherence to our findings in other agroforestry systems such as Silvopastoral systems in Brazil and USA, shaded cocoa AFS in Brazil, Dehesa systems in Spain, shaded coffee AFS and, Homegardens in India [17,27,28,36,37,39]. The effect of fraction size class was significantly different at different depth classes.…”

Section: Land-use System-soil Depth Class-aggregate Size Interactions In Soc Storage Under Shaded Afssupporting

confidence: 91%

“…Total SOC stock decreased with soil depth in all land-use systems (Figure 3), in coherence to other reported results from different coffee growing regions in Uganda, Togo, Peru, Mexico and India [17,40,42,[44][45][46][47]. All these studies have reported varied ranges of SOC stocks within coffee AFS.…”

Section: Soc Stocks In Whole Soilsupporting

confidence: 88%

“…All statistical tests were performed using R studio [31]. In order to understand the effect of textural variability (silt and clay content) within treatments on SOC stocks, we ran linear regressions in similar way, as stated in a similar study conducted in India [17], independently across all depth classes as per the following equation:…”

Section: Statistical Analysesmentioning

confidence: 99%

“…are cultivated under the shade of tall-growing plants. Several studies have pointed out that shaded perennial systems often "mimic" a forest-like environment and have very high soil carbon storage potential (≈150 Mg C ha −1 ) [14][15][16][17]. A global meta-analysis reported 48% higher SOC stocks under shaded perennial agroforests when compared to monoculture systems [18].…”

Section: Introductionmentioning

confidence: 99%

“…The macroaggregates are more sensitive to changes in soil management practices and organic inputs compared to microaggregates and silt-and-clay particles. Given the importance of size fractions in SOC storage, several studies on the potential of C sequestration in soils under AFS have emphasized the importance of determining the extent of C storage in different aggregate classes at deeper soil depths, up to 1-m [17,[26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

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Do Coffee Agroforestry Systems Always Improve Soil Carbon Stocks Deeper in the Soil?—A Case Study from Turrialba, Costa Rica

Chatterjee

Nair

et al. 2019

Forests

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Shaded perennial agroforestry systems (AFS) are regarded as desirable land-use practices that improve soil carbon sequestration. However, most studies assume a positive correlation between above ground and below ground carbon without considering the effect of past and current land management, textural variations (silt and clay percentage), and such other site-specific factors that have a major influence on the extent of soil C sequestration. We assessed SOC stock at various depths (0–10, 10–30, 30–60, and 60–100 cm) in shaded perennial coffee (Coffea arabica L.) AFS in a 17-year-old experimental field at the Centro Agronómico Tropical de Investigación y Enseñanza, (9°53′44′′ N, 83°40′7′′ W; soil type: Ultisols and Inceptisols, Turrialba, Costa Rica. The treatments included coffee (Coffea arabica L.) grown conventionally (with chemical fertilizers) and organically (without chemical fertilizers) under two shade trees, Erythrina poeppigiana (Walp.) O.F. Cook., and Terminalia Amazonia J.F.Gmel., Sun Coffee (Coffea arabica L.) (Sole stand of coffee without shade), and Native Forest. Three replicated composite soil samples were collected from each system for each depth class, and SOC stocks in three soil aggregate fractions (2000–250 µm, 250–53 µm, and <53 µm) and in the whole soil determined. The total SOC stocks were highest under forest (146.6 Mg C ha−1) and lowest under sun coffee (92.5 Mg C ha−1). No significant differences were noted in SOC stock within coffee AFS and sun coffee across fraction sizes and depth classes. Organic management of coffee under heavily pruned E. poeppigiana, with pruned litter returned to soil, increased SOC stocks for 0–10 cm depth soil only. High input of organic materials including pruned litter did not improve SOC stocks in deeper soil, whereas variations in silt and clay percentages had a significant effect on SOC stocks. The study suggests that high amounts of aboveground biomass alone are not a good indicator of increased SOC storage in AFS, particularly for soils of sites with historical characteristics and management similar to this study.

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