Effects of land use change on organic carbon dynamics associated with soil aggregate fractions on the Loess Plateau, China

Zhong, Zekun; Han, Xinhui; Xu, Yadong; Zhang, Wei; Fu, Shuyue; Liu, Weichao; Ren, Chao; Yang, Gaihe; Ren, Guangxin

doi:10.1002/ldr.3294

Cited by 103 publications

(62 citation statements)

References 62 publications

(137 reference statements)

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“…First, there was 1.2-1.5-fold increase in SOC and TN concentrations in aggregates and non-aggregate fractions in broadleaved forests as compared to those in coniferous forests (Figure 4). Changes to SOC and TN concentrations in soil fractions have been found to result from several soil disturbances such as, tillage (Six et al, 2000;Six, Elliott, & Paustian, 1999), fertilization (Chen et al, 2010), and land-use change (Zhong et al, 2019). Usually, soil aggregate fractions, including macroaggregates and microaggregates, are the fractions that exhibit increases in SOC and TN concentrations (Deng et al, 2018;Wei, Li, Jia, & Shao, 2012).…”

Section: Stronger Aggregates Protection Increased In Broadleaved Fomentioning

confidence: 99%

“…In this study, the increases in SOC and TN concentrations exhibited similar magnitudes for all three fractions (Figure 4). Zhong et al, 2019). Therefore, broadleaved forest soils provide stronger physical protection for SOC and TN from microbial attack and oxidization-related mineralization than coniferous forests (Blanco-Canqui & Lal, 2004;Rabbi, Wilson, Lockwood, Daniel, & Young, 2014).…”

Section: Stronger Aggregates Protection Increased In Broadleaved Fomentioning

confidence: 99%

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Soil aggregation accounts for the mineral soil organic carbon and nitrogen accrual in broadleaved forests as compared to that of coniferous forests in Northeast China: Cross‐sites and multiple species comparisons

et al. 2020

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Differences in soil organic carbon (SOC) and total nitrogen (TN) between broadleaved and coniferous forests are not well-defined, hindering the evaluation of the influence of forest-type on land degradation and development. For these two foresttypes, we determined differences in soil aggregation, SOC, and TN by comparing 202 plots at six sites with 14 common afforestation tree species. Bulk soil was separated to macroaggregates (0.25-2 mm), microaggregates (0.053-0.25 mm), and silt and clay fractions (<0.053 mm). Inter-site variations were excluded by MANOVA (multiple analysis of variance) and MANCOVA (multiple analysis of covariance). Broadleaved forests exhibited 30-50% higher SOC and TN in bulk soils than that of coniferous forests, and aggregates contributed to 75-77% of the SOC and TN accrual. The high accrual was a result of SOC and TN concentration increases in aggregates (30-50%), macroaggregates fraction increases (50%, with a 14% decrease in the non-aggregate fractions), aggregates diameter increases (one-third), and non-significant differences in C/N. Uncertainty tests showed a low bias (4.2%), and the accrual of SOC and TN in broadleaved forests were larger at sites with less clay and at higher altitude and more precipitation and afforested with more fraxinus and less poplar. Our results highlight that SOC and TN accrual in broadleaved forests is mainly due to the stronger aggregates protection, which should be fully considered during precise land evaluation and species selection for afforestation. Future studies identifying the mechanisms underlying these changes should consider interactions among leaf functional traits, aggregation-disaggregation processes, and microbial rhizosphere deposition.

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Section: Stronger Aggregates Protection Increased In Broadleaved Fomentioning

confidence: 99%

Section: Stronger Aggregates Protection Increased In Broadleaved Fomentioning

confidence: 99%

Soil aggregation accounts for the mineral soil organic carbon and nitrogen accrual in broadleaved forests as compared to that of coniferous forests in Northeast China: Cross‐sites and multiple species comparisons

et al. 2020

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“…Therefore, macroaggregates can further bind SOC (especially particulate organic carbon) but have lower stability compared with microaggregates. The formation and destruction of macroaggregates is a critical process influencing SOC dynamics (Six et al, ; Zhong et al, ). The decreases in SOC pools induced by the conversion of wetland to cropland had been widely reported (e.g., Huo et al, ; Wang et al, ).…”

Section: Introductionmentioning

confidence: 99%

Conversion of coastal marshes to croplands decreases organic carbon but increases inorganic carbon in saline soils

et al. 2020

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Over the past century, conversion to agriculture has greatly reduced the global extent of coastal wetlands leading to degradation and loss of these ecosystems.However, it remains unclear how this land conversion affects the confluent soil organic and inorganic carbon (SOC and SIC) storage as well as their localizations in soil matrix. Here, we investigated these issues using wet sieving at two coastal saline-alkali sites in northern China. Conversion of marshes to cropland (>60 years) decreased the portion of large macroaggregates (>2 mm) and correspondingly increased the portion of microaggregates (0.053-0.25 mm) at both sites. Land conversion decreased SOC contents by 31-67% in all fractions (>2, 0.25-2, 0.053-0.25, and <0.053 mm) in the topsoil (0-15 cm) and subsoil (15-30 cm). In contrast, irrigation-and NH 4 HCO 3 fertilization-derived carbonates increased SIC storages in almost all fractions due to the saline-alkali soil conditions, especially for the subsoil.This increases in SIC almost offset and compensate for the SOC losses at both sites.Consequently, the irrigation-and NH 4 HCO 3 -induced SIC accumulation should be included in the full C balance of saline-alkali soils. It should be noted, however, that the progressive loss of SOC due to cultivation will lead to soil degradation in fertility and ecological function, thereby hampering long-term sustainability of coastal ecosystems. Therefore, the compensation of SIC for the loss of SOC is not sustainable in the longer term.

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“…Human‐aided afforestation of degraded or cultivated land is an effective measure to control soil erosion, increase soil carbon sequestration, and recover ecosystems (Deng, Liu, & Shangguan, ; García‐Díaz et al, ). Forest expansions usually result in higher plant biomass and more litter input, which accelerated vegetation restoration, reduced soil degradation, and increased soil carbon (C) and nitrogen (N) sequestration (Laganière, Angers, & Paré, ; Yang, Luo, & Finzi, ; Zhong et al, ). Soil organic carbon (SOC) accumulation depends largely on plant net primary productivity (NPP; Jobbágy & Jackson, ; Liu et al, ), which is mainly limited by N fixation in most terrestrial ecosystems (Averill & Waring, ; Luo et al, ; Vitousek & Howarth, ).…”

Section: Introductionmentioning

confidence: 99%

Effects of plantation age and precipitation gradient on soil carbon and nitrogen changes following afforestation in the Chinese Loess Plateau

Han

Gao

et al. 2019

Land Degrad Dev

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Afforestation of degraded land significantly influences soil organic carbon (SOC) and total nitrogen (STN) sequestration. The interaction effects of plantation age and climate gradient on SOC and STN changes following afforestation are not well understood. In this study, five sites were selected along a precipitation gradient (410–600 mm yr−1) in the Loess Plateau. The SOC and STN stocks at a depth of 0–200 cm were measured in cropland and black locust (Robinia pseudoacacia L.) forests with different plantation ages, that is, young forest (<15 years), middle‐aged forest (15–25 years), and old forest (>25 years). The SOC and STN stocks in the 0‐ to 200‐cm profiles of young forest, middle‐aged forest, and cropland increased significantly with mean annual precipitation (p < .05), whereas the increasing trend of the SOC stocks of old forest was not significant, indicating an age‐dependent change in the SOC and STN stocks across the precipitation gradient. The SOC stock change (∆SOC) following afforestation increased with mean annual precipitation in young forest, but it had a decreasing trend in middle‐aged and old forests. The STN stock changes (∆STN) in the three forests were negative at most sites, and they all decreased along the precipitation gradient. There were significant positive correlations between ∆SOC and ∆STN (p < .01), and 1‐g STN stock accumulation was accompanied by 8.40‐, 6.10‐, and 10.48‐g SOC accumulation for young forest, middle‐aged forest, and old forest, respectively. The different patterns of SOC and STN stock changes should be incorporated into soil C and N modelling and estimation.

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Effects of land use change on organic carbon dynamics associated with soil aggregate fractions on the Loess Plateau, China

Cited by 103 publications

References 62 publications

Soil aggregation accounts for the mineral soil organic carbon and nitrogen accrual in broadleaved forests as compared to that of coniferous forests in Northeast China: Cross‐sites and multiple species comparisons

Soil aggregation accounts for the mineral soil organic carbon and nitrogen accrual in broadleaved forests as compared to that of coniferous forests in Northeast China: Cross‐sites and multiple species comparisons

Conversion of coastal marshes to croplands decreases organic carbon but increases inorganic carbon in saline soils

Effects of plantation age and precipitation gradient on soil carbon and nitrogen changes following afforestation in the Chinese Loess Plateau

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