Global soil acidification impacts on belowground processes

Meng, Cheng; Tian, Dashuan; Zeng, Hui; Li, Zhaolei; Yi, Chuixiang; Niu, Shuli

doi:10.1088/1748-9326/ab239c

Cited by 151 publications

(91 citation statements)

References 60 publications

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“…Similarly, previous studies have reported that productivity declines were observed in long-term monoculture Chinese r plantations [15,18]. The CP soil suppressed growth and leaf photosynthesis, as shown in other studies [19], which might be due to three reasons: depletion of nutrient elements, soil acidi cation and imbalance of soil microbes [14,20,21]. Generally, soil degradation in the continuous cropping system of our study appeared to be less serious than expected based on previous reports.…”

Section: Discussionsupporting

confidence: 85%

Drought stress introduces growth, physiological traits and ecological stoichiometry changes in two contrasting Cunninghamia lanceolata cultivars planted in continuous-plantation soils

Bian

Wang

Duan

et al. 2021

Preprint

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Background: The decrease of Cunninghamia lanceolata (Lamb.) production on continually planted soil is an essential problem. In this study, two cultivars (a normal cultivar, NC, and a super cultivar, SC) with two-year-old seedlings were grown in two types of soil (non-planting of Chinese fir, NP soil; continuous planting of Chinese fir, CP soil) with three watering regimes, and the interaction effects on plant growth and physiological traits were investigated. Results: The water contents of normal water control (CK), medium water content (MWC) and low water content (LWC) soil reached 75%-80%, 45%-50% and 20%-25%, respectively, of the field water capacity. The results indicated that both CP soil and LWC soil had negative effects on growth and physiological traits. In both cultivars, CP soil significantly decreased plant growth and the performance of physiological traits. The LWC soil changed the ecological stoichiometry in the three organs, induced oxidative stress, promoted water use efficiency and damaged chloroplast ultrastructure. Compared with NC, the SC cultivar was more tolerant to CP soil and drought stress. Conclusions: The CP soil shows negative effect on C. lanceolata’s physiological traits, and these effects can be exacerbated by drought stress. Therefore, the utilization of continuous planted soil can cultivate improved varieties of C. lanceolata and maintain water capacity. This can improve their growth and physiological performance to a certain extent.

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Section: Discussionsupporting

confidence: 85%

Drought stress introduces growth, physiological traits and ecological stoichiometry changes in two contrasting Cunninghamia lanceolata cultivars planted in continuous-plantation soils

Bian

Wang

Duan

et al. 2021

Preprint

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“…Root biomass and R:S generally increases with soil alkalinity (Figure 3,Supplementary Figures 11,12,13). Low pH is toxic to biological activities and roots, especially as fine roots are sensitive to soil acidification, as revealed by a recent meta-analysis (Cheng Meng et al, 2019). Our results also indicate overall positive correlations between CEC, BS and R:S, but the processes that may account for these correlations are less clear from literature.…”

supporting

confidence: 64%

A global map of root biomass across the world's forests

Huang¹,

Ciais²,

Santoro³

et al. 2021

Preprint

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Abstract. As a key component of the Earth system, root plays the key role in linking Earth's lithosphere, hydrosphere, biosphere, and atmosphere. Here we combine 10307 field measurements of forest root biomass worldwide with global observations of forest structure, climatic conditions, topography, land management and soil characteristics to derive a spatially explicit global high-resolution (~1 km) root biomass dataset, including fine and coarse roots. In total, 142 ± 25 (95 % CI) Pg of live dry matter biomass is stored below-ground, representing a global average root:shoot biomass ratio of 0.25 ± 0.10. Our estimations of total root biomass in tropical, temperate and boreal forests are 44–226 % smaller than earlier studies (Jackson et al., 1997; Robinson, 2007; Saugier et al., 2001). The smaller estimation is attributable to the updated forest area, spatially explicit above-ground biomass density used to predict the patterns of root biomass, new root measurements and upscaling methodology. We show specifically that the root shoot allometry is one underlying driver that leads to methodological overestimation of root biomass in previous estimations. Raw datasets and global maps generated in this study are deposited at the open access repository Figshare (https://figshare.com/articles/Supporting_data_and_code_for_A_global_map_of_root_biomass_across_the_world_s_forests/ 12199637).

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“…Dai et al (2017) point out that approximately 50% of the world's arable soils are acidic, with areas further increasing in recent years. It is well known that acid soils can alter soil carbon (C) and nutrient cycling and adversely influence the growth of plant and soil biota, and threaten terrestrial ecosystem functions (e.g., net primary production and species richness; Meng et al, 2019;Stevens et al, 2010;Yang et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Potential benefits of liming to acid soils on climate change mitigation and food security

Wang

Yao

Yang

et al. 2021

Global Change Biology

103

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Globally, about 50% of all arable soils are classified as acidic. As crop and plant growth are significantly hampered under acidic soil conditions, many farmers, but increasingly as well forest managers, apply lime to raise the soil pH. Besides its direct effect on soil pH, liming also affects soil C and nutrient cycles and associated greenhouse gas (GHG) fluxes. In this meta-analysis, we reviewed 1570 observations reported in 121 field-based studies worldwide, to assess liming effects on soil GHG fluxes and plant productivity. We found that liming significantly increases crop yield by 36.3%. Also, soil organic C (SOC) stocks were found to increase by 4.51% annually, though soil respiration is stimulated too (7.57%). Moreover, liming was found to reduce soil N 2 O emission by 21.3%, yield-scaled N 2 O emission by 21.5%, and CH 4 emission and yieldscaled CH 4 emission from rice paddies by 19.0% and 12.4%, respectively. Assuming that all acid agricultural soils are limed periodically, liming results in a total GHG balance benefit of 633−749 Tg CO 2 -eq year −1 due to reductions in soil N 2 O emissions (0.60−0.67 Tg N 2 O-N year −1 ) and paddy soil CH 4 emissions (1.75−2.21 Tg CH 4 year −1 ) and increases in SOC stocks (65.7-110 Tg C year −1 ). However, this comes at the cost of an additional CO 2 release (c. 624-656 Tg CO 2 year −1 ) deriving from lime mining, transport and application, and lime dissolution, so that the overall GHG balance is likely neutral. Nevertheless, liming of acid agricultural soils will increase yields by at least 6.64 × 10 8 Mg year −1 , covering the food supply of 876 million people. Overall, our study shows for the first time that a general strategy of liming of acid agricultural soils is likely to result in an increasing sustainability of global agricultural production, indicating the potential benefit of liming acid soils for climate change mitigation and food security.

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Global soil acidification impacts on belowground processes

Cited by 151 publications

References 60 publications

Drought stress introduces growth, physiological traits and ecological stoichiometry changes in two contrasting Cunninghamia lanceolata cultivars planted in continuous-plantation soils

Drought stress introduces growth, physiological traits and ecological stoichiometry changes in two contrasting Cunninghamia lanceolata cultivars planted in continuous-plantation soils

A global map of root biomass across the world's forests

Potential benefits of liming to acid soils on climate change mitigation and food security

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