Dramatic loss of inorganic carbon by nitrogen‐induced soil acidification in Chinese croplands

Global Change Biology, Год журнала: 2020, Номер 26(6), С. 3738 - 3751

Опубликована: Апрель 2, 2020

Intensive crop production systems worldwide, particularly in China, rely heavily on nitrogen (N) fertilization, but left more than 50% of fertilizer N the environment. Nitrogen (over) fertilization and atmospheric deposition induce soil acidification, which is neutralized by inorganic carbon (SIC; carbonates), dioxide (CO2 ) released to atmosphere. For first time, loss SIC stocks response N-induced acidification was estimated for Chinese croplands from 1980 2020 forecasts were made up 2100. The 2.16 Pg C (16.3 Mg C/ha) upper 40 cm, 7% (0.15 C; 1.1 lost 2020. During these years, 7 million ha cropland has become carbonate free. Another 37% may be 2100 leaving 30 (37.8%) without carbonates if follows business-as-usual (BAU) scenario. Compared BAU scenario, reduction input 15%-30% after (scenarios S1 S2) will decrease dissolution 18%-41%. If remains constant as noted (S3) or decreases 1% annually (S4), a 52%-67% expected compared presence CaCO3 important various processes including acidity buffering, aggregate formation stabilization, organic matter microbial enzyme activities, nutrient cycling availability, water permeability plant productivity. Therefore, optimizing improving N-use efficiency are decreasing losses acidification. application should strictly calculated based demand, any overfertilization avoided prevent environmental problems fertility decline associated with losses.

Язык: Английский

---

Long‐term, amplified responses of soil organic carbon to nitrogen addition worldwide

Global Change Biology, Год журнала: 2020, Номер 27(6), С. 1170 - 1180

Опубликована: Дек. 18, 2020

Abstract Soil organic carbon (SOC) is the largest sink in terrestrial ecosystems and plays a critical role mitigating climate change. Increasing reactive nitrogen (N) caused by anthropogenic N input substantially affects SOC dynamics. However, uncertainties remain concerning effects of addition on both mineral soil layers over time at global scale. Here, we analysed large empirical data set spanning 60 years across 369 sites worldwide to explore temporal dynamics addition. We found that significantly increased globe 4.2% (2.7%–5.8%). increases were amplified from short‐ long‐term durations layers. The positive independent ecosystem types, mean annual temperature precipitation. Our findings suggest largely resulted enhanced plant C soils coupled with reduced loss decomposition amplification was associated microbial biomass respiration under study suggests will enhance sequestration contribute future change mitigation.

Язык: Английский

---

Soil GHG fluxes are altered by N deposition: New data indicate lower N stimulation of the N₂O flux and greater stimulation of the calculated C pools

Global Change Biology, Год журнала: 2019, Номер 26(4), С. 2613 - 2629

Опубликована: Дек. 21, 2019

The effects of nitrogen (N) deposition on soil organic carbon (C) and greenhouse gas (GHG) emissions in terrestrial ecosystems are the main drivers affecting GHG budgets under global climate change. Although many studies have been conducted this topic, we still little understanding how N affects C pools at scale. We synthesized a comprehensive dataset 275 sites from multiple around world quantified responses pool fluxes induced by enrichment. results showed that concentration CO2 , CH4 N2 O increased an average 3.7%, 0.3%, 24.3% 91.3% enrichment, respectively, uptake decreased 6.0%. Furthermore, percentage increase (91.3%) was two times lower than (215%) reported Liu Greaver (Ecology Letters, 2009, 12:1103-1117). There also greater stimulation (15.70 kg ha-1 year-1 per ) previously globally. croplands were largest sources (calculated as equivalents), followed wetlands. However, forests grasslands important sinks. Globally, sink 6.34 Pg /year. It net 10.20 -Geq (CO2 equivalents)/year. Therefore, not only size but emissions, calculated warming potential approach.

Язык: Английский

---

Global effects on soil respiration and its temperature sensitivity depend on nitrogen addition rate

Soil Biology and Biochemistry, Год журнала: 2022, Номер 174, С. 108814 - 108814

Опубликована: Сен. 1, 2022

Язык: Английский

---

Shifts in C-degradation genes and microbial metabolic activity with vegetation types affected the surface soil organic carbon pool

Soil Biology and Biochemistry, Год журнала: 2024, Номер 192, С. 109371 - 109371

Опубликована: Фев. 28, 2024

Язык: Английский

---

Nitrogen deposition-induced stimulation of soil heterotrophic respiration is counteracted by biochar in a subtropical forest

Agricultural and Forest Meteorology, Год журнала: 2024, Номер 349, С. 109940 - 109940

Опубликована: Фев. 27, 2024

Язык: Английский

---

Microbial life‐history strategies mediate microbial carbon pump efficacy in response to N management depending on stoichiometry of microbial demand

Global Change Biology, Год журнала: 2024, Номер 30(5)

Опубликована: Май 1, 2024

The soil microbial carbon pump (MCP) is increasingly acknowledged as being directly linked to organic (SOC) accumulation and stability. Given the close coupling of (C) nitrogen (N) cycles constraints imposed by their stoichiometry on growth, N addition might affect growth strategies with potential consequences for necromass formation However, this topic remains largely unexplored. Based two multi-level fertilizer experiments over 10 years in soils contrasting fertility located North (Cambisol, carbon-poor) Southwest (Luvisol, carbon-rich), we hypothesized that different resource demands microorganism elicit a trade-off (Y-strategy) resource-acquisition (A-strategy) response addition, consequently We combined measurements metrics (MCP efficacy) stability (chemical composition mineral associated carbon) changes life history (assessed via metagenomes enzymatic activity analyses). contribution SOC decreased Cambisol, but increased Luvisol. Soil displayed distinct responses after amendment: shift toward A-strategy (Cambisol) or Y-strategy (Luvisol). These divergent are owing stoichiometric imbalance between availability C N, which presented very patterns soils. partial correlation analysis further confirmed high aggravated demand, shifting community strategy reduced Cambisol. In contrast, had positive direct effect MCP efficacy Luvisol, greatly enhanced Such findings provide mechanistic insights into regulation efficacy, how mediated site-specific trade-offs strategies, contribute improving our comprehension sequestration optimization agricultural management.

Язык: Английский

---

Soil organic matter, nitrogen and pH driven change in bacterial community following forest conversion

Forest Ecology and Management, Год журнала: 2020, Номер 477, С. 118473 - 118473

Опубликована: Авг. 11, 2020

Язык: Английский

---

Metagenomic insights into nitrogen and phosphorus cycling at the soil aggregate scale driven by organic material amendments

The Science of The Total Environment, Год журнала: 2021, Номер 785, С. 147329 - 147329

Опубликована: Апрель 24, 2021

Язык: Английский

---

Manure application increases microbiome complexity in soil aggregate fractions: Results of an 18-year field experiment

Agriculture Ecosystems & Environment, Год журнала: 2020, Номер 307, С. 107249 - 107249

Опубликована: Ноя. 20, 2020

Язык: Английский

---