Variations and influencing factors of nitrate accumulation in the deep soil profiles of apple orchards on the Loess Plateau

Zhu, Xueqiang; Wang, Peizhou; Zhang, Saifeng; Chen, Zhujun; Zhou, Jianbin

doi:10.1016/j.agee.2022.108005

Cited by 22 publications

(2 citation statements)

References 40 publications

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“…This, in turn, enhances the chemodiversity of root exudates and augments the supply of diverse organic matter. Thus, the microbial necromass increased as evidenced by two recent studies published after our literature search (Zhao et al., 2023; Zhu, Yang, et al., 2024). In contrast, measures focusing on temporal diversification, such as crop rotation and cover crops, may not yield an equivalent abundance of these resources for microbes.…”

Section: Resultssupporting

confidence: 58%

Global synthesis on the response of soil microbial necromass carbon to climate‐smart agriculture

Li,

Wang,

Yang

et al. 2024

Global Change Biology

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Climate‐smart agriculture (CSA) supports the sustainability of crop production and food security, and benefiting soil carbon storage. Despite the critical importance of microorganisms in the carbon cycle, systematic investigations on the influence of CSA on soil microbial necromass carbon and its driving factors are still limited. We evaluated 472 observations from 73 peer‐reviewed articles to show that, compared to conventional practice, CSA generally increased soil microbial necromass carbon concentrations by 18.24%. These benefits to soil microbial necromass carbon, as assessed by amino sugar biomarkers, are complex and influenced by a variety of soil, climatic, spatial, and biological factors. Changes in living microbial biomass are the most significant predictor of total, fungal, and bacterial necromass carbon affected by CSA; in 61.9%–67.3% of paired observations, the CSA measures simultaneously increased living microbial biomass and microbial necromass carbon. Land restoration and nutrient management therein largely promoted microbial necromass carbon storage, while cover crop has a minor effect. Additionally, the effects were directly influenced by elevation and mean annual temperature, and indirectly by soil texture and initial organic carbon content. In the optimal scenario, the potential global carbon accrual rate of CSA through microbial necromass is approximately 980 Mt C year−1, assuming organic amendment is included following conservation tillage and appropriate land restoration. In conclusion, our study suggests that increasing soil microbial necromass carbon through CSA provides a vital way of mitigating carbon loss. This emphasizes the invisible yet significant influence of soil microbial anabolic activity on global carbon dynamics.

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Section: Resultssupporting

confidence: 58%

Global synthesis on the response of soil microbial necromass carbon to climate‐smart agriculture

Li,

Wang,

Yang

et al. 2024

Global Change Biology

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“…In this study, it was observed that all soluble salt ions accumulated in the shallow layer throughout all stages, except for K + and NO 3 − at the end of the elongation stage (Figure 4). As NO 3 − is negatively charged, it is not easily absorbed by soil colloids and migrates to the deep layer under the drive of irrigation [72,73]. In contrast, K + and NO 3 − , which have opposite charges, have a synergistic effect; thus, the active absorption of NO 3 − by plants can promote the absorption of K + [74].…”

Section: Effects Of Nitrogen Application On Soil Saline-alkali Proper...mentioning

confidence: 99%

Soil Nutrient, Salinity, and Alkalinity Responses of Dendrocalamopsis oldhami in High-Latitude Greenhouses Depending on Planting Year and Nitrogen Application

Yin

Zhou

et al. 2023

Forests

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This study explored the viability of greenhouse cultivation of Dendrocalamopsis oldhami under the “South Bamboo North Transplanting” initiative. In this study, the effects of planting year and nitrogen application on changes in soil nutrient levels, salinity, and alkalinity over the plant growth period were explored. After the introduction and planting of bamboo in 2017, a soil layer with a thickness of 0–40 cm was sampled at the end of the shooting stage in the greenhouse between 2017 and 2019 (late August), and the bamboo shoot yield and standing culm density were measured. Following the application of nitrogen to the bamboo groves in 2019, three nitrogen levels were established: no nitrogen (N1:0 g grove−1), medium nitrogen (N2:540 g grove−1), and high nitrogen (N3:1080 g grove−1). Soil layers at depths of 0–20 and 20–40 cm were sampled during the shoot elongation stage (late May) and at the end of the shooting stage (late August). The yield and nutrient content of bamboo shoots under different nitrogen treatments were also investigated. The results showed that Ca2+ and HCO3− were the main salt ions in greenhouse soil. With later planting years, the total number of cations (Ca2+, Na+, Mg2+, and K+) decreased, whereas the total number of anions (HCO3−, SO42−, NO3−, and Cl−) increased, resulting in a decrease in the percentage of exchangeable sodium (ESP), pH, and electrical conductivity (EC). The diameter at breast height, individual weight, and quantity of bamboo shoots increased annually, and the standing culm density increased by 1.4 times. Each year, the total nitrogen content decreased, whereas the alkali-hydrolyzed nitrogen, available phosphorus, and available potassium contents increased. Nitrogen application resulted in a significant decrease in ESP and pH and an increase in the total anion, cation, and EC values. It also reduced soil organic carbon, total nitrogen, total phosphorus, total potassium, available phosphorus, and available potassium. Nitrogen application increased the number of bamboo shoots, total yield, and accumulation of N and P; however, there was no significant difference between N2 and N3. In conclusion, the salinization of calcareous soil was alleviated, and the available nutrients were activated following the introduction of D. oldhami from south to north. The mineralization rates of organic matter and soil fertility increased. Soil acidification and EC decreased at the end of the shoot stage. Nitrogen application acidified the soil, and the yield and soil salt accumulation increased with increasing nitrogen levels. The nutrient uptake efficiencies of nutrients at high nitrogen levels were lower than those at medium nitrogen levels. Therefore, soil salt concentrations with values 0.26 < EC < 0.42 hindered the nutrient uptake of D. oldhami.

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High nutrients surplus led to deep soil nitrate accumulation and acidification after cropland conversion to apple orchards on the Loess Plateau, China

Ren

Gao

et al. 2023

Agriculture, Ecosystems & Environment

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Variations and influencing factors of nitrate accumulation in the deep soil profiles of apple orchards on the Loess Plateau

Cited by 22 publications

References 40 publications

Global synthesis on the response of soil microbial necromass carbon to climate‐smart agriculture

Global synthesis on the response of soil microbial necromass carbon to climate‐smart agriculture

Soil Nutrient, Salinity, and Alkalinity Responses of Dendrocalamopsis oldhami in High-Latitude Greenhouses Depending on Planting Year and Nitrogen Application

High nutrients surplus led to deep soil nitrate accumulation and acidification after cropland conversion to apple orchards on the Loess Plateau, China

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