Hydrologic separation and their contributions to N loss in an agricultural catchment in hilly red soil region

Wang, Yaji; Gao, Lei; Peng, Xinhua

doi:10.1007/s11430-018-9361-7

Cited by 17 publications

(9 citation statements)

References 23 publications

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“…Furthermore, the similarity in accumulation pattern for boreholes with different growth ages suggests that the RRC may retard but not stop the transport and leaching of NO 3 − -N. This inference on the distinctive accumulation process was supported by the fact that high NO 3 − -N concentration was observed in groundwater. 43 Therefore, it is the combined effect of planting year and regolith structure and properties that shaped the peak depth. − -N Accumulation Layers.…”

Section: ■ Discussionmentioning

confidence: 99%

“…41 Red soils in China occupy a land area of around 2 million km 2 and are a vital agricultural resource. 42 Overuse of N fertilizers (e.g., 567 kg N ha −1 for paddy fields), 43 intensive precipitation (about 200 mm per month in the rainy season), 39 and increasingly enhanced N deposition have resulted in a huge input of N to soils in this region. 11,44 More importantly, a previously overlooked accumulation of NO 3 − -N in deep red soil layers occurs as heterotrophic nitrification unlikely to be inhibited in acidic soils.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Red soils in China occupy a land area of around 2 million km 2 and are a vital agricultural resource . Overuse of N fertilizers (e.g., 567 kg N ha –1 for paddy fields), intensive precipitation (about 200 mm per month in the rainy season), and increasingly enhanced N deposition have resulted in a huge input of N to soils in this region. , More importantly, a previously overlooked accumulation of NO 3 – -N in deep red soil layers occurs as heterotrophic nitrification unlikely to be inhibited in acidic soils. , Furthermore, the surface land management and topography can also regulate the redistribution of deep NO 3 – -N in this region . These studies suggested that it is of significance to study the nitrate time bomb in subtropical red soil regions.…”

Section: Introductionmentioning

confidence: 99%

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Deep Nitrate Accumulation in a Highly Weathered Subtropical Critical Zone Depends on the Regolith Structure and Planting Year

Yang

Dong

et al. 2020

Environ. Sci. Technol.

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Nitrate accumulated deep (>100 cm) in the regolith (soil and saprolite) threatens groundwater quality, but most studies focus only on nitrate nearer the surface (<100 cm). Surface soil management versus regolith interactions affect deep nitrate leaching, but their combined impact remains unclear. This study measured how deep nitrate accumulation was affected by crop practices including orchard/cropland planting years, regolith structure, and soil properties in highly weathered subtropical red soils. Deep nitrate storage varied from 43.6 to 1116.3 kg ha–1. Regolith thickness was positively correlated with nitrate storage (R 2 = 0.43, p < 0.05). Reticulated red clay (110–838 cm) had 81% of the accumulated nitrate and overlapped with 79% of the nitrate accumulation layer. All of the nitrate accumulation parameters (except for peak depth (PD)) generally increased with the planting years. The difference in peak nitrate concentration (9.0–20.0 mg kg–1) with planting year gradient (3–58 years) varied by 2.2 times, and the difference in nitrate storage (43.6–425.7 kg ha–1) varied by 9.8 times. Texture and pH explain 41.6% of the variation in nitrate concentration. As soil management practices interact with deeper regolith to control the spatial pattern of nitrate accumulation, vulnerable regions could be identified to avoid high accumulation.

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Section: ■ Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Deep Nitrate Accumulation in a Highly Weathered Subtropical Critical Zone Depends on the Regolith Structure and Planting Year

Yang

Dong

et al. 2020

Environ. Sci. Technol.

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“…Ganzhou is one of the most important citrus‐producing regions in China. The soil type in this area is known as red soil, which is acidic with a pH value of approximately 5 (Wang, Gao, & Peng, ). The citrus species used in these experiments was the Newhall navel, with individual plant ages between 10 and 12 years.…”

Section: Methodsmentioning

confidence: 99%

Deciphering bacterial community variation during soil and leaf treatments with biologicals and biofertilizers to control huanglongbing in citrus trees

Bai

Wang

Jin

et al. 2019

Journal of Phytopathology

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The aim of the current study was to gain a clearer understanding of the bacteria involved in different treatments to control huanglongbing in citrus trees. The treatments included additions in soil or on leaf. In soil, there were two treatments, one was addition of biofertilizer mainly consisting of Brevibacillus laterosporus, and another one was the addition of burnt lime. On leaf treatment, a plant immunity inducer, Atailing spray, which is a fermented fungal protein product, was used. Besides, there was an integrative treatment including the above additions both in soil and on leaf. The control treatments had no addition. The growth of infected citrus plants was significantly improved by these treatments. We sampled soil under crown circumference, rhizosphere soil and roots, stems and leaves of the citrus trees. Sequencing of the 16S rDNA marker using Illumina methods was applied to determine the bacterial community composition of the samples. The results showed that in the soil samples under crown circumference, treatments increased the relative abundance of the genera Bradyrhizobium and Norank_f__Acidobacteriaceae__Subgroup_1_ compared with the control. In the rhizosphere soil samples, treatments increased the relative abundance of the genus Burkholderia–Paraburkholderia compared with the control. Atailing spray influenced the relative abundance of the bacterial genus norank_f__Acidobacteriaceae__Subgroup_1_ in the rhizosphere soil, as well as Pseudomonas in citrus leaves. Furthermore, 6 months after the treatments, the relative abundance of Actinobacteria and Bacilli at the class level was significantly increased in citrus plant leaves in the group treated with Atailing spray, biofertilizer and burnt lime. Overall, certain bacteria were stimulated by treatments, and the leaf‐associated bacterial communities had important indicators for the health of the citrus endophytic environment. These results provided a theoretical foundation for the development of biological approaches for huanglongbing treatment.

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“…Since the first three CZOs were established in the USA in 2007, about sixty-four CZOs were established worldwide up to 2015 (Giardino and Houser, 2015). In 2017, a committee summarized the progress of CZ science over the last decade and suggested further questions for the coming decade (Sullivan et al, 2017). In 2015, the National Natural Science Foundation of China (NSFC) and the Natural Environment Research Council, UK (NERC) jointly funded a major international cooperation research project "using critical zone science to understand sustaining the ecosystem service of soil and water".…”

mentioning

confidence: 99%

Understanding sustainability of soil and water resources in a critical zone perspective

Zhang

Zhu

Ming-an

2019

Sci. China Earth Sci.

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Hydrologic separation and their contributions to N loss in an agricultural catchment in hilly red soil region

Cited by 17 publications

References 23 publications

Deep Nitrate Accumulation in a Highly Weathered Subtropical Critical Zone Depends on the Regolith Structure and Planting Year

Deep Nitrate Accumulation in a Highly Weathered Subtropical Critical Zone Depends on the Regolith Structure and Planting Year

Deciphering bacterial community variation during soil and leaf treatments with biologicals and biofertilizers to control huanglongbing in citrus trees

Understanding sustainability of soil and water resources in a critical zone perspective

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