Nitrogen leaching in an upland cropping system on an acid soil in subtropical China: lysimeter measurements and simulation

Sun, Bo; Chen, Deli; Li, Yong; Wang, Xingxiang

doi:10.1007/s10705-008-9164-4

Cited by 22 publications

(15 citation statements)

References 26 publications

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“…2c), rather than linear, which is consistent with previous analysis (Hansen and Djurhuus, 1996;Lord and Mitchell, 1998;Simmelsgaard and Djurhuus, 1998;Fern andez-Escobar et al, 2004;Di and Cameron, 2007;Sun et al, 2008;Huang et al, 2011;Chen et al, 2014;Xue et al, 2014;Amon-Armah et al, 2015). Fig.…”

Section: Nonlinearity Of Leaching Response To N Ratesupporting

confidence: 91%

Quantifying nitrogen leaching response to fertilizer additions in China's cropland

Gao

Zhou

et al. 2016

Environmental Pollution

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a b s t r a c tAgricultural soils account for more than 50% of nitrogen leaching (L N ) to groundwater in China. When excess levels of nitrogen accumulate in groundwater, it poses a risk of adverse health effects. Despite this recognition, estimation of L N from cropland soils in a broad spatial scale is still quite uncertain in China. The uncertainty of L N primarily stems from the shape of nitrogen leaching response to fertilizer additions (N rate ) and the role of environmental conditions. On the basis of 453 site-years at 51 sites across China, we explored the nonlinearity and variability of the response of L N to N rate and developed an empirical statistical model to determine how environmental factors regulate the rate of N leaching (LR). The result shows that L N -N rate relationship is convex for most crop types, and varies by local hydro-climates and soil organic carbon. Variability of air temperature explains a half (~52%) of the spatial variation of LR. The results of model calibration and validation indicate that incorporating this empirical knowledge into a predictive model could accurately capture the variation in leaching and produce a reasonable upscaling from site to country. The fertilizer-induced L N in 2008 for China's cropland were 0.88 ± 0.23 TgN (1s), significantly lower than the linear or uniform model, as assumed by Food and Agriculture Organization and MITERRA-EUROPE models. These results also imply that future policy to reduce N leaching from cropland needs to consider environmental variability rather than solely attempt to reduce N rate .

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Section: Nonlinearity Of Leaching Response To N Ratesupporting

confidence: 91%

Quantifying nitrogen leaching response to fertilizer additions in China's cropland

Gao

Zhou

et al. 2016

Environmental Pollution

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“…N fertilizer application elevated N storage in the soil-adsorption pool and hence increased the potential risk of N leaching. The model results were highly consistent with field studies performed in the same region by Sun et al (2008) and Li et al (2004). Therefore a decrease in application of chemical fertilizers to a more rational level will cause a decline in N leaching effectively.…”

Section: Implications and Policies From Alternative Simulationssupporting

confidence: 90%

GIS-model based estimation of nitrogen leaching from croplands of China

Qiu

Wang

et al. 2011

Nutr Cycl Agroecosyst

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Nitrogen (N) is the most widely used fertilizer nutrient, and its application has increased substantially in recent decades in China. N loss through leaching has been recognized as one of the most common agricultural sources of groundwater contamination. Thus, prediction of N leaching from cropland is crucial for preventing groundwater pollution. This paper quantifies nitrogen leaching from China's croplands, identifies its spatial distribution under current cropping systems at national scale, and finally puts forward some policies or strategies to reduce rates of N leaching. A computer process simulation model of carbon and nitrogen biogeochemistry in agro-ecosystems (DNDC) was applied to predict nitrogen leaching in the soil layer of agricultural ecosystems at national scale. Data on climate, soil properties, cropping systems, acreage, and management practices at county scale were collected from various sources and integrated into a spatial GIS database to run the model. The total amount of N-leaching was predicted at 4.57 million t N/year, which is equivalent to 48 kg N per ha cropland in 1998. The spatial distribution of N leaching in China showed a sharp discrepancy between the northern and southern counties due to the differences in climatic conditions, soil properties, as well as farm management practices. The study also suggests that applying management alternatives, such as proper fertilizer, crop, water and soil management, could be efficient means for decreasing N leaching rates

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“…Rainfall had a greater impact on nitrate leaching than crop uptake. The loss of nitrate was low during the dry season (October-February) and in the dry year (rainfall 17% below average) mainly as a result of reduced drainage (Sun et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Accumulation and depletion of fertilizer originated nitrate-N and ammonium-N in deeper soil layers

Füleky

2014

Columella

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The leaching process of nitrate was studied in a long-term field experiment at Gödöllő on a brown forest soil started in 1969. 0, 90, 180, 270, 360 kg ha -1 y -1 N doses have been broadcasted as basal fertilization in the form of ammonium-nitrate for 16 years. The test plant was maize in monoculture. In autumn 1989 fertilization was discontinued and alfalfa was sown on the experimental area. In 1995 pseudoacacia was planted into the field. In 1986In , 1989In , 1994 the soils of the treatments were sampled in 6 replications from 0 to 3 meters depth at every 20 cm. The nitrate-N and ammonium-N content of the sample was determined.Increasing the dose of nitrogen fertilization nitrate content in the soil profile increased, as well. About the half of fertilizer nitrogen can be found in the 3 meter layer of the soil profile after 16 years fertilization. Using deep rooting plants the accumulated nitrogen could be used to prevent the leaching losses.Results prove the necessity of a suitable technology preventing nitrate losses. As the experiment shows 100 kg N ha -1 fertilizer nitrogen enough for the maximum crop yield in this area. The amount of nitrate-N exceeding plant demand could be leached into 1-3 meter depth of soil or into deeper horizons.

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Nitrogen leaching in an upland cropping system on an acid soil in subtropical China: lysimeter measurements and simulation

Cited by 22 publications

References 26 publications

Quantifying nitrogen leaching response to fertilizer additions in China's cropland

Quantifying nitrogen leaching response to fertilizer additions in China's cropland

GIS-model based estimation of nitrogen leaching from croplands of China

Accumulation and depletion of fertilizer originated nitrate-N and ammonium-N in deeper soil layers

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