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total N,total p and organic matters content in floodplain soils of Xianghai Nature Reserve

Journal of Geographical Sciences 2002年第1期12卷 58-64页

作者： DENG Wei, ZHAI Jin-liang, HE Yan (Changchun Institute of Geography, CAS, Changchun 130021, China) Changchun Institute of Geography CAS Changchun China

Soil sediment samples of 10 layers with a spacing of 10 cm each were collected in different floodplain zones adjacent to Huolin River in the Xianghai Nature Reserve, and contents of total N, total p and organic matters were analyzed. The results showed that contents of total N, total p and organic matters were generally decreasing with the increase of distance from sample locations to the river channel, and contents of the three items were generally higher in the upper soil layer than that in the lower soil layer. The content variations displayed how flooding functions influenced nutrient matter content variations in floodplain soils since the flood inundation frequencies of the sample locations varied. The correlation analysis displayed that there were remarkable relativities between total N, total p and organic matters within definite spatial distance from the Huolin River channel.

关键词： floodplain wetland total N total p organic matter correlation analysis

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Nitrogen and phosphorus Runoff Losses from Orchard Soils in South China as Affected by Fertilization Depths and Rates

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pedosphere 2008年第1期18卷 45-53页

作者： ZENG Shu-Cai SU Zhi-Yao CHEN Bei-Guang WU Qi-Tang OUYANG Ying College of Forestry South China Agricultural University Guangzhou 510642 (China) College of Natural Resources and Environment South China Agricultural University Guangzhou 510642 (China) Department of Water Resources St. Johns River Water Management District P.O. Box 1429 Palatka FL 32178-1429 (USA)

Fertilizers are heavily applied in orchards of the hilly and mountainous topography of South China and may increase nutrient loadings to receiving waters.A simple runoff collecting system was used to measure the effects of different fertilization treatments on total N and p concentrations of surface runoff in a Chinese chestnut (Castanea mollissima Blume) orchard in Dongyuan County,Guangdong province,*** such orchards,fertilizer was typically applied in two short furrows or pits on either side of each *** included three application depths (surface,10cm and 20 cm),and three application rates (low,median and high).Results showed that 90.5% of the runoff water samples had a total N concentration higher than 0.35 mgL^(-1) and 54.2% had a total p concentration higher than 0.1 mgL^(-1).Fertilizer application at all depths and at all but the lowest rate significantly increased total N and p concentrations in runoff *** with chemical compound fertilizer at a soil depth of 20cm produced significantly lower (ptotal N concentration in runoff than both surface and 10-cm depth fertilization,and significantly lower (ptotal p concentration in runoff than surface *** N and p concentrations in runoff significantly increased with the application rate of organic *** the exception of total p concentrations,which were not significantly different between the control and fertilization at a rate of 119 kg p ha-1 in organic form,all the other fertilization treatments produced significantly higher total N and total p concentrations in runoff than the control.A fertilization depth≥20cm and an application rate≤72 kg N ha^(-1) or 119 kg p ha^(-1) for compound organic fertilizer was suggested to substantially reduce N and p runoff losses from hillslope orchards and to protect receiving waters in South China.

关键词： fertilization depth fertilization rate runoff total N total p

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predictions of soil and nutrient losses using a modified SWAT model in a large hilly-gully watershed of the Chinese Loess plateau

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International Soil and Water Conservation Research 2021年第2期9卷 291-304页

作者： Wenhai Shi Mingbin Huang The State Key Laboratory of Soil Erosion and Dryland Farming on the Loess plateau Institute of Soil and Water ConservationNorthwest A&F UniversityYanglingShaanxi Province712100China School of Water and Environment Chang’an UniversityXian710054China CAS Center for Excellence in Quaternary Science and Global Change XianShaanxi710061China University of Chinese Academy of Sciences Beijing100049China

Hydrological models are effective tools for assessing the effects of soil and nutrient losses on land ***(Soil and Water Assessment Tool)model is widely used to simulate soil and nutrient losses caused by various management ***,its performance of predicting nutrient loss has not been assessed adequately on the Loess *** study proposed a modified SWAT model by incorporating the modified Soil Conservation Service curve number method,the storm-based Chinese soil loss equation and the nutrient loss *** observed daily data of runoff and sediment over 16 years and the monthly soluble phosphorus(p)and nitrate losses over 9 years and 4 years,respectively at the outlet of the upper Beiluo river(UBR)basin were used to assess the model *** sensitivity and uncertainty analyses of parameters to runoff,sediment,soluble p and nitrate in the modified SWAT were *** findings during calibration and validation showed that the modified SWAT was highly accurate in terms of model efficiency(calibration:0.83,0.83,0.48,and 0.49;validation:0.58,0.57,0.53,and 0.65)for runoff,sediment,soluble p loss and nitrate loss,*** model efficiency indicated that the modified SWAT could accurately predict soil and nutrient losses at the river basin scale for the Loess ***,the temporal variations from month to year and the spatial variations at the sub-basin scale for soil loss and the total N and p losses were analysed using the data simulated by the modified *** results indicated that the critical loss period occurred in July and August,and the Grain for Green project significantly affected the hydrological behaviour and reduced the soil and nutrient losses in the UBR basin.

关键词： Sediment Runoff total N total p

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Spatial Distribution of Soil total Nutrients of Farmland in Liaoning province

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Agricultural Science & Technology 2010年第1期11卷 154-158页

作者：吕国红张玉书陈鹏狮纪瑞鹏焦晓光中国气象局沈阳大气环境研究所辽宁沈阳110016 中国科学院沈阳应用生态研究所辽宁沈阳110016 辽宁省气象局辽宁沈阳110001 黑龙江大学农业资源与环境学院黑龙江哈尔滨150080

[Objective]The aim was to reveal the spatial distribution characteristics of total nutrients in soil and provide a theoretical basis for farmland management and improvement of crop yield. [Method]GIS technique was used to analyze the spatial distribution characteristics of total C,total N,total p and total K for different soil layers in Liaoning province. [Result]The results showed that the content of total C,total N,total p decrease from east to west,but the content of total K was high in north district of Liaoning province. The content of total C,total N,total p and total K was higher in soil surface （0-20 cm） than the lower （20-40 cm）. total K varied less with soil depth,and its mean content was respectively 17.64 g/kg and 17.08 g/kg for soil surface and soil lower layer. [Conclusion]The results of the distribution of soil total nutrients in different soil layers supplied a theory basis for farmland management.

关键词： total C total N total p total K Spatial distribution

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