Spatial and temporal variability of soil C/N ratio in Songnen Plain maize belt

The C/N ratio of soils is a sensitive indicator of soil quality, and an indicator for assessing carbon and nitrogen nutrition balance of soils. Its variation is significant in reflecting the carbon and nitrogen cycling of soils. Based on field investigation, sample collection and analysis, and appli...

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Bibliographic Details
Published inHuanjing kexue Vol. 32; no. 5; p. 1407
Main Authors Zhang, Chun-hua, Wang, Zong-ming, Ju, Wei-min, Ren, Chun-ying
Format Journal Article
LanguageChinese
Published China 01.05.2011
Subjects
Carbon - analysis
China
Environmental Monitoring
Geographic Information Systems
Nitrogen - analysis
Soil - analysis
Zea mays - growth & development
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Summary:The C/N ratio of soils is a sensitive indicator of soil quality, and an indicator for assessing carbon and nitrogen nutrition balance of soils. Its variation is significant in reflecting the carbon and nitrogen cycling of soils. Based on field investigation, sample collection and analysis, and application of geostatistics and GIS technology, spatial and temporal variation of C/N ratio was analyzed and studied from 1980 to 2005 in Songnen Plain maize belt. The results indicated that the mean value of C/N ratio is 10.56 and 12.30 in 1980 and 2005, respectively. Spatial correlation distance of soil C/N ratio in two periods is 196.3 km and 51.1 km, showing a decreasing trend, which indicated that farming management factors were enhancing. In the past 25 years, 84.88% of soil C/N ratio was on rise with the highest value in the west of the study area, but parts of Dehui County and Jiutai County decreased. As for different land use types, soil C/N ratios in the upland, paddy land, forest and woodland and grassland s
ISSN:0250-3301