| Dynamic analysis of soil nitrogen factors of typical farmland in blacksoil region |
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| DOI：10.7606/j.issn.1000-7601.2009.01.09 |
| Key Words: soil nutrients soil total nitrogen soil alkali-hydroly sable nitrogen spatial distribution |
| Author Name | Affiliation | | YIN Sheng | Resources and Environment Institute, Northeast Agricultural University, Harbin, Heilongjiang 150030， China | | ZHAO Jun | Heilongjiang Key Laboratory of Blacksoil Ecology， Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Harbin， Heilongjiang 150081， China | | GU Siyu | Resources and Environment Institute, Northeast Agricultural University, Harbin, Heilongjiang 150030， China | | GE Cuiping | Heilongjiang Key Laboratory of Blacksoil Ecology， Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Harbin， Heilongjiang 150081， China
Graduate University of Chinese Academy of Sciences，Beijing 100049， China | | ZHANG Lei | Heilongjiang Key Laboratory of Blacksoil Ecology， Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Harbin， Heilongjiang 150081， China
Northeast Forestry University，Harbin, Heilongjiang 150040， China | | ZHANG Wencheng | Shuangcheng Center of Agricultural Technology Transfer，Shuangcheng， Heilongjiang 150100， China | | BEN Hongdong | Shuangcheng Center of Agricultural Technology Transfer，Shuangcheng， Heilongjiang 150100， China |
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| Abstract: |
| Soil total nitrogen (TN) content and soil alkali hydrolysable nitrogen content(AN) of farmland in Shuangcheng w ere studied. 500 soil samples w ere taken from the field with the soil layer of 0~20 cm，and got the map of soil nitrogen variance in 2005. The maps of soil TN and AN (1:50000) in the 1980s w ere digi-tized and overlaid with the correspondent maps of 2005 using ArcMap. The results of geostat ist ics analysis showed that both of them w ere a relative significantly spat ial heterogeneity，mainly affected by factors of struc-tures. In the past 22 years' succession survey for soil quantities from 1980s， TN and AN show increase. The average valueof TN in 2005 was 1.86 g/kg，increasing by 0.36 g/ kg, with the amplitude 24%; while the av-erage value of AN in 2005 was 137.8 mg/ kg, increasing by 16.8 mg/ kg with the amplitude 13. 9%. This anal-ysis is very useful to help farmers use fertilizer properly，improve soil quality and preserve ecological environ-ment. |
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