| Response of soda-type meadow alkali soil aggregates to long-term organic fertilization |
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| DOI：10.7606/j.issn.1000-7601.2018.03.21 |
| Key Words: organic fertilizer long-term fertilization meadow alkaline soil water-stable aggregates structural stability |
| Author Name | Affiliation | | LI Yu-zhu | College of Resources and Environment, Northeast Agricultural University, Harbin, Heilongjiang 150030, China | | LI Xin-lun | College of Resources and Environment, Northeast Agricultural University, Harbin, Heilongjiang 150030, China | | QU Xiao-ze | College of Resources and Environment, Northeast Agricultural University, Harbin, Heilongjiang 150030, China | | MENG Qing-feng | College of Resources and Environment, Northeast Agricultural University, Harbin, Heilongjiang 150030, China | | ZHOU Ming | College of Resources and Environment, Northeast Agricultural University, Harbin, Heilongjiang 150030, China | | ZHANG Ze-hui | College of Resources and Environment, Northeast Agricultural University, Harbin, Heilongjiang 150030, China | | XIONG Feng | College of Resources and Environment, Northeast Agricultural University, Harbin, Heilongjiang 150030, China | | TANG Xin-tian | College of Resources and Environment, Northeast Agricultural University, Harbin, Heilongjiang 150030, China |
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| Abstract: |
| Sodic meadow alkaline soils in western Songnen Plain are characterized by strong alkaline and poor structure. Based on long-term location test, this study exploered the aggregate characteristics of soda-type meadow alkali soil under long-term application of organic fertilizer. According to the organic fertilizer application stage, 4 treatment was set: organic treatment was performed for 5 years (S5), 9 years (S9), 12 years (S12), and treatment with no fertilizer was used as control (CK), each process was replicated for three times. Distribution characteristics of soil water stable aggregates, the average weight diameter, the geometric mean diameter and the fractal dimension were studied. The results showed that the number of large aggregates of soda meadow alkaline soil increased after organic fertilizer treatment, and the number of small aggregates decreased. The highest content (35.20%) of large aggregates was from treatment by organic fertilizer 9 years; The average weight diameter (27.54~54.22 mm) and geometric mean diameter (0.13~0.17 mm) of the water-stable aggregates were both higher than that of CK (13.48 mm、0.08 mm). The fractal dimension (2.86~2.88) was lower than that of CK (2.95), the best stability of soil structure (average weight diameter 54.22 mm, geometric mean diameter 0.17 mm, fractal dimension 2.86) was from 9 years’ organic fertilization . The regression analysis showed that the content of water-stable macro aggregates was positively correlated with average weight diameter and geometric mean diameter, and negatively correlated with fractal dimension. We can conclude that organic fertilization treatment promoted the formation of large aggregates in the surface soil and improved its structural stability, and it was best after 9 years’ organic fertilization. |
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