Journal of Food, Agriculture and Environment

Effects of long-term fertilisation on chemical structure of soil organic matter in subtropical paddy soils

Author(s):

Ping Zhou ¹, Lu Luo ^{1, 2}, Chengli Tong ¹*, Tieping Huang ³, Hui Shi ², Yong Li ^{1, 4}, Jinshui Wu ^{1, 4}

Recieved Date: 2013-06-23, Accepted Date: 2013-09-10

Abstract:

The content and chemical structure of soil organic matter (SOM) from three subtropical paddy soils under long-term fertilisations was evaluated. The aim was to detect the role of chemical structure of SOM in the accumulation of SOM. The paddy soils were located in Xinhua, Taojiang and Ningxiang counties in Hunan province, China and were under long-term agro-ecosystem experiments since 1986. Fertilisation treatments included no fertiliser (CK), chemical fertiliser (NPK), conventional fertilisation (CUT), straw returning (STW) and chemical fertiliser plus low or high rates of organic manure (LOM or HOM). Results showed that organic-inorganic fertilisations distinctively increased the contents of soil organic carbon (SOC) in the surface layer (0-20 cm), with 12.9-18.5%, 18.3-58.9% and 41.4-60.0% under HOM, LOM and STW, respectively, compared to that under CK. Yet the NPK treatment showed no effect on the content of SOC. Data from the Fourier transform infrared spectroscopy (FTIR) showed that the intensity of absorption peaks of chemical resistance compounds (aliphatic, aromatic), carbohydrate and organosilicon compounds were increased distinctively under fertilisation treatments, with the highest intensity of these compounds under treatments of STW, LOM and HOM. For example, the intensity of absorption peak of alkane for the three paddy soils was 0.22-0.34, 0.24-0.27 and 0.15-0.29 under HOM, LOM and STW, respectively. These values were 58-88%, 44-70% and 26-80% compared to that under CK treatment. In addition, the contents of SOC and the intensity of functional groups of SOM from Taojiang site (shale) were always higher than those from Xinhua and Ningxiang sites (river alluvium) under different fertilisations. The results indicated that the enhanced chemical resistance of functional groups of SOM appears to contribute to the increased contents of SOC under different fertilisations in subtropical paddy soils.

Keywords:

Fertilisation, paddy soil, organic carbon, FTIR, parent material, chemical stabilisation

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Environment
Pages: 2737-2741

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