RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2015, Vol. 24 >> Issue (09): 1491-1498.doi: 10.11870/cjlyzyyhj201509008

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Feature analysis of soil water leakage and leaching of nitrogen and phosphorus in the typical farmland of taihu lake basin based on hydrus-1d model

LAI Xiao-ming1,2, LIAO Kai-hua1, ZHU Qing1, LV Li-gang1,3, XU Fei1,2   

  1. 1. Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;
    2. University of Chinese academy of sciences, Beijing 100049, China;
    3. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210046, China
  • Received:2014-12-17 Revised:2015-03-24 Online:2015-09-20
  • Contact: 朱青,E-mail:qzhu@niglas.ac.cn E-mail:qzhu@niglas.ac.cn

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Abstract: Taihu Lake Basin is one of the most serious polluted areas in China, while the eutrophication is the main environmental problem, which is mainly caused by the agricultural non-point source pollution as commonly considered. Therefore, an in-depth study of the agricultural leaching of nitrogen and phosphorus under rice-wheat rotation in Taihu Lake Basin is necessary. In order to get the data of leaching nitrogen and phosphorus, the concentration of the nitrogen and phosphorus in soil water sample should be tested and the leakage of soil water should be acquired. Traditional methods on that have many limitations in practical applications and generally the time-continuous leaching of nitrogen and phosphorus can't be obtained. While in this study, based on long-term measurement of soil water content, the farmland soil water leakage under rice-wheat rotation was simulated using the Hydrus-1D model. Combining simulation results and measurements of soil water nitrogen and phosphorus concentrations at the depth of 60 cm, the leaching of nitrogen and phosphorus were obtained. Comparing to the traditional methods, this method can calculate the data of the leaching of nitrogen and phosphorus by less measurement data. Results showed that the Hyrus-1D model can well simulate the leakage of soil water in the farmlands of Taihu Lake Basin. The soil water leakage was influenced by precipitation, irrigation and antecedent soil water content. The leakage amount was little and the time of duration was long during wheat growing season; while during rice growing season, the leakage amount was large and the time of duration was short. The leaching of ammonium nitrogen and dissolved phosphorus mainly occur during the rice growing season. The leaching of ammonium nitrogen during this period (2.62 kg/hm2) accounted for 96.0% of the total leaching during the whole study period. The leaching of dissolved phosphorus (0.49 kg/hm2) accounted for 96.0% of the total leaching. However, the leaching of nitrate nitrogen mainly occurred during the wheat growing season. The leaching during this season (57.97 kg/hm2) accounted for 89.5% of the total leaching during the whole study period. The main form of inorganic nitrogen leaching from soil was nitrate nitrogen, which accounted for 96.4% of the total inorganic nitrogen leaching. In conclusion, the nitrate nitrogen should be the key control targets in preventing agricultural non-point source pollution, to reduce the risk of agricultural non-point source pollution contaminating the quality of the groundwater and Taihu Lake water body. Besides, the peak leaching time of nitrogen and phosphorus is during fallow period and at the early stage of the growth of paddy (June and July), due to the unstable soil and undeveloped roots in field and frequent rainfall during these periods.

Key words: soil water content, eutrophication, rice-wheat rotation, nitrogen and phosphorus leaching

CLC Number: 

  • X171
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