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Chinese Agricultural Science Bulletin ›› 2017, Vol. 33 ›› Issue (8): 99-103.doi: 10.11924/j.issn.1000-6850.casb16080071

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Comparison of Farmland Nutrients Loss in Two Small Basins of Danjiangkou Reservoir

  

  • Received:2016-08-16 Revised:2017-03-06 Accepted:2016-09-22 Online:2017-03-17 Published:2017-03-17

Abstract: The Donggou villagers group of Taozhuang River basin and Zhengwan village of Tiewa River basin were as representatives to study their common land types--corn and orchard whose nutrient loss characteristics and differences of nutrient concentration in surface runoff; SCS model were applied to estimate the runoff depth of the two types of land use together with rainfall data, on this basis, the nutrients loss in normal flow year were estimated. Result is that the loss of TN, NO3-N, NH3-N and their content from runoff in the corn in Taozhuang River basin were lower than that in Tiewa River basin, but the loss and content of CODMn and TP were higher than that in Tiewa River basin; For orchard, the nutrients loss and content in runoff in Taozhuang River basin were all higher than that in Tiewa River basin ; The order of nutrients loss and content were consistent in the two types of farmland in Taozhuang River basin , roughly CODMn > TN > NO3 -N> NH3 - N > TP, which indicated organic fertilizer were used more than nitrogen and phosphate fertilizer, the order was followed in orchard in Tiewa River basin, but the order in corn was TN > NO3 -N > CODMn > NH3 - N > TP, which showed nitrogen fertilizer were used more than organic and phosphate fertilizer. Conclusion: it’s time to adopt scientific and reasonable fertilization way, such as testing soil for formulated fertilization, to reduce non-point source pollution in farmland , improve the utilization rate of fertilizer and increase crop output.