| Effects of combined application of polyacrylamide and super absorbent polymers on nitrogen leaching from sloping lands in arid area |
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| DOI：10.7606/j.issn.1000-7601.2019.04.14 |
| Key Words: PAM SAP total nitrogen leaching runoff soil and water conservation sloping lands |
| Author Name | Affiliation | | FU Chen-xing | Inner Mongolia Agricultural University, Huhehot, Inner Mongolia 010018, China | | WEI Zhan-min | Inner Mongolia Agricultural University, Huhehot, Inner Mongolia 010018, China | | WANG Xiao-yu | Inner Mongolia Agricultural University, Huhehot, Inner Mongolia 010018, China | | ZHANG Jin-ding | Inner Mongolia Agricultural University, Huhehot, Inner Mongolia 010018, China | | WANG Fu | Inner Mongolia Agricultural University, Huhehot, Inner Mongolia 010018, China | | YANG Xu-dong | Inner Mongolia Agricultural University, Huhehot, Inner Mongolia 010018, China |
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| Abstract: |
| The combined application of polyacrylamid (PAM) and super absorbent polymers (SAP) are important for reducing soil nitrogen (N) runoff loss. To further understand the process, we studied the effects of seven combined application methods of PAM and SAP on runoff and N leaching under a simulated rainfall intensity of 40 mm·h-1 for a duration of 3 hours on sloping lands in arid area. The results showed that, compared with the control treatment, the combined application of PAM and SAP effectively reduced N runoff and N leaching. The runoff was decreased by 93.29% and the amount of total N leaching in runoff was reduced by 25.58%. The water holding effect of SAP was better than PAM. At the same time, the amount of soil erosion was reduced by 91.85%, and the amount of total N leaching in sediment was decreased by 37.96%. From the nutrient distribution of soil profile after rainfall, the N content in 0~15 cm soil was 50.24% higher than that of the control group, which indicated that the combined application of PAM and SAP increased the ability of water and N holding of the root layer, and reduced the deep layer leakage of soil nutrients with water. Soil conservation effect of PAM was better than SAP. The combined application of PAM and SAP in sloping lands can not only reduce soil erosion, but also can reduce soil N loss and prevent the pollution of fertilizers to groundwater, which provides a theoretical basis for the combined application of PAM and SAP in arid area. |
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