| Cite this article: | 马天,高 峰,刘春成,等.再生水滴灌与畦灌加硒灌溉对土壤硒空间分布的影响[J].灌溉排水学报,2022,(10):-. |
| Ma Tian,Gao Feng,Liu Chuncheng,et al.再生水滴灌与畦灌加硒灌溉对土壤硒空间分布的影响[J].灌溉排水学报,2022,(10):-. |
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| DOI： |
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| Effects of reclaimed water drip irrigation and border irrigation plusselenium irrigation on spatial distribution of soil selenium |
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Ma Tian,Gao Feng,Liu Chuncheng,et al
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Farmland Irrigation Research Institute
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| Abstract: |
| 【Objective】The effects of reclaimed water drip irrigation and border irrigation plus selenium irrigation on the spatial accumulation and distribution of selenium in soil were studied.【Method】 Using the pot experiment of water and fertilizer integrated selenium addition method, two high and low selenium addition amounts (H: 4mg / kg, L: 1mg / kg) and three irrigation methods (2D: 2L / h drip irrigation, 4D: 4L / h drip irrigation, Q: small border irrigation) were set, with a total of 8 treatments (2DL, 4DL, QL, 2DH, 4DH, QH, CK1 without selenium, CK2 with high selenium in clear water). Under the irrigation conditions of reclaimed water drip irrigation and border irrigation, Effects of different amounts of exogenous selenium on spatial accumulation and distribution of soil selenium. 【Result】Except for the treatment without selenium (CK1) (P > 0.05), the selenium content of 0-10cm soil was significantly higher than that of 10-20cm soil (P < 0.05); In the soil 10cm away from the emitter, the selenium content of 2DL, 4DL and QL treatments with low selenium content increased by 1.04, 1.21 and 0.83 times respectively compared with CK1 soil, and the selenium content of 2DH, 4DH and QH treatments with high selenium content increased by 2.03, 2.31 and 2.48 times respectively compared with CK1 soil; The contour map of soil selenium content in 2DL and 2DH treatments of 2L/ h drip irrigation showed a "narrow and deep" type, the soil selenium content in 4DLand 4DH treatments of 4L / h drip irrigation showed a "pudgy" type, the soil selenium content in QL treatment of small border irrigation showed a "pudgy" type, and the soil selenium content in QH treatment of small border irrigation showed a "near horizontal contour type". 【Conclusion】Selenium irrigation significantly increased the soil selenium content in the cultivated layer, and the application amount of exogenous selenium in the range of 1mg / kg ~ 4mg / kg can ensure that it is within the threshold range of selenium content in medium selenium and selenium rich soil; The accumulation of exogenous selenium in 2L / h drip irrigation plus selenium soil basically conforms to the distribution law of irrigation wetting body. Compared with border irrigation, it is more conducive to the accumulation of exogenous selenium near the plant root layer and reduce the deep leaching of exogenous selenium. |
| Key words: Drip irrigation plus selenium; Reclaimed water; Soil selenium; Soil physical and chemical properties |
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