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| Research on the variation characteristics of pH and mineral nitrogen concentrations in different planting time polytunnel soils of Milin County in Tibet |
| Received:June 10, 2016 |
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| KeyWord:soil pH;nitrate nitrogen;ammonium nitrogen;open field;polytunnel |
| Author Name | Affiliation | E-mail | | YANG Hong | Research Center of Climate Change and Material Cycle of Pedosphere of Tibet Plateau, College of Agricultural and Animal Husbandry, Tibet University, Linzhi 860000, China | | | XU Chang-chang | Research Center of Climate Change and Material Cycle of Pedosphere of Tibet Plateau, College of Agricultural and Animal Husbandry, Tibet University, Linzhi 860000, China | | | CAO Li-hua | Research Center of Climate Change and Material Cycle of Pedosphere of Tibet Plateau, College of Agricultural and Animal Husbandry, Tibet University, Linzhi 860000, China | | | SHI Yu-long | Research Center of Climate Change and Material Cycle of Pedosphere of Tibet Plateau, College of Agricultural and Animal Husbandry, Tibet University, Linzhi 860000, China | | | SAI Man | Research Center of Climate Change and Material Cycle of Pedosphere of Tibet Plateau, College of Agricultural and Animal Husbandry, Tibet University, Linzhi 860000, China | | | LIU He-man | Research Center of Climate Change and Material Cycle of Pedosphere of Tibet Plateau, College of Agricultural and Animal Husbandry, Tibet University, Linzhi 860000, China | liuh-m@163.com |
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| Abstract: |
| In order to elucidate variation characteristics of soil pH and mineral nitrogen(Nmin) concentrations between open fields and different planting time polytunnel fields, then provide scientific support for the sustainable utilization of soil in Tibet area. Different planting time polytunnel(1 a, 4 a and 6 a) and there adjacent open fields in Milin County were investigated, surface soil(0~20 cm depth) and profile soil(0~70 cm depth) were collected, and the soil nitrate nitrogen(NN) and ammonium nitrogen(AN) concentrations and pH were determined. The results showed that, Soil NN concentrations had the decrease sequences as 1 a polytunnel > 4 a polytunnel > 6 a polytunnel > open field; soil AN concentrations were 6 a polytunnel > 4 a polytunnel > open field >1 a polytunnel; and soil pH were 1 a polytunnel > open field > 4 a polytunnel > 6 a polytunnel; Compared to the open field soil, the soil NN and Nmin concentrations in polytunnel soils increased in 0~20 cm arable layer, and they were all decreased with the increase of soil depth; Compared to open field soil, pH decreased for 0~20 cm polytunnel soil, and then increased with the increase of soil depth; Regression analysis showed a negative correlation between soil pH to NN and AN concentrations for polytunnel soils; but for the open field soil, they were negatively correlated. These results indicated that polytunnel management resulted in soil acidification of arable layer, and increase of soil Nmin; so the application of nitrogen fertilizer need be reduced for polytunnel soil. |
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