[1]ZHAI Huiliang,ZHANG Lihui,WANG Gui,et al.Effects of Saline-Alkali Meadow Vegetation Degradation on Soil Nitrification Intensity[J].Research of Soil and Water Conservation,2021,28(02):21-26.
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Effects of Saline-Alkali Meadow Vegetation Degradation on Soil Nitrification Intensity
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
28
Number of periods:
2021 02
Page number:
21-26
Column:
Public date:
2021-02-06
- Title:
- Effects of Saline-Alkali Meadow Vegetation Degradation on Soil Nitrification Intensity
- Keywords:
- saline-alkali meadow grassland; nitrification intensity; vegetation degradation; mowing; nitrogen application
- CLC:
- S154.1
- DOI:
- -
- Abstract:
- In order to understand the characteristics and influencing factors of soil nitrification intensity in saline-alkaline meadow grasslands at different degradation stages, based on space-for-time method, and four typical plant communities in the process of saline-alkaline meadow grassland vegetation degradation in the Songnen Plain were selected as objects. Based on the untreated treatment, three treatments of cutting, nitrogen application and simultaneous nitrogen application were set. The soil nitrification intensity(NI), pH, electrical conductivity(EC), soil moisture content(SMC)and available phosphorus(OP), nitrate nitrogen(NO-3-N), ammonium nitrogen(NH+4-N)and total nitrogen(TN)content were investigated. The results showed that:(1)the soil nitrification intensity had a very significant positive correlation with pH, EC, SMC, OP and NO-3-N(p<0.01); through stepwise regression analysis, important influence factors of soil nitrification intensity were obtained, the influence of important factors on soil nitrification intensity were ranked as order: pH>OP>SMC>NO-3-N, and it could be concluded that soil nitrate nitrogen content could be used as an important characterization parameter for soil nitrification intensity;(2)the soil nitrification intensity of untreated Puccinellia tenuiflora community and Suaeda salsa community were 13.4 mg/(kg·h)and 13.5 mg/(kg·h), respectively, which were both much higher than those of Leymus chinensis community and degraded Leymus chinensis community [5.0 mg/(kg·h)and 2.5 mg/(kg·h)], respectively; mowing and nitrogen treatment increased the soil nitrification intensity of Puccinellia tenuiflora community by 96.88% and 253.77%, respectively, and mixed treatment increased 413.70%, which was significantly higher than that of the other three plant communities. It can be seen that the soil ammonium nitrogen in the Puccinellia tenuiflora community may be more easily converted to nitrate nitrogen under the intervention of man-made mowing and nitrogen fertilizer application, and the risk of nitrogen loss is also greater. Therefore, it can be considered that the Puccinellia tenuiflora community is at a critical stage in the degradation process of saline-alkali meadows.
- References:
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Last Update:
2021-02-10