[1]ZHANG Shaokang,LIU Haiwei,JIAO Feng.Responses of Grassland Communities and Soil to Nitrogen and Phosphorus Additions in Micro-Topography of the Hilly Loess Plateau Region[J].Research of Soil and Water Conservation,2018,25(01):76-83.
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Responses of Grassland Communities and Soil to Nitrogen and Phosphorus Additions in Micro-Topography of the Hilly Loess Plateau Region
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
25
Number of periods:
2018 01
Page number:
76-83
Column:
Public date:
2018-02-28
- Title:
- Responses of Grassland Communities and Soil to Nitrogen and Phosphorus Additions in Micro-Topography of the Hilly Loess Plateau Region
- Keywords:
- nitrogen and phosphorus addition; biomass; leaf and root N; P; K; soil nutrient
- CLC:
- S812.2
- DOI:
- -
- Abstract:
- To study the effects of N and P addition on grassland community and soil, we used the way of adding N, P nutrient elements in different aspect-position in the grassland communities in Ansai Comprehensive Experimental Station of loess hilly region to study the aboveground and underground biomass, leaf, root and soil nutrient. The results show that:(1) aboveground biomass of the N and N+P treatments increased by 24.21% and 43.92%, respectively, compared with the control (CK), and the underground biomass reduced by 12.19% and 8.53%.; (2) the average leaf N contents in leaves decreased in the order:N+P > N > CK, increased by 26% and 17%, respectively, compared with the CK. The contents of P and K in leaves did not significantly increase. The ranges of average N/P in CK, N treatment and N+P treatment was 12.58~24.28, 16.67~4.82 and 12.56~23.07, respectively, and the trend presented N > CK > N+P, however, the difference was not significant (p > 0.05); (3) in CK, N and N+P treatments, the ranges of root N contents are 5.20～12.78, 1.54～14.30, 10.16～17.70 g/kg, root N contents increased by 34.38% and 63.45% in N and N+P treatments, respectively; the contents of P in roots were 0.22～0.38 g/kg, 0.38～0.87 g/kg and 0.63~0.94 g/kg, respectively, and variance analysis showed that the contents of P in roots significantly increased (p < 0.05); the root K content did not significantly change; the root N/P ratios were 26.02～49.94, 14.23～20.67 and 12.46～21.28, respectively, and the N/P ratios of the roots decreased with the fertilization; (4) the effect of fertilization on soil organic C was not significant, while total N contents increased significantly (p < 0.05). The contents of soil total P, available K content and N/P increased, but the differences were not significant. It indicated that N and P addition could improve soil nutrient status in loess hilly region, alleviate the nutrient limitation to plant growth, promote the absorption of other nutrient elements by plants, and make more plant nutrient distribute in the ground part.
- References:
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1900-01-01