[1]Cui Mengying,Zhou Ronglei,Zheng Cheng,et al.Responses of Aboveground Biomass and Soil Moisture and Nutrients to Microtopographic Changes in Grassland in the Loess Hilly Region[J].Research of Soil and Water Conservation,2024,31(01):18-26.[doi:10.13869/j.cnki.rswc.2024.01.043]
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Responses of Aboveground Biomass and Soil Moisture and Nutrients to Microtopographic Changes in Grassland in the Loess Hilly Region
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
31
Number of periods:
2024 01
Page number:
18-26
Column:
Public date:
2024-02-20
- Title:
- Responses of Aboveground Biomass and Soil Moisture and Nutrients to Microtopographic Changes in Grassland in the Loess Hilly Region
- Keywords:
- grassland ecosystem; microtopography; SOC; STN; STP; SWC; aboveground biomass
- CLC:
- S812.2
- DOI:
- 10.13869/j.cnki.rswc.2024.01.043
- Abstract:
- [Objective] In complex terrain areas, it is of great significance for rational utilization and scientific management of grassland ecosystem to understand the impact of terrain changes on grassland productivity and soil moisture and nutrients, so as to provide reference and basis for ecological restoration and productivity maintenance in complex terrain areas of grassland ecosystem. [Methods] The grassland ecosystem in the loess hilly area was taken as the research object, the above ground biomass of grassland, the contents of soil organic carbon, total nitrogen and total phosphorus of 0—40 cm and soil moisture of 0—100 cm were studied by using one-way analysis of variance, Duncan's multiple comparison and Pearson correlation analysis. [Results](1)On the sunny slope, aboveground biomass decreased gradually with the decrease of slope position and showed a highly significant difference. The contents of SOC and STN decreased with the slope position decreasing, and the content of STP changed in a V-shaped pattern with the decrease of slope position. On the shady slope, aboveground biomass showed an increasing trend with the decrease of slope position. The content of STP increased with the decrease of the slope position. There were significant differences in SOC, STN and STP contents in different slope directions and positions.(2)The contents of SOC, STN and STP all decreased with the deepening of soil layer, and the content of total phosphorus didn't change significantly. The average moisture contents of the six microtopography increased with the increase of soil depth, and there were significant differences among the soil moisture contents of the six microtopography in the soil layer greater than 40 cm.(3)Correlation analysis showed that STP in 0—20 cm soil layer was significantly negatively correlated with aboveground biomass, SOC in 20—40 cm soil layer was significantly positively correlated with aboveground biomass, and SWC in 40—80 cm soil layer was significantly positively correlated with aboveground biomass. The multiple linear regression analysis equation showed that the combined effect of SOC, STP and SWC in the topsoil layer at vertical height had the effect on aboveground biomass with an explanation of 69.4%. [Conclusion] Microtopography had a significant distribution effect on aboveground biomass, soil organic carbon, total nitrogen, total phosphorus and soil moisture contents. In the topsoil layer, soil organic carbon, total phosphorus and soil moisture contents were significantly correlated with aboveground biomass, and had a certain influence on aboveground biomass.
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Last Update:
2024-02-20