[1]Li Dongyuan,Shen Nan,Zhang Fengbao,et al.Study on characteristics of nitrogen and phosphorus loss in slope farmland on the Loess Plateau under different control measures[J].Research of Soil and Water Conservation,2025,32(06):84-95.[doi:10.13869/j.cnki.rswc.2025.06.004]
Copy
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
32
Number of periods:
2025 06
Page number:
84-95
Column:
Public date:
2025-10-20
- Title:
-
Study on characteristics of nitrogen and phosphorus loss in slope farmland on the Loess Plateau under different control measures
- Author(s):
-
Li Dongyuan1,Shen Nan1,2,Zhang Fengbao1,2,Li Xuantian1,Lan Xuyang1,Li Jiamin1,Yang Chenglong1,Yang Mingyi1,2
-
(1.State Key Laboratory of Soil and Water Conservation and Desertification Control,NorthwestA & F University,Yangling,Shaanxi 712100,China;2.Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,Shaanxi 712100,China)
-
- Keywords:
-
Loess Plateau; slope farmland; artificial rainfall simulation in the field; nutrient loss; biochar; tillage measures
- CLC:
-
S157.2
- DOI:
-
10.13869/j.cnki.rswc.2025.06.004
- Abstract:
-
[Objective] This study aims to investigate the effects of different control measures on the characteristics of nitrogen and phosphorus loss in the slope farmland of the Loess Plateau in Shanxi Province, providing a theoretical basis for the mechanisms of nitrogen and phosphorus loss and ecological regulation under the coupling of multiple measures. [Methods] Taking typical slope farmland of the Loess Plateau in Shanxi Province as the research object, this study implemented different measures including traditional tillage, no-tillage, biochar, straw, bacterial biofertilizer, and their combinations. Through artificial rainfall simulation experiments in the field, this study investigated the relationship between nitrogen and phosphorus loss through runoff and sediment yield under different control measures, quantified the contribution ratios of nitrogen and phosphorus loss carried by runoff and sediment, and explored the enrichment ratios of total nitrogen and total phosphorus in sediment. [Results](1) No runoff or sediment yield was observed in six straw-treated plots, indicating that this measure effectively mitigated soil erosion in the slope farmland and thus reduced nitrogen and phosphorus loss. (2) Under different control measures, changes of total phosphorus concentration in runoff with the rainfall process remained stable, whereas the total phosphorus concentration in sediment exhibited significant fluctuations. Under the measure combining traditional tillage, biochar, and bacterial biofertilizer, phosphorus content in runoff was low, while phosphorus content in sediment was comparatively high.(3) Total phosphorus in runoff, total nitrogen and phosphorus in sediment showed strong correlations with runoff and sediment yield(|r|:0.648~0.930, p<0.05), while nitrate nitrogen, ammonium nitrogen, and total nitrogen in runoff had weak correlations(|r|:0.008~0.605, p>0.05).(4) During runoff and sediment yield processes, nitrogen was mainly lost via runoff(63%~90%), primarily in the form of nitrate nitrogen, while phosphorus loss was primarily associated with sediment transport (97%~99.9%).(5) During the process of soil erosion and sediment yield in the sloping farmland, the average enrichment ratio of total nitrogen in sediment under all measures was 2.94, indicating nitrogen enrichment. The average enrichment ratio of total phosphorus in sediment under no-tillage and its combinations with other measures was 0.97, showing no significant phosphorus enrichment. [Conclusion] No-tillage and its combinations with biochar and bacterial biofertilizer significantly reduce nitrogen and phosphorus loss in slope farmland, demonstrating their effectiveness in controlling nitrogen and phosphorus loss on the Loess Plateau in Shanxi Province.