Abstract
The combined role of ground cover management in controlling soil erosion and nutrient loss from new orchards is still less understood. In this study, four ground cover management practices, orchard with grass cover (OG), orchard with interplant cover (OI), orchard with straw cover (OS), and orchard with bare ground (OB), were designed to identify their impacts on soil erosion and associated carbon–nitrogen-phosphorus loss in new orchards by rainfall simulation tests with rainfall intensities of 60, 90, and 120 mm h−1 and 90 min rainfall duration. The results showed that OS had the lowest surface flow coefficient (6.6%) and highest subsurface flow coefficient (32.5%). The highest soil loss rate occurred in the OB plot (65.4 g m−2 min−1), and the lowest soil loss rate occurred in the OS plot (0.5 g m−2 min−1). OS plot showed better effectiveness in improving soil erosion. However, the increased infiltration capacity was facilitated in terms of causing non-point source pollution. The C-N-P ratios of surface flow in different cover measures (OB, OI, OG, and OS) were 1.4:1.2:0.9:1, 1.8:1.7:1.2:1, and 2.3:1.9:1.2:1, respectively. The ratios of sediment in different cover measures were 7.3:9:2.3:1, 2:1.5:1.2:1, and 1.2:1:0.8:0.7, respectively. Cover management plots play an active role in reducing nutrient loss in surface flow and sediment, but the increased infiltration in covered management plots is associated with the risk of groundwater contamination in subsurface flow. The C-N-P ratios of subsurface flow in OB and covered managed plots (OI, OG, and OS) were 1:3.3:1.6:2.7, 1:1.5:2.2:2.4 and 1:1.2:1.5:1.3, respectively. Therefore, when managing the phenomenon of soil erosion through ground cover measures, attention should also be focused on the function of cover measures in regulating non-point source pollution underground, such as subsurface flow. This research recommends a combination of cover management measures to further mitigate erosion and the risk of groundwater contamination.
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Funding
This work was supported by the National Natural Science Foundation of China (grant nos. U22A20611, 42377336, 42107378), the Jiangxi Water Conservancy Science and Technology Major Project (202224ZDKT12), the Hunan Water Conservancy Science and Technology Extension Project (XSKJ2022068-47).
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LT: writing: original draft, visualization, conceptualization, methodology, formal analysis. YL: runoff plot preparation and pretreatment, writing—review and editing, supervision. YM: writing—review and editing, investigation. JD: conceptualization, methodology, investigation. YD and FC: data collection, investigation. HZ and ZL: methodology, investigation.
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Tian, L., Liu, Y., Ma, Y. et al. Combined role of ground cover management in altering orchard surface‒subsurface erosion and associated carbon–nitrogen-phosphorus loss. Environ Sci Pollut Res 31, 5655–5667 (2024). https://doi.org/10.1007/s11356-023-31535-z
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DOI: https://doi.org/10.1007/s11356-023-31535-z