Depth-dependent phosphorus leaching risks in littoral soils of Lake Dianchi under extreme rainfall.
Ding L, Zhou W, Liu R, Shih K, Deng X
Soil Health
That green scum on your local lake or pond this summer may be fed not just by farm runoff, but by the very shoreline plants and soils that were supposed to stop it — and knowing which soil layers are the problem could change how we plant and amend riparian buffers everywhere.
Scientists studied the soil along the edge of a nutrient-choked lake in China, measuring how much phosphorus — the fertilizer-like nutrient that causes algae blooms — moves through different soil layers during heavy rain. They found that two zones, roughly at the surface and about a foot down, are especially 'leaky': they hold huge amounts of phosphorus but can't hold onto it when water rushes through. Even the deeper soil, which seemed safe at first, started releasing phosphorus after being waterlogged for a long time.
Key Findings
All soil layers contained extremely high total phosphorus (1.19–2.21 g per kg of soil), but the 0–10 cm and 30–40 cm layers released phosphorus the fastest and in the greatest amounts during simulated storms.
During leaching tests, phosphorus in the water leaving the soil exceeded the phosphorus in the water entering it — meaning storms mobilize both incoming runoff and phosphorus already stored in the soil.
The deepest layer tested (50–60 cm) initially absorbed phosphorus well, but released iron-bound phosphorus under prolonged waterlogged, low-oxygen conditions, indicating it provides only short-term buffering.
chevron_right Technical Summary
Soils at the edges of a heavily polluted Chinese lake hold massive stores of phosphorus that heavy rainstorms can flush into the water, worsening the algae blooms that choke the lake. Two specific soil depth zones act as 'leaky layers' that rapidly release phosphorus during storms, undermining restoration efforts.
Abstract Preview
Littoral zones and constructed riparian buffers of eutrophic lakes receive long-term non-point phosphorus (P) inputs and are widely used to buffer agricultural runoff, yet under intensifying rainfa...
open_in_new Read full abstractAbstract copyright held by the original publisher.
Was this useful?
Want to tell us more? (optional)
Thanks for the note!
Something went wrong — please try again.
Too many submissions. Try again in an hour.
Urban Tree Canopy Reduces Heat-Related Mortality by 39% in European Cities
Trees in your local park or street aren't just pretty — they are literally keeping people alive during heatwaves, and planting even a modest number of the ri...
Water quality encompasses the chemical, physical, and biological properties of water that determine its suitability for various uses and the health of aquatic ecosystems. For plant scientists, water quality is a critical research area because aquatic and wetland plants are both highly sensitive
arrow_forward Explore topic