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100 1 _ |a Li, Fayong
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245 _ _ |a Enhanced soil aggregate stability limits colloidal phosphorus loss potentials in agricultural systems
260 _ _ |a Heidelberg
|c 2020
|b Springer
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520 _ _ |a BackgroundColloid-facilitated phosphorus (P) transport is recognized as an important pathway for the loss of soil P in agricultural systems; however, information regarding soil aggregate-associated colloidal P (Pcoll) is lacking. To elucidate the effects of aggregate size on the potential loss of Pcoll in agricultural systems, soils (0–20 cm depth) from six land-use types were sampled in the Zhejiang Province in the Yangtze River Delta region, China. The aggregate size fractions (2–8 mm, 0.26–2 mm, 0.053–0.26 mm and < 0.053 mm) were separated using the wet sieving method. Colloidal P and other soil parameters in aggregates were analyzed.ResultsOur study demonstrated that 0.26–2 mm small macroaggregates had the highest total P (TP) content. In acidic soils, the highest Pcoll content was observed in the 0.26- to 2-mm-sized aggregates, while the lowest was reported in the < 0.053 mm (silt + clay)-sized particles, the opposite of that revealed in alkaline and neutral soils. Paddy soils contained less Pcoll than other land-use types. The proportion of Pcoll in total dissolved P (TDP) was dominated by < 0.053 mm (silt + clay)-sized particles. Aggregate size strongly influenced the loss potential of Pcoll in paddy soils, where Pcoll contributed up to 83% TDP in the silt + clay-sized particles. The Pcoll content was positively correlated with TP, Al, Fe, and the mean weight diameter. Aggregate-associated total carbon (TC), total nitrogen (TN), C/P, and C/N had significant negative effects on the contribution of Pcoll to potential soil P loss. The Pcoll content of the aggregates was controlled by the aggregate-associated TP and Al content, as well as the soil pH value. The potential loss of Pcoll from aggregates was controlled by its organic matter content.ConclusionWe concluded that management practices that increase soil aggregate stability or its organic carbon content will limit Pcoll loss in agricultural systems.
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700 1 _ |a Liang, Xinqiang
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700 1 _ |a Li, Hua
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700 1 _ |a Jin, Yingbin
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700 1 _ |a Jin, Junwei
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700 1 _ |a He, Miaomiao
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700 1 _ |a Klumpp, Erwin
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700 1 _ |a Bol, Roland
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773 _ _ |a 10.1186/s12302-020-0299-5
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856 4 _ |u https://juser.fz-juelich.de/record/887876/files/Enhanced%20soil%20aggregate%20stability%20limits%20colloidal%20phosphorus%20loss%20potentials%20in%20agricultural%20systems.pdf
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