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@ARTICLE{Zhang:894218,
      author       = {Zhang, Qian and Bol, Roland and Amelung, Wulf and Missong,
                      Anna and Siemens, Jan and Mulder, Ines and Willbold, Sabine
                      and Müller, Christoph and Westphal Muniz, Aleksander and
                      Klumpp, Erwin},
      title        = {{W}ater dispersible colloids and related nutrient
                      availability in {A}mazonian {T}erra {P}reta soils},
      journal      = {Geoderma},
      volume       = {397},
      issn         = {0016-7061},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2021-03107},
      pages        = {115103 -},
      year         = {2021},
      abstract     = {Amazonian Dark Earths (or terra preta de índico) are known
                      as highly fertile soils that can maintain elevated crop
                      yields for centuries. While this fertility was frequently
                      ascribed to the presence of black carbon, the availability
                      and colloidal binding of major nutrients received limited
                      attention. We examined the size distribution and the
                      elemental compositions of water-dispersible colloids (WDC)
                      in both forested and cultivated Terra Preta topsoils (0–10
                      cm, Anthrosols), as well as in their adjacent non-Terra
                      Preta controls (Acrisols) via asymmetric flow field-flow
                      fractionation (FFF). Liquid-state 31P-nuclear magnetic
                      resonance (NMR) spectra, black carbon content, and scanning
                      electron microscope (SEM) images were also obtained. We
                      found that WDC in Terra Preta soils contained a significant
                      proportion of organo-mineral associations in the size range
                      30–300 nm, whereas, in contrast, water-dispersible
                      nanoparticles with a diameter < 30 nm were dominant in the
                      adjacent Acrisols. The shifts to larger WDC sizes in the
                      Terra Preta soils went along with elevated pH values, as
                      well as with elevated contents of Si, Al, Fe, Ca and organic
                      matter-containing particles. Also P concentrations were
                      enriched in both the water-extractable phase (WEP) and WDC
                      extracts of Terra Preta soils relative to the adjacent
                      Acrisols. We assume that the higher pH values and Ca ion
                      concentrations promoted the involvement of soil organic
                      matter (SOM) into the formation of larger-sized colloids
                      consisting of kaolinite-like clay minerals, iron oxides and
                      Ca ions in the Terra Preta soils. The elevated content of Ca
                      in Terra Preta soil colloids may also contribute to the
                      retention of P, likely via bridging of anionic P like
                      orthophosphate to SOM. Preventing soil acidification is thus
                      not only to be recommended for Acrisols, but also for
                      maintaining colloidal structures and related fertility in
                      Terra Preta soils.},
      cin          = {ZEA-3 / IBG-3},
      ddc          = {910},
      cid          = {I:(DE-Juel1)ZEA-3-20090406 / I:(DE-Juel1)IBG-3-20101118},
      pnm          = {2151 - Terrestrial ecosystems of the future (POF4-215) /
                      2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217)},
      pid          = {G:(DE-HGF)POF4-2151 / G:(DE-HGF)POF4-2173},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000655075600012},
      doi          = {10.1016/j.geoderma.2021.115103},
      url          = {https://juser.fz-juelich.de/record/894218},
}