Fractions
Transformation and Dissipation Mechanism
of Dechlorane Plus in the Rhizosphere of the Soil–Plant System
Posted on 2020-04-10 - 10:43
The
fractions transformation and dissipation mechanism of Dechlorane
Plus (DP) in the rhizosphere of soil–plant system were investigated
and characterized by a 150-day experiment using a rhizobox system.
The depuration, accumulation, and translocation of DP in rice plants
were observed. The contributions of plant uptake, microbial degradation,
and bound-residue formation to DP dissipation under the rhizosphere
effect were modeled and quantified. The gradients of DP concentrations
correlated well with microbial biomass in the rhizosphere (R2 = 0.898). The rhizosphere facilitated the
bioavailability of DP (excitation) and modified the bound-residue
formation of DP (aging). DP concentrations in roots were positively
correlated with the labile fraction of DP in soil (R2 = 0.852–0.961). There were spatiotemporal variations
in the DP fractions. Dissolved and soil organic carbon were important
influences on fraction transformation. Contributions to total DP dissipation
were in the following ranges: microbial degradation (8.33–54.14%),
bound-residue formation (3.64–16.43%), and plant uptake (0.54–3.85%).
With all of these processes operating, the half-life of DP in the
rhizosphere was 105 days. The stereoselectivity of DP isomers in both
rice and DP fractions in soil were observed, suggesting a link between
stereoselective bioaccumulation of DP in terrestrial organisms and
dissipation pathways in soil.
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Cheng, Yu; Ding, Jue; Liang, Xiuyu; Ji, Xiaowen; Xu, Ling; Xie, Xianchuan; et al. (2020). Fractions
Transformation and Dissipation Mechanism
of Dechlorane Plus in the Rhizosphere of the Soil–Plant System. ACS Publications. Collection. https://doi.org/10.1021/acs.est.9b06748
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AUTHORS (7)
YC
Yu Cheng
JD
Jue Ding
XL
Xiuyu Liang
XJ
Xiaowen Ji
LX
Ling Xu
XX
Xianchuan Xie
YZ
You-Kuan Zhang