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91.
92.
Transport of molybdenum in a biosolid-amended alkaline soil 总被引:3,自引:0,他引:3
The transport of molybdenum (Mo) in a biosolid-amended, alkaline, agricultural soil was examined in the research reported herein. Batch-equilibrium and miscible-displacement experiments were conducted to examine the transport of Mo in soil with and without 10% by weight biosolid amendment. The results of geochemical modeling, conducted using PHREEQC, indicated that no mineral dissolution or precipitation reactions were expected for the system under the prevailing conditions. Sorption equilibrium coefficients (Kd) obtained from moment analysis of the Mo breakthrough curves were similar to those calculated from the results of the batch-equilibrium experiments. Mo sorption was greater for the biosolid-amended soil (Kd of 1.3 versus 0.35). Sorption of Mo was shown to be linear, rate limited, and reversible for both unamended and amended soil. The results suggest that Mo associated with biosolid-amended soils is relatively bioavailable and mobile. 相似文献
93.
John M. Carroll Bradley J. Peterson Dennis Bonal Andrew Weinstock Christopher F. Smith Stephen T. Tettelbach 《Marine Biology》2010,157(2):249-259
Eelgrass, Zostera marina, is generally regarded as the preferred habitat of bay scallops, but in some cases scallop populations have persisted or
increased in areas lacking eelgrass. This suggests that some other substrate(s) may serve important ecological functions for
bay scallops. One candidate is Codium fragile, a macroalgal species with which bay scallops are known to associate and in which we commonly find juvenile and adult bay
scallops in eastern Long Island, New York. In this study, we examined whether survival of planted bay scallops differed in
Codium, eelgrass, and Codium + eelgrass substrates at two sites during August and October of 2 years. Survival of tethered scallops and recoveries of
live free-planted individuals varied with scallop size, planting season and year, but no differences were observed between
the three substrates for a given scallop size and planting date. Crab (particularly Dyspanopeus
sayi) and whelk predation were implicated as important causes of tethered scallop mortalities while emigration and removal by
predators likely contributed to scallop losses. Densities of naturally recruited 0+ years scallops recovered by visual and
suction dredge sampling were similar in the eelgrass and Codium substrates. While our results suggest that Codium may offer some degree of predation refuge for bay scallops, further work needs to weigh the potential disadvantages of this
substrate (such as low DO levels, potential attachment and transport of scallops, and differences in current flow, food availability
and sedimentation relative to eelgrass) to determine if Codium may serve as a valuable habitat for bay scallops throughout their lifespan. 相似文献
94.
95.
Xiaoge Huang Lihao Chen Ziqi Ma Kenneth C. Carroll Xiao Zhao Zailin Huo 《Frontiers of Environmental Science & Engineering》2022,16(12):151