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Sample storage-induced changes in the quantity and quality of soil labile organic carbon.

Sun SQ, Cai HY, Chang SX, Bhatti JS - Sci Rep (2015)

Bottom Line: We studied the effects of air-drying and frozen storage on cold and hot water soluble organic carbon (WSOC).Air-drying but not frozen storage increased the concentrations of cold-WSOC and carbohydrate in cold-WSOC, while both increased polyphenol concentrations.In contrast, only polyphenol concentration in hot-WSOC was increased by air-drying and frozen storage, suggesting that hot-WSOC was less affected by sample storage.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, No. 9, Block 4, South Renmin Rd., Chengdu, 610041 China.

ABSTRACT
Effects of sample storage methods on the quantity and quality of labile soil organic carbon are not fully understood even though their effects on basic soil properties have been extensively studied. We studied the effects of air-drying and frozen storage on cold and hot water soluble organic carbon (WSOC). Cold- and hot-WSOC in air-dried and frozen-stored soils were linearly correlated with those in fresh soils, indicating that storage proportionally altered the extractability of soil organic carbon. Air-drying but not frozen storage increased the concentrations of cold-WSOC and carbohydrate in cold-WSOC, while both increased polyphenol concentrations. In contrast, only polyphenol concentration in hot-WSOC was increased by air-drying and frozen storage, suggesting that hot-WSOC was less affected by sample storage. The biodegradability of cold- but not hot-WSOC was increased by air-drying, while both air-drying and frozen storage increased humification index and changed specific UV absorbance of both cold- and hot-WSOC, indicating shifts in the quality of soil WSOC. Our results suggest that storage methods affect the quantity and quality of WSOC but not comparisons between samples, frozen storage is better than air-drying if samples have to be stored, and storage should be avoided whenever possible when studying the quantity and quality of both cold- and hot-WSOC.

No MeSH data available.


Related in: MedlinePlus

The SUVA254 and HIX values and biodegradability of cold- andhot-WSOC (mean ± SE): (a) SUVA254 values of cold-WSOC;(b) SUVA254 values of hot-WSOC; (c) HIX of cold-WSOC; (d) HIX ofhot-WSOC; (e) Biodegradability of cold-WSOC; and (f) Biodegradability ofhot-WSOC.FS, fresh soil; AD, air-dried soil; FZ, frozen-stored soil; WSOC, watersoluble organic carbon.
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f3: The SUVA254 and HIX values and biodegradability of cold- andhot-WSOC (mean ± SE): (a) SUVA254 values of cold-WSOC;(b) SUVA254 values of hot-WSOC; (c) HIX of cold-WSOC; (d) HIX ofhot-WSOC; (e) Biodegradability of cold-WSOC; and (f) Biodegradability ofhot-WSOC.FS, fresh soil; AD, air-dried soil; FZ, frozen-stored soil; WSOC, watersoluble organic carbon.

Mentions: Air-drying and frozen storage decreased the specific UV absorbance at 254 nm(SUVA254) of cold-WSOC (P < 0.001), withthe lowest SUVA254 in the air-dried, followed by the frozen-storedand then the fresh samples (Fig. 3a). In contrast,air-drying (P = 0.043) and frozen storage(P = 0.013) resulted in a significantincrease in SUVA254 of hot-WSOC (Fig. 3b). Thehumification index (HIX) in both the cold- and hot-WSOC was significantlyincreased by air-drying (cold- and hot-WSOC:P < 0.001) and frozen storage (cold-WSOC:P < 0.001; hot-WSOC:P = 0.006), with the highest value in theair-dried soils, followed by the frozen-stored and then by the fresh soilsamples (Fig. 3c,d).


Sample storage-induced changes in the quantity and quality of soil labile organic carbon.

Sun SQ, Cai HY, Chang SX, Bhatti JS - Sci Rep (2015)

The SUVA254 and HIX values and biodegradability of cold- andhot-WSOC (mean ± SE): (a) SUVA254 values of cold-WSOC;(b) SUVA254 values of hot-WSOC; (c) HIX of cold-WSOC; (d) HIX ofhot-WSOC; (e) Biodegradability of cold-WSOC; and (f) Biodegradability ofhot-WSOC.FS, fresh soil; AD, air-dried soil; FZ, frozen-stored soil; WSOC, watersoluble organic carbon.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4663495&req=5

f3: The SUVA254 and HIX values and biodegradability of cold- andhot-WSOC (mean ± SE): (a) SUVA254 values of cold-WSOC;(b) SUVA254 values of hot-WSOC; (c) HIX of cold-WSOC; (d) HIX ofhot-WSOC; (e) Biodegradability of cold-WSOC; and (f) Biodegradability ofhot-WSOC.FS, fresh soil; AD, air-dried soil; FZ, frozen-stored soil; WSOC, watersoluble organic carbon.
Mentions: Air-drying and frozen storage decreased the specific UV absorbance at 254 nm(SUVA254) of cold-WSOC (P < 0.001), withthe lowest SUVA254 in the air-dried, followed by the frozen-storedand then the fresh samples (Fig. 3a). In contrast,air-drying (P = 0.043) and frozen storage(P = 0.013) resulted in a significantincrease in SUVA254 of hot-WSOC (Fig. 3b). Thehumification index (HIX) in both the cold- and hot-WSOC was significantlyincreased by air-drying (cold- and hot-WSOC:P < 0.001) and frozen storage (cold-WSOC:P < 0.001; hot-WSOC:P = 0.006), with the highest value in theair-dried soils, followed by the frozen-stored and then by the fresh soilsamples (Fig. 3c,d).

Bottom Line: We studied the effects of air-drying and frozen storage on cold and hot water soluble organic carbon (WSOC).Air-drying but not frozen storage increased the concentrations of cold-WSOC and carbohydrate in cold-WSOC, while both increased polyphenol concentrations.In contrast, only polyphenol concentration in hot-WSOC was increased by air-drying and frozen storage, suggesting that hot-WSOC was less affected by sample storage.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, No. 9, Block 4, South Renmin Rd., Chengdu, 610041 China.

ABSTRACT
Effects of sample storage methods on the quantity and quality of labile soil organic carbon are not fully understood even though their effects on basic soil properties have been extensively studied. We studied the effects of air-drying and frozen storage on cold and hot water soluble organic carbon (WSOC). Cold- and hot-WSOC in air-dried and frozen-stored soils were linearly correlated with those in fresh soils, indicating that storage proportionally altered the extractability of soil organic carbon. Air-drying but not frozen storage increased the concentrations of cold-WSOC and carbohydrate in cold-WSOC, while both increased polyphenol concentrations. In contrast, only polyphenol concentration in hot-WSOC was increased by air-drying and frozen storage, suggesting that hot-WSOC was less affected by sample storage. The biodegradability of cold- but not hot-WSOC was increased by air-drying, while both air-drying and frozen storage increased humification index and changed specific UV absorbance of both cold- and hot-WSOC, indicating shifts in the quality of soil WSOC. Our results suggest that storage methods affect the quantity and quality of WSOC but not comparisons between samples, frozen storage is better than air-drying if samples have to be stored, and storage should be avoided whenever possible when studying the quantity and quality of both cold- and hot-WSOC.

No MeSH data available.


Related in: MedlinePlus