Full TGIF Record # 168694
Item 1 of 1
DOI:10.1016/j.soilbio.2009.03.020
Web URL(s):http://www.sciencedirect.com/science/article/pii/S003807170900128X
    Last checked: 01/31/2014
    Access conditions: Item is within a limited-access website
Publication Type:
i
Refereed
Author(s):Yao, Huaiying; Bowman, Daniel; Rufty, Thomas; Shi, Wei
Author Affiliation:Yao and Shi: Soil Science Department; Yao: Environmental and Resource Sciences, Zhejiang University, Zhejiang, China; Bowman and Rufty: Crop Science Department, North Carolina State University, Raleigh, NC
Title:Interactions between N fertilization, grass clipping addition and pH in turn ecosystems: Implications for soil enzyme activities and organic matter decomposition
Source:Soil Biology & Biochemistry. Vol. 41, No. 7, 2009, p. 1425-1432.
Publishing Information:Pergamon
# of Pages:8
Keywords:TIC Keywords: Carbon sequestration; Mineralization; Nitrogen fertilization; Decomposition; Phenol oxidase; Soil enzymes; Soil pH
Abstract/Contents:Turf has been acknowledged as an important ecosystem with potential for soil C sequestration. As a major process dictating soil C storage, organic matter decomposition has received little attention in turf systems. Given that soil enzyme-catalyzed biochemical reactions are the rate limiting steps of organic matter decomposition, we examined the activities of oxidative and hydrolytic soil enzymes and their relations with soluble organic compounds and soil C and N mineralization in two turf chronosequences with contrasting soil pH and in response to N fertilization and grass clipping addition. In comparison with turf ecosystems under acidic soil, phenol oxidase activity was about two-fold greater in turf ecosystems under alkaline soil and positively correlated to about two-fold differences in soluble phenolics and dissolved organic C between alkaline and acidic soils. However, the activities of hydrolytic enzymes including cellulase, chitinase, and glucosidase were lower in alkaline soil. It appears that the high concentration of soluble phenolics inhibited the activities of hydrolytic enzymes that in turn limited the decomposition of dissolved organic C and resulted in its accumulation in alkaline soil. Nitrogen mineralization was comparable between alkaline and acidic soils, but CO2 evolution was about two-fold greater in alkaline soil, possibly due to considerable abiotic carbonate dissolution. We observed that mineral N input at 60 mg N kg-1 soil had very minor negative effects on the activities of both phenol oxidase and hydrolytic enzymes. Grass clipping addition did not affect the activity of phenol oxidase, but increased the activities of soil chitinase, cellulase, glucosidase, and glucosaminidase by up to 20% and also soluble phenolics in soil by about 10%. Our results suggest that soil phenol oxidase might regulate the activities of hydrolytic soil enzymes via its control on soluble phenolics and function as an enzymatic latch to hold soil organic C in highly managed turf ecosystems. While soil pH is important to affect phenol oxidase activity and therefore decomposition, management practices, i.e., N fertilization and grass clipping addition may indirectly affect the decomposition through enhancing turfgrass productivity and thus soil C input.
Language:English
References:61
Note:Tables
Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Yao, H., D. Bowman, T. Rufty, and W. Shi. 2009. Interactions between N fertilization, grass clipping addition and pH in turn ecosystems: Implications for soil enzyme activities and organic matter decomposition. Soil Biol. Biochem. 41(7):p. 1425-1432.
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DOI: 10.1016/j.soilbio.2009.03.020
Web URL(s):
http://www.sciencedirect.com/science/article/pii/S003807170900128X
    Last checked: 01/31/2014
    Access conditions: Item is within a limited-access website
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MSU catalog number: b2217194
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