Stoichiometry of soil enzyme activity at global scale

Ecology Letters - Tập 11 Số 11 - Trang 1252-1264 - 2008
Robert L. Sinsabaugh1, Christian L. Lauber1, Michael Weintraub2, Bony Ahmed3, Steven D. Allison4, Chelsea L. Crenshaw1, Alexandra R. Contosta5, Daniela Cusack6, Serita D. Frey5, Marcy E. Gallo1, Tracy B. Gartner7, Sarah E. Hobbie8, Keri Holland9, Bonnie L. Keeler8, Jennifer S. Powers10, Martina Štursová1, Cristina Takacs‐Vesbach1, Mark P. Waldrop11, Matthew D. Wallenstein12, Donald R. Zak13, Lydia H. Zeglin1
1Department of Biology, University of New Mexico, Albuquerque, NM 87131, USA,
2Department of Environmental Sciences, University of Toledo, Toledo, OH 43606-3390, USA
3School of Life Sciences, Arizona State University, Tempe, AZ, 85281, USA
4Departments of Ecology and Evolutionary Biology and Earth System Science, University of California, Irvine, CA 92697, USA
5Department of Natural Resources, University of New Hampshire, Durham, NH 03824, USA
6Department of Environmental Science, Policy and Management, University of California, Berkeley, Berkeley, CA, 94720, USA
7Department of Biology and the Environmental Science Program, Carthage College, 2001 Alford Park Drive, Kenosha, WI 53140, USA
8Department of Ecology, Evolution and Behavior, University of Minnesota, 1987 Upper Buford Circle, St. Paul, MN 55108, USA
9Department of Ecology, Evolution, and Marine Biology, University of California Santa Barbara, Santa Barbara, CA 93106, USA
10Departments of Ecology, Evolution & Behavior, Plant Biology and Soil, Water & Climate, University of Minnesota, 1987 Upper Buford Circle, St Paul, MN 55108, USA
11United States Geological Survey, 345 Middlefield Rd, MS 962, Menlo Park, CA 94025, USA
12Natural Resource Ecology Laboratory, Colorado State University, Campus Delivery 1499, Fort Collins, CO 80523-1499, USA
13School of Natural Resources, Univ. of Michigan, Ann Arbor, MI 48109-1115, USA.

Tóm tắt

Abstract

Extracellular enzymes are the proximate agents of organic matter decomposition and measures of these activities can be used as indicators of microbial nutrient demand. We conducted a global‐scale meta‐analysis of the seven‐most widely measured soil enzyme activities, using data from 40 ecosystems. The activities of β‐1,4‐glucosidase, cellobiohydrolase, β‐1,4‐N‐acetylglucosaminidase and phosphatase g−1 soil increased with organic matter concentration; leucine aminopeptidase, phenol oxidase and peroxidase activities showed no relationship. All activities were significantly related to soil pH. Specific activities, i.e. activity g−1 soil organic matter, also varied in relation to soil pH for all enzymes. Relationships with mean annual temperature (MAT) and precipitation (MAP) were generally weak. For hydrolases, ratios of specific C, N and P acquisition activities converged on 1 : 1 : 1 but across ecosystems, the ratio of C : P acquisition was inversely related to MAP and MAT while the ratio of C : N acquisition increased with MAP. Oxidative activities were more variable than hydrolytic activities and increased with soil pH. Our analyses indicate that the enzymatic potential for hydrolyzing the labile components of soil organic matter is tied to substrate availability, soil pH and the stoichiometry of microbial nutrient demand. The enzymatic potential for oxidizing the recalcitrant fractions of soil organic material, which is a proximate control on soil organic matter accumulation, is most strongly related to soil pH. These trends provide insight into the biogeochemical processes that create global patterns in ecological stoichiometry and organic matter storage.

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Ecology Letters

Tập 11 Số 11

1252-1264

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