Inter-regional comparison of land-use effects on stream metabolism

被引：276

作者：

Bernot, Melody J. ^{[1
]}

Sobota, Daniel J. ^{[2
,3
]}

Hall, Robert O., Jr. ^{[4
]}

Mulholland, Patrick J. ^{[5
]}

Dodds, Walter K. ^{[6
]}

Webster, Jackson R. ^{[7
]}

Tank, Jennifer L. ^{[8
]}

Ashkenas, Linda R. ^{[2
]}

Cooper, Lee W. ^{[9
]}

Dahm, Clifford N. ^{[10
]}

Gregory, Stanley V. ^{[2
]}

Grimm, Nancy B. ^{[11
]}

Hamilton, Stephen K. ^{[12
]}

Johnson, Sherri L. ^{[13
]}

Mcdowell, William H. ^{[14
]}

Meyer, Judith L. ^{[15
]}

Peterson, Bruce ^{[16
]}

Poole, Geoffrey C. ^{[17
]}

Valett, H. Maurice ^{[7
]}

Arango, Clay ^{[8
]}

Beaulieu, Jake J. ^{[8
]}

Burgin, Amy J. ^{[12
]}

Crenshaw, Chelsea ^{[10
]}

Helton, Ashley M. ^{[15
]}

Johnson, Laura ^{[8
]}

Merriam, Jeff ^{[14
]}

Niederlehner, B. R. ^{[7
]}

O'Brien, Jonathan M. ^{[12
]}

Potter, Jody D. ^{[14
]}

Sheibley, Richard W. ^{[10
,11
,18
]}

Thomas, Suzanne M. ^{[16
]}

Wilson, Kym ^{[6
]}

机构：

[1] Ball State Univ, Dept Biol, Muncie, IN 47306 USA

[2] Oregon State Univ, Dept Fisheries & Wildlife, Corvallis, OR 97331 USA

[3] Washington State Univ, Sch Earth & Environm Sci, Vancouver, WA 98686 USA

[4] Univ Wyoming, Dept Zool & Physiol, Laramie, WY 82071 USA

[5] Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA

[6] Kansas State Univ, Div Biol, Manhattan, KS 66506 USA

[7] Virginia Tech, Dept Biol Sci, Blacksburg, VA 24061 USA

[8] Univ Notre Dame, Dept Biol Sci, Notre Dame, IN 46556 USA

[9] Univ Maryland, Chesapeake Biol Lab, Ctr Environm Sci, Solomons, MD 20688 USA

[10] Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA

[11] Arizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA

[12] Michigan State Univ, Kellogg Biol Stn, Hickory Corners, MI 49060 USA

[13] US Forest Serv, Pacific NW Res Stn, Corvallis, OR 97331 USA

[14] Univ New Hampshire, Dept Nat Resources & Environm, Durham, NH 03824 USA

[15] Univ Georgia, Inst Ecol, Athens, GA 30602 USA

[16] Marine Biol Lab, Ctr Ecosyst, Woods Hole, MA 02543 USA

[17] Montana State Univ, Dept Land Resources & Environm Sci, Bozeman, MT 59717 USA

[18] USGS Washington Water Sci Ctr, Tacoma, WA 98402 USA

来源：

FRESHWATER BIOLOGY | 2010年 / 55卷 / 09期

基金：

美国国家科学基金会;

关键词：

ecosystem respiration; land use; metabolism; primary production; stream; NITRATE REMOVAL; TROPHIC STATE; ECOSYSTEM; PATTERNS; FLOW; RESPIRATION; LIMITATION; LANDSCAPE; RESPONSES; FOREST;

D O I：

10.1111/j.1365-2427.2010.02422.x

中图分类号：

Q14 [生态学（生物生态学）];

学科分类号：

071012 ; 0713 ;

摘要：

P>1. Rates of whole-system metabolism (production and respiration) are fundamental indicators of ecosystem structure and function. Although first-order, proximal controls are well understood, assessments of the interactions between proximal controls and distal controls, such as land use and geographic region, are lacking. Thus, the influence of land use on stream metabolism across geographic regions is unknown. Further, there is limited understanding of how land use may alter variability in ecosystem metabolism across regions. 2. Stream metabolism was measured in nine streams in each of eight regions (n = 72) across the United States and Puerto Rico. In each region, three streams were selected from a range of three land uses: agriculturally influenced, urban-influenced, and reference streams. Stream metabolism was estimated from diel changes in dissolved oxygen concentrations in each stream reach with correction for reaeration and groundwater input. 3. Gross primary production (GPP) was highest in regions with little riparian vegetation (sagebrush steppe in Wyoming, desert shrub in Arizona/New Mexico) and lowest in forested regions (North Carolina, Oregon). In contrast, ecosystem respiration (ER) varied both within and among regions. Reference streams had significantly lower rates of GPP than urban or agriculturally influenced streams. 4. GPP was positively correlated with photosynthetically active radiation and autotrophic biomass. Multiple regression models compared using Akaike's information criterion (AIC) indicated GPP increased with water column ammonium and the fraction of the catchment in urban and reference land-use categories. Multiple regression models also identified velocity, temperature, nitrate, ammonium, dissolved organic carbon, GPP, coarse benthic organic matter, fine benthic organic matter and the fraction of all land-use categories in the catchment as regulators of ER. 5. Structural equation modelling indicated significant distal as well as proximal control pathways including a direct effect of land-use on GPP as well as SRP, DIN, and PAR effects on GPP; GPP effects on autotrophic biomass, organic matter, and ER; and organic matter effects on ER. 6. Overall, consideration of the data separated by land-use categories showed reduced inter-regional variability in rates of metabolism, indicating that the influence of agricultural and urban land use can obscure regional differences in stream metabolism.

引用

页码：1874 / 1890

页数：17

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