Extreme precipitation patterns and reductions of terrestrial ecosystem production across biomes

被引：72

作者：

Zhang, Yongguang ^{[1
,2
]}

Moran, M. Susan ^{[1
]}

Nearing, Mark A. ^{[1
]}

Campos, Guillermo E. Ponce ^{[1
]}

Huete, Alfredo R. ^{[3
]}

Buda, Anthony R. ^{[4
]}

Bosch, David D. ^{[5
]}

Gunter, Stacey A. ^{[6
]}

Kitchen, Stanley G. ^{[7
]}

McNab, W. Henry ^{[8
]}

Morgan, Jack A. ^{[9
]}

McClaran, Mitchel P. ^{[10
]}

Montoya, Diane S. ^{[11
]}

Peters, Debra P. C. ^{[12
,13
]}

Starks, Patrick J. ^{[14
]}

机构：

[1] ARS, Southwest Watershed Res Ctr, USDA, Tucson, AZ USA

[2] Free Univ Berlin, Inst Space Sci, D-12165 Berlin, Germany

[3] Univ Technol Sydney, Sydney, NSW 2007, Australia

[4] ARS, Pasture & Watershed Management Res Unit, USDA, University Pk, PA USA

[5] ARS, Southeast Watershed Res Lab, USDA, Tifton, GA USA

[6] ARS, Southern Plains Range Res Stn, USDA, Woodward, OK USA

[7] US Forest Serv, Rocky Mt Res Stn, Shrub Sci Lab, USDA, Provo, UT USA

[8] US Forest Serv, Southern Res Stn, USDA, Asheville, NC USA

[9] ARS, Crops Res Lab, Rangeland Resources Res Unit, USDA, Ft Collins, CO USA

[10] Univ Arizona, Sch Nat Resources & Environm, Tucson, AZ USA

[11] US Forest Serv, Pacific Southwest Res Stn, USDA, Arcata, CA USA

[12] ARS, USDA, Las Cruces, NM USA

[13] New Mexico State Univ, Jornada Basin Long Term Ecol Res Program, Las Cruces, NM 88003 USA

[14] ARS, Grazinglands Res Lab, USDA, El Reno, OK USA

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES | 2013年 / 118卷 / 01期

基金：

美国国家科学基金会;

关键词：

NET PRIMARY PRODUCTION; CENTRAL GRASSLAND REGION; CLIMATE EXTREMES; SOIL-WATER; VARIABILITY; FLUXES; DESERTIFICATION; CONVERGENCE; COMMUNITY; DYNAMICS;

D O I：

10.1029/2012JG002136

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Precipitation regimes are predicted to shift to more extreme patterns that are characterized by more heavy rainfall events and longer dry intervals, yet their ecological impacts on vegetation production remain uncertain across biomes in natural climatic conditions. This in situ study investigated the effects of these climatic conditions on aboveground net primary production (ANPP) by combining a greenness index from satellite measurements and climatic records during 2000-2009 from 11 long-term experimental sites in multiple biomes and climates. Results showed that extreme precipitation patterns decreased the sensitivity of ANPP to total annual precipitation (P-T) at the regional and decadal scales, leading to decreased rain use efficiency (RUE; by 20% on average) across biomes. Relative decreases in ANPP were greatest for arid grassland (16%) and Mediterranean forest (20%) and less for mesic grassland and temperate forest (3%). The cooccurrence of heavy rainfall events and longer dry intervals caused greater water stress conditions that resulted in reduced vegetation production. A new generalized model was developed using a function of both P-T and an index of precipitation extremes and improved predictions of the sensitivity of ANPP to changes in precipitation patterns. Our results suggest that extreme precipitation patterns have substantially negative effects on vegetation production across biomes and are as important as P-T. With predictions of more extreme weather events, forecasts of ecosystem production should consider these nonlinear responses to altered extreme precipitation patterns associated with climate change. Citation: Zhang, Y., et al. (2013), Extreme precipitation patterns and reductions of terrestrial ecosystem production across biomes, J. Geophys. Res. Biogeosci., 118, 148-157, doi:10.1029/2012JG002136.

引用

页码：148 / 157

页数：10

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