Experimental Air Warming of a Stylosanthes capitata, Vogel Dominated Tropical Pasture Affects Soil Respiration and Nitrogen Dynamics

被引:27
作者
Gonzalez-Meler, Miquel A. [1 ]
Silva, Lais B. C. [2 ]
Dias-De-Oliveira, Eduardo [2 ]
Flower, Charles E. [1 ]
Martinez, Carlos A. [2 ]
机构
[1] Univ Illinois, Dept Biol Sci, Ecol & Evolut, Chicago, IL 60607 USA
[2] Univ Sao Paulo, Dept Biol, Ribeirao Preto, Brazil
来源
FRONTIERS IN PLANT SCIENCE | 2017年 / 8卷
基金
巴西圣保罗研究基金会;
关键词
nitrogen; stable isotopes; warming; soil respiration; temperature; tropic; pasture; productivity; CARBON-DIOXIDE EFFLUX; CLIMATE-CHANGE; WATER-CONTENT; TEMPERATURE SENSITIVITY; ELEVATED CO2; FOREST; RESPONSES; EXCHANGE; PLANT; PHOTOSYNTHESIS;
D O I
10.3389/fpls.2017.00046
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Warming due to global climate change is predicted to reach 2 degrees C in tropical latitudes. There is an alarming paucity of information regarding the effects of air temperature on tropical agroecosystems, including foraging pastures. Here, we investigated the effects of a 2 degrees C increase in air temperature over ambient for 30 days on an established tropical pasture (Ribeirao Preto, SAo Paulo, Brazil) dominated by the legume Stylosanthes capitata Vogel, using a T-FACE (temperature free-air controlled enhancement) system. We tested the effects of air warming on soil properties [carbon (C), nitrogen (N), and their stable isotopic levels (delta C-13 and delta N-15), as well as soil respiration and soil enzymatic activity] and aboveground characteristics (foliar C, N, delta C-13, delta N-15, leaf area index, and aboveground biomass) under field conditions. Results show that experimental air warming moderately increased soil respiration rates compared to ambient temperature. Soil respiration was positively correlated with soil temperature and moisture during mid-day (when soil respiration was at its highest) but not at dusk. Foliar delta C-13 were not different between control and elevated temperature treatments, indicating that plants grown in warmed plots did not show the obvious signs of water stress often seen in warming experiments. The N-15 isotopic composition of leaves from plants grown at elevated temperature was lower than in ambient plants, suggesting perhaps a higher proportion of N-fixation contributing to tissue N in warmed plants when compared to ambient ones. Soil microbial enzymatic activity decreased in response to the air warming treatment, suggesting a slower decomposition of organic matter under elevated air temperature conditions. Decreased soil enzyme capacity and increases in soil respiration and plant biomass in plots exposed to high temperature suggest that increased root activity may have caused the increase seen in soil respiration in this tropical pasture. This response along with rapid changes in soil and plant 15N may differ from what has been shown in temperate grasslands.
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页数:10
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共 67 条
  • [1] Is stimulation of leaf photosynthesis by elevated carbon dioxide concentration maintained in the long term?: A test with Lolium perenne grown for 10 years at two nitrogen fertilization levels under Free Air CO2 Enrichment (FACE)
    Ainsworth, EA
    Davey, PA
    Hymus, GJ
    Osborne, CP
    Rogers, A
    Blum, H
    Nösberger, J
    Long, SP
    [J]. PLANT CELL AND ENVIRONMENT, 2003, 26 (05) : 705 - 714
  • [2] Soil-carbon response to warming dependent on microbial physiology
    Allison, Steven D.
    Wallenstein, Matthew D.
    Bradford, Mark A.
    [J]. NATURE GEOSCIENCE, 2010, 3 (05) : 336 - 340
  • [3] Climate change will increase savannas at the expense of forests and treeless vegetation in tropical and subtropical Americas
    Anadon, Jose D.
    Sala, Osvaldo E.
    Maestre, Fernando T.
    [J]. JOURNAL OF ECOLOGY, 2014, 102 (06) : 1363 - 1373
  • [4] Seasonal patterns and control factors of CO2 effluxes from surface litter, soil organic carbon, and root-derived carbon estimated using radiocarbon signatures
    Atarashi-Andoh, Mariko
    Koarashi, Jun
    Ishizuka, Shigehiro
    Hirai, Keizo
    [J]. AGRICULTURAL AND FOREST METEOROLOGY, 2012, 152 : 149 - 158
  • [5] Does photosynthesis affect grassland soil-respired CO2 and its carbon isotope composition on a diurnal timescale?
    Bahn, Michael
    Schmitt, Michael
    Siegwolf, Rolf
    Richter, Andreas
    Brueggemann, Nicolas
    [J]. NEW PHYTOLOGIST, 2009, 182 (02) : 451 - 460
  • [6] A meta-analysis of experimental warming effects on terrestrial nitrogen pools and dynamics
    Bai, Edith
    Li, Shanlong
    Xu, Wenhua
    Li, Wei
    Dai, Weiwei
    Jiang, Ping
    [J]. NEW PHYTOLOGIST, 2013, 199 (02) : 441 - 451
  • [7] Labile, recalcitrant, and microbial carbon and nitrogen pools of a tallgrass prairie soil in the US Great Plains subjected to experimental warming and clipping
    Belay-Tedla, Asfaw
    Zhou, Xuhui
    Su, Bo
    Wan, Shiqiang
    Luo, Yiqi
    [J]. SOIL BIOLOGY & BIOCHEMISTRY, 2009, 41 (01) : 110 - 116
  • [8] Belnap J, 2001, ECOL STU AN, V150, P241
  • [9] Burns RG., 2002, ENZYMES ENV ACTIVITY
  • [10] Enzyme activities as a component of soil biodiversity: A review
    Caldwell, BA
    [J]. PEDOBIOLOGIA, 2005, 49 (06) : 637 - 644