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| Warming effects on plant biomass allocation and correlations with the soil environment in an alpine meadow, China |
| XU Manhou1*, LIU Min1, XUE Xian2, ZHAI Datong1 |
1 Taiyuan Normal University, Jinzhong 030619, China;
2 Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000,China |
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Abstract Alpine meadow ecosystem is fragile and highly sensitive to climate change. An understanding of the allocation of above- and below-ground plant biomass and correlations with environmental factors in alpine meadow ecosystem can result in better protection and effective utilization of alpine meadow vegetation. We chose an alpine meadow in the Qinghai-Tibetan Plateau of China as the study area and designed experimental warming plots using a randomized block experimental design. We used single-tube infrared radiators as warming devices, established the warming treatments, and measured plant above- (AGB) and below-ground biomass (BGB) during the growing seasons (May to September) in 2012 and 2013. We determined the allocation of biomass and the relationship between biomass and soil environment under the warming treatment. Biomass indices including above-ground biomass, below-ground biomass and the ratio of root to shoot (R/S), and soil factors including soil moisture and soil temperature at different depths were measured. The results showed that (1) BGB of the alpine meadow had the most significant allometric correlation with its AGB (y=298.7x0.44, P<0.001), but the relationship decreased under warming treatment and the determination coefficient of the functional equation was 0.102 which was less than that of 0.188 of the unwarming treatment (control); (2) BGB increased, especially in the deeper soil layers under warming treatment (P>0.05). At 0–10 cm soil depth, the percentages of BGB under warming treatment were smaller than those of the control treatment with the decreases being 8.52% and 8.23% in 2012 and 2013, respectively. However, the BGB increased 2.13% and 2.06% in 2012 and 2013, respectively, at 10–50 cm soil depths; (3) BGB had significant positive correlations with soil moisture at 100 cm depth and with soil temperature at 20–100 cm depths (P<0.05), but the mean correlation coefficient of soil temperature was 0.354, greater than the 0.245 of soil moisture. R/S ratio had a significant negative correlation with soil temperature at 20 cm depth (P<0.05). The warmer soil temperatures in shallow layers increased the biomass allocation to above-ground plant parts, which leading to the increase in AGB; whereas the enhanced thawing of frozen soil in deep layers causing by warming treatment produced more moisture that affected plant biomass allocation.
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Received: 31 October 2015
Published: 15 June 2016
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| Fund: This study was funded by the National Natural Science Foundation of China (41501219). |
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Corresponding Authors:
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| Aerts R. 2006. The freezer defrosting: global warming and litter decomposition rates in cold biomes. Journal of Ecology, 94(4): 713–724. Alfaro-Sánchez R, López-Serrano F R, Rubio E, et al. 2015. Response of biomass allocation patterns to thinning in Pinus halepensis differs under dry and semiarid Mediterranean climates. Annals of Forest Science, 72(5): 595–607. Carlyle C N, Fraser L H, Turkington R. 2014. Response of grassland biomass production to simulated climate change and clipping along an elevation gradient. Oecologia, 174(3): 1065–1073. Cunniff J, Purdy S J, Barraclough T J P, et al. 2015. High yielding biomass genotypes of willow (Salix spp.) show differences in below ground biomass allocation. Biomass and Bioenergy, 80: 114–127. De Boeck H J, Lemmens C H H M, Gielen H, et al. 2007. Combined effects of climate warming and plant diversity loss on above- and below-ground grassland productivity. Environmental and Experimental Botany, 60(1): 95–104. Dubrovsky J G, North G B, Nobel P S. 1998. Root growth, developmental changes in the apex, and hydraulic conductivity for Opuntia ficus-indica during drought. New Phytologist, 138(1): 75–82. Dusseux P, Hubert-Moy L, Corpetti T, et al. 2015. Evaluation of SPOT imagery for the estimation of grassland biomass. International Journal of Applied Earth Observation and Geoinformation, 38: 72–77. Edwards E J, Benham D G, Marland L A, et al. 2004. Root production is determined by radiation flux in a temperate grass land community. Global Change Biology, 10(2): 209–227. Enquist B J, Niklas K J. 2002. Global allocation rules for patterns of biomass partitioning in seed plants. Science, 295(5559): 1517–1520. Fan J W, Wang K, Harris W, et al. 2009. Allocation of vegetation biomass across a climate-related gradient in the grasslands of Inner Mongolia. Journal of Arid Environments, 73(4–5): 521–528. Freschet G T, Kichenin E, Wardle D A. 2015. Explaining within-community variation in plant biomass allocation: a balance between organ biomass and morphology above vs below ground? Journal of Vegetation Science, 26(3): 431–440. Gong X Y, Fanselow N, Dittert K, et al. 2015. Response of primary production and biomass allocation to nitrogen and water supplementation along a grazing intensity gradient in semiarid grassland. European Journal of Agronomy, 63: 27–35. Gutiérrez J L, Jones C G. 2006. Physical ecosystem engineers as agents of biogeochemical heterogeneity. BioScience, 56(3): 227–236. Hollingsworth T N, Schuur E A G, Chapin III F S, et al. 2008. Plant community composition as a predictor of regional soil carbon storage in Alaskan boreal black spruce ecosystems. Ecosystems, 11(4): 629–642. Hovenden M J, Newton P C D, Wills K E. 2014. Seasonal not annual rainfall determines grassland biomass response to carbon dioxide. Nature, 511(7511): 583–586. Ichihashi R, Tateno M. 2015. Biomass allocation and long-term growth patterns of temperate lianas in comparison with trees. New Phytologist, 207(3): 604–612. Kimball B A. 2005. Theory and performance of an infrared heater for ecosystem warming. Global Change Biology, 11(11): 2041–2056. Kokfelt U, Rosén P, Schoning K, et al. 2009. Ecosystem responses to increased precipitation and permafrost decay in subarctic Sweden inferred from peat and lake sediments. Global Change Biology, 15(7): 1652–1663. Li N, Wang G X, Yang Y, et al. 2011a. Plant production, and carbon and nitrogen source pools, are strongly intensified by experimental warming in alpine ecosystems in the Qinghai-Tibet Plateau. Soil Biology and Biochemistry, 43(5): 942–953. Li N, Wang G X, Yang Y, et al. 2011b. Short-term effects of temperature enhancement on community structure and biomass of alpine meadow in the Qinghai-Tibet Plateau. Acta Ecologica Sinica, 31(4): 895–905. (in Chinese)Litton C M, Raich J W, Ryan M G. 2007. Carbon allocation in forest ecosystems. Global Change Biology, 13(10): 2089–2109. Liu X D, Chen B D. 2000. Climatic warming in the Tibetan Plateau during recent decades. International Journal of Climatology, 20(14): 1729–1742. Modrzyński J, Chmura D J, Tjoelker M G. 2015. Seedling growth and biomass allocation in relation to leaf habit and shade tolerance among 10 temperate tree species. Tree Physiology, 35(8): 879–893. Mokany K, Raison R J, Prokushkin A S. 2006. Critical analysis of root: shoot ratios in terrestrial biomes. Global Change Biology, 12(1): 84–96. Ni J. 2004. Estimating net primary productivity of grasslands from field biomass measurements in temperate northern China. Plant Ecology, 174(2): 217–234. Pallas B, Christophe A. 2015. Relationships between biomass allocation, axis organogenesis and organ expansion under shading and water deficit conditions in grapevine. Functional Plant Biology, 42(12): 1116–1128. Pang Q Q, Cheng G D, Li S X, et al. 2009. Active layer thickness calculation over the Qinghai-Tibet Plateau. Cold Regions Science and Technology, 57(1): 23–28. Peng F, You Q G, Xu M H, et al. 2014. Effects of warming and clipping on ecosystem carbon fluxes across two hydrologically contrasting years in an alpine meadow of the Qinghai-Tibet Plateau. PLoS ONE, 9(10): e109319. Peng F, You Q G, Xu M H, et al. 2015. Effects of experimental warming on soil respiration and its components in an alpine meadow in the permafrost region of the Qinghai-Tibet Plateau. European Journal of Soil Science, 66(1): 145–154. Sellin A, Rosenvald K, Õunapuu-Pikas E, et al. 2015. Elevated air humidity affects hydraulic traits and tree size but not biomass allocation in young silver birches (Betula pendula). Frontiers in Plant Science, 6: 860. Shi F S, Wu N, Luo P. 2008. Effect of temperature enhancement on community structure and biomass of subalpine meadow in Northwestern Sichuan. Acta Ecologica Sinica, 28(11): 5286–5293. (in Chinese)Shi F S, Chen H, Chen H F, et al. 2012. The combined effects of warming and drying suppress CO2 and N2O emission rates in an alpine meadow of the eastern Tibetan Plateau. Ecological Research, 27(4): 725–733. Tanis S R, McCullough D G, Cregg B M. 2015. Effects of paclobutrazol and fertilizer on the physiology, growth and biomass allocation of three Fraxinus species. Urban Forestry & Urban Greening, 14(3): 590–598. Wan S, Luo Y, Wallace L L. 2002. Changes in microclimate induced by experimental warming and clipping in tallgrass prairie. Global Change Biology, 8(8): 754–768. Wang J F, Wu Q B. 2013. Impact of experimental warming on soil temperature and moisture of the shallow active layer of wet meadows on the Qinghai-Tibet Plateau. Cold Regions Science and Technology, 90–91: 1–8. Wang Y, Xi B Y, Bloomberg M, et al. 2015. Response of diameter growth, biomass allocation and N uptake to N fertigation in a triploid Populus tomentosa plantation in the North China Plain: ontogenetic shift does not exclude plasticity. European Journal of Forest Research, 134(5): 889–898. West G B, Brown J H, Enquist B J. 1997. A general model for the origin of allometric scaling laws in biology. Science, 276(5309): 122–126. West G B, Brown J H, Enquist B J. 1999a. The fourth dimension of life: Fractal geometry and allometric scaling of organisms. Science, 284(5420): 1677–1679. West G B, Brown J H, Enquist B J. 1999b. A general model for the structure and allometry of plant vascular systems. Nature, 400(6745): 664–667. Xia J Z, Liu S G, Liang S L, et al. 2014. Spatio-temporal patterns and climate variables controlling of biomass carbon stock of global grassland ecosystems from 1982 to 2006. Remote Sensing, 6(3): 1783–1802. Xu M H, Xue X. 2013. A research on summer vegetation characteristics & short-time responses to experimental warming of alpine meadow in the Qinghai-Tibetan Plateau. Acta Ecologica Sinica, 33(7): 2071–2083. (in Chinese) Xu M H, Peng F, You Q G, et al. 2014. Initial effects of experimental warming on temperature, moisture, and vegetation characteristics in an alpine meadow on the Qinghai-Tibetan Plateau. Polish Journal of Ecology, 62(3): 491–509. Xu M H, Peng F, You Q G, et al. 2015. Year-round warming and autumnal clipping lead to downward transport of root biomass, carbon and total nitrogen in soil of an alpine meadow. Environmental and Experimental Botany, 109: 54–62. Xu X, Luo Y Q, Shi Z, et al. 2014. Consistent proportional increments in responses of belowground net primary productivity to long-term warming and clipping at various soil depths in a tallgrass prairie. Oecologia, 174(3): 1045–1054. Xue X, Luo Y Q, Zhou X H, et al. 2011. Climate warming increases soil erosion, carbon and nitrogen loss with biofuel feedstock harvest in tallgrass prairie. GCB Bioenergy, 3(3): 198–207. Xue X, Xu M H, You Q G, et al. 2014. Influence of experimental warming on heat and water fluxes of alpine meadows in the Qinghai-Tibet Plateau. Arctic, Antarctic, and Alpine Research, 46(2): 441–458. Yang B, Wang J C, Zhang Y B. 2010. Effect of long-term warming on growth and biomass allocation of Abies faxoniana seedlings. Acta Ecologica Sinica, 30(21): 5994–6000. (in Chinese)Yang M X, Yao T D, Gou X H, et al. 2003. The soil moisture distribution, thawing-freezing processes and their effects on the seasonal transition on the Qinghai-Xizang (Tibetan) plateau. Journal of Asian Earth Sciences, 21(5): 457–465. Yang M X, Nelson F E, Shiklomanov N I, et al. 2010. Permafrost degradation and its environmental effects on the Tibetan Plateau: A review of recent research. Earth-Science Reviews, 103(1–2): 31–44. Yang Y H, Fang J Y, Ji C J, et al. 2009. Above- and belowground biomass allocation in Tibetan grasslands. Journal of Vegetation Science, 20(1): 177–184. Yang Y H, Fang J Y, Ma W H, et al. 2010. Large-scale pattern of biomass partitioning across China’s grasslands. Global Ecology and Biogeography, 19(2): 268–277. Yin H J, Liu Q, Lai T. 2008. Warming effects on growth and physiology in the seedlings of the two conifers Picea asperata and Abies faxoniana under two contrasting light conditions. Ecological Research, 23(2): 459–469. You Q G, Xue X, Peng F, et al. 2014. Comparison of ecosystem characteristics between degraded and intact alpine meadow in the Qinghai-Tibetan Plateau, China. Ecological Engineering, 71: 133–143. Yuan Z Y, Chen H Y H. 2010. Fine root biomass, production, turnover rates, and nutrient contents in boreal forest ecosystems in relation to species, climate, fertility, and stand age: literature review and meta-analyses. Critical Reviews in Plant Sciences, 29(4): 204–221. Zhang T J. 2007. Perspectives on environmental study of response to climatic and land cover/land use change over the Qinghai-Tibetan Plateau: an introduction. Arctic, Antarctic, and Alpine Research, 39(4): 631–634. |
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