Effects of pruning intensity on nonstructural carbohydrates of Populus alba ×  P. talassica in the arid desert region of Northwest China

Abstract

Although pruning is important to obtain high-quality, large-diameter timber, the effects of pruning on nonstructural carbohydrates (NSC) in aboveground organs of many timber species are not well understood. Three intensities of pruning (none, moderate and severe) were tested on poplars (Populus alba ×  P. talassica) in the arid desert region of northwest China to compare the concentrations of soluble sugar (SS), starch (ST) and total nonstructural carbohydrate (TNC) in leaves, branches and trunks during the growing season. The concentration of NSC components after different pruning intensities varied similarly in seasonal patterns, increasing slowly at the beginning of the growing season, continuously declining in the middle, then gradually recovering by the end of the growing season. The monthly mean NSC concentration in poplar differed significantly among the three pruning intensities (p < 0.05). The SS concentration in pruned trees was higher than in unpruned trees (p < 0.05). For moderately pruned trees, the concentrations of ST and TNC in trunks and branches were higher than in unpruned and in severely pruned trees (p < 0.05). Compared with no pruning, pruning changed the seasonal variation in NSC concentration. The orders of SS and TNC concentrations in aboveground organs were leaf > branch > trunk, while the order of ST concentration was trunk > leaf > branch, which was related to functional differences of plant organs. The annual average growth in height of unpruned, moderately pruned, and severely pruned poplars was 0.21 ± 0.06, 0.45 ± 0.09 and 0.24 ± 0.05 m, respectively, and the annual average growth in DBH were 0.92 ± 0.04, 1.27 ± 0.06 and 1.02 ± 0.05 cm, respectively. Our results demonstrate that moderate pruning may effectively increase the annual growth in tree height and DBH while avoiding damage caused by excessive pruning to the tree body. Therefore, moderate pruning may increase the NSC storage and improve the growth of timber species.

Keywords

Pruning intensity / Nonstructural carbohydrate / Populus alba ×  P. talassica / Seasonal pattern

References

[1] Anderegg WR, Callaway ES. Infestation and hydraulic consequences of induced carbon starvation. Plant Physiol, 2012, 159: 1866-1874.

[2] ANSI. American National Standard for Tree Care Operations—tree, shrub, and other woody plant maintenance: standards practices (pruning) (part 1), 2001, New York: American National Standards Institute.

[3] Atkinson RRL, Burrell MM, Rose KE, Osborne CP, Rees M. The dynamics of recovery and growth: how defoliation affects stored resources?. Proc R Soc B Biol Sci, 2014, 281(1783): 140-147.

[4] Bore JK, Isutsa DK, Itulya FM, Ngetich WK. Effects of pruning time and resting period on total non-structural carbohydrates, regrowth and yield of tea (Camellia sinensis L.). J Hortic Sci Biotechnol, 2003, 78(2): 272-277.

[5] Buysse J, Merckx R. An improved colorimetric method to quantify sugar content of plant tissue. J Exp Bot, 1993, 44(10): 1627-1629.

[6] Carbone MS, Czimczik CL, Keenan TF, Murakami PF, Pederson N, Schaberg PG, Xu X, Richardson AD. Age, allocation and availability of nonstructural carbon in mature red maple trees. New Phytol, 2013, 200: 1145-1155.

[7] Chesney P, Vasquez N. Dynamics of non-structural carbohydrate reserves in pruned Erythrina poeppigiana and Gliricidia sepium trees. Agrofor Syst, 2007, 69(2): 89-105.

[8] Eyles A, Pinkard EA, Mohammed C. Shifts in biomass and resource allocation patterns following defoliation in Eucalyptus globulus growing with varying water and nutrient supplies. Tree Physiol, 2009, 29(6): 753-764.

[9] Gaucher C, Gougeon S, Mauffette Y, Messier C. Seasonal variation in biomass and carbohydrates partitioning of understory sugar maple (Acer saccharum) and yellow birch (Betula alleghaniensis) seedlings. Tree Physiol, 2005, 25: 93-100.

[10] Gillner S, Braüning A, Roloff A. Dendrochronological analysis of urban trees: climatic response and impact of drought on frequently used tree species. Trees, 2014, 28: 1079-1093.

[11] Hoch G, Richter A, Körner C. Non-structural carbon compounds in temperate forest trees. Plant, Cell Environ, 2003, 26(7): 1067-1081.

[12] Honkanen T, Haukioja E, Suomela J. Effects of simulated defoliation and debudding on needle and shoot growth in Scots pine (Pinus sylvestris): implications of plant source/sink relationships for plant-herbivore studies. Funct Ecol, 1994, 8: 631-639.

[13] Ishii H, Clement JP, Shaw DC. Branch growth and crown form in old coastal Douglas-fir. For Ecol Manag, 2000, 131(1): 81-91.

[14] Johnson DL. Kuser JE. Pruning. Urban and community forestry in the Northeast, 2007, Dordrecht: Springer Netherlands 46 57

[15] Landhäusser SM, Lieffers VJ. Seasonal changes in carbohydrate reserves in mature northern Populus tremuloides clones. Trees, 2003, 17(6): 471-476.

[16] Landhäusser SM, Lieffers VJ. Defoliation increases risk of carbon starvation in root systems of mature aspen. Trees, 2012, 26(2): 653-661.

[17] Lecigne B (2013) Effets des tailles de dégagement des reseaux électriques sur la colonization de l’espace par les arbres, développement et mise en application d’analysis de données T-LidAR. Master thesis, Université du Québec â Montréal (UQAM), Montreal, pp 24–32

[18] León J, Rojo E, Sánchez-Serrano JJ. Wound signalling in plants. J Exp Bot, 2001, 52(354): 1-9.

[19] Li H, Hoch G, Körner C. Source/sink removal affects mobile carbohydrates in Pinus cembra at the Swiss treeline. Trees, 2002, 16: 331-337.

[20] Martinez-Vilalta J, Sala A, Asensio D, Galiano L, Hoch G, Palacio S, Piper FL, Lloret F. Dynamics of non-structural carbohydrates in terrestrial plant: a global synthesis. Ecol Monogr, 2016, 86(4): 495-516.

[21] Maurin V, Desrochers A. Physiological and growth responses to pruning season and intensity of hybrid poplar. For Ecol Manag, 2013, 304: 399-406.

[22] Mei L, Xiong YM, Gu JC, Wang ZQ. Whole-tree dynamics of non-structural carbohydrate and nitrogen pools across different seasons and in response to girdling in two temperate trees. Oecologia, 2015, 177(2): 333-344.

[23] Quentin AG, Pinkard EA, Ryan MG, Tissue DT, Baggett S. Non-structural carbohydrates in woody plants compared among laboratories. Tree Physiol, 2015, 35(11): 1-20.

[24] Ramirez JA, Handa IT, Posada JM, Delagrange S, Messier C. Carbohydrate dynamics in roots, stems, and branchs after maintenance pruning in two common urban tree species of North America. Urban For Urban Green, 2018, 30: 24-31.

[25] Reichenbacker RR, Schultz RC, Hart ER. Artificial defoliation effect on populus growth, biomass production, and total nonstructural carbohydrate concentration. Environ Entomol, 1996, 25(3): 632-642.

[26] Schaberg PG, Snyder MC, Shane JB, Donnelly JR. Seasonal patterns of carbohydrate reserves in red spruce seedlings. Tree Physiol, 2000, 20(8): 549-555.

[27] Schädel C, Blöchl A, Richter A, Hoch G. Short-term dynamics of nonstructural carbohydrates and hemicelluloses in young branches of temperate forest trees during bud break. Tree Physiol, 2009, 29(7): 901-911.

[28] Song H, Wang CQ. Mechanism of wound-induced defense response and signal transduction in plants. Chin Bull Bot, 2013, 48(4): 461-469. (with abstract in English)

[29] Song XZ, Peng CH, Zhou GM, Gu HH, Zhang C. Dynamic allocation and transfer of non-structural carbohydrates, a possible mechanism for the explosive growth of Moso bamboo (Phyllostachys heterocycla). Sci Rep, 2016, 6: 25908-25915.

[30] Spann TM, Beede RH, Dejong TM. Seasonal carbohydrate storage and mobilization in bearing and non-bearing pistachio (Pistacia vera) trees. Tree Physiol, 2008, 28(2): 207-213.

[31] Vanderklein DW, Reich PB. The effect of defoliation intensity and history on photosynthesis, growth and carbon reserves of two conifers with contrasting leaf lifespans and growth habits. New Phytol, 1999, 144: 121-122.

[32] Wang CS, Zeng J. Research advances in forest tree pruning. World For Res, 2016, 29(3): 65-70. (with abstract in English)

[33] Wiley E, Huepenbecker S, Casper BB, Helliker BR. The effects of defoliation on carbon allocation: can carbon limitation reduce growth in favour of storage?. Tree Physiol, 2013, 33(11): 1216-1228.

[34] Zhang J, Li XF, Li JG, Wang H, Huang CT, Min SJ, Li G, Zhang FH, Tian X, Kong J. Sap flow dynamics of Populus alba L. ×  P. talassica plantation in arid desert area. Acta Ecol Sin, 2013, 33(18): 5655-5660. with abstract in English)

[35] Zhang HY, Wang CK, Wang XC. Spatial variations in non-structural carbohydrates in stems of twelves temperate tree species. Trees, 2014, 28(1): 77-89.