Spatiotemporal variations in sap flow in a larch plantation: sampling size for stand scale estimates

Abstract

The sap flow method is widely used to estimate forest transpiration. However, at the individual tree level it has spatiotemporal variations due to the impacts of environmental conditions and spatial relationships among trees. Therefore, an in-depth understanding of the coupling effects of these factors is important for designing sap flow measurement methods and performing accurate assessments of stand scale transpiration. This study is based on observations of sap flux density (SF_d) of nine sample trees with different Hegyi’s competition indices (HCIs), soil moisture, and meteorological conditions in a pure plantation of Larix gmelinii var. principis-rupprechtii during the 2021 growing season (May to September). A multifactorial model of sap flow was developed and possible errors in the stand scale sap flow estimates associated with sample sizes were determined using model-based predictions of sap flow. Temporal variations are controlled by vapour pressure deficit (VPD), solar radiation (R), and soil moisture, and these relationships can be described by polynomial or saturated exponential functions. Spatial (individual) differences were influenced by the HCI, as shown by the decaying power function. A simple SF_d model at the individual tree level was developed to describe the synergistic influences of VPD, R, soil moisture, and HCI. The coefficient of variations (CV) of the sap flow estimates gradually stabilized when the sample size was > 10; at least six sample trees were needed if the CV was within 10%. This study improves understanding of the mechanisms of spatiotemporal variations in sap flow at the individual tree level and provides a new methodology for determining the optimal sample size for sap flow measurements.

References

Arieska PK, Herdiani N (2018) Margin of Error between Simple Random Sampling and Stratified Sampling. In: Proceeding of the 1st International Conference Technopreneur and Education 2018, Nov 14, 2018, Surabaya, Indonesia. 1(1), pp. 408–412.

BallesterC, BadalE, BonetL, TestiL, IntriglioloDS. Determining transpiration coefficients of ‘Rojo Brillante’ persimmon trees under Mediterranean climatic conditions. Agr Water Manage, 2022, 271: 107804

BovardBD, CurtisPS, VogelCS, SuHB, SchmidHP. Environmental controls on sap flow in a northern hardwood forest. Tree Physiol, 2005, 25(1): 31-38

ČermákJ, KučeraJ, NadezhdinaN. Sap flow measurements with some thermodynamic methods, flow integration within trees and scaling up from sample trees to entire forest stands. Trees-Struct Funct, 2004, 18: 529-546

ChenDY, WangYK, LiuSY, WeiXG, WangX. Response of relative sap flow to meteorological factors under different soil moisture conditions in rainfed jujube (Ziziphus jujuba Mill.) plantations in semiarid Northwest China. Agr Water Manage, 2014, 136: 23-33

ChenSN, ChenZSN, XuH, KongZ, XuZB, LiuQQ, LiuPS, ZhangZQ. Biophysical regulations of transpiration and water use strategy in a mature Chinese pine (Pinus tabulaeformis) forest in a semiarid urban environment. Hydrol Process, 2022, 36(2): e14485

ChenSN, WeiW, TongB, ChenLD. Effects of soil moisture and vapor pressure deficit on canopy transpiration for two coniferous forests in the Loess Plateau of China. Agr For Meteorol, 2023, 339: 109581

ChiuCW, KumeT, KomatsuH, TsengH, WeyTH, OtsukiK. Seasonal changes of azimuthal, radial, and tree-to-tree variations in sap flux affect stand transpiration estimates in a Cryptomeria japonica forest, central Taiwan. J For Res, 2016, 21(4): 151-160

ClausnitzerF, KöstnerB, SchwärzelK, BernhoferC. Relationships between canopy transpiration, atmospheric conditions and soil water availability—analyses of long-term sap-flow measurements in an old Norway spruce forest at the Ore Mountains/Germany. Agr for Meteorol, 2011, 151(8): 1023-1034

EllisonD, ClaassenM, Van NoordwijkM, SullivanCA, ViraB, XuJ, ArcherE, BishopK, GebrehiwotSG, HaywoodLK. Governance options for addressing changing forest-water relations, 2018 IUFRO

FangJ, TianQY, HeZB, DuJ, ChenLF, LinPF, ZhuX. Response of sap flow in Qinghai spruce (Picea crassifolia) to environmental variables in the Qilian Mountains of China. Trees-Struct Funct, 2022, 36: 1261-1272

GebauerT, HornaV, LeuschnerC. Variability in radial sap flux density patterns and sapwood area among seven co-occurring temperate broad-leaved tree species. Tree Physiol, 2008, 28(12): 1821-1830

GhimireCP, van MeerveldHJI, ZwartendijkBW, BruijnzeelLA, RavelonaM, LahitianaJ, LubczynskiMW. Vapour pressure deficit and solar radiation are the major drivers of transpiration in montane tropical secondary forests in eastern Madagascar. Agric For Meteorol, 2022, 326: 109159

GranierA. Evaluation of transpiration in a Douglas-Fir stand by means of sap flow measurements. Tree Physiol, 1987, 3(4): 309-320

GranierA, BironP, BrédaN, PontaillerJY, SaugierB. Transpiration of trees and forest stands: short and long-term monitoring using sap flow methods. Glob Change Biol, 1996, 2(3): 265-274

GranierA, LoustauD, BrédaN. A generic model of forest canopy conductance dependent on climate, soil water availability and leaf area index. Ann For Sci, 2000, 57(8): 755-765

HegyiF. A simulation model for managing jack-pine stands simulation. RoyalColl Res Notes, 1974, 30: 74-90

HentschelR, BittnerS, JanottM, BiernathC, HolstJ, FerrioJP, GesslerA, PriesackE. Simulation of stand transpiration based on a xylem water flow model for individual trees. Agric For Meteorol, 2013, 182–183: 31-42

HornaV, SchuldtB, BrixS, LeuschnerC. Environment and tree size controlling stem sap flux in a perhumid tropical forest of Central Sulawesi, Indonesia. Ann for Sci, 2011, 68(5): 1027-1038

JiaoL, LuN, FangWW, LiZS, WangJ, JinZ. Determining the independent impact of soil water on forest transpiration: a case study of a black locust plantation in the Loess Plateau, China. J Hydrol, 2019, 572: 671-681

JiménezMS, NadezhdinaN, ČermákJ, MoralesD. Radial variation in sap flow in five laurel forest tree species in Tenerife. Canary Islands Tree Physiol, 2000, 20(17): 1149-1156

JiménezE, VegaJA, Pérez-GorostiagaP, FonturbelT, FernándezC. Evaluation of sap flow density of Acacia melanoxylon R. Br. (blackwood) trees in overstocked stands in north-western Iberian Peninsula. Eur J For Res, 2010, 129: 61-72

KobayashiN, KumagaiTO, MiyazawaY, MatsumotoK, TateishiM, LimTK, MuddRG, ZieglerAD, GiambellucaTW, YinS. Transpiration characteristics of a rubber plantation in central Cambodia. Tree Physiol, 2014, 34(3): 285-301

KochetovaGV, AverchevaOV, BassarskayaEM, ZhigalovaTV. Light quality as a driver of photosynthetic apparatus development. Biophys Rev, 2022, 14: 779-803

KumagaiTO, AokiS, NagasawaH, MabuchiT, KubotaK, InoueS, UtsumiY, OtsukiK. Effects of tree-to-tree and radial variations on sap flow estimates of transpiration in Japanese cedar. Agric For Meteorol, 2005, 135(1–4): 110-116

KumagaiTO, AokiS, ShimizuT, OtsukiK. Sap flow estimates of stand transpiration at two slope positions in a Japanese cedar forest watershed. Tree Physiol, 2007, 27(2): 161-168

KumeT, TsurutaK, KomatsuH, KumagaiTO, HigashiN, ShinoharaY, OtsukiK. Effects of sample size on sap flux-based stand-scale transpiration estimates. Tree Physiol, 2010, 30(1): 129-138

LagergrenF, LindrothA. Variation in sapflow and stem growth in relation to tree size, competition and thinning in a mixed forest of pine and spruce in Sweden. Forest Ecol Manag, 2004, 188(1–3): 51-63

LiZH, YuPT, WangYH, WebbAA, HeC, WangYB, YangLL. A model coupling the effects of soil moisture and potential evaporation on the tree transpiration of a semi-arid larch plantation. Ecohydrology, 2017, 10(1): e1764

LiYF, LiMX, LiX, LiuZL, MingAG, LanHX, YeSM. The abundance and structure of deadwood: a comparison of mixed and thinned Chinese fir plantations. Front Plant Sci, 2021, 12: 614695

LiJM, YuPT, WanYF, WangYH, YuYP, LiuBB, PanL, XuLH, LiuZB, WangX. The differential responses of tree transpiration to seasonal drought among competitive pressures in a larch plantation of northwest China. Agr for Meteorol, 2023, 336: 109468

LiuZB, WangYH, TianA, WebbAA, YuPT, XiongW, XuLH, WangYR. Modeling the response of daily evapotranspiration and its components of a larch plantation to the variation of weather, soil moisture, and canopy leaf area index. J Geophys Res-Atmos, 2018, 123(14): 7354-7374

LiuYH, DingFJ, ShuDY, ZhaoWJ, ChuiYC, HouYJ, WuP. Dominance-caused differences in transpiration of trees in a Karst broadleaved mixed forest. J For Res, 2020, 31(6): 2083-2095

LiuZB, YuSP, XuLH, WangYH, YuPT, ChaoY. Differentiated responses of daytime and nighttime sap flow to soil water deficit in a larch plantation in Northwest China. Agric Water Manage, 2023, 289: 108540

MoonM, KimT, ParkJ, ChoS, RyuD, SuhS, KimHS. Changes in spatial variations of sap flow in Korean pine trees due to environmental factors and their effects on estimates of stand transpiration. J Mount Sci, 2016, 13: 1024-1034

OogathooS, HouleD, DuchesneL, KneeshawD. Vapour pressure deficit and solar radiation are the major drivers of transpiration of balsam fir and black spruce tree species in humid boreal regions, even during a short-term drought. Agric For Meteorol, 2020, 291: 108063

PatankarR, QuintonWL, HayashiM, BaltzerJL. Sap flow responses to seasonal thaw and permafrost degradation in a subarctic boreal peatland. Trees-Struct Funct, 2015, 29: 129-142

SchmidtU, ThöniH, KaupenjohannM. Using a boundary line approach to analyze N₂O flux data from agricultural soils. Nutr Cycl Agric Ecosyst, 2000, 57: 119-129

ShinoharaY, OnozawaY, ChiwaM, KumeT, KomatsuH, OtsukiK. Spatial variations in throughfall in a Moso bamboo forest: sampling design for the estimates of stand-scale throughfall. Hydrol Process, 2010, 24(3): 253-259

SongLN, ZhuJJ, LiMC, ZhangJX, ZhengX, WangK. Canopy transpiration of Pinus sylvestris var. mongolica in a sparse wood grassland in the semiarid sandy region of Northeast China. Agric For Meteorol, 2018, 250–251: 192-201

SongXW, LyuSD, WenXF. Limitation of soil moisture on the response of transpiration to vapor pressure deficit in a subtropical coniferous plantation subjected to seasonal drought. J Hydrol, 2020, 591: 125301

SongLN, ZhuJJ, ZhengX, LiXJY, WangK, ZhangJX, WangGC, SunHH. Water use dynamics of trees in a Pinus tabuliformis plantation in semiarid sandy regions Northeast China. Agric Water Manage, 2023, 275: 107995

SunG, VoseJM. Forest management challenges for sustaining water resources in the Anthropocene. Forests, 2016, 7(3): 68

TangMP, ChenYG, ShiYJ, ZhouGM, ZhaoMS. Intraspecific and Interspecific competition analysis of community dominant plant populations based on Voronoi diagram. Acta Ecol Sin, 2007, 27(11): 4707-4716

TateishiM, XiangY, SaitoT, OtsukiK, KasaharaT. Changes in canopy transpiration of Japanese cypress and Japanese cedar plantations because of selective thinning. Hydrol Process, 2015, 29: 5088-5097

TfwalaCM, van RensburgLD, BelloZA, ZietsmanPC. Transpiration dynamics and water sources for selected indigenous trees under varying soil water content. Agric For Meteorol, 2019, 275: 296-304

TianA, WangYH, WebbAA, LiuZB, YuPT, XiongW, WangX. Partitioning the causes of spatiotemporal variation in the sunny day sap flux density of a larch plantation on a hillslope in northwest China. J Hydrol, 2019, 571: 503-515

Turner R (2019) Deldir: Delaunay Triangulation and Dirichlet (Voronoi) Tessellation. R package version 0.2–9. Available online at: https://CRAN.R-project.org/package=deldir

WangL, LiuZB, GuoJB, WangYH, MaJ, YuSP, YuPT, XuLH. Estimate canopy transpiration in larch plantations via the interactions among reference evapotranspiration, leaf area index, and soil moisture. For Ecol Manage, 2021, 481: 118749

WaseemM, ManiN, AndiegoG, UsmanM. A review of criteria of fit for hydrological models. Int Res J Eng Technol, 2017, 4(11): 1765-1772

WhitleyR, ZeppelM, ArmstrongN, Macinnis-NgC, YunusaI, EamusD. A modified Jarvis-Stewart model for predicting stand-scale transpiration of an Australian native forest. Plant Soil, 2008, 305: 35-47

XieCP, LiuDW, HuangCY, HeJ. Study on the intraspecific and interspecific competition of Pseudolarix amabilis in Changxing County Zhejiang Province. Pol J Environ Stud, 2021, 30(4): 3317-3325

ZhangJG, GuanJH, ShiWY, YamanakaN, DuS. Interannual variation in stand transpiration estimated by sap flow measurement in a semi-arid black locust plantation, Loess Plateau China. Ecohydrology, 2015, 8(1): 137-147

ZhangX, WangYJ, WangYQ, ZhangSH, ZhaoXL. Effects of social position and competition on tree transpiration of a natural mixed forest in Chongqing, China. Trees-Struct Funct, 2019, 33: 719-732

ZhaoXN, LiXM, HuW, LiuJQ, DiN, DuanJ, LiDD, LiuY, GuoYZ, WangAY, DengT, XiBY. Long-term variation of the sap flow to tree diameter relation in a temperate poplar forest. J Hydrol, 2023, 618: 129189