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Allometric relationships between primary size measures and sapwood area for six common tree species in snow-dependent ecosystems in the Southwest United States

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Journal of Forestry Research 2020年第6期31卷 2171-2180页

作者： Bhaskar Mitra Shirley A.Papuga MRoss Alexander Tyson Lee Swetnam Nate Abramson School of Natural Resources and Environment University of ArizonaTucsonAZ 85721USA Department of Geology Wayne State UniversityDetroitMI 48202USA Laboratory of Tree-Ring Research University of ArizonaTucsonAZ 85721USA BIO5 Institute University of ArizonaTucsonAZ 85721USA Department of Hydrology and Water Resources University of ArizonaTucsonAZ 85721USA

High-elevation,snow-dependent,semiarid ecosystems across southwestern United States are expected to be vulnerable to climate change,including drought and fi re,with implications for various aspects of the water *** that end,much less is known about the dynamics of transpiration,an important component of the water cycle across this *** the individual-tree scale,transpiration is estimated by scaling mean sap fl ux density by the hydroactive sapwood area(SA).SA also remains a key factor in eff ectively scaling individual tree water-use to stand *** across large spatial scales is normally established by relating SA of a few trees to primary size measures,e.g.,diameter at breast height(DBH),tree height(H),or canopy diameter(CD).Considering the importance of SA in scaling transpiration,the primary objective of this study was therefore to establish six species-specifi c(aspen,maple,white fi r,ponderosa pine,Douglas fi r,Englemann spruce)allometric relationships between SA and three primary size measures(DBH,CD,or H)across two high-elevation,snow-dependent,semiarid ecosystems in New Mexico and *** on multiple statistical criteria(coeffi cient of determination,index of agreement,Nash–Sutcliff e effi-ciency)and ease of measurement in the forest,we identifi ed DBH as the primary independent variable for estimating SA across all *** on group regression analysis,we found allometric relationships to be signifi cantly(p<0.05)diff erent for the same species(ponderosa pine,Douglas-fi r)across diff erent ***,our allometric relationships provide a valuable database for estimating transpiration at diff erent spatial scales from sap fl ow data in some of our most vulnerable ecosystems.

关键词： Allometry Diameter at breast height Mountain ecosystem sapwood area Southwestern USA

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Water transport of native and exotic tree species in relation to xylem anatomical characteristics in low subtropical China

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Journal of Plant Ecology 2018年第3期11卷 423-433页

作者： Yanting Hu Jianguo Gao Ping Zhao Weijun Shen Peiqiang Zhao Liwei Zhu Guangyan Ni Junfeng Niu Lei Ouyang Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems South China Botanical GardenChinese Academy of SciencesXingke Road 723Tianhe DistrictGuangzhou 510650China University of Chinese Academy of Sciences Beijing 100049China Guangdong Provincial Key Laboratory of Applied Botany South China Botanical GardenChinese Academy of SciencesGuangzhou 510650China

Aims Exotic fast-growing tree species have been commonly planted as pioneer species to facilitate ecological restoration in South *** growth and resource utilization behavior related to intrinsic physiology and structural properties have profound influences on forest ***,the contrastive research focusing on water utilization features along with xylem anatomical properties between native and exotic species is scarce in South *** objective of this study is to investigate the sapwood anatomical characteristics and water utilization conditions of native and exotic fast-growing species,and to elucidate the relationship between sap-flux density and conduit *** We measured sap-flux density,conduit length,diameter and density of four native species(Schima superba,Michelia mac-clurei,Castanopsis hystrix and Castanopsis fissa)and four exotic species(Eucalyptus citriodora,Eucalyptus urophylla×grandis,Acacia auriculaeformis and Acacia mangium).Sap flux density was measured based on the Granier’s thermal dissipation probe *** whole-tree water transport was quantified by mul-tiplying sap-flux density by sapwood *** measurements of conduit characteristics were conducted by using segregation and slice *** Findings sapwood area increased with the growing diameter at breast height(DBH)as a power *** species had a larger water-conducting tissue area than exotic species at the same DBH value when trees grew to a size with a certain value of *** con-duit diameter of exotic species was significantly larger than that of native ***,native species,such as *** and ***,had longer conduit length and higher conduit den-sity than other tree *** on a physiological interpretation of the measured conduit characteristics,native tree species devel-oped a safe water transport system while exotic fast-growing tree species come into being an efficient system *** trans-port i

关键词： sap-flux density conduit characteristics sapwood area water transport

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Sap-flow measurement and scale transferring from sample trees to entire forest stand of Populus euphratica in desert riparian forest in extreme arid region

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Research in Cold and Arid Regions 2009年第3期1卷 258-266页

作者： JianHua Si 1, Qi Feng 1, HaiYang Xi 1, ZongQiang Chang 1, YongHong Su 1, Kai Zhang 1,2 1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China. 2. Institute of Arid Meteorology, China Meteorological Administration, Lanzhou, Gansu 730020, China. Chinese Acad Sci Cold & Arid Reg Environm & Engn Res Inst 320 Donggang West Rd Lanzhou 730000 Gansu Peoples R China China Meteorol Adm Inst Arid Meteorol Lanzhou 730020 Gansu Peoples R China

Understanding how the transpiration of this vegetation type responds to environmental stress is important for determining the wa-ter-balance dynamics of the riparian ecosystem threatened by groundwater depletion. Transpiration and sap flow were measured using the heat-pulse technique. The results were then projected up to the stand level to investigate the stand’s water-use in relation to climate forcing in the desert riparian forest in an extreme arid region. This study took place from April through October 2003 and from May through October 2004. The experimental site was selected in the Populus euphratica Forest Reserve (101o10' E, 41o59' N) in Ejina county, in the lower Heihe River basin, China. The sapwood area was used as a scalar to extrapolate the stand-water consumption from the whole trees’ water consumption measured by the heat-pulse velocity recorder (HPVR). Scale transferring from a series of individual trees to a stand was done according to the existing natural variations between trees under given environmental conditions. The application of the biometric parameters available from individual tree and stand levels was proved suitable for this purpose. A significant correlation between the sapwood area and tree diameter at breast height (DBH) was found. The prediction model is well fitted by the power model. On the basis of the prediction model, the sapwood area can be cal-culated by DBH. The sap-flow density can then be used to extrapolate the stand-water use by means of a series of mathematical models.

关键词： sap flow heat-pulse technique sapwood area scale transferring extreme arid region Populus euphratica

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