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Spatial heterogeneity in stand characteristics alters water use patterns of mountain forests

Title data

Otieno, Dennis Ochuodho ; Li, Yuelin ; Liu, Xiaodong ; Zhou, Guoyi ; Cheng, JIng ; Ou, Yangxu ; Liu, Shizhong ; Chen, Xiuzhi ; Zhang, Qianmei ; Tang, Xuli ; Zhang, Deqiang ; Jung, Eun-Young ; Tenhunen, John:
Spatial heterogeneity in stand characteristics alters water use patterns of mountain forests.
In: Agricultural and Forest Meteorology. Vol. 236 (15 April 2017) . - pp. 78-86.
ISSN 0168-1923
DOI: https://doi.org/10.1016/j.agrformet.2017.01.007

Abstract in another language

Mountain landscapes have complex and rugged topographies, with abrupt spatial and temporal changes in microclimate and soil properties, factors that directly affect tree growth and canopy processes. These may alter functional relationships over short spatial scales, rendering the use of allometry in scaling tree water use (TWU) from single trees to stand level less accurate. On the other hand, canopy processes, especially stomatal conductance are sensitive to the environmental conditions prevailing above the canopy. Given that these also change rapidly in a mountain landscape, we speculate that patterns of water use in a complex landscape are determined by the interaction between stand structure and canopy conductance. We examined forest stand structure, microclimate and sap flux density (Js) in two forest stands distributed at 50 m and 330 m elevations of the Dinghushan Mountain in south China to determine how they influence tree functional allometry for scaling up stand water use. Tree sapwood area (SA) was correlated with the diameter at breast height (DBH) irrespective of species and location within the forest catchment. The maximum sap flux density (Js) on a clear sunny day ranged from 18 ± 9 to 48 ± 12 and 25 ± 8 to 64 ± 11 g m−2 s−1 in the 330 m and 50 m forest stands, respectively. Differences among trees and between forest stands were significant (p < 0.05). Daily maximum tree water use (TWU) ranged from 2 ± 4 to 36 ± 12 kg d−1 and 4 ± 3 to 42 ± 11 kg d−1 in the 330 and 50 m, respectively. Differences between the stands were significant. Within a stand, TWU was correlated with DBH irrespective of species. This functional relationship was, however, different between the forest stands, resulting in different E estimates for the respective stands. Cross-site variations were due to differences in vapor pressure deficit (VPD), photosynthetic photon flux density (PPFD) and leaf specific canopy conductance (gt). While trees responded in a similar manner to the microclimatic environment, between-site differences in stand characteristics shifted the functional relationships. Thus, in this complex mountain terrain, using a universal, site-specific allometric equation in scaling up sap flow from single trees to catchment-scale can lead up to 30% inaccuracy.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER132989
BAYCEER151526
Keywords: Functional allometry; Sap flux density; Microclimate; Mountain forests; Stand structure; Tree water use
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Former Professors
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Ecology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Former Professors > Chair Plant Ecology - Univ.-Prof. John D. Tenhunen, Ph.D.
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 570 Life sciences, biology
500 Science > 580 Plants (Botany)
Date Deposited: 11 Aug 2017 09:01
Last Modified: 30 Jan 2020 08:26
URI: https://eref.uni-bayreuth.de/id/eprint/33784