Effects of simulated changes in precipitation pattern on sap flux in two tree species in subtropical region

Prerequisite for selection of appropriate tree species in afforestation programs is to understand their water use strategy. Acacia mangium Willd., Schima wallichii Choisy, and Cunninghamia lanceolata (Lamb.) Hook are the three main vegetation restoration pioneer species in southern China, but no comparative research on the water use strategy of these three tree species have been reported. Our objective was to gain a detailed understanding of how photosynthetically active radiation (PAR), vapor pressure deficit (VPD), and soil water content (SWC) at different soil depths control the sap flux density (Js) in the dry and wet seasons. We measured the Js of these three tree species by using the thermal dissipation method in low subtropical China. We found that both S. wallichii and C. lanceolata differed clearly in their stomatal behavior from one season to another, while A. mangium did not. The canopy conductance per sapwood area of S. wallichii and C. lanceolata was very sensitive to VPD in the dry season, but not in the wet season. The Js of A. mangium was negatively correlated to SWC in all soil layers and during both seasons, while the other two species were not sensitive to SWC in the deeper layers and only positively correlated to SWC in dry season. Our results demonstrate that the three species have distinct water use strategies and may therefore respond differently to changing climate.

Download Full-text

Interspecific variations in tree allometry and functional traits in subtropical plantations in southern China

Functional Plant Biology ◽

10.1071/fp19325 ◽

2020 ◽

Vol 47 (6) ◽

pp. 558

Author(s):

Liwei Zhu ◽

Yanting Hu ◽

Ping Zhao

Keyword(s):

Leaf Area ◽

Water Transport ◽

Functional Traits ◽

Tree Species ◽

Mechanical Stability ◽

Tree Height ◽

Total Carbon ◽

Acacia Auriculiformis ◽

Subtropical Region ◽

Tree Allometry

Mechanical stability against buckling and water transport resistance through xylem vary with increasing tree height. To explore interspecific allometry based on morphological and physiological traits can play a crucial role in revealing their ecological adaptation. Four architectural traits (tree height, diameter at the breast height (DBH), crown width and crown depth) and seven functional traits (specific leaf area (SLA), leaf total carbon concentration (TC), midday leaf water potential, leaf δ13C and δ18O, wood density and xylem water transport efficiency) were measured in Schima superba, Acacia auriculiformis and Eucalyptus citriodora plantations in the subtropical region of China. The mechanical stability declined in the order of S. superba > A. auriculiformis > E. citriodora. Taller species at a given DBH had slender stems and narrower crowns. Smaller leaf δ18O and more efficient xylem water transport were observed in two taller tree species, A. auriculiformis and E. citriodora. Smaller SLA, higher leaf TC and larger leaf area indicated more carbon allocation to leaves of S. superba. The variations in architectural and functional traits with tree allometry among tree species may provide a more complete understanding of species-specific growth strategies in this subtropical region.

Download Full-text

Variability in radial sap flux density patterns and sapwood area among seven co-occurring temperate broad-leaved tree species

Tree Physiology ◽

10.1093/treephys/28.12.1821 ◽

2008 ◽

Vol 28 (12) ◽

pp. 1821-1830 ◽

Cited By ~ 115

Author(s):

T. Gebauer ◽

V. Horna ◽

C. Leuschner

Keyword(s):

Flux Density ◽

Tree Species ◽

Sap Flux ◽

Sap Flux Density ◽

Sapwood Area

Download Full-text

Plus Tree Selection of Quercus salicina Blume and Q. glauca Thunb. and Its Implications in Evergreen Oaks Breeding in Korea

Forests ◽

10.3390/f11070735 ◽

2020 ◽

Vol 11 (7) ◽

pp. 735

Author(s):

In Sik Kim ◽

Kyung Mi Lee ◽

Donghwan Shim ◽

Jin Jung Kim ◽

Hye-In Kang

Keyword(s):

Climate Change ◽

Tree Species ◽

Tree Breeding ◽

Grading System ◽

Subtropical Region ◽

Tree Breeding Program ◽

Plus Tree ◽

Evergreen Oak ◽

Selection Of ◽

Evergreen Oaks

This study was conducted to select plus trees of two evergreen oaks, Quercus salicina and Q. glauca, in Korea. Evergreen oaks are distributed in subtropical region in Korea and have recently emerged as one of the alternative tree species against climate change. Accordingly, a tree breeding program is underway to foster evergreen oaks as a reforestation species for the future. Through intensive survey on the distribution range, 15 stands (8 for Q. salicina, 3 for Q. glauca, and 4 for both species) were selected as base populations. To select candidate trees, we developed a subjective grading system with six characteristics in three categories and introduced a weighted generalized value (GVIw) to compare superiority of candidate trees. The candidate trees were screened using baseline value ‘0’, i.e., if GVIw > 0, then accepted and if GVIw < 0, then rejected. After then, adjustment was conducted to avoid biasing the selection of plus trees for a particular location. Through this process, 44 candidate trees in Q. salicina and 41 candidate trees in Q. glauca were selected as plus trees. Finally, the results and implications were discussed in relation to evergreen oak breeding in Korea.

Download Full-text

Leaf Anatomy and Micromorphology Characteristics of Ketum [Mitragyna speciosa (Korth.) Havil.] (Rubiaceae)

Tropical Life Sciences Research ◽

10.21315/tlsr2021.32.1.7 ◽

2021 ◽

Vol 32 (1) ◽

pp. 105-115

Author(s):

Mohd Norfaizal Ghazalli ◽

◽

Muhammad Shafie Md Sah ◽

Mazidah Mat ◽

Khadijah Awang ◽

...

Keyword(s):

Leaf Anatomy ◽

Tree Species ◽

Secondary Forest ◽

Glandular Trichomes ◽

Secretory Cells ◽

Subtropical Region ◽

Abaxial Side ◽

Mitragyna Speciosa ◽

Disturbed Areas ◽

Parenchyma Cells

Mitragyna speciosa (Korth.) Havil. or locally known as ketum/daun sebiak/biakbiak belongs to Rubiaceae family and generally occurs in secondary forest or disturbed areas in tropical and subtropical region. This research enumerated the characterisation of Mitragyna speciosa leaf anatomy and micromorphology features which is still not well documented. This medium to large sized tree species characterised with opposite arrangement, ovate-acuminate leaf and with 12–17 pairs of veins. Transverse sections of petioles showed that this species has petiole outlines with slightly convex at the middle of the adaxial part and ‘U’-shaped on abaxial side. Results also showed that this species has paracytic and hypostomatic stomata, combination of non-glandular (majority) and glandular trichomes (minority), with observation on the secretory cells present in petiole and midrib parenchyma cells. Cuticle on the abaxial and adaxial epidermal surfaces showed the presence granule and wax films with periclinal and anticlinal walls can be differentiated clearly. The results obtained in this study can be used to providing additional systematics information of Mitragyna speciosa with the documentation of the leaf anatomy and micromorphology characters.

Download Full-text

Tree Species with Photosynthetic Stems Have Greater Nighttime Sap Flux

Frontiers in Plant Science ◽

10.3389/fpls.2018.00030 ◽

2018 ◽

Vol 9 ◽

Cited By ~ 7

Author(s):

Xia Chen ◽

Jianguo Gao ◽

Ping Zhao ◽

Heather R. McCarthy ◽

Liwei Zhu ◽

...

Keyword(s):

Tree Species ◽

Sap Flux

Download Full-text