期刊
FORESTS
卷 11, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/f11020206
关键词
sap flux density; canopy conductance per sapwood area; dry and wet season; soil water content; Acacia mangium Willd; Schima wallichii Choisy; Cunninghamia lanceolata (Lamb; ) Hook
类别
资金
- National Natural Science Foundation of China [41630752, 31670410]
- National Key Research and Development Programme [2016YFC0500106-02]
- Guangzhou Science and Technology Project [201707010226]
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 (J(s)) in the dry and wet seasons. We measured the J(s) 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 J(s) 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.
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