Pathogen-induced defoliation impacts on transpiration, leaf gas exchange, and non-structural carbohydrate allocation in eastern white pine (Pinus strobus)

被引:14
作者
McIntire, Cameron D. [1 ,2 ]
Huggett, Brett A. [3 ]
Dunn, Emma [3 ]
Munck, Isabel A. [1 ]
Vadeboncoeur, Matthew A. [4 ]
Asbjornsen, Heidi [2 ,4 ]
机构
[1] US Forest Serv, USDA, State & Private Forestry, 271 Mast Rd, Durham, NH 03820 USA
[2] Univ New Hampshire, Dept Nat Resources & Environm, 56 Coll Rd, Durham, NH 03824 USA
[3] Bates Coll, Dept Biol, 2 Andrews Rd, Lewiston, ME 04240 USA
[4] Univ New Hampshire, Earth Syst Res Ctr, 8 Coll Rd, Durham, NH 03824 USA
来源
TREES-STRUCTURE AND FUNCTION | 2021年 / 35卷 / 02期
关键词
White pine needle damage; Defoliation; Forest pathogen; Sap flux; Leaf gas exchange; Non-structural carbohydrates; SAP FLUX; CARBON LIMITATION; NEEDLE DAMAGE; STOMATAL CONDUCTANCE; PROCESSIONARY MOTH; GROWTH; TREES; DYNAMICS; STORAGE; WATER;
D O I
10.1007/s00468-020-02037-z
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
Key message Pathogen-induced defoliation resulted in a reduction in transpiration, an upregulation of photosynthesis in the early growing season, and no change in NSC reserves across stem, root, and foliar tissues. The defoliation of eastern white pine (Pinus strobusL.) by native fungi associated with white pine needle damage (WPND) can substantially reduce foliar area for much of the growing season in the northeastern United States. Chronic defoliations in the region are known to have slowed growth rates in symptomatic stands, but the physiological impacts of WPND as it relates to tree water use and carbon assimilation are largely unresolved. We investigated how the severity of WPND defoliation influences transpiration throughout the course of a growing season. We also assessed leaf-level gas exchange between defoliation severity classes and needle age over time. Finally, we compared concentrations of non-structural carbohydrates (NSC) between defoliation severity classes in five different tissue types over time. We found that trees experiencing a high-severity defoliation had 20% lower sap flux density compared to low-severity individuals. We found that rates of photosynthesis were significantly influenced by the needle age class and time of year, while instantaneous water use efficiency was higher across all needle age classes late in the growing season. Our findings suggest that the residual current-year foliage of high-severity defoliated trees compensated for the loss of mature second- and third-year foliage in the early portion of the growing season. This study found that soluble sugars and starch varied significantly over time and by tissue type, but defoliation severity had little effect on NSC concentrations. Together with reduced basal area increment in high-severity trees relative to low-severity trees, this indicates that WPND-affected trees are prioritizing NSC storage over secondary growth.
引用
收藏
页码:357 / 373
页数:17
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