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Growing season moisture drives interannual variation in woody productivity of a temperate deciduous forest
Author(s) -
Helcoski Ryan,
Tepley Alan J.,
Pederson Neil,
McGarvey Jennifer C.,
Meakem Victoria,
Herrmann Valentine,
Thompson Jonathan R.,
AndersonTeixeira Kristina J.
Publication year - 2019
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.15906
Subject(s) - deciduous , temperate deciduous forest , environmental science , productivity , growing season , temperate climate , climate change , ecosystem , primary production , temperate forest , forest ecology , ecology , biology , economics , macroeconomics
Summary The climate sensitivity of forest ecosystem woody productivity ( ANPP stem ) influences carbon cycle responses to climate change. For the first time, we combined long‐term annual growth and forest census data of a diverse temperate broadleaf deciduous forest, seeking to resolve whether ANPP stem is primarily moisture‐ or energy‐limited and whether climate sensitivity has changed in recent decades characterised by more mesic conditions and elevated CO 2 . We analysed tree‐ring chronologies across 109 yr of monthly climatic variation (1901–2009) for 14 species representing 97% of ANPP stem in a 25.6 ha plot in northern Virginia, USA. Radial growth of most species and ecosystem‐level ANPP stem responded positively to cool, moist growing season conditions, but the same conditions in the previous May–July were associated with reduced growth. In recent decades (1980–2009), responses were more variable and, on average, weaker. Our results indicated that woody productivity is primarily limited by current growing season moisture, as opposed to temperature or sunlight, but additional complexity in climate sensitivity may reflect the use of stored carbohydrate reserves. Overall, while such forests currently display limited moisture sensitivity, their woody productivity is likely to decline under projected hotter and potentially drier growing season conditions.