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- W2063236591 abstract "Multiple soil resources could limit aboveground net primary production (ANPP) in temperate forests, but most studies have focused on nitrogen (N) availability. We tested a suite of resources including water, multiple measures of N, phosphate (PO4), and extractable ions (calcium (Ca), potassium (K), magnesium (Mg)) as correlates of ANPP across a glacial landform gradient in northwestern Lower Michigan. Our goals were to identify resource correlates of ANPP that could potentially limit productivity, to characterize productivity partitioning to leaves (ANPPL) and wood (ANPPW) across the gradient, and to test soil resource correlates of partitioning. We measured soil resource availability and annual ANPP at 13 sites, and fit models of ANPPW and ANPPL as functions of each resource. We used Akaike's Information Criterion to assess empirical support for models with different functional forms. ANPPW was best correlated with Ca, with a relationship that was asymptotic beyond the four lowest-productivity sites. Both Mg and K covaried with Ca; Mg was also supported as an ANPPW correlate. Soil water and sum of ammonium (NH4) and nitrate (NO3) (ΣN) explained substantial ANPPW variance, but with weaker support than for Ca. ANPPL was best correlated with ΣN; NO3 received support, while Ca received less support but still explained substantial ANPPL variance. These results suggest a potential role for Ca in regulating ANPP, at least in low-productivity sites, while reaffirming the importance of both N and water availability. Partitioning of annual production to ANPPW as a fraction of total ANPP was related to Ca and soil water, but only weakly to ΣN. Production was partitioned equally between ANPPL and ANPPW at low fertility, but ANPPW exceeded ANPPL by 24% at maximum productivity. Given this shift in partitioning, measuring only ANPPW but assuming that ANPPL scales proportionately would overestimate ANPP at higher fertility sites. Although correlative, our results suggest that ANPP is constrained by some combination of N, Ca, and water, and provide motivation for experimental manipulations of these resources to better understand forest responses to human influences. If northern temperate forests are strictly N-limited, as suggested by much of the literature, then anthropogenic N deposition should enhance ANPP. In contrast, if ANPP is limited, or co-limited, by Ca or by soil water, then anthropogenic change (altered precipitation, base cation leaching), could counteract production gains from N deposition." @default.
- W2063236591 created "2016-06-24" @default.
- W2063236591 creator A5034032963 @default.
- W2063236591 creator A5045451408 @default.
- W2063236591 creator A5060279143 @default.
- W2063236591 date "2010-07-01" @default.
- W2063236591 modified "2023-10-16" @default.
- W2063236591 title "Soil calcium, nitrogen, and water are correlated with aboveground net primary production in northern hardwood forests" @default.
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- W2063236591 doi "https://doi.org/10.1016/j.foreco.2010.05.029" @default.