TY - JOUR
T1 - Effects of species replacement on the relationship between net primary production and soil nitrogen availability along a topographical gradient
T2 - Comparison of belowground allocation and nitrogen use efficiency between natural forests and plantations
AU - Maeda, Yuka
AU - Tashiro, Naoaki
AU - Enoki, Tsutomu
AU - Urakawa, Rieko
AU - Hishi, Takuo
N1 - Funding Information:
This study was partly supported by JSPS KAKENHI (No. JP19780118 and JP22248016). Thanks to the technical staff of ARF for their support in the establishment of the study plot, vegetation census, and GIS data calculations. We would like to thank Editage (www.editage.jp) for English language editing.
Funding Information:
This study was partly supported by JSPS KAKENHI (No. JP19780118 and JP22248016 ). Thanks to the technical staff of ARF for their support in the establishment of the study plot, vegetation census, and GIS data calculations. We would like to thank Editage ( www.editage.jp ) for English language editing.
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/8/15
Y1 - 2018/8/15
N2 - Changes in dominant plant species can influence the net primary production (NPP) via changes in species traits, including nitrogen use efficiency (NUE) and belowground allocation enhancing N uptake, as well as soil N availability. We investigated changes in above- and belowground NPP, N uptake, and NUE in response to changes in soil N in natural forests and plantations, with and without changes in species compositions among the environmental gradient, respectively. In plantations, NPP increased with increasing availability of soil N in the presence of constant NUE and the proportion of belowground NPP to total NPP. However, in natural forests, aboveground, belowground, and total NPP were high for the available middle range soil N. Belowground NPP and the proportion of belowground NPP to total NPP in natural forests was positively related to aboveground NPP. Both belowground NPP and soil N mineralization rates explained stand N uptake rates. These results indicated that belowground allocation might facilitate aboveground NPP with enhancement of N uptake by root allocation. Stand NUE decreased with soil N availability in natural forests and was stable in plantations, and resulted in lower production in natural forests and higher production in plantations under high soil N availability. The community weighted mean (CWM) of N resorption efficiency was positively related to NUE. The CWM of juvenile root growth, as reported previously for planted juveniles, was positively related to belowground NPP allocation. In addition, the ranges of CWMs were broader in natural forests than in plantations. This suggested that the different changes in NPP in response to changes in soil N between natural forests and plantations was due to the changes in leaf and root species traits via changing in species composition among sites. In conclusion, the present study showed that the changes in species specific traits in root growth and leaf N strongly affected the relationship between soil N availability and stand carbon and N dynamics.
AB - Changes in dominant plant species can influence the net primary production (NPP) via changes in species traits, including nitrogen use efficiency (NUE) and belowground allocation enhancing N uptake, as well as soil N availability. We investigated changes in above- and belowground NPP, N uptake, and NUE in response to changes in soil N in natural forests and plantations, with and without changes in species compositions among the environmental gradient, respectively. In plantations, NPP increased with increasing availability of soil N in the presence of constant NUE and the proportion of belowground NPP to total NPP. However, in natural forests, aboveground, belowground, and total NPP were high for the available middle range soil N. Belowground NPP and the proportion of belowground NPP to total NPP in natural forests was positively related to aboveground NPP. Both belowground NPP and soil N mineralization rates explained stand N uptake rates. These results indicated that belowground allocation might facilitate aboveground NPP with enhancement of N uptake by root allocation. Stand NUE decreased with soil N availability in natural forests and was stable in plantations, and resulted in lower production in natural forests and higher production in plantations under high soil N availability. The community weighted mean (CWM) of N resorption efficiency was positively related to NUE. The CWM of juvenile root growth, as reported previously for planted juveniles, was positively related to belowground NPP allocation. In addition, the ranges of CWMs were broader in natural forests than in plantations. This suggested that the different changes in NPP in response to changes in soil N between natural forests and plantations was due to the changes in leaf and root species traits via changing in species composition among sites. In conclusion, the present study showed that the changes in species specific traits in root growth and leaf N strongly affected the relationship between soil N availability and stand carbon and N dynamics.
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U2 - 10.1016/j.foreco.2018.03.046
DO - 10.1016/j.foreco.2018.03.046
M3 - Article
AN - SCOPUS:85045305330
SN - 0378-1127
VL - 422
SP - 214
EP - 222
JO - Forest Ecology and Management
JF - Forest Ecology and Management
ER -