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The influence of drought intensity on soil respiration during and after multiple drying-rewetting cycles

Li, Jintao LU ; Wang, Jun-Jian ; Zeng, De-Hui ; Zhao, Shan-Yu ; Huang, Wan-Ling ; Sun, Xue-Kai and Hu, Ya-Lin (2018) In Soil Biology & Biochemistry 127. p.82-89
Abstract
Global climate change is projected to intensify soil drying-rewetting (DRW) events with extended drought, especially in arid and semiarid ecosystems. However, the extent to which the soil DRW with intensified drought can alter soil respiration (Rs) in forests is still under debate, and subsequent legacy effects on Rs are not well understood. Here, we conducted a 180-d soil incubation experiment to investigate how soil DRW with different drought intensities alter the Rs in poplar (Populus simonii) and Mongolian pine (Pinus sylvestris var. mongolica) plantations. The incubation experiment included four 30-d cycles of 1) constant moisture treatment (control), 2) DRW with 10-d drying and 20-d rewetting (DRW10-20) or 3) DRW with 20-d drying and... (More)
Global climate change is projected to intensify soil drying-rewetting (DRW) events with extended drought, especially in arid and semiarid ecosystems. However, the extent to which the soil DRW with intensified drought can alter soil respiration (Rs) in forests is still under debate, and subsequent legacy effects on Rs are not well understood. Here, we conducted a 180-d soil incubation experiment to investigate how soil DRW with different drought intensities alter the Rs in poplar (Populus simonii) and Mongolian pine (Pinus sylvestris var. mongolica) plantations. The incubation experiment included four 30-d cycles of 1) constant moisture treatment (control), 2) DRW with 10-d drying and 20-d rewetting (DRW10-20) or 3) DRW with 20-d drying and 10-d rewetting (DRW20-10), and then an extended 60-d incubation under constant moisture. During the four DRW cycles, the direct C release with respiration of Mongolian pine soils (27 g C·m−2 in DRW10-20 and 140 g C·m−2 in DRW20-10, respectively) decreased to a much lower extent than that of poplar soils (228 g C·m−2 in DRW10-20 and 498 g C·m−2 in DRW20-10, respectively). Rs did not significantly change during the extended 60-d incubation in the DRW10-20 treatment compared to control treatment. However, the respired CO2 were increased by 68 g C·m−2 in the poplar soils and 19 g C·m−2 in the Mongolian pine soils in the DRW20-10 treatment, which approximately compensated for 14% of the decreases of total respiration during four DRW cycles. This legacy effect induced by the DRW with intensified drought was attributed to the higher amount of remaining substrates and soil microbial biomass. Our study highlights that DRW can cause both direct and legacy effects on Rs, but the effects vary with drought intensity and forest type.
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publishing date
type
Contribution to journal
publication status
published
in
Soil Biology & Biochemistry
volume
127
pages
82 - 89
publisher
Elsevier
external identifiers
  • scopus:85054688754
ISSN
0038-0717
DOI
10.1016/j.soilbio.2018.09.018
language
English
LU publication?
no
id
adccbb6b-57cb-45db-800c-fd51026d5be0
date added to LUP
2022-03-08 12:57:37
date last changed
2022-06-02 04:15:03
@article{adccbb6b-57cb-45db-800c-fd51026d5be0,
  abstract     = {{Global climate change is projected to intensify soil drying-rewetting (DRW) events with extended drought, especially in arid and semiarid ecosystems. However, the extent to which the soil DRW with intensified drought can alter soil respiration (Rs) in forests is still under debate, and subsequent legacy effects on Rs are not well understood. Here, we conducted a 180-d soil incubation experiment to investigate how soil DRW with different drought intensities alter the Rs in poplar (Populus simonii) and Mongolian pine (Pinus sylvestris var. mongolica) plantations. The incubation experiment included four 30-d cycles of 1) constant moisture treatment (control), 2) DRW with 10-d drying and 20-d rewetting (DRW10-20) or 3) DRW with 20-d drying and 10-d rewetting (DRW20-10), and then an extended 60-d incubation under constant moisture. During the four DRW cycles, the direct C release with respiration of Mongolian pine soils (27 g C·m−2 in DRW10-20 and 140 g C·m−2 in DRW20-10, respectively) decreased to a much lower extent than that of poplar soils (228 g C·m−2 in DRW10-20 and 498 g C·m−2 in DRW20-10, respectively). Rs did not significantly change during the extended 60-d incubation in the DRW10-20 treatment compared to control treatment. However, the respired CO2 were increased by 68 g C·m−2 in the poplar soils and 19 g C·m−2 in the Mongolian pine soils in the DRW20-10 treatment, which approximately compensated for 14% of the decreases of total respiration during four DRW cycles. This legacy effect induced by the DRW with intensified drought was attributed to the higher amount of remaining substrates and soil microbial biomass. Our study highlights that DRW can cause both direct and legacy effects on Rs, but the effects vary with drought intensity and forest type.<br/>}},
  author       = {{Li, Jintao and Wang, Jun-Jian and Zeng, De-Hui and Zhao, Shan-Yu and Huang, Wan-Ling and Sun, Xue-Kai and Hu, Ya-Lin}},
  issn         = {{0038-0717}},
  language     = {{eng}},
  pages        = {{82--89}},
  publisher    = {{Elsevier}},
  series       = {{Soil Biology & Biochemistry}},
  title        = {{The influence of drought intensity on soil respiration during and after multiple drying-rewetting cycles}},
  url          = {{http://dx.doi.org/10.1016/j.soilbio.2018.09.018}},
  doi          = {{10.1016/j.soilbio.2018.09.018}},
  volume       = {{127}},
  year         = {{2018}},
}