NDLI: Belowground responses of Picea asperata seedlings to warming and nitrogen fertilization in the eastern Tibetan Plateau

Content Provider	Springer Nature Link
Author	Liu, Qing Yin, Huajun Chen, Jinsong Zhao, Chunzhang Cheng, Xinying Wei, Yunyan Lin, Bo
Copyright Year	2011
Abstract	The impacts of global climatic change on belowground ecological processes of terrestrial ecosystems are still not clear. We therefore conducted an experiment in the subalpine coniferous forest ecosystem of the eastern edges of the Tibetan Plateau to study roots of Picea asperata seedlings and rhizosphere soil responses to soil warming and nitrogen availability from April 2007 to December 2008. The seedlings were subjected to two levels of temperature (ambient; infrared heater warming) and two nitrogen levels (0 or 25 g m$^{−2}$year$^{−1}$ N). We used a free air temperature increase from an overhead infrared heater to raise both air and soil temperature by 2.1 and 2.6°C, respectively. The results showed that warming alone significantly increased total biomass, coarse root biomass and fine root biomass of P. asperata seedlings. Both total biomass and fine root biomass were increased, but coarse root biomass was significantly decreased by nitrogen fertilization and warming combined with nitrogen fertilization. Warming induced a prominent increase in soil organic carbon (SOC) and NO$_{3}$ $^{−}$-N of rhizosphere soil, while nitrogen fertilization significantly decreased SOC and NH$_{4}$ $^{+}$-N of rhizosphere soil. The warming, fertilization and warming × N fertilization interaction decreased soil microbial C significantly, but substantially increased soil microbial N. These results suggest that nitrogen deposition combined with warmer temperatures under future climatic change possibly will have no effect on fine root production of P. asperata seedlings, but could enhance the nitrification process of their rhizosphere soils in subalpine coniferous forests.
Starting Page	637
Ending Page	648
Page Count	12
File Format	PDF
ISSN	09123814
Journal	Ecological Research
Volume Number	26
Issue Number	3
e-ISSN	14401703
Language	English
Publisher	Springer Japan
Publisher Date	2011-04-12
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Picea asperata Root Rhizosphere microbial process Rhizosphere soil process Plant Sciences Ecology Behavioural Sciences Forestry Evolutionary Biology Zoology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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