Abstract
Recent climate changes, including an increase in precipitation, have affected tree physiology in eastern Siberia. We investigated the response of larch to wet and dry soil water conditions in pot experiments using larch seedlings grown under near-natural conditions in eastern Siberia over two growing seasons. Three patterns of wet- and dry-treatment combinations were applied over 2 years: wet treatments in 2006 and 2007 (WW treatment), dry in 2006 and wet in 2007 (DW treatment), and dry in 2006 and 2007 (DD treatment). After 1 year of treatment, no significant difference between the dry and wet treatment was found in root distribution and needle water content, except for the content of abscisic acid in roots. After 2 years of treatment, the DW treatment induced different tendencies in the gas exchange activity and in the needle biomass and root distribution of seedlings in comparison with WW treatments, despite the same water condition in 2007. We suggest a possibility that seedlings that experience drought stress might store some memory of drought that influences their physiology in the next growing season.
Highlights
Climate change has been attracting much attention because of an increase in the frequency and magnitude of ex-How to cite this paper: Takenaka, C., Miyahara, M., Ohta, T. and Maximov, T.C. (2016) Effects of Two-Year Variation in Soil Moisture Condition on the Development of Larch Root System in Eastern Siberia
Ohta et al (2014) [2] reported that the number of living larch decreased in forests by 15% from 1998 to 2011, and that the annual precipitation pattern was classified into three phases: normal years from 1998 to 2000 and from 2009 to 2011, dry years from 2001 to 2004, and wet years from 2005 to 2008 in eastern Siberia
In pot experiments with seedlings of Larix gmelinii, a typical larch species in eastern Siberia, we found that the allocation of photosynthetic products to roots and root respiration were lower under wet than those under dry conditions [6]
Summary
Climate change has been attracting much attention because of an increase in the frequency and magnitude of ex-How to cite this paper: Takenaka, C., Miyahara, M., Ohta, T. and Maximov, T.C. (2016) Effects of Two-Year Variation in Soil Moisture Condition on the Development of Larch Root System in Eastern Siberia. Climate change has been attracting much attention because of an increase in the frequency and magnitude of ex-. According to the IPCC prediction, both precipitation and air temperature will increase in eastern Siberia. The summer precipitation pattern has been yearly changing in eastern Siberia [2] [3]. Ohta et al (2014) [2] reported that the number of living larch decreased in forests by 15% from 1998 to 2011, and that the annual precipitation pattern was classified into three phases: normal years from 1998 to 2000 and from 2009 to 2011, dry years from 2001 to 2004, and wet years from 2005 to 2008 in eastern Siberia. The unusual waterlogging occurred in wet years is suspected as one cause of recent decline in the larch forest
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
