NDLI: The measurement of woody root decomposition using two methodologies in a Sitka spruce forest ecosystem

Content Provider	Springer Nature Link
Author	Olajuyigbe, Samuel Tobin, Brian Hawkins, Michael Nieuwenhuis, Maarten
Copyright Year	2012
Abstract	The decomposition of roots is an important process in the loss of carbon (C) and the mineralization of nitrogen (N) in forest ecosystems. The early stage decomposition rate of Sitka spruce (Picea sitchensis (Bong.) Carr.) roots was determined using trenched plots and decomposition bags.Stumps of known age were trenched and quadrants (50 cm by 50 cm) excavated from randomly selected stumps every 6 months over 4 years, while the mass loss from buried roots in decomposition bags, divided among four diameter categories (ranging from fine roots <2 mm to large roots >50 mm), was monitored for 27 months. The C and N concentrations of excavated samples at different time points were analysed.The change in total root necromass per quadrant showed a higher decomposition rate-constant (k) of 0.24 ± 0.068 year$^{−1}$ than the k-value of roots in decomposition bags (0.07 ± 0.005 year$^{−1}$). The C concentration (47.24 ± 0.609 %) did not significantly change with decomposition. There was a significant increase in the C:N ratio of roots in all diameter categories (fine: 48.92 %, small: 38.53 %, medium 11.71 %, large: 76.25 %) after 4 years of decomposition, driven by N loss. Root diameter accounted for 78 % of the variation in the N concentration of roots as decomposition progressed.Though the trenched plot approach offered an alternative to the more common decomposition bag method for estimating root decomposition, high spatial variation and sampling difficulties may lead to an overestimation of the mass loss from trenched roots, thus, the decomposition bag method gives a more reliable decomposition rate-constant.
Starting Page	77
Ending Page	91
Page Count	15
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	360
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-04-04
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Trenched plots Root diameter Root decomposition Decomposition bags C:N ratio Decomposition rate-constant Plant Sciences Plant Physiology Ecology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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