NILEx tracer (wood): wood samples N measurements via mass spectrometry

Usage Rights

This data is Private.

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Dataset Abstract

These data were complied related to the question: Is there evidence for lateral N-transport from leaf litter to dead wood? Wood slices of different species (Pinus massonina, Schima superba, Quercus serrata) placed at different divers 15N labeled leaf litter mixture layers (of tree differenzt species: Schima superba, Quercus acutissima, Sapindus mukorossi). Two different decomposition periods were observed. Afterwards the decomposed wood slices were analysed via mass spectrometry regarding to their total N content and their 15N content.

Dataset Design

The 15N transport from leaf litter to dead wood of three different wood species were analysed. It was tested if there were differences in N transport related to decomposition period, wood species, diversity level of leaf mixtures and to the combination of wood species and leaf species.

Spatial Extent

Subtropical China, near site A, Xingangshan, Jiangxi

Published

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Temporal Extent

Wood slices were placed at 16./17.04.2012 in the field and were harvested at 16.07.2012 (after 3 months) and 07.10.2012 (after 6 months). The analysis of wood samples via mass spectrometer took place from March to June 2016.

Taxonomic Extent

Wood species: Pinus massoniana, Quercus serrata, Schima superba

Measurement Circumstances

Are there circumstances that explain the precision of your measurements? Could it be that a sandstorm destroyed part of the plots in a given year?

Data Analysis

Parameters of interest were total N content (%) and 15N content (Δ vs. air) of wood samples. Both were analysed by mass spectrometry (Delta V Advantage, 0.7 mg sample in tin capsules 9x15mm)

Data columns available in the raw data part of this dataset

sample-ID
sample-ID to identify a respective sample (e.g. for further use of the physical sample in a lab analysis). The first five digits show the laboratory number, the letter show the wood species (Pinus massonina (P), Quercus serrata (Q), Schima superba (S)) and the last digit shows the tree number.
Data group: Identifier
Values
00006 P5
00008 P6
00004 P5
00002 P5
00010 P6
species
species anes according to the Flora of China
Data group: Scientific plant species name
Values
Quercus serrata
Pinus massoniana
Schima superba
* wood species from which the sample has arisen category also contributed to this column.
tree
Tree individual of which the sample has arisen (tree number 1-4 for Schima superba, tree number 5-6 for Pinus massoniana and tree number 7-10 for Quercus serrata).
Data group: Helper
Values
Ind_10
Ind_4
Ind_2
Ind_3
Ind_1
* tree individual of which the sample has originated (tree number 1-10) category also contributed to this column.
harvest
t0: samples of wood slices which have never been exposed in the field (undecomposed samples) t1: samples which have been collected at the first sampling period (see respective date). t2: samples which have been collected at the first sampling period (see respective date).
Data group: time of decomposition
Values
t0
t2
t1
* point of time when the sample was taken out of testing field (t0, t1, t2) category also contributed to this column.
mesh
c:samples of wood slices which were packed into coarse meshed bags (7mm mesh size) f:samples of wood slices which were packed into fine meshed bags (0.25 mm mesh size)
Data group: Treatment
Values
c
f
* gaze treatment - slices were packed in fine (025mm) or coarse (7mm) meshed gaze (f or c) category also contributed to this column.
block-plot
Information on the position of the respective sample within the randomized design of the TracerNILEx. First digit indicates Blick, second digit indicates plot within the respective block
Data group: Tracer NILEx Plot
Values
1-2
1-11
1-20
1-14
1-15
diversity
1.0, leaf litter mixture containing one leaf species (monoculture) 2.0, leaf litter mixture containing two leaf species 3.0, leaf litter mixture containing three leaf species
Data group: Tracer NILEx Diversity
Values
1
3
2
* diversity of leaves species mixtures (1, 2 or 3 species in mixture) category also contributed to this column.
labeled
Indicates, which of the leaf litter species in the mixture was labelled with 15N
Data group: TracerNILEx Treatment (15N Labeling)
Values
Sch
Que
Sap
* leaf species in mixture which is labeled by the heavy isotope 15N category also contributed to this column.
N
Content of Nitrogen (total nitrogen) in the sample
Unit: %
Data group: Nitrogen
Keywords: nitrogen, nutrients
Values
0.060181150262763
0.0618670225575025
0.0596447512457592
0.0629889134033267
0.0567553411618887
15N
Delta 15N of the respecitve sample (using natural 15N abundances in the air as reference)
Data group: Stable isotope
Keywords: d15N
Values
-0.090081569321886
-0.0384228473835548
-0.0439263617546626
0.11534129151212
-0.168744021389691