NILEx tracer (leaf): decomposition rates of leaves and plot topography data

Usage Rights

This data is Free within projects.

Usage rights: dataset is available on request for all Tracer NILEx members;

Acknowledgement of non members: Manuel Hiß, Mr. Qi and other Chinese helpers (fieldwork), Benjamin Plaga and German helpers (labwork)

Dataset Abstract

Leaf decomposition plays an important role in ecosystem biogeochemistry. Nutrients are released from decomposing litter by leaching of soluble substances and the break-down by animals, microbes and fungi, and will thus become again available for uptake by plants. These decomposition processes might be influenced by the composition and diversity of litter species. To gain a deeper understanding about the relationships between litter diversity, nutrient cycling and uptake by plants, we established a leaf decomposition experiment at the forest rim of Site A in a small natural forest.

Dataset Design

Unlabelled, and 15N and Li labelled leaves of the native tree species Sapindus saponaria, Quercus actusissima and Schima superba were used to create 1-, 2- and 3-species mixtures with one species labelled each per mixture. In total, 12 plots with all possible mixtures were replicated three times arranged in three blocks. Leaves of the respective species mixtures were placed in mesocosms together with one phytometer plant (Carex spec.). Over a timeperiode of six month, leaves and phytometer plants of each mixture were recovered in four timesteps (after 12, 37, 101 an 171 days). All leaves were cleaned, separated into species, dried at 40°C, weighted and analyzed for their Li and 15N content. 15N analysis were also carried out with the leaves and roots of the respective phytometer plant.

Spatial Extent

Small forest at the rim of site A

Temporal Extent

April 2011 - October 2011

Taxonomic Extent

The 15N an Li labelled and unlabelled leaves of tree native tree species were used: Sapindus saponaria, Schima superba, Quercus acutissima. The trees were transplanted to a field near site B from a nursery in Dexing in spring 2011. The senescend leaves were colledcted in autumn 2011.

Measurement Circumstances

hot, many moscitos

Data Analysis

Calculation of decomposition rate constant k with the negative exponential function.

Data columns available in the raw data part of this dataset

plot_ID
Unique identity code for tracer nilex samples: TracerNILEx+Blocknumber+Plotnumber+Diversity+Samples in mixture; Datagroup description: Tracer New Integrated Litter Experiment
Data group: Helper
Keywords: Tracer Nilex, leaf decomposition rate
Values
T_B1_P05_D1_Sap
T_B1_P03_D1_Querc
T_B1_P09_D2_Querc_Schi
T_B1_P10_D2_Querc_Schi
T_B1_P07_D1_Schi
block
Number of the block of the TracerNILEx; Datagroup description: Tracer New Integrated Litter Experiment
Data group: Tracer NILEx Block
Keywords: Tracer Nilex, leaf decomposition rate
Values
B1
B3
B2
plot
Numer of the plot within the TracerNILEx. Note: only becomes unique in combination with the information on Block.
Data group: Tracer NILEx Plot
Keywords: Tracer Nilex, leaf decomposition rate
Values
P03
P04
P06
P07
P05
diversity
leaf litter species diversity in the mesocosms
Data group: Tracer NILEx Diversity
Keywords: Tracer Nilex, leaf decomposition rate
Values
D3
D2
D1
composition
species in litter mixture
Data group: Litter species composition
Keywords: Tracer Nilex, leaf decomposition rate
Values
Querc_Schi
Querc_Sap
Querc
Querc_Sap_Schi
Sap
inclination
inclination of the respective plot
Data group: Inclination
Values
11
10
14
12
1
aspect
aspect of the respective plot
Data group: Aspect
Values
139
146
150
156
152
k
leaf decomposition rate constant k; Datagroup description: Tracer New Integrated Litter Experiment
Unit: d-1
Data group: Decomposition
Keywords: Tracer Nilex, leaf decomposition rate
Values
0.00804624013454595
0.00436633589900467
0.00864801992965835
0.00727793030510077
0.0058183417843539
ssresid
sum of squares residuals; Datagroup description: Tracer New Integrated Litter Experiment
Data group: Uncertainity measure
Keywords: Tracer Nilex, leaf decomposition rate
Values
0.0661160744137443
0.0999748026828138
0.0749732520347089
0.106151789974557
0.0890753368566029