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Title:
Main Experiment: Phosphorus fractions of soils (Site A)
Access rights:
Free within projects
Usage rights:
No information available
Published:
Master Thesis Peters F. (2015): Can diversity overcome nutirent limitation in a young afforested stand in sub-tropical China; Chair of Silviculture; Faculty of Environment and Natural Resources, Albert-Ludwigs Universität Freiburg im Breisgau, Germany.
Abstract:
Soil chemical laboratory analyses of 30 plots of site A of experimental study plots at Xingangshan. Samples were taken and provided from Thomas Scholten and Peter Kühn (Tübingen University). Analysis was done at Freiburg University with the Hedley fractionation method (Modification by Tiessen & Moir, 1993) for the top three (0-5, 5-10, 10-20cm) depth increments.
Design:
Samples were provided from Thomas Scholten and Peter Kühn from Tübingen University Department Soil science and Geomorphology. 3 depths (0-5, 5-10, 10-20 cm) were used airdried and sieved < 2 mm.
Spatial extent:
Experimental Site A 29°08'-29°11'N 117°90'-117°93'E
Temporal extent:
Samples were collected from 2010 to 2011.
Taxonomic extent:
No information available
Measurement cirumstances:
No information available
Data analysis:
Phosphorus fractions in soils were analyzed by the sequential extraction method according to Hedley (Hedley et al. 1982a). The whole fractionation process used for this data is described in detail by Tiessen and Moir (2008). The organic fractions were calculated while substracting the measured inorganic fraction from the measured total P of the same extract. The general usefulness of this method to determine P in fractions of distinctly different solubility is widely discussed (Condron and Newman 2011, Cross and Schlesinger 1995, Yang and Post 2011). The individual fractions can be described as readily soluble and exchangeable Pi (Pi Resin), desorbable Pi (pi_nahco3) and readily mineralizable Po (po_nahco3), Fe/Al associated Pi (pi_naoh, pi_naoh_s) and Fe/Al associated Po (po_naoh, po_naoh_s), Ca associated Pi (pi_1mhcl, pi_hcl_conc), Ca associated Po (po_hcl_conc), and residual P (tp_residual). For the purpose of subsequent statistical analyses, the Hedley fractions can be grouped by their solubility in labile (pi_resin, pi_nahco3 and po_nahco3), moderate labile (pi_naoh, pi_naoh_s, po_naoh, po_naoh_s, pi_1mhcl) and stable P pools (pi_hcl_conc, po_hcl_conc, tp_residual) as commonly found in literature. (Cross and Schlesinger 1994, de Schrijver et al. 2011, Stevenson and Cole 1999, Yang and Post 2011).

Filter:
Dataset column

Name:
lab_num
Definition:
laboratory number of laboratory of soil science and geomorphology in Tübingen;
Unit:
No information available
Datagroup:
Laboratory number of Laboratory of Soil Science and Geomorphogy in Tübingen
Keywords:
No information available
Values:
4890
4889
4888
5239
5238
Contributors:
No information available

Dataset column

Name:
Site
Definition:
Experimental Site of the BEF-China Experiment
Unit:
No information available
Datagroup:
Experimental Site
Keywords:
No information available
Values:
A
Contributors:
No information available

Dataset column

Name:
Plot
Definition:
Plot within the experimental site
Unit:
No information available
Datagroup:
BEF research plot name
Keywords:
No information available
Values:
E34
F22
E24
F21
C32
Contributors:
No information available

Dataset column

Name:
Increment
Definition:
Depth increment of the soil core (cm range)
Unit:
No information available
Datagroup:
Soil depth
Keywords:
No information available
Values:
5-10
0-5
10-20
Contributors:
No information available

Dataset column

Name:
pi_resin
Definition:
Inorganic P extracted with Resin bags in 20ml H20 for 16hrs, measured in 0.5M HCL
Unit:
µg/g
Datagroup:
Phosphorus
Keywords:
No information available
Values:
10.184384999999999
10.15291
10.134419999999999
10.26897
0.21114
Contributors:

Dataset column

Name:
pi_nahco3
Definition:
Inorganic P measured in Extract which was shaken in 25ml NaHCO3 for 16hrs
Unit:
µg/g
Datagroup:
Phosphorus
Keywords:
No information available
Values:
1.384695
1.24338
1.3258649999999998
1.36998
0.98692
Contributors:

Dataset column

Name:
po_nahco3
Definition:
Organic P measured in Extract which was shaken in 25ml NaHCO3 for 16hrs
Unit:
µg/g
Datagroup:
Phosphorus
Keywords:
No information available
Values:
11.51039
11.64288
11.171895
11.48501
10.05394
Contributors:

Dataset column

Name:
pi_naoh
Definition:
Inorganic P measured in Extract which was shaken in 25ml NaOH for 16hrs
Unit:
µg/g
Datagroup:
Phosphorus
Keywords:
No information available
Values:
11.74294
11.85416
11.74827
10.26119
11.514195
Contributors:

Dataset column

Name:
po_naoh
Definition:
Organic P measured in Extract which was shaken in 25ml NaOH for 16hrs
Unit:
µg/g
Datagroup:
Phosphorus
Keywords:
No information available
Values:
116.89179000000001
115.79262
106.10497
113.71524000000001
115.302405
Contributors:

Dataset column

Name:
pi_naoh_s
Definition:
Inorganic P measured in Extract which was sonicated in 20ml NaOH for 20min
Unit:
µg/g
Datagroup:
Phosphorus
Keywords:
No information available
Values:
10.96287
10.96644
10.44407
13.93064
12.75446
Contributors:

Dataset column

Name:
po_naoh_s
Definition:
Organic P measured in Extract which was sonicated in 20ml NaOH for 20min
Unit:
µg/g
Datagroup:
Phosphorus
Keywords:
No information available
Values:
10.78425
10.16419
10.13137
10.452480000000001
10.96693
Contributors:

Dataset column

Name:
pi_1mhcl
Definition:
Inorganic P extracted with 20ml 1m HCL for 16hrs
Unit:
µg/g
Datagroup:
Phosphorus
Keywords:
No information available
Values:
0
0.00961
0.03783
0.04705
0.05758
Contributors:

Dataset column

Name:
pi_hcl_conc
Definition:
Inorganic P measured in Extract which was cooked with 10ml concentrated HCL at 85°C for 20min, after that added an extra 5ml concentrated HCL
Unit:
µg/g
Datagroup:
Phosphorus
Keywords:
No information available
Values:
111.232295
109.59374
103.93327
101.46147
107.664285
Contributors:

Dataset column

Name:
po_hcl_conc
Definition:
Organic P measured in Extract which was cooked with 10ml concentrated HCL at 85°C for 20min, after that added an extra 5ml concentrated HCL
Unit:
µg/g
Datagroup:
Phosphorus
Keywords:
No information available
Values:
10.602339999999998
0
0.32626999999999384
10.533355000000029
10.582399999999993
Contributors:

Dataset column

Name:
tp_residual
Definition:
Total residual P extracted with HNO3-Pressure-Extraction method
Unit:
µg/g
Datagroup:
Phosphorus
Keywords:
No information available
Values:
104.48348
120.726495
120.62321
107.51767
165.78559
Contributors:

Dataset column

Name:
tp_initial
Definition:
Total P after digestion with concentrated nitric acid; 400 mg +3 ml HNO3, 8h 190°C under pressure
Unit:
µg/g
Datagroup:
Phosphorus
Keywords:
No information available
Values:
247.29925
235.81935
254.24915
261.92293333333333
261.0073
Contributors:
No information available

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Jürgen
Bauhus

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Björn
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