CSPs: Phosphorus fractions of soils: depth increments of 27 Comparative Study Plots

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Dataset Abstract

Soil chemical laboratory analyses of all 27 comparative study plots. Anaylsis done with the Hedley fractionation method (Modification by Tiessen & Moir, 1993) for the top three (0-5, 5-10, 10-20cm) of the six depth increments of each CSP

Dataset Design

Depth increments were taken from systematic corings: 1 coring per subplot means 9 corings per CSP. Samples were bulked from the 9 corings to one sample per depth increment (0-5, 5-10, 10-20 cm.), so that 3 samples exist per CSP. samples were air-dried, sieved < 2mm, using approx. 500mg per sample for analysis with hedley fractionation method (a sequential extraction method for organic and inorganic P fractions), photometric measurement of Phosphorus with molybdenum blue method according to Murphy & Riley (1962).

Spatial Extent

The Gutianshan National Nature Reserve (NNR) is located in the western part of Zhejiang Province (29º8'18" – 29º17'29" N, 118º2'14" – 118º11'12" E, Fig. 1). The Gutianshan NNR has an area of approximately 81 km2. From 27 comparative study plots (CSPs) soil samples were taken in 3 depth increments per CSP

Published

Todt, B., et al. "Use of near-infrared spectroscopy to assess phosphorus fractions of different plant availability in forest soils." Biogeosciences Discussions 12.1 (2015): 555-592.

Temporal Extent

Samples were collected 2008 and 2009 (SP6). Lab analyses were carried from 2011 to 2012 (SP12)

Taxonomic Extent

no organisms

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 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).

Data columns available in the raw data part of this dataset

lab_num
laboratory number of laboratory of soil science and geoecology in Tübingen; Datagroup description: Laboratory number of Laboratory of Soil Science and Geoecology in Tübingen
Data group: Laboratory number of Laboratory of Soil Science and Geoecology in Tübingen
Keywords: soil base
Values
3379
3380
3378
3386
3385
CSP
Number of the Comparative Study Plot; Datagroup description: BEF research plot name; Datagroup description: Reasearch plots of the Biodiversity - Ecosystem functioning experiment (BEF-China). Comparative Study Plots (CSP) in the Gutianshan Nature Reserve, having a size of 30x30m^2, measured on the ground.
Data group: BEF research plot name
Values
CSP03
CSP05
CSP01
CSP04
CSP02
depth
depth in cm
Unit: cm
Data group: Soil depth
Values
5
10
20
pi_resin
Inorganic P extracted with Resin bags in 20ml H20 for 16hrs, measured in 0.5M HCL
Unit: µg/g
Data group: Phosphorus
Values
11.035289825383455
10.493906073455673
10.20451527503136
10.48578896043179
11.227761532246893
* Nitschke, R. also contributed to this column.
pi_nahco3
Inorganic P measured in Extract which was shaken in 25ml NaHCO3 for 16hrs
Unit: µg/g
Data group: Phosphorus
Values
0.12150338399493742
0.14047570437122722
0.1881725093033342
0.007099137490006698
0.1109832650766177
* Nitschke, R. also contributed to this column.
po_nahco3
Organic P measured in Extract which was shaken in 25ml NaHCO3 for 16hrs
Unit: µg/g
Data group: Phosphorus
Values
0.23627032311310614
0.3599946284634581
0.5823875027175891
0.5522655641680364
0.5662750607713736
* Nitschke, R. also contributed to this column.
pi_naoh
Inorganic P measured in Extract which was shaken in 25ml NaOH for 16hrs
Unit: µg/g
Data group: Phosphorus
Values
10.95664761592234
10.110835368932271
11.27869723203745
10.513440767934263
11.107848792618096
* Nitschke, R. also contributed to this column.
po_naoh
Organic P measured in Extract which was shaken in 25ml NaOH for 16hrs
Unit: µg/g
Data group: Phosphorus
Values
10.839071725286027
10.367710256064356
11.71595558728081
102.13543040245601
119.47006948527986
* Nitschke, R. also contributed to this column.
pi_naoh_s
Inorganic P measured in Extract which was sonicated in 20ml NaOH for 20min
Unit: µg/g
Data group: Phosphorus
Values
0.18491391403115526
0.2154753934264552
0.05166266101551826
0.07522782492739606
0.1621994266921325
* Nitschke, R. also contributed to this column.
po_naoh_s
Organic P measured in Extract which was sonicated in 20ml NaOH for 20min
Unit: µg/g
Data group: Phosphorus
Values
0.7833056073473503
0.7169958035884284
0.5170738853827741
0.876432297243403
0.8531862839253517
* Nitschke, R. also contributed to this column.
pi_1mhcl
Inorganic P extracted with 20ml 1m HCL for 16hrs
Unit: µg/g
Data group: Phosphorus
Values
0.02145524534400514
0.02306093388670001
0
0.00977624824165193
0.0015653066661651949
* Nitschke, R. also contributed to this column.
pi_hcl_conc
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
Data group: Phosphorus
Values
10.24225607236551
10.178105817599826
10.698757660037279
10.339698692723834
10.760818035902824
* Nitschke, R. also contributed to this column.
po_hcl_conc
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
Data group: Phosphorus
Values
10.953084933058705
10.594212137996324
10.417759897353935
10.945852968861363
0.8275015282857971
* Nitschke, R. also contributed to this column.
tp_residual
Total residual P extracted with HNO3-Pressure-Extraction method
Unit: µg/g
Data group: Phosphorus
Values
10.340776759099061
11.031827582095646
11.046622336330891
10.231303186776277
10.089592416676386
* Nitschke, R. also contributed to this column.