CSPs: N determination: soluble and extractable ammonium and nitrate (mineral nitrogen) in the CSPs (2008-2010)

Usage Rights

This data is Private.

Dataset Abstract

The concentration of plant available soil nitrogen (nitrate and ammonium) was measured in the CSPs to quantify and qualify changes in the course of secondary forest succession. Soil mineral N was determined in five to six soil layers in four season: at peak growth in summer, at the time of leaf shedding in autumn, during the peak of the dry season in winter and at the time of bud burst in spring by standard soil analysis protocols (extraction with 1M KCl solution). Ammonium and nitrate concentrations were measured with a Flow Injection Analyzer (FIA) and results are presented as plant available ammonium and nitrate on a dry weight basis.

Dataset Design

Soil samples were collected in 10 cm depth-increments in the mineral soil (A- and B-horizon) up to a depth of 50 cm. Samples per depth were pooled from 4 cores taken in the four corners of the central plot. 5 g of field moist soil per sample were extracted the same day with 50 ml of 1M KCl solution. Ammonium and nitrate concentrations were measured with a Flow Injection Analyzer (FIA) and results are presented as plant available NH4+ and NO3- on a dry weight basis. To determine net N mineralization plastic tubes were driven into the soil next to the first sampling location in each of the four corners of the central plot. Tubes were closed with a lid and remained in the soil for an incubation period of 14 days. Aeration is possible through two holes in the upper part of the tube. Plant uptake is avoided and the samples remained subject to natural diurnal temperature fluxes. After the incubation period the soil core was analyzed as described before. In the summer 08 campaign incubated soil from the four corners of the central plot were analyzed separately. Whereas in the autumn 08 campaign the incubated soil was pooled from the samples taken in the four corners of the central plot to receive one sample per soil depth (0-5, 5-10cm). The extractable amount of nitrate and ammonium minus the preincubation quantities provides an estimate of net ammonification and net nitrification. ---- Mineral nitrogen was determined in the following soil layers:
Summer 08: : 0-10, 10-20, 20-30, 30-40, 40-50 cm; incubated soil core: 0-10 cm Autumn 08, Spring 09, Winter 10: 0-5, 5-10, 10-20, 20-30, 30-40, 40-50cm, incubated soil core: 0-5, 5-10 cm

Spatial Extent

CSPs, Gutianshan National Nature Reserve
29°08'-29°17'N
118°02'-118°11'E

Temporal Extent

2008-2010

Taxonomic Extent

No organism sampled, soil samples

Data columns available in the raw data part of this dataset

Season
Season
Data group: Season
Keywords: date, season
Values
Spr09
Sum08
Win10
Aut08
CSP
BEF research plot name; 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
Keywords: location
Values
CSP04
CSP05
CSP03
CSP02
CSP01
Age_3
Age_3; Datagroup description: Helper
Data group: Helper
Values
3
1
2
Age_5HB
Age_5HB; Datagroup description: Helper
Data group: Helper
Values
5
2
4
3
1
Age_Y
Age_Y; Datagroup description: Helper
Data group: Helper
Values
101.300551891237
105.769524835106
115.542037959348
106.200269215238
21.7205276618657
Layer
used soil increment; Datagroup description: Soil depth
Data group: Soil depth
Keywords: soil depth
Values
10-20cm
0-50cm
20-30cm
0-5cm
0-10cm
Layer_cm
mean of soil increment; Datagroup description: Soil depth
Unit: cm
Data group: Soil depth
Keywords: soil depth
Values
15
35
45
25
2.5
NO3
Nitrate concentration
Unit: mg/kg
Data group: Nitrate
Keywords: nitrogen, nitrate
Values
0.006043188459628479
0.007826158806705624
0
0.006613756613756622
0.005043227665706057
NH4
Ammonium concentration
Unit: mg/kg
Data group: Ammonium
Keywords: nitrogen, ammonium
Values
0
0.03504435968339092
0.03885953920277783
0.011872486310735576
0.014564765656468729
Nmin
Mineral Nitrogen concentration (NO3+NH4); Datagroup description: Nitrogen
Unit: mg/kg
Data group: Nitrogen
Keywords: nitrogen
Values
0.011872486310735576
0.028758531601624598
0
0.028831191900736294
0.028057545366858574
R.NO3
Nitrification rate
Unit: mg/kg*d
Data group: Nitrification rate
Keywords: nitrification
Values
0.0006702412868632713
-0.0009421534251516303
0.0009057971014492763
0
-0.0009329595517011669
R.NH4
Ammonification rate
Unit: mg/kg*d
Data group: Ammonification rate
Keywords: ammonification
Values
-0.010026905111971365
-0.007928507596067924
0
0.0006585026468502934
0.0007240103879751381
R.Nmin
Mineralisation rate (R.NO3 + R.NH4)
Unit: mg/kg*d
Data group: Mineralisation rate
Keywords: mineralisation
Values
-0.0068001813784179035
0
0.0006585026468502934
-0.006588025022341381
0.00665764616657466