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Title:
CSPs: N determination: soluble and extractable ammonium and nitrate (mineral nitrogen) in the CSPs (2008-2010)
Access rights:
Private
Usage rights:
No information available
Published:
No information available
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.
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
Measurement cirumstances:
No information available
Data analysis:
No information available

Filter:
Dataset column

Name:
Season
Definition:
Season
Unit:
No information available
Datagroup:
Season
Keywords:
date, season
Values:
Sum08
Aut08
Win10
Spr09
Contributors:
No information available

Dataset column

Name:
CSP
Definition:
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.
Unit:
No information available
Datagroup:
BEF research plot name
Keywords:
location
Values:
CSP02
CSP04
CSP05
CSP01
CSP03
Contributors:
No information available

Dataset column

Name:
Age_3
Definition:
Age_3; Datagroup description: Helper
Unit:
No information available
Datagroup:
Helper
Keywords:
No information available
Values:
2
3
1
Contributors:
No information available

Dataset column

Name:
Age_5HB
Definition:
Age_5HB; Datagroup description: Helper
Unit:
No information available
Datagroup:
Helper
Keywords:
No information available
Values:
3
5
1
2
4
Contributors:
No information available

Dataset column

Name:
Age_Y
Definition:
Age_Y; Datagroup description: Helper
Unit:
No information available
Datagroup:
Helper
Keywords:
No information available
Values:
106.200269215238
21.7205276618657
115.542037959348
105.769524835106
101.300551891237
Contributors:
No information available

Dataset column

Name:
Layer
Definition:
used soil increment; Datagroup description: Soil depth
Unit:
No information available
Datagroup:
Soil depth
Keywords:
soil depth
Values:
0-5cm
20-30cm
0-10cm
0-50cm
10-20cm
Contributors:
No information available

Dataset column

Name:
Layer_cm
Definition:
mean of soil increment; Datagroup description: Soil depth
Unit:
cm
Datagroup:
Soil depth
Keywords:
soil depth
Values:
15
25
2.5
45
35
Contributors:
No information available

Dataset column

Name:
NO3
Definition:
Nitrate concentration
Unit:
mg/kg
Datagroup:
Nitrate
Keywords:
nitrogen, nitrate
Values:
0.007826158806705624
0.006043188459628479
0
0.005043227665706057
0.006613756613756622
Contributors:
No information available

Dataset column

Name:
NH4
Definition:
Ammonium concentration
Unit:
mg/kg
Datagroup:
Ammonium
Keywords:
nitrogen, ammonium
Values:
0.014564765656468729
0.011872486310735576
0
0.03885953920277783
0.03504435968339092
Contributors:
No information available

Dataset column

Name:
Nmin
Definition:
Mineral Nitrogen concentration (NO3+NH4); Datagroup description: Nitrogen
Unit:
mg/kg
Datagroup:
Nitrogen
Keywords:
nitrogen
Values:
0.028831191900736294
0.011872486310735576
0
0.028758531601624598
0.028057545366858574
Contributors:
No information available

Dataset column

Name:
R.NO3
Definition:
Nitrification rate
Unit:
mg/kg*d
Datagroup:
Nitrification rate
Keywords:
nitrification
Values:
-0.0009421534251516303
-0.0009329595517011669
0.0006702412868632713
0.0009057971014492763
0
Contributors:
No information available

Dataset column

Name:
R.NH4
Definition:
Ammonification rate
Unit:
mg/kg*d
Datagroup:
Ammonification rate
Keywords:
ammonification
Values:
0
-0.010026905111971365
-0.007928507596067924
0.0007240103879751381
0.0006585026468502934
Contributors:
No information available

Dataset column

Name:
R.Nmin
Definition:
Mineralisation rate (R.NO3 + R.NH4)
Unit:
mg/kg*d
Datagroup:
Mineralisation rate
Keywords:
mineralisation
Values:
0.00665764616657466
-0.0068001813784179035
0.0006585026468502934
0
-0.006588025022341381
Contributors:
No information available

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5 scherer lorenzen medium

Michael
Scherer-Lorenzen

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Stefan
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