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Title:
BEFmod: Herb layer biomass and nutrient status within the integrated BEFmod experiment - Site A
Access rights:
Private
Usage rights:
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Published:
No information available
Abstract:
In forests, the herbaceous understory vegetation plays an important role for ecosystem functioning as it represents a significant component of total aboveground productivity. In addition, the herb layer contributes to overall forest species richness and controls tree species regeneration. Vice versa, trees in the overstory control understory herb and shrub growth through competition for resources. Using an experimental forest plantation with manipulated tree richness we asked to which degree tree species richness affect biomass and nutrient status in the herb layer and how these relationships across strata change with abiotic environmental conditions and competition intensity. In the context of the Biodiversity-Ecosystem Functioning project in subtropical China (BEF-China), we made use of the integrated BEFmod experiment arranged along a tree species richness gradient at two sites, with additional subplot treatments of phosphorus addition, insecticides addition, fungicide addition, herb layer weeding and no weeding. In 2014 and 2015, we determined herb layer biomass production and C,N,P status on a total of 105 subplots (C-, NW- and P - treatment). In 2016, we determined herb layer biomass production on a total of 175 subplots (C-, NW-, F-, I- and P - treatment).
Design:
In all plots in BEF-China (including C, P, F and I treatment) the herb layer has been continuously weeded twice a year, (since 2009 and 2010, for site A and site B, respectively) and since 2014 once a year on both sites to increase the establishment of planted trees. In each VIP, subplots were subjected to a manipulation of resource supply and biotic interactions (BEFmod experiment), which started in 2014. On the northern edge of each VIP, 5 subplots were established, each measuring 5.16 x 5.16 m and containing 4 × 4 trees. Subplots were randomly assigned to five different treatments: “No weeding“ (NW, i.e., admitting all types of weeds, already established in 2011), “Phosphorus fertilization” (P, i.e., applying 40 g triple super phosphate (H2PO4)2 per tree, corresponding to 100 kg P/ha once in April 2014), and “Control” (C, i.e., weeding as on the total plot level together with monthly H2O application). The BEFmod comprises two further treatments (F, i.e. Fungicide application, and I, i.e. Insecticide application), which we do not refer in our study. Nevertheless, in 2016 biomass data was also collected for the I- and F treatment. In each subplot, aboveground herb layer biomass was sampled from three patches, each 0.5 m × 0.5 m in size, located at randomly selected positions between planted trees and used as a proxy of herb layer productivity. The three biomass samples were pooled by subplot and sorted by life forms of woody species, ferns, grasses and herbs. Each sample was oven dried for 48 h at 70°C. In addition, nutrient stocks (C, N, P) were deduced from leaf samples of Miscanthus floridulus (as a phytometer available in all plots) taken in 2014 and 2015.
Spatial extent:
VIP Plots of the main experiment on Site A
Temporal extent:
No information available
Taxonomic extent:
No information available
Measurement cirumstances:
No information available
Data analysis:
No information available

Filter:
Dataset column

Name:
Samplenr
Definition:
An individual number for each taken sample
Unit:
No information available
Datagroup:
Helper
Keywords:
No information available
Values:
C32_C_2016
C32_F_2016
C32_C_2014
C32_C_2015
C32_I_2016
Contributors:
No information available

Dataset column

Name:
Treatment
Definition:
treatment of each subplot: C-Controll; P-Phosphorus fertilization; NW-No weeding ; I-Insecticide addition; F- Fungicide addition
Unit:
No information available
Datagroup:
BEFmod subplots treatment
Keywords:
treatment, BEFmod
Values:
I
P
C
NW
F
Contributors:
No information available

Dataset column

Name:
Year
Definition:
year of the record
Unit:
No information available
Datagroup:
Date
Keywords:
No information available
Values:
2014
2015
2016
Contributors:
No information available

Dataset column

Name:
PTAG
Definition:
PTAG
Unit:
No information available
Datagroup:
BEF research plot name
Keywords:
No information available
Values:
p105330
p105310
p103320
p105340
p106210
Contributors:
No information available

Dataset column

Name:
Plot
Definition:
Plot
Unit:
No information available
Datagroup:
Helper
Keywords:
No information available
Values:
C32
E31
F21
E34
E33
Contributors:
No information available

Dataset column

Name:
Weight_f
Definition:
biomass of ferns per subplot
Unit:
g
Datagroup:
Above and below ground biomass measurement
Keywords:
ferns, biomass
Values:
10.09
101.44
100.08
0.41
0
Contributors:
No information available

Dataset column

Name:
Weight_g
Definition:
biomass of grass per subplot
Unit:
g
Datagroup:
Above and below ground biomass measurement
Keywords:
grass, biomass
Values:
0.47
0.12
0.21
0
0.45
Contributors:
No information available

Dataset column

Name:
Weight_h
Definition:
biomass of herbs per subplot
Unit:
g
Datagroup:
Above and below ground biomass measurement
Keywords:
herb, biomass
Values:
0.12
0.31
0.24
0.18
0
Contributors:
No information available

Dataset column

Name:
Weight_w
Definition:
biomass of woods per subplot (< 1m in height) per subplot
Unit:
g
Datagroup:
Above and below ground biomass measurement
Keywords:
wood, biomass
Values:
0
0.24
10.05
100.17
0.77
Contributors:
No information available

Dataset column

Name:
Weight_total
Definition:
total biomass of the herb layer
Unit:
g
Datagroup:
Above and below ground biomass measurement
Keywords:
herb layer, biomass
Values:
100.33
100.05
101.15
102.19
100.37
Contributors:
No information available

Dataset column

Name:
Weight_amount_f
Definition:
The proportion of ferns to the total biomass
Unit:
percent
Datagroup:
Above and below ground biomass measurement
Keywords:
ferns, biomass
Values:
0.16
0.17
0.25
0.73
0
Contributors:
No information available

Dataset column

Name:
Weight_amount_g
Definition:
The proportion of grasses to the total biomass
Unit:
percent
Datagroup:
Above and below ground biomass measurement
Keywords:
grasses, biomass
Values:
0
0.2
0.19
0.05
0.14
Contributors:
No information available

Dataset column

Name:
Weight_amount_h
Definition:
The proportion of herbs to the total biomass
Unit:
percent
Datagroup:
Above and below ground biomass measurement
Keywords:
biomass, herb
Values:
0.16
0.09
0.02
0.05
0
Contributors:
No information available

Dataset column

Name:
Weight_amount_w
Definition:
The proportion of woods to the total biomass
Unit:
percent
Datagroup:
Above and below ground biomass measurement
Keywords:
biomass, wood
Values:
100
0.94
0
10.27
0.8
Contributors:
No information available

Dataset column

Name:
N
Definition:
The proportion of nitrogen to each unit biomass
Unit:
percent
Datagroup:
Nitrogen
Keywords:
nitrogen
Values:
1.022
0.988
0.945
0.976
1.037
Contributors:
No information available

Dataset column

Name:
C
Definition:
The proportion of carbon to each unit biomass
Unit:
percent
Datagroup:
Carbon
Keywords:
carbon
Values:
41.791
41.817
42.317
41.806
42.471
Contributors:
No information available

Dataset column

Name:
CN_ratio
Definition:
carbon/nitrogen ratio
Unit:
No information available
Datagroup:
Carbon Nitrogen ratio
Keywords:
No information available
Values:
22.15
21.656
21.941
20.294
20.397
Contributors:
No information available

Dataset column

Name:
P
Definition:
mg phosphate in g leaf material
Unit:
[mg/g]
Datagroup:
Phosphorus
Keywords:
phosphorus
Values:
0.466214107
0.263678312
0.450034176
0.346953979
0.124190513
Contributors:
No information available

Dataset column

Name:
Northness
Definition:
Northness of the subplot
Unit:
No information available
Datagroup:
Aspect
Keywords:
No information available
Values:
-0.000113435
-0.00011498
0.000101959
0.00010514
0.000117653
Contributors:
No information available

Dataset column

Name:
Slope
Definition:
inclination of each subplot
Unit:
No information available
Datagroup:
Inclination
Keywords:
No information available
Values:
16.68
21.63
21.66
20.08
17.88
Contributors:
No information available

Dataset column

Name:
LAI
Definition:
Leaf area index measured above the planted seedlings (1m height) in each subplot
Unit:
No information available
Datagroup:
Leaf Area Index (LAI)
Keywords:
No information available
Values:
0.004036429
0.004004469
0.002358465
0
0.001953125
Contributors:
No information available

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140 germany medium

Markus
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Alexandra
Erfmeier

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