BEFmod: Herb layer biomass and nutrient status within the integrated BEFmod experiment - Site B

Usage Rights

This data is Private.

Dataset 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).

Dataset 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 B

Paper proposal submissions

Published

2016

Data columns available in the raw data part of this dataset

Samplenr
An individual number for each taken sample
Data group: Helper
Values
C32_F_2016
C32_C_2016
C32_I_2016
C32_C_2014
C32_C_2015
Treatment
treatment of each subplot: C-Controll; P-Phosphorus fertilization; NW-No weeding ; I-Insecticide addition; F- Fungicide addition
Data group: BEFmod subplots treatment
Keywords: treatment, BEFmod
Values
F
NW
C
I
P
Year
year of the record
Data group: Date
Values
2014
2016
2015
PTAG
PTAG
Data group: BEF research plot name
Values
p105330
p105310
p103320
p106210
p105340
Plot
Plot
Data group: Helper
Values
E31
C32
F21
E34
E33
Weight_f
biomass of ferns per subplot
Unit: g
Data group: Above and below ground biomass measurement
Keywords: biomass, ferns
Values
10.09
0.41
100.08
0
101.44
Weight_g
biomass of grass per subplot
Unit: g
Data group: Above and below ground biomass measurement
Keywords: biomass, grass
Values
0
0.47
0.12
0.21
0.45
Weight_h
biomass of herbs per subplot
Unit: g
Data group: Above and below ground biomass measurement
Keywords: biomass, herb
Values
0.12
0
0.24
0.31
0.18
Weight_w
biomass of woods per subplot (< 1m in height) per subplot
Unit: g
Data group: Above and below ground biomass measurement
Keywords: biomass, wood
Values
0
100.17
10.05
0.77
0.24
Weight_total
total biomass of the herb layer
Unit: g
Data group: Above and below ground biomass measurement
Keywords: herb layer, biomass
Values
101.15
100.33
100.37
100.05
102.19
Weight_amount_f
The proportion of ferns to the total biomass
Unit: percent
Data group: Above and below ground biomass measurement
Keywords: biomass, ferns
Values
0.16
0
0.25
0.17
0.73
Weight_amount_g
The proportion of grasses to the total biomass
Unit: percent
Data group: Above and below ground biomass measurement
Keywords: biomass, grasses
Values
0.14
0
0.2
0.05
0.19
Weight_amount_h
The proportion of herbs to the total biomass
Unit: percent
Data group: Above and below ground biomass measurement
Keywords: biomass, herb
Values
0.05
0
0.09
0.02
0.16
Weight_amount_w
The proportion of woods to the total biomass
Unit: percent
Data group: Above and below ground biomass measurement
Keywords: biomass, wood
Values
0.8
0.94
100
10.27
0
N
The proportion of nitrogen to each unit biomass
Unit: percent
Data group: Nitrogen
Keywords: nitrogen
Values
1.037
0.988
1.022
0.945
0.976
C
The proportion of carbon to each unit biomass
Unit: percent
Data group: Carbon
Keywords: carbon
Values
41.806
41.817
42.471
41.791
42.317
CN_ratio
carbon/nitrogen ratio
Data group: Carbon Nitrogen ratio
Values
22.15
20.294
21.656
20.397
21.941
P
mg phosphate in g leaf material
Unit: [mg/g]
Data group: Phosphorus
Keywords: phosphorus
Values
0.466214107
0.450034176
0.346953979
0.124190513
0.263678312
Northness
Northness of the subplot
Data group: Aspect
Values
0.00010514
0.000101959
-0.00011498
-0.000113435
0.000117653
Slope
inclination of each subplot
Data group: Inclination
Values
17.88
21.66
21.63
20.08
16.68
LAI
Leaf area index measured above the planted seedlings (1m height) in each subplot
Data group: Leaf Area Index (LAI)
Values
0.004004469
0.004036429
0.001953125
0
0.002358465