Data for Fichtner et. al. 2020 "Neighbourhood diversity mitigates drought impacts on tree growth" J. Ecol.

Usage Rights

This data is Free for public.

Dataset Abstract

1. Biodiversity is considered to mitigate detrimental impacts of climate change on the functioning of forest ecosystems, such as drought-induced decline in forest productivity. However, previous studies produced controversial results and experimental evidence is rare. Specifically, the biological mechanisms underlying mitigation effects remain unclear, as existing work focuses on biodiversity effects related to the community scale.
2. By using trait-based neighbourhood models, we quantified changes in aboveground wood productivity of 3397 trees that were planted in a large-scale tree diversity experiment in subtropical China across gradients of neighbourhood diversity and climatic conditions over a six-year period. This approach allowed us to simultaneously assess to what extent functional traits of a focal tree and biodiversity at the local neighbourhood scale mediate the growth response of individual trees to drought events.
3. We found that neighbourhood tree species richness can mitigate for drought-induced growth decline of young trees. Overall, positive net biodiversity effects were strongest during drought and increased with increasing taxonomic diversity of neighbours. In particular, drought-sensitive species (i.e. those with a low cavitation resistance) benefitted the most from growing in diverse neighbourhoods, suggesting that soil water partitioning among local neighbours during drought particularly facilitated most vulnerable individuals. Thus, diverse neighbourhoods may enhance ecosystem resistance to drought by locally supporting drought-sensitive species in the community.
4. Synthesis. Our findings demonstrate that mechanisms operating at the local neighbourhood scale are a key component for regulating forests responses to drought and improve insights into how local species interactions vary along stress gradients in highly diverse tree communities.

Temporal Extent

2010-2016

Taxonomic Extent

Trees

Data columns available in the raw data part of this dataset

TAG
code for planting locations, 12 digits with "t" in front
Data group: t or s TAG Main Experiment
Values
t102340010509
t102340010514
t102340010511
t102340010506
t102340010510
PTAG
Plot ID across CSP, MainA and MainB
Unit: id
Data group: PTAG
Values
p103310
p102340
p102381
p102350
p102361
ALTITUDE
elevation (from interpolated raster); Datagroup description: Elevation above sea level. Altitude.
Unit: m
Data group: Elevation
Values
113.05
112.87
112.7
111.89
112.58
SLOPE
slope (from interpolated raster); Datagroup description: Inclination "is the angular distance of the orbital plane from the plane of reference (usually the primary's equator or the ecliptic), normally stated in degrees" (Wikipedia). Also referred to as 'slope'.
Unit: degree
Data group: Inclination
Values
10.15
10.01
10.26
10.23
10.22
SpeciesCode
focal tree species identity
Data group: Species codes (Species numbers in the Main experiment)
Values
13
1
10
11
12
PSI50
water potential at which 50% of xylem hydraulic conductivity is lost, data provided in Kröber, Zhang, Ehmig, & Bruelheide (2014), PLoS ONE, 9, e109211
Unit: MPa
Data group: trait
Values
-2.423270307
-1.853967951
-1.281014328
-1.672887281
-2.697233227
SAWP
standardised annual aboveground wood productivity; aboveground wood productivity (AWP) of a given focal tree in a specific census interval devided by the average AWP (using the 50% quantile of AWP) of the respective census
Unit: dimensionless
Data group: Above and below ground biomass measurement
Values
0.0027315558619206747
0.004170959214110317
0.002106128592218533
0.0039631136422347306
0.0030104659074083905
NCI
neighbourhood competition index; the focal trees’ basal area relative to the total basal area of closest neighbours
Unit: cm2 cm-2
Data group: Neighbourhood diverstiy
Values
0.0002561475447595801
0.0006476684241187709
0.00028478309137369045
0.0004498425761300037
0.0006998988074331117
nb_count
total number of living neighbours
Unit: count
Data group: Abundance
Values
3
5
4
1
2
nb_richness
neigbourhood tree spcies richness; the total number of closest heterospecific neighbour species
Unit: count
Data group: Neighbourhood diverstiy
Values
1
3
0
2
4
nb_mix
neighbourhood species composition
Data group: Neighbourhood diverstiy
Values
11
10_11_22
1
10_15
10_14_18
SPEI_12_Oct
standardised precipitation-evapotranspiration index calculated for a 12 month timescale, see Fichtner et al. 2020 (Journal of Ecology) for calculation
Unit: dimensionless
Data group: Precipitation
Values
1.44876
0.67536
-1.51947
1.38172
-0.29015
Initial_year
initial year of census
Unit: nominal Year
Data group: Date
Values
2014
2011
2010
2013
2012