Data from: Plant invasion increases soil microbial biomass carbon: Meta-analysis and empirical tests

Soil organic carbon (SOC) is a vital component of the global carbon cycle.
SOC influences soil fertility and structure and is controlled by various
factors, including land use, land management practices, and climate
change. Biological invasion is a significant yet controversial factor that
can alter SOC levels. We conducted a meta-analysis of 445 observations
from 61 published reports and followed up with field surveys to clarify
the impact of plant invasion on SOC. Our results indicated that plant
invasion leads to a 29% increase in microbial biomass carbon (MBC), which
is one of the key fractions of SOC. Specifically, among different
ecosystems, plant invasion caused MBC increases of 59% in estuaries, 59%
in alluvial land, 53% in wetlands, and 80% in orchards. Furthermore,
invasion by plants from the Asteraceae family resulted in a 33% increase
in MBC, whereas invasion by plants from the Lythraceae family caused a 72%
increase in MBC. Our field survey also revealed that plant invasion
elevated the soil MBC content relative to the occurrence of native plants
or bare ground. Overall, these findings suggest that plant invasion
impacts soil carbon, especially by increasing MBC, which may in turn
affect future invasions. These effects are influenced by the type of
invasive species, ecosystem type, and soil layer depth, highlighting the
complex role of biological invasion in the global carbon cycle.