Restoration plantings commonly fail to re-establish native mycorrhizal networks because the soil and plant conditions required for those fungal symbionts are rarely restored alongside aboveground vegetation. Research by Peter van der Heijden at ETH Zurich highlights that mycorrhizal diversity underpins plant productivity, while work by Ian A. Dickie at the University of Auckland emphasizes that inoculum limitation—the absence of viable fungal propagules—is a frequent bottleneck in degraded sites. When restoration ignores belowground partners, plant roots remain disconnected from the fungal web that supplies nutrients, water, and disease buffering.
Causes rooted in soil practice and plant sourcing
Common restoration practices unintentionally sever fungal continuity. Heavy soil disturbance, removal of surface litter, and compaction destroy hyphal networks and reduce spore survival, producing severe declines in soil inoculum. Nursery-grown transplants often lack local mutualists because commercial potting mixes and fungicide treatments suppress or eliminate native fungi; USDA Forest Service guidance documents note that standard nursery and container practices can reduce beneficial fungal colonization. Using non-local or single-species plantings further deprives fungi of compatible hosts, and persistent fertilizer application can shift plant dependence away from mycorrhizae. These drivers act together to create context-dependent mismatches between restored vegetation and the fungal community required to sustain it.
Consequences for ecosystems and communities
The consequences extend beyond individual plant mortality. Without functioning mycorrhizal networks, restored plants show reduced nutrient uptake, poorer drought resilience, and slower growth, which in turn hampers succession and soil carbon accumulation. Disconnected fungal networks can favor opportunistic or non-native fungi, altering soil food webs and long-term ecosystem trajectories. There are also social and cultural dimensions: nursery supply chains and land management decisions determine which species and soils are moved across landscapes, shaping outcomes for regional biodiversity and for Indigenous and local communities whose cultural practices rely on particular plant–fungal relationships. Restoration that overlooks these relationships often requires repeated interventions, increasing costs and eroding public confidence in ecological projects.
Re-establishing native mycorrhizal networks demands deliberate actions: protecting remnant soils, using local inoculum or restorative substrates, diversifying host species, and aligning management with traditional ecological knowledge that recognizes belowground connections. Only by treating soil fungi as active partners can plantings recover the resilience and function of native ecosystems.