The conflict between hosts and non-hosts changes the severity of diseases in degraded grassland plant communities

load: disease severity of plant community

richnes: species richness

Nonhost: Non-hosts richness

coverage: relative coverage

RHost: relative hosts richness

PD: Faith's phylogenetic distance

beta: beta diversity of plant community

SLA: CWM SLA

LN: CWM leaf N content

LP:CWM leaf P content

NP: CWM leaf N:P

group: degree of grassland degradation

Shannon: Shannon index of plant community

Simpson: Simpsion index of plant community

Pielou: Pielou index of plant community

marglef: Marglef index of plant community