Ecology 2 Indicator indicator Animals 1 Aquaculture 1 Biological trait analyse 1 Biological trait analysis 1 Biological traits 1 Bivalve aquaculture 1 Bivalvia 1 China 1 Culture methods 1 Degraded grassland 1 Degraded grasslands 1 Diversity index 1 Diversity indices 1 Ecological impacts 1 Environmental quality assessment 1 Eumonhystera 1 Functional diversity 1 Grassland degradation 1 Linear mixed models 1 Macrofauna 1 Macrofaunal assemblage 1 Macrofaunal assemblages 1 Molluscs 1 Nematoda 1 Nematode communities 1 North China 1 Prismatolaimus 1 Soil fauna 1