Institute;
of;
Ecology,;
South;
China;
Botanical;
Garden,;
Chinese;
Academy;
of;
Sciences,;
Guangzhou;
510650,;
China;
Department;
of;
Nematology,;
University;
of;
California,;
Davis,;
CA;
95616,;
USA;
Department;
of;
Nematology,;
University;
of;
California,;
Davis,;
CA;
95616,;
USA;
elevated; CO2,; legume; species,; microbial; biomass,; shoot-to-root; ratio.;