Arbuscular mycorrhizal(AM) fungi are soil inhabitants in a variety of ecosystems including agroecosystems,forest ecosystems,desert ecosystems,sea island ecosystems etc.They form mutual symbiosis with plant roots and play an important role in increasing sustainable agricultural production and keeping ecological balance.Among the ecosystems,agroecosystems have many forms,and are very large and complicated.They include many subecosystems,such as wheat field ecosystems,rice field ecosystems,orchard ecosystems,g...