Practices and investigations of tree-tea intercropping systems in China

agroforesteria agroforesterie agroforestry agrosilvicultural systems arbre arbre forestier arbre fruitier calidad camellia sinensis chemical composition composition chimique crop yield cultivo intercalado cultivo mixto culture intercalaire feuille foliage forest trees fruit trees histoire historia history hojas intercropping interplanting leaves mixed cropping plantas de sombra plante d'ombrage quality recherche rendement des cultures rendimiento de cultivos research shade plants te tea trees