6J.M. Craine,D.A. Wedin,F.S. Chapin,P.B. Reich.Relationship between the structure of root systems and resource use for 11 North American grassland plants[J]. Plant Ecology . 2003 (1)
7J. M. Craine,D. A. Wedin,F. S. Chapin III,P. B. Reich.The dependence of root system properties on root system biomass of 10 North American grassland species[J]. Plant and Soil . 2003 (1)
8Farrish K W.Spatial and temporal fine-root distribution in three Louisiana forest soil. Soil Science Society of America Journal . 1991
9Jackson R B,Mooney H A,Schulze E D.A global budget for fine root biomass,surface area and nutrient contents. Proceedings of the National Academy of Sciences of the United States of America . 1997