1 Stover D B, Day F P, Butnor J R, et al. Effect of elevated CO2 on coarse-root biomass in Florida scrub detected by ground-penetrating radar. Ecology, 2007, 88: 1328-1334
[2]
2 Resh S C, Battaglia M, Worledge D, et al. Coarse root biomass for eucalypt plantations in Tasmania, Australia: sources of variation and methods for assessment. Trees-Struct Funct, 2003, 17: 389-399
[3]
3 Day F P, Weber E P, Hinkle C, et al. Effects of elevated atmospheric CO2 on fine root length and distribution in an oak-palmetto scrub ecosystem in central Florida. Global Change Biol, 1996, 2: 143-148
[4]
4 Misra R, Turnbull C, Cromer R, et al. Below- and above-ground growth of Eucalyptus nitens in a young plantation: I Biomass. Forest Ecol Manag, 1998, 106: 283-293
[5]
5 Gale M R, Grigal D F, Harding R B. Soil productivity index: predictions of site quality for white spruce plantations. Soil Sci Soc Am J, 1991, 55: 1701-1708
15 Bi H, Turvey N D, Heinrich P. Rooting density and tree size of Pinus radiata (D. Don) in response to competition from Eucalyptus obliqua (L''Herit). Forest Ecol Manag, 1992, 49: 31-42
[9]
16 Wielopolski L, Hendrey G, Daniels J, et al. Imaging Tree Root Systems In Situ. In: Proc Eighth Int Conf on Ground Penetrating Radar. Noon D A, Stickley G F, Longstaff D, eds. Washington, DC, 2000, 4084: 642-646
[10]
17 Daniels D J. Ground Penetrating Radar. Encyclopedia of RF and Microwave Engineering, 2005, doi: 10.1002/0471654507.eme152
[11]
18 Hruska J, ？ermák J, ？ustek S. Mapping tree root systems with ground-penetrating radar. Tree Physiol, 1999, 19: 125-130
[12]
19 Butnor J R, Doolittle J, Kress L, et al. Use of ground-penetrating radar to study tree roots in the southeastern United States. Tree Physiol, 2001, 21: 1269-1278
21 Molino J F, Sabatier D. Tree diversity in tropical rain forests: a validation of the intermediate disturbance hypothesis. Science, 2001, 294: 1702-1704
[15]
22 R Development Core Team R: A Language and Environment for Statistical Computing. R Foundation for Statistical Computing, Vienna, Austria. 2009, http: //www.R-project.org, accessed 2010-09
24 Tufekcioglu A, Raich J, Isenhart T, et al. Fine root dynamics, coarse root biomass, root distribution and soil respiration in a multispecies riparian buffer in Central Iowa, USA. Agroforest Syst, 1998, 44: 163-174
26 Majdi H, Persson H. Spatial distribution of fine roots, rhizosphere and bulk soil chemistry in an acidified Picea abies stand. Scand J Forest Res, 1993, 8: 147-155
[20]
27 Büttner V, Leuschner C. Spatial and temporal patterns of fine root abundance in a mixed oak-beech forest. Forest Ecol Manag, 1994, 70: 11-21
[21]
28 Brisson J, Reynolds J F. The effect of neighbors on root distribution in a creosotebush (Larrea tridentata) population. Ecology, 1994, 75: 1693-1702
[22]
29 Casper B B, Jackson R B. Plant competition underground. Annu Rev Eco Syst, 1997, 28: 545-570
[23]
30 Stegen J C, Hurlbert A H. Inferring ecological processes from taxonomic, phylogenetic and functional trait β-diversity. PLoS ONE, 2011, 6: e20906
14 Xie Y, An S, Wu B, et al. Density-dependent root morphology and root distribution in the submerged plant Vallisneria natans. Environ Exp Bot, 2006, 57: 195-200
[30]
10 Archer E, Strauss H. Effect of plant density on root distribution of three-year-old grafted 99 Richter grapevines. S Afr J Enol Vitic, 1985, 6: 25-30
