Holsinger K E,Gottlieb L D.Conservation of rare and endangered plants:principles and prospects〔C〕//Falk D A,Holsinger K E.Genetics and Conservation of Rare Plants.Oxford:Oxford University Press,1991:198-208.
[2]
Schemske D W,Husband B C,Ruckelshaus M H,et al.Evaluating approaches to the conservation of rare and endangered plants.Ecology,1994,75(3):584-606.
Fransen B,de Kroon H,Berendse F.Root morphological plasticity and nutrient acquisition of perennial grass species from habitats of different nutrient availability.Oecologia,1998,115(3):351-358.
Xu H,Li Y.Wateruse strategy of three central Asian desert shrubs and their responses to rain pulse events.Plant and Soil,2006,285(1):5-17.
[27]
Phillips F M.Environmental tracers for water movement in desert soils of the American Southwest.Soil Science Society of America Journal,1994,58(1):15-24.
[28]
Richard J H,Caldwell M M.Hydraulic lift:Substantial nocturnal water transport between soil layers by Artemisia tridentate roots.Oecologia,1987,73:486-489.
[29]
Dexter A R.Soil physical quality Part I.Theory,effects of soil texture,density,and organic matter,and effects on root growth.Geoderma,2004,120(3/4):201-214.
Smit A,Bengough A G,Engels C,et al.Root Methods:A Handbook.Berlin:SpringerVerlag,2000:1-32.
[32]
Hendrick R L,Pregitzer K S.The dynamics of fine root length,biomass,and nitrogen content in two northern hardwood ecosystems.Canadian Journal of Forest Research,1993,23(12):2 507-2 520.
[33]
Wilcox C S,Ferguson J W,Fernandez G C J,et al.Fine root growth dynamics of four Mojave Desert shrubs as related to soil moisture and microsite. Journal of Arid Environments,2004,56(1):129-148.
Abrahams A D,Parsons A J.Relation between infiltration and stone cover on a semiarid hillslope,southern Arizona.Journal of Hydrology,1991,122(1):49-59.
[41]
Cerdà A.Effects of rock fragment cover on soil infiltration,interrill runoff and erosion.European Journal of Soil Science,2001,52(1):59-68.