M art inez M eza E,W hit f ord W G S t emf low,t hroughf al l and channel izat ion of st emf low by root s in t h ree Chinhu ahu an desert shr ubs Journal of A rid Environ,1996,32:271～287
W hit f ord W G,A nders on J,R ice P M St em f low cont ribut ion t o t h e?f erti le island#eff ect in creosot ebus h,Larrea t riden tat a Journ al of A rid Environm ent s,1997,35:451～457
V i rginia R A,Jarrel l W M,W hit f ord W G Soil biot a and soil propert ies in t he surf ace root ing zone of mesquit e(P rosop i s gl and ul osa)in hi st orical and recent ly des ert if ied Chin huahuan D es ert hab itat s Biol ogy and Fert ilit y ofS oils,1992,14:90～95
[15]
S chl esing er W H,R aik es,H artl ey A E O n t he spatial pat t ern of soil nu t rient s in desert ecosyst em s Ecology,1996,77:364～374
[16]
Charley J L,W est N E Pl ant induced s oil chemical pat t erns in s om e s hrub dominat ed semi des ert ecosyst ems of Ut ah Journal of Ecology,1975,63:945～963
