7ROBERTSM R. Response of the herbaceous layer to natural dis-turbance in North American forests[ J]. Canadian Journal of Bota- ny,2004,82(9) : 1273-1283.
8BADIANE N N Y, CHOTTE J L, PATE E, et al. Use of soil en- zyme activities to monitor soil quality in natural and improved fal- lows insemi-arid tropical regions[ J]. Applied Soil Ecology,2001, 18(3) :229-238.
9MARSCHNER P, SOLAIMAN Z, RENGEL Z. Rhizosphere proper- ties of poaceae genotypes under p-limiting conditions [ J ]. Plant and Soil, 2006,283 ( 1 ) : 11-24.
10ASAGI N, UENO H. Nitrogen dynamics in paddy soil applied with variousl5 N-labdlled green manures [ J ]. Plant and Soil, 2009,322 ( 1 ) : 251- 262.
