Changes in aggregate-associated organic carbon and nitrogen after 27 years of fertilization in a dryland alfalfa grassland on the Loess Plateau of China
ZHANG Liqiong, WEI Xiaorong, HAO Mingde, ZHANG Meng
Journal of Arid Land . 2015, (4): 429 -437 .  DOI: 10.1007/s40333-015-0003-6