Stoichiometry of nitrogen and phosphorus and the content in grassland ecosystem in the upper reaches of Ili River
MA Jie, LI Lanhai, LIU Xiang, BAI Lei, GAO Liwei, ZHU Yongli
JOURNAL OF NANJING FORESTRY UNIVERSITY . 2017, (03): 7 -14 .  DOI: 10.3969/j.issn.1000-2006.201702013