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Effects of Anthropogenic Energy Input on Net Primary Productivity of Farmland Ecosystems——A Case Study of Southwest Shandong Province
周美华 苏本营 许宏 苏华 姜东 李永庚
Chinese Agricultural Science Bulletin . 2013, (26): 124 -131 .  DOI: 10.11924/j.issn.1000-6850.2012-1994