万素梅, 贾志宽, 王勇, 韩清芳 . 黄土高原半湿润区苜蓿草地土壤干层形成及氮素消耗研究[J]. 自然资源学报, 2008 , 23(3) : 383 -390 . DOI: 10.11849/zrzyxb.2008.03.004

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