Laboratory optical measurements to assess long-term changes in water-extractable soil organic matter, U.S. Great Plains

Carbon (C) and nitrogen (N) extracted from soil with water are associated with available plant nutrients and microbial activity, but information about how C and N...经水萃取自土壤的碳（C）与氮（N），与有效植物养分及微生物活性密切相关，但关于碳、氮如何……的相关信息