Home / Standards / LY/T 1237-1999 LY/T 1237-1999 Active 森林土壤有机质的测定及碳氮比的计算 Standard Type LY ICS N/A CCS N/A Status Active Issue Date 1999-07-15 Implementation 1999-11-01 Centralized Committee 国家林业局 Issuing Authority 国家林业局