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요약정보
熏蒸浸提法测定碱性土微生物生物量碳初探 / Preliminary Study of Fumigation Extraction in Microbial Biomass Carbon of Alkali Soil
Resource Type
Academic Journal
Authors
刘雨晴
;
朱小琴
;
胡会峰
;
张金波
;
LIU Yuqing
;
ZHU Xiaoqin
;
HU Huifeng
;
ZHANG Jinbo
Source
土壤 / Soils
. 50(3):640-644
Subject
氯仿熏蒸
熏蒸时间
碱性土
有机质
微生物生物量碳
Language
Chinese
ISSN
0253-9829
Online Access
Find it @ DONGA
초록
为探究熏蒸浸提法测定碱性土壤微生物生物量碳(microbial biomass carbon,MBC)的最优熏蒸时间和浸提液浓度,本研究采用9种熏蒸时间、2种K2SO4浸提液浓度对不同有机质含量的碱性土壤MBC进行了测定.结果表明:①对于碱性土壤,熏蒸时间的选择与土壤有机质含量有关,土壤有机质含量越高,MBC提取值达到稳定的熏蒸时间越长.建议测定高有机质土壤(≥60 g/kg)MBC时熏蒸时间不少于24 h;测定中、低有机质土壤(≤30g/kg)MBC时熏蒸时间不少于18 h.②土壤有机质含量影响K2SO4浸提液的提取效率,测定高、中有机质土壤MBC时需要0.5 mol/L K2SO4浸提液进行提取;在低有机质土壤MBC测定中,0.25 mol/L K2SO4浸提液即可.③对于未知有机质含量的碱性土壤建议氯仿熏蒸时间至少为24 h,K2SO4浸提液浓度为0.5 mol/L.
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