The influence of nutrient management regimes was most evident on SOC, DOC, DON, soil microbial and biochemical properties. The levels of SOC and DOC were significantly greater in ONM and INM compared to CNM and control. Conversely, DON level was markedly higher under CNM compared to ONM and INM. CNM also positively influenced NMIC but decreased CMIC, PMIC and SR levels. NMIN followed an identical trend as microbial biomass and SR; being greatest in INM and ONM. Likewise, the DOC:DON, CMIC:SOC (QMIC) and CMIC:NMIC ratios were greatest in ONM and least in CNM. Contrarily, higher qCO2 in CNM and control suggested microbial communities which are energetically less efficient with high maintenance C requirement. Results on enzyme activities revealed that not all the treatments affected the enzyme activities to the same degree. The activities of DH, Ac-P and 尾G were in the order ONM > INM > CNM, while the activities of UR and AS were in the order CNM > INM > ONM. The strong effects of nutrient management regimes implied that soil biochemical/microbial parameters are sensitive enough to detect changes in soil quality even in the short-term.
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