Relationship Between Microbial Biomass N Mineralization and Total Nitrogen Mineralization in Paddy Soils of Subtropical China
Year: 2008
Type: article
Abstract: The relationship between microbial biomass N and total N mineralization dynamics in paddy soils of subtropical China was investigated by lab incubation experiment.Results showed that the amount and rate of soil microbial biomass N mineralization decreased with the incubation time but increased with the promotion of soil fertility.During 12 weeks incubation,more than half of microbial biomass N was mineralized,in which half was occurred in the first 4 weeks.The cumulative N mineralization in paddy soils ranged from 73.0 to 127.8 mg/kg,and the rates ranged from 6.09 to 10.7 mg/(kg·wk).Two component equation and dynamic equation could simulate microbial biomass N and total N mineralization,respectively.Both the microbial biomass N and total N mineralization processes could be divided into two periods:rapid mineralization period in the first 8 weeks and thereafter slow mineralization period.The comparison between parameters in two equations showed that the proportion of microbial biomass N mineralization in soil total N mineralization varied from 10.8% to 49.5%.Microbial biomass N has a large mineralization potential and continuously-rapid turnover capacity.It plays an important role in maintaining soil nitrogen supply.
Source: Soils
Author: Lixiang Zhou
Language: English
Subfield: Soil Science
Domain: Life Sciences
SDGs: Zero hunger, Life on land
Open Access status: diamond
OpenAlex ID: W2382264980