%0 Journal Article
%T Relationship between microbial biomass N mineralization and total nitrogen mineralization in paddy soils of subtropical China<br>红壤水稻土微生物生物量氮与总氮矿化的关系
%A CHEN Yang
%A LI Zhong-pei
%A CHE Yu-ping
%A ZHOU Li-xiang
%A <br>陈旸
%A 李忠佩
%A 车玉萍
%A 周立祥
%J 土壤
%D 2008
%I 
%X 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.
%K Paddy soils of subtropical China
%K Microbial biomass N
%K Total N
%K Mineralization
%K Relationship<br>红壤水稻土
%K 微生物生物量氮
%K 总氮
%K 矿化
%K 关系
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=03F54A49DE00578AA0E5DDF5BC021AA7&cid=1A8B5357F0EF07B8&jid=56F69E970C6E5190CDB409D28DD0E3C6&aid=BE8D6B0EDF40A5702B4A75860FC8CD40&yid=67289AFF6305E306&vid=1371F55DA51B6E64&iid=94C357A881DFC066&sid=4D0B71A09FA5A2A5&eid=94655B9881133A28&journal_id=0253-9829&journal_name=土壤&referenced_num=1&reference_num=26