%0 Journal Article
%T Soil resource availability impacts microbial response to organic carbon and inorganic nitrogen inputs
%A ZHANG Wei-jian
%A W ZHU
%A S HU
%A <br>ZHANG Wei-jian
%A W. ZHU
%A S. HU
%J 环境科学学报(英文版)
%D 2005
%I 
%X Impacts of newly added organic carbon(C) and inorganic nitrogen(N) on the microbial utilization of soil organic matter are important in determining the future C balance of terrestrial ecosystems. We examined microbial responses to cellulose and ammonium nitrate additions in three soils with very different C and N availability. These soils included an organic soil(14.2% total organic C, with extremely high extractable N and low labile C), a forest soil(4.7% total organic C, with high labile C and extremely low extractable N), and a grassland soil(1.6% total organic C, with low extractable N and labile C). While cellulose addition alone significantly enhanced microbial respiration and biomass C and N in the organic and grassland soils, it accelerated only the microbial respiration in the highly-N limited forest soil. These results indicated that when N was not limited, C addition enhanced soil respiration by stimulating both microbial growth and their metabolic activity. New C inputs lead to elevated C release in all three soils, and the magnitude of the enhancement was higher in the organic and grassland soils than the forest soil. The addition of cellulose plus N to the forest and grassland soils initially increased the microbial biomass and respiration rates, but decreased the rates as time progressed. Compared to cellulose addition alone, cellulose plus N additions increased the total C-released in the grassland soil, but not in the forest soil. The enhancement of total C-released induced by C and N addition was less than 50% of the added-C in the forest soil after 96 d of incubation, in contrast to 87.5% and 89.0% in the organic and grassland soils. These results indicate that indigenous soil C and N availability substantially impacts the allocation of organic C for microbial biomass growth and/or respiration, potentially regulating the turnover rates of the new organic C inputs.
%K cellulose
%K inorganic nitrogen
%K microbial biomass
%K microbial activity
%K carbon sequestration<br>土壤
%K 有机碳
%K 无机氮
%K 微生物
%K 纤维素
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=6CB1530875F53489BF1E81BD87B7F5E6&aid=F42181C4FBF0ACEED3E04C5E6441A73F&yid=2DD7160C83D0ACED&vid=BCA2697F357F2001&iid=94C357A881DFC066&sid=703F3C1B6594BA64&eid=2868AE484E7BAD6B&journal_id=1001-0742&journal_name=Journalofenvironmentalsciences(China)&referenced_num=0&reference_num=51