Arid
DOI10.1016/j.soilbio.2012.11.024
Soil type and moisture regime control microbial C and N mineralization in grassland soils more than atmospheric CO2-induced changes in litter quality
Jin, Virginia L.1; Haney, Richard L.2; Fay, Philip A.2; Polley, H. Wayne2
通讯作者Jin, Virginia L.
来源期刊SOIL BIOLOGY & BIOCHEMISTRY
ISSN0038-0717
出版年2013
卷号58页码:172-180
英文摘要

Global change-induced alterations in litter quality and soil moisture regime will likely impact grassland C and N dynamics, but how these changes interact with edaphic properties across the landscape is unclear. We measured the effects of litter quality, soil type, soil moisture level, and soil drying-rewetting frequency (D-RW) on microbial C and N mineralization of litter and soil organic matter (SUM) in a full-factorial, controlled incubation experiment. Four levels of litter quality (no litter; or litter from Bouteloua curtipendula grown under 280, 380, 500 mu L L-1 CO2) were surface-applied to three contrasting soils common to Blackland Prairie landscapes: an upland Mollisol,. a lowland Vertisol, and a fluvial Alfisol. Different soil moisture regimes were tested by incubating soils at four moisture levels (air-dry, 25%, 35%, or 50% water-holding capacity, WHC) and by drying-rewetting soils 0, 1, 2, 4 or 8 times over the 112-d incubation period. Litter additions stimulated microbial activity, increasing total CO2 production (i.e. C mineralized from litter + SUM decomposition) up to 17x more than no-litter controls (average 3 x) and decreasing net N mineralization up to -3 x less (average -0.5 x) due to greater microbial N immobilization. Neither C nor N mineralization, however, was affected by litter quality. For all soils, litter decomposition increased with increasing WHC and D-RW frequency, but the average percent of total CO2 derived from litter was a negative function of SUM content. Similarly, net N mineralization also was positively correlated with soil WHC and affected most strongly by soil type (Alfisol < Mollisol < Vertisol). Net N mineralization responses to D-RW events was also soil-specific, with Alfisol soils showing no response and Mollisol and Vertisol soils decreasing after 4 D-RW events. Our results suggest that predicted changes in rainfall patterns and its interactions with soil type across the landscape will control short-term C and N mineralization responses in grasslands to a greater extent than atmospheric CO2-induced changes in litter C:N ratio for this common species of prairie grass. Published by Elsevier Ltd.


英文关键词Litter decomposition C mineralization Net N mineralization Grassland Global change Bouteloua curtipendula
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000317158300022
WOS关键词MOJAVE DESERT SOILS ; ELEVATED CO2 ; TALLGRASS PRAIRIE ; NITROGEN MINERALIZATION ; CARBON DYNAMICS ; ORGANIC-MATTER ; LEAF-LITTER ; RESIDUE DECOMPOSITION ; SPECIES COMPOSITION ; WATER RELATIONS
WOS类目Soil Science
WOS研究方向Agriculture
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/179967
作者单位1.Univ Nebraska, ARS, USDA, Agroecosyst Management Res Unit, Lincoln, NE 68583 USA;
2.ARS, USDA, Grassland Soil & Water Res Lab, Temple, TX 76502 USA
推荐引用方式
GB/T 7714
Jin, Virginia L.,Haney, Richard L.,Fay, Philip A.,et al. Soil type and moisture regime control microbial C and N mineralization in grassland soils more than atmospheric CO2-induced changes in litter quality[J],2013,58:172-180.
APA Jin, Virginia L.,Haney, Richard L.,Fay, Philip A.,&Polley, H. Wayne.(2013).Soil type and moisture regime control microbial C and N mineralization in grassland soils more than atmospheric CO2-induced changes in litter quality.SOIL BIOLOGY & BIOCHEMISTRY,58,172-180.
MLA Jin, Virginia L.,et al."Soil type and moisture regime control microbial C and N mineralization in grassland soils more than atmospheric CO2-induced changes in litter quality".SOIL BIOLOGY & BIOCHEMISTRY 58(2013):172-180.
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