Carbon and nitrogen mineralization as affected by drying and wetting cycles

被引:300
作者
Mikha, MM
Rice, CW
Milliken, GA
机构
[1] USDA ARS, Cent Great Plains Res Stn, Akron, CO 80720 USA
[2] Kansas State Univ, Dept Agron, Throckmorton Plant Sci Ctr 2004, Manhattan, KS 66506 USA
[3] Kansas State Univ, Dept Stat, Manhattan, KS 66506 USA
关键词
dry-wet cycles; carbon and nitrogen flush; aggregate destruction and size distribution;
D O I
10.1016/j.soilbio.2004.08.003
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Drying and rewetting of soil is an important process in soil aggregation, soil organic matter (SOM) decomposition, and nutrient cycling We investigated the source of the C and N flush that occurs upon rewetting of dry soil, and whether it is from microbial death and/or aggregate destruction. A moderately well drained Kennebec silt loam (Fine-silty, mixed, superactive, mesic Cumulic Hapludoll) was sampled to a 10 cm depth. Soil under constant water content (CWC) was compared with soil subjected to a series of four dry-wet (DW) cycles during the experimental period (96 d) and incubated at 25 degreesC. Mineralized C and N were measured during the drying and rewetting periods. Aggregate size distributions were studied by separating the soil into four aggregate size classes (> 2000, 250-2000, 53-250, and 2053 pm) by wet sieving. Repeated DW cycles significantly reduced cumulative N mineralization compared with CWC. The reduction in cumulative mineralized C resulting from DW compared with CWC increased as the DW treatments were subjected to additional cycles. The flush of mineralized C significantly decreased with repeated DW cycles. There was no significant effect on aggregate size distributions resulting from to the DW cycles compared with CWC treatment. Therefore, the flush of mineralized C and N seemed to be mostly microbial in origin in as much as aggregate distribution was unaffected by DW cycles. Published by Elsevier Ltd.
引用
收藏
页码:339 / 347
页数:9
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