Dynamics of maize straw residue C-13 incorporation into aggregates of a Mollisol as affected by long-term fertilization

文献类型： 外文期刊

第一作者： Li, Ming

作者： Li, Ming;Wang, Yang;Ding, Fan;Xu, Yingde;Ding, Xueli;Wang, Jingkuan;Zhu, Ping

作者机构：

关键词： C-13-labeled plant residue; Aggregate size fraction; Carbon sequestration; Fertilization

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.308； 五年影响因子：3.586 ）

ISSN： 1439-0108

年卷期： 2019 年 19 卷 3 期

页码：

收录情况： SCI

摘要： PurposeSoil aggregates play a crucial role in the sequestration of soil organic carbon (SOC). Returning crop residues to soil is known to strongly influence soil C stocks, but the specific contribution of crop residues to soil aggregates influenced by long-term fertilization remains largely unknown. This study investigated the effects of long-term fertilization on the distribution of C-13-labeled maize straw residue in different aggregate size fractions and their retention in soils over a 1-year incubation.Materials and methodsThe dynamic variation and the distribution of maize straw-derived C-13 in soil aggregates were monitored using a C-13 stable isotope mass-balance approach. The following three fertilization treatments were selected: (1) without fertilization (CK), (2) mineral fertilizer (NPK), and (3) cow manure with mineral fertilizer (NPKM). Soil samples were collected from the surface layer (0-20cm) of a long-term field experiment of Mollisols (Luvic Phaeozem) in 2015 at Gongzhuling, Jilin Province, China, which was established in 1980. Soils were incubated for 360days at 25 degrees C, with or without C-13-labeled maize straw and destructively collected on the days of 45, 90, 135, 180, and 360. Soil aggregates were separated into two fractions (macroaggregates, >250m; microaggregate, <250m) by wet sieving.Results and discussionThe NPK treatment retained the most of maize straw C-13 in macroaggregates (28.49%), but more maize straw C-13 was incorporated in microaggregates for NPKM soil (4.02%) than NPK and CK on day 45. The highest amount of maize straw C-13 was incorporated in macroaggregate on the days of 90, 135, and 180, and in microaggregate on the days of 135, 45, and 135 for CK, NPK, and NPKM, respectively. Organic manure-amended soil tended to sequester more maize straw C-13 in the microaggregate fractions as compared with the NPK and CK treatments throughout the incubation. The maize straw C-13 remaining in both of macro- and microaggregates followed the order of NPKM>NPK>CK for all soil aggregates after the 360-day incubation.ConclusionsOur results illustrated that long-term application of manure with mineral fertilizer helps to stabilize or increase the retention of exogenous C in the soil aggregates.

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