引用本文:王擎运,杨远照,徐明岗,陈 景,郜红建,陈 林,张佳宝,柴如山,叶新新,周云鹏.长期秸秆还田对砂姜黑土矿质复合态有机质稳定性的影响[J].土壤学报,2019,56(5):1108-1117.
WANG Qingyun,YANG Yuanzhao,XU Minggang,CHEN Jing,GAO Hongjian,CHEN Lin,ZHANG Jiabao,CHAI Rushan,YE Xinxin,ZHOU Yunpeng.Effects of Long-term Straw Returning on Stability of Mineral-complexed Organic Matter in Shajiang Black Soil[J].Acta Pedologica Sinica,2019,56(5):1108-1117
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长期秸秆还田对砂姜黑土矿质复合态有机质稳定性的影响
王擎运1, 杨远照1, 徐明岗1, 陈 景1, 郜红建1, 陈 林2, 张佳宝2, 柴如山1, 叶新新1, 周云鹏1
1.农田生态保育与污染防控安徽省重点实验室,安徽农业大学资源与环境学院;2.土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所)
摘要:
依托10 a定位试验研究了秸秆还田对典型砂姜黑土有机矿质复合体中有机质稳定性的影响机制。田间试验设置5个处理:氮磷钾配施下的小麦和玉米秸秆双季还田(WMS+F)、小麦秸秆还田(WS+F)、玉米秸秆还田(MS+F)、非秸秆还田(F)处理,以不施肥模式下的非秸秆还田为对照(CK)。结果显示,铁铝键合态和紧密结合态有机质含量累计占土壤总有机质的88.70%,且三者变化趋势一致,均呈现WS+F≈WMS+F≈MS+F>F>CK,并与土壤短程有序、有机结合态铁铝氧化物呈显著正相关,但与非晶型铁铝氧化物呈负相关性。秸秆还田显著促进了土壤有机质累积,并受到土壤铁铝键合态有机质的影响,但由于非晶型铁铝氧化物生成速度较慢,限制了土壤有机质的进一步累积。土壤紧密结合态有机质对其全量的贡献明显高于铁铝键合态有机质,相关机制值得进一步研究。
关键词:  秸秆还田  有机质累积  有机矿质复合体  非晶型铁铝氧化物
DOI:10.11766/trxb201812130546
分类号:
基金项目:国家重点研发计划项目(2016YFD0300801,2016YFD0300901)、耕地培育技术国家工程实验室开放基金项目(201705)和土壤与农业可持续发展国家重点实验室开放课题(Y20160014)资助
Effects of Long-term Straw Returning on Stability of Mineral-complexed Organic Matter in Shajiang Black Soil
WANG Qingyun1, YANG Yuanzhao1, XU Minggang1, CHEN Jing1, GAO Hongjian1, CHEN Lin2, ZHANG Jiabao2, CHAI Rushan1, YE Xinxin1, ZHOU Yunpeng1
1.Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University;2.State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences
Abstract:
【Objective】Organo-mineral complex is a kind of substance with soil organic colloidscomplexed with mineral colloids through surface molecular condensation, cation bridging and hydrogen bonding, which plays crucial role instabilization and accumulation of soil organic matter (SOM). Organo-mineral complexes are formed through interactions between organic matter (OM), mineral cations, metal oxides and soil clay minerals. Based on a long-term (10a) stationary experiment of straw returning to the field, this paper explores mechanism of straw returning affecting stability and accumulation of OM within organo-mineral complexes in typical Shajiang black soil, and systematically analyze distribution characteristics of OM content and mechanisms of OM complexing with metal cations and oxides typical in the soil, in an attempt to find out the key mechanism that constrains organic matter accumulation in Shajiang black soil.【Method】The long-term field experiment, which has been carried on since 2007, is designed to have five treatments, i.e. WMS+F (application of mineral NPK plusreturning of both wheat and maize straws), WS+F (application of mineral NPK plus returning of wheat straw only), MS+F (application of mineral NPK plus returning of maize stalks only), F (application of mineral NPK only) and CK (no-fertilization). 【Result】Results show that OM within the organo-mineral complexes existed mainly in the form of Fe/Al-bound organic matter (Fe/Al-OM) and tightly combined organic matter (TCOM), and both of them added up to 88.70% of the total organic matter (TOM). In terms of contents of the three forms of organic matters (Fe/Al-OM, TCOM and TOM), the five treatments followed an order of WS+F≈ WMS+F≈ MS+F>F>CK. Fe/Al-OM, TCOM and TOM was significantly and positively related to soil short-range ordered and organo-bound Fe/Al oxides, and negatively to amorphous Fe/Al oxides in content. 【Conclusion】Straw returning remarkably promotes the accumulation of SOM, which is affected by Fe/Al-OM. The slow formation of amorphous Fe/Al oxides brings about deficiency in content, thus restricting further accumulation of SOM. Although accumulation of Ca and Mg is one of the typical properties in Shajiang black soil, it has little impact on formation of OM in soil organo-mineral complexes because they are easily leached out. What’s more, the contribution of TCOM to TOM is significantly higher than that of Fe/Al-OM, of which relevant mechanism deserves further study.
Key words:  Straw returning  Accumulation of organic matter  Organo-mineral complex  Amorphous Fe/Al oxides