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长期施肥对典型潮土钙、镁形态转化及其环境行为的影响
王擎运1, 张佳宝1, 赵炳梓1, 信秀丽1, 陈 林1, 周云鹏2, 郜红建2
1.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);2.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
摘要:
研究了长期(1989—2009年)不同施肥处理下潮土钙、镁累积特征及形态转化规律,探讨了两种典型盐基阳离子及其碳酸盐在农田土壤酸碱缓冲性能、有机质累积等环境过程中的作用。田间试验设置7个处理:有机肥(OM)、OM+无机化肥氮磷钾(NPK)、NPK、NP、PK、NK和不施肥(CK), OM+NPK处理为有机肥和无机化肥氮磷钾各施一半。气量法结合BCR形态分析结果显示,不同施肥条件下潮土耕层(0 ~ 20 cm)钙、镁元素均出现持续累积过程,不同处理的累积量表现为:NK
关键词:  长期施肥  钙、镁形态  土壤缓冲体系  有机质稳定
DOI:10.13758/j.cnki.tr.2020.03.008
分类号:S153
基金项目:国家重点研发计划项目(2016YFD0300801, 2016YFD0300901)、土壤与农业可持续发展国家重点实验室开放基金项目(Y20160014)、和耕地培育技术国家工程实验室开放基金项目(201705)资助。
Effects of Long-term Fertilization on Calcium and Magnesium Morphological Transformation and Environmental Behavior in Typical Fluvo-aquic Soil
WANG Qingyun1, ZHANG Jiabao1, ZHAO Bingzi1, XIN Xiuli1, CHEN Lin1, ZHOU Yunpeng2, GAO Hongjian2
1.State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences;2.Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University
Abstract:
In this paper, the accumulation and morphological transformation of calcium (Ca) and magnesium (Mg) in typical fluvo-aquic soil under different long-term (1989–2009) fertilization treatments were studied and the roles of Ca2+, Mg2+ and carbonate to soil buffering ability and organic matter accumulation were explored. 7 fertilization treatments were designed in the field experiment: 1) CK (non-fertilized control), 2) OM (organic manure), 3) OM + NPK (50% organic manure + 50% mineral fertilizer), 4) NPK, 5) NP, 6) PK and 7) NK. The results obtained by volume method and the modified BCR-sequential extraction method showed that the contents of Ca and Mg in topsoil (0-20 cm) accumulated continuously, and were in the order of NK < OM < OM+NKP < NPK < NP < PK < CK, which was in accordance with the contents of soil crystal lattice-bound Ca and Mg and carbonate-bound Ca and Mg, while contrary to the contents of metal oxide-bound and organo-bound Ca and Mg. pH, contents of Ca and Mg were lower under OM treatment, but OM treatment had little impact on the content of soil carbonate. CaCO3 is the main carbonates in soil, followed by MgCO3, they are bound to soil organic matter to form a complex acid-base buffering system in soil. Compared with Mg2+, Ca2+ are easier to bind to the metallic oxide, whereas are weaker to be bound to soil organic matter, which may inhibit the formation of soil organo-mineral complexes.
Key words:  Long-term fertilization  Morphology of calcium and magnesium  Soil buffering system  Stabilization of organic matter

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