Seasonal and inter-annual variation of leaching of dissolved organic carbon and nitrogen under long-term manure application in an acidic clay soil in subtropical China
Seasonal and inter-annual variation of leaching of dissolved organic carbon and nitrogen under long-term manure application in an acidic clay soil in subtropical China
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中国亚热带酸性粘土长期施用有机肥溶解性有机碳和氮淋溶的季节和年际变化
DOI：
10.1016/j.still.2014.09.020
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发表时间：
2015-03-01
影响因子：
6.5
通讯作者：
Sun, Bo
中科院分区：
文献类型：
--
作者：
Long, Guang-Qiang;Jiang, Yu-Ji;Sun, Bo
溶解性有机质（DOM）在土壤生物活性和污染物及养分的迁移中起着重要作用，但农业管理措施对酸性土壤中DOM动态和归宿的长期影响方面的信息很少。通过长期田间蒸渗试验，研究了亚热带酸性粘粒土（铁性acrisol）溶解性有机碳（DOC）和氮（DON）含量的季节和年际变化及其淋溶特征。试验于2002 - 2010年在玉米单作条件下进行，设4个施肥处理：不施肥（CK）、低肥配施150 kg N ha（-1）y（-1）（LM）、高肥配施600 kg N ha（-1）y（-1）（HM）、高氮肥600 kg·ha（-1）·y（-1），石灰3000 kg·Ca（OH）（2）·ha（-1）·y（-1）（HML）。施用有机肥导致土壤DOC和DON的季节性变化，有机肥DOC、微生物生物量和土壤含水量的影响显著。土壤DOC主要由土壤有机质和土壤含水量决定，在第7年趋于稳定。在酸性粘土上施用有机肥没有改变DOC的淋溶，而在施用600 kg N ha（-1）y（-1）的高有机肥3年后，DON的淋溶明显增加。在长期施用有机肥的情况下，年平均DON淋失量为3.8 - 5.4 kg/ha，占淋失总氮的6 - 11%。除增加CO2排放量外，石灰与有机肥配施对土壤动态和DOC、DON淋溶无明显影响。(C)2014爱思唯尔有限公司版权所有。
Dissolved organic matter (DOM) plays an important role in soil biological activity and transport of pollutants and nutrients in soils, but very little information is available with regard to the long-term impact of agricultural management practices on the dynamics and fate of DOM in acidic soils. The seasonal and inter-annual variation of dissolved organic carbon (DOC) and nitrogen (DON) contents and leaching were investigated in an acidic clay soil (Ferric Acrisol) by a long-term field lysimeter experiment in subtropical China. The experiment was conducted from 2002 to 2010 with 4 fertilization treatments under maize monoculture: no manure (CK), low-rate manure with 150 kg N ha(-1) y(-1) (LM), high-rate manure with 600 kg N ha(-1) y(-1) (HM), and high-rate manure with 600 kg N ha(-1) y(-1) and lime at 3000 kg Ca(OH)(2) ha(-1)3 y(-1) (HML). Manure application resulted in a seasonal variation of soil DOC and DON, and significant effects were observed by manure DOC, microbial biomass and soil water content. Soil DOC, which was mainly determined by soil organic matter and soil water content, increased yearly until the seventh year when it was stabilized. Manure application on acidic clay soil did not alter DOC leaching, whereas DON leaching clearly increased after three years of high manure application of 600 kg N ha(-1) y(-1). The average annual DON leaching losses under long-term manure application had a range of 3.8-5.4 kg ha(-1), accounting for 6-11% of total nitrogen leached. The addition of lime, combined with manure application, produced no impact on soil dynamics and leaching of DOC and DON, with the exception of increasing emission of CO2. (C) 2014 Elsevier B.V. All rights reserved.