| 利用原状土柱研究华中地区菜地土壤氮素的矿化规律 |
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| 引用本文： | 赵长盛,胡承孝,黄魏,孙学成,谭启玲.利用原状土柱研究华中地区菜地土壤氮素的矿化规律[J].土壤通报,2012(4):883-889. |
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| 作者姓名： | 赵长盛 胡承孝 黄魏 孙学成 谭启玲 |
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| 作者单位： | 华中农业大学微量元素中心,资源与环境学院,农业部长江中下游耕地保育重点实验室 |
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| 基金项目： | 农业部“948”项目“氮淋失预测模型引进及其在菜地氮营养管理上的应用”(2003-Z54);山东省科学院博士基金(科基合字(2010)第20号);国家重大科技水专项(2009ZX07210-009) |
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| 摘 要： | 本文以华中地区两种典型的菜地土壤-黄棕壤和潮土为研究对象,采用原状土柱系统,综合考虑了大气干湿沉降、灌溉、作物携出及淋失等氮素的影响因素,通过菜地轮作(2年8季蔬菜),研究了两种土壤氮素的矿化特性。结果表明,黄棕壤氮素的矿化总量和矿化速率分别为134.52 mg和0.04 mg kg-1 d-1;潮土的矿化总量和矿化速率分别为185.93 mg和0.06mg kg-1 d-1。研究还发现,土壤氮素的矿化受季节影响较大,春夏季土壤氮素的矿化量和矿化率明显高于秋冬季,同时耕作能明显增加菜地土壤氮素的矿化量与矿化速率。试验期间通过大气沉降输入的氮素总量为118.89 mg,是氮素输入的主要方式,而湿沉降约为氮素沉降总量的81.05%。黄棕壤和潮土氮素蔬菜作物氮素的携出量分别为178.96和230.37 mg;氮素淋失量分别为103.32和113.27 mg。
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| 关 键 词： | 菜地 潮土 黄棕壤 氮素矿化 大气沉降 原状土柱 |
The Mineralization of Nitrogen from Intensively Irrigated Vegetable Field of Central China:A Soil Core Lysimeter Study |
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| Institution: | ZHAO Chang-sheng,HU Cheng-xiao,HUANG Wei,SUN Xue-cheng,TAN Qin-ling(Trace elements Center,Huazhong Agricultural University,Department of Resourse and Environment,Huazhong Agricultural University;Key Laboratory of land Vonservation of Lower Yangtze Region,Ministry of Agiculture,Wuhan 430070,China.) |
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| Abstract: | We took into account the factors of nitrogen input and output such as atmospheric deposition,irrigation,vegetable crop uptake and nitrogen leaching,and used the undisturbed soil lysimeter to research N-mineralization of two kinds of typical vegetable soils(Yellow-brown and Fluvo-aquic soil) in central China by the means of 8 vegetable season rotation over 2 years.The result indicated that the total amounts and rates of N-mineralization in Yellow-brown soil were 134.52 mg and 0.04 mg kg-1 d-1,respectively,and those of Fluvo-aquic soil were 185.93 mg and 0.06 mg kg-1 d-1,respectively.Seasonal factor greatly influences N-mineralization,and both amounts and rates of N-mineralization in two soils both ordered as spring-summer>autumn-winter.Farming practices could enhance the amounts of N-mineralization.The amount of total nitrogen input was 118.89 mg from atmospheric deposition,which being the main nitrogen input in this trial.The wet atmospheric deposition accounted for 81.05% of nitrogen atmospheric deposition input.The amounts of vegetable N-output in Fluvo-aquic soil and yellow-brown soil were 178.96 and 230.37 mg,respectively;nitrogen leaching amounts were 103.32 and 113.27 mg,respectively. |
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| Keywords: | Vegetable field Fluvo-aquic soil Yellow-brown soil N-mineralization Atmospheric deposition Intact soil core |
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