| 夏季休闲期不同年限日光温室土壤硝态氮淋溶状况 |
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| 引用本文： | 刘晓军,周建斌,陈竹君,王 媛,丁小龙.夏季休闲期不同年限日光温室土壤硝态氮淋溶状况[J].农业工程学报,2010,26(13):272-278. |
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| 作者姓名： | 刘晓军 周建斌 陈竹君 王 媛 丁小龙 |
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| 作者单位： | 西北农林科技大学资源环境学院，杨凌 712100;西北农林科技大学资源环境学院，杨凌 712100;西北农林科技大学资源环境学院，杨凌 712100;西北农林科技大学资源环境学院，杨凌 712100;西北农林科技大学资源环境学院，杨凌 712100 |
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| 基金项目： | 国家自然科学基金项目（40773057）；西安市农业科技攻关项目（GG04094）；西北农林科技大学拔尖人才支持计划（2006） |
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| 摘 要： | 连续2 a（2006和2007年）研究了夏季休闲前后陕西杨凌示范区13个日光温室0～200 cm土壤剖面氮素的动态变化，以评价夏季休闲期间日光温室栽培下土壤累积硝态氮的淋溶情况。结果表明：日光温室蔬菜收获后不同年限温室0～200 cm土壤剖面累积了大量的硝态氮，2006和2007年不同年限日光温室土壤剖面硝态氮的平均残留量分别为 667.6和781.8 kg/hm2。休闲近2个月后，休闲期间降雨量低的2006年（65 mm）不同温室土壤硝态氮含量及电导率与休闲前相比明显增加；而降雨量高的2007年（214 mm），土壤剖面残留的硝态氮及电导率显著降低，说明发生硝态氮的淋溶，13个日光温室0～200 cm 土壤剖面硝态氮较夏季休闲前降低量在223.8～658.0 kg/hm2之间，平均为298.5 kg/hm2。不同年限日光温室0～200 cm 土壤剖面硝态氮降低量相比，1998年温室＞2004年温室＞2002年温室，其中1998年的温室土壤剖面硝态氮降低量平均达355.1 kg/hm2。可见，夏季休闲期间的降雨量是影响日光温室栽培土壤累积大量硝态氮发生淋溶损失的主要因素。
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| 关 键 词： | 日光温室，硝态氮，淋溶，夏季休闲，土壤剖面 |
| 修稿时间： | 2009/11/3 0:00:00 |
Nitrate leaching from sunlight greenhouse soils with different cultivation years during summer fallow periods |
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| Liu Xiaojun,Zhou Jianbin,Chen Zhujun,Wang Yuan and Ding Xiaolong.Nitrate leaching from sunlight greenhouse soils with different cultivation years during summer fallow periods[J].Transactions of the Chinese Society of Agricultural Engineering,2010,26(13):272-278. |
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| Authors: | Liu Xiaojun Zhou Jianbin Chen Zhujun Wang Yuan and Ding Xiaolong |
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| Abstract: | Nitrate contents in 13 soil profiles of sunlight greenhouses and their changes during summer fallow periods were determined in two continuous years (2006 and 2007) in Yangling, Shaanxi Province to evaluate the accumulation and leaching loss of nitrate during the summer fallow. After harvesting the vegetable, excessive amount of nitrate was accumulated in the soil profiles. The average residual nitrate in 0-200 cm soil profiles after harvesting in 2006 and 2007 were 667.6 kg/hm2 (in the range of 492.2-800.4 kg/hm2) and 781.8 kg/hm2 (in the range of 491.2-1 070.7 kg/hm2), respectively. The contents of nitrate and electronic conductivity (EC) significantly increased after summer fallow in 2006 with less precipitation (65 mm); while the nitrate content and EC significantly decreased after fallow in 2007 with heavy precipitation (214 mm), indicating the leaching of nitrate in this year. The nitrate loss from 0-200 cm soil profiles was 298.5 kg/hm2, with the range of 223.8-658.0 kg/hm2 during summer fallow period in 2007. The extents of nitrate leaching were variable among different cultivated-years greenhouses. On average, the leaching loss of nitrate followed the order of greenhouses of 1998 >greenhouses of 2004 > greenhouses of 2002. It is concluded that the amount of precipitation during summer fallow is the key factor controlling the leaching loss of nitrate accumulated in soil profile of greenhouse. |
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| Keywords: | greenhouse nitrate leaching summer fallow soil profile |
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