| 三峡库区柑橘园施肥量对土壤氮淋失及残留量的影响 |
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| 引用本文： | 王甜,黄志霖,曾立雄,肖文发,宋文梅.三峡库区柑橘园施肥量对土壤氮淋失及残留量的影响[J].环境科学,2019,40(3):1468-1474. |
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| 作者姓名： | 王甜 黄志霖 曾立雄 肖文发 宋文梅 |
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| 作者单位： | 中国林业科学研究院森林生态环境与保护研究所,国家林业局森林生态环境重点实验室,北京 100091;湖北省秭归县林业局,宜昌,443631 |
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| 摘 要： | 本试验以三峡库区秭归县生态站所在流域内的柑橘园土壤作为研究对象,通过0～20、0～40、0～60 cm深度的原状土柱淋溶试验对不同施肥量对柑橘园土壤中氮素淋失及残留量的影响进行研究.试验中设置4种施肥处理,为不施肥处理(CK)、低氮施肥处理(T1:250 kg·hm~(-2))、中氮施肥处理(T2:500 kg·hm~(-2))、高氮施肥处理(T3:750 kg·hm~(-2)).结果表明:①柑橘园土壤中氮素淋失的主要形态为硝态氮(NO_3~--N),占总氮(TN)淋失量的36. 93%～60. 07%,铵态氮(NH_4~+-N)的比例为4. 40%～5. 79%.土壤中NO_3~--N残留量占TN残留量的比例为11. 31‰～45. 66‰,NH_4~+-N残留量的比例为1. 05‰～2. 07‰;②相同深度的柑橘园土壤中,氮素的淋失量和残留量与施肥量呈显著正相关.不同施肥量下土壤中TN的淋失量和残留量分别为11. 35～30. 11 kg·hm~(-2)和0. 30～1. 86 g·kg~(-1).其中,NO_3~--N和NH_4~+-N的淋失量占TN淋失量的比例在T2处理下达到峰值,NO_3~--N和NH_4~+-N的残留量占TN残留量比例峰值分别出现在T1和T2处理;③相同施肥量下,土壤中氮素不同形态的淋失量和残留量受土壤深度影响的差异较大.施肥后,NO_3~--N淋失量和残留量的峰值分别出现在20cm和40 cm深度,NH_4~+-N淋失量和残留量的峰值主要出现在20 cm深度.从试验中的结果推论,0～40 cm土柱中的中氮处理更有利于肥料氮向无机态氮转化以供植物吸收并降低施肥后氮素淋失的风险.
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| 关 键 词： | 三峡库区 柑橘园土壤 施肥量 氮 淋失及残留量 |
| 收稿时间： | 2018/5/17 0:00:00 |
| 修稿时间： | 2018/7/24 0:00:00 |
Effects of Fertilization on the Nitrogen Residual Amounts and Leaching from Citrus Orchard Soil in the Three Gorges Reservoir Area |
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| WANG Tian,HUANG Zhi-lin,ZENG Li-xiong,XIAO Wen-fa and SONG Wen-mei.Effects of Fertilization on the Nitrogen Residual Amounts and Leaching from Citrus Orchard Soil in the Three Gorges Reservoir Area[J].Chinese Journal of Environmental Science,2019,40(3):1468-1474. |
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| Authors: | WANG Tian HUANG Zhi-lin ZENG Li-xiong XIAO Wen-fa and SONG Wen-mei |
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| Institution: | State Forestry Administration Key Laboratory of Forest Ecology and Environment, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China,State Forestry Administration Key Laboratory of Forest Ecology and Environment, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China,State Forestry Administration Key Laboratory of Forest Ecology and Environment, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China,State Forestry Administration Key Laboratory of Forest Ecology and Environment, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China and Forestry Bureau of Zigui County, Yichang 443631, China |
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| Abstract: | |
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| Keywords: | Three Gorges Reservoir Area citrus orchard soil fertilization nitrogen leaching and residual amounts |
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