| 不同形态氮素添加下三江源区高寒草甸草场氮素分配与利用 |
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| 引用本文： | 向雪梅,德科加,张琳,冯廷旭,林伟山,钱诗祎,魏希杰,王伟,徐成体,耿晓平.不同形态氮素添加下三江源区高寒草甸草场氮素分配与利用[J].植物营养与肥料学报,2023,29(3):511-520. |
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| 作者姓名： | 向雪梅 德科加 张琳 冯廷旭 林伟山 钱诗祎 魏希杰 王伟 徐成体 耿晓平 |
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| 作者单位： | 1.青海大学 / 青海省畜牧兽医科学院，青海西宁 810016 |
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| 基金项目： | 国家自然科学基金项目 (31860678)；青海三江源草地生态系统国家野外科学观测研究站称多子站建设项目（K9922050） |
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| 摘 要： | 【目的】研究三江源区高寒草甸牧草对不同形态氮素的吸收利用和残留氮素在土壤中的去向及分配，以期为制定三江源区高寒草甸草场养分科学添加方案提供理论依据。【方法】于2020年6月至2021年9月，在青海省称多县高寒草甸试验站开展15N田间微区示踪试验，试验设置3个不同氮素形态处理，分别为(15NH4)2SO4、Ca(15NO3)2、CO(15NH2)2，各处理的氮素施用量均为N 300 kg/hm2。分析了施肥当年和次年不同形态氮素在高寒草甸牧草地上部、地下部中的含量，及在0—15、15—30 cm土层土壤中的去向及分配。【结果】1)在施肥当年，与Ca(15NO3)2、(15NH4)2SO4<...
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| 关 键 词： | 氮素形态 高寒草甸 氮素去向 15N示踪技术 |
| 收稿时间： | 2022-08-02 |
Nitrogen allocation and utilization in alpine meadows of the Sanjiangyuan region under exogenous additions of different nitrogen forms |
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| XIANG Xue-mei,DE Ke-jia,ZHANG Lin,FENG Ting-xu,LIN Wei-shan,QIAN Shi-yi,WEI Xi-jie,WANG Wei,XU Cheng-ti,GENG Xiao-ping.Nitrogen allocation and utilization in alpine meadows of the Sanjiangyuan region under exogenous additions of different nitrogen forms[J].Plant Nutrition and Fertilizer Science,2023,29(3):511-520. |
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| Authors: | XIANG Xue-mei DE Ke-jia ZHANG Lin FENG Ting-xu LIN Wei-shan QIAN Shi-yi WEI Xi-jie WANG Wei XU Cheng-ti GENG Xiao-ping |
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| Institution: | 1.Qinghai University / Qinghai Academy of Animal Husbandry and Veterinary Science, Xining, Qinghai 810016, China |
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| Abstract: | 【Objective】 We studied the absorption and utilization of different N forms by alpine meadow plants, and the fate of residual N in the soil to provide a theoretical basis for efficient and environmentally friendly fertilization of alpine meadows in the Sanjiangyuan area. 【Methods】 A field microplot experiment was carried out using the 15N tracer method at the Alpine Meadow Experimental Station in Chengduo County, Qinghai Province, from June 2020 to September 2021. The three N sources tested were (15NH4)2SO4, Ca(15NO3)2, and CO(15NH2)2, applied at N 300 kg/hm2 in early 2020. The N content and uptake in the above- and under-ground parts of forages were measured, and the N content in the 0–15 cm and 15–40 cm soil layers was analyzed in 2020 and 2021. 【Results】 1) In the same year of N application, compared with Ca(15NO3)2 and (15NH4)2SO4, CO(15NH2)2 increased N absorption by 276.4% and 48.1% in the aboveground part, 360.3% and 129.2% in the underground part of forages, 275.6% and 78.4% for the N residual amount in the 0–15 cm soil layer, and 240.1% and 115.6% in the 15–30 cm soil layer (P<0.05) . 2) In the following year of N application, compared with Ca(15NO3)2 and (15NH4)2SO4, CO(15NH2)2 increased the N absorption in the aboveground part by 206.9% and 66.1%, 473.2% and 234.4% in the underground part of forages, 635.6% and 129.5% for residual N amount in 0–15 cm soil layer, and 22.5% and 188.2% in 15–30 cm soil layer (P<0.05). 3) In the same year of N application, the fate of (15NH4)2SO4 and Ca(15NO3)2 were in the order 15N loss>15N soil residue>15N plant uptake and 15N soil residue>15N plant uptake>15N loss for CO(15NH2)2. In the following year of N application, the fate of (15NH4)2SO4 and Ca(15NO3)2 were: 15N loss>15N plant absorption>15N soil residue and 15N plant absorption>15N loss>15N soil residue for CO(15NH2)2. 【Conclusion】 CO(15NH2)2 promotes a high nitrogen uptake rate by forages, lower loss rate, and higher soil residual nitrogen. Therefore, it can be used as the preferred nitrogen form in the alpine meadow pasture in the Sanjiangyuan region. |
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