A 15N-Labeling Study of the Capture of Deep Soil Nitrate from Different Plant Systems

YANG Zhi-xin; WANG Jue; DI Hong-jie; ZHANG Li-juan; JU Xiao-tang

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A 15N-Labeling Study of the Capture of Deep Soil Nitrate from Different Plant Systems

机译：15N标记研究不同植物系统中深层土壤硝酸盐的捕获

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The objective of this study was to determine the efifciency of different plant systems in capturing deep soil nitrate (NO3-) to reduce NO3-leaching in a ifeld plot experiment using 15N labelling. The study was conducted on a calcareous alluvial soil on the North China Plains and the plant systems evaluated included alfalfa (Medicago sativa), American black poplar (Populus nigra) and cocksfoot (Dactylis). 15N-labelled N fertilizer was injected to 90 cm depth to determine the recovery of 15N by the plants. With conventional water and nutrient management, the total recovery of 15N-labeled NO3--N was 23.4% by alfalfa after two consecutive growth years. The recovery was signiifcantly higher than those by American black poplar (12.3%) and cocksfoot (11.4%). The highest proportion of soil residual 15N from the labeled fertilizer N (%Ndff) was detected around 90 cm soil depth at the time of the 1st year harvest and at 110-130 cm soil depth at time of the 2nd year harvest. Soil%Ndff in 0-80 cm depth was signiifcantly higher in the alfalfa treatment than those in all the other treatments. The soil%Ndff below 100 cm depth was much lower in the alfalfa than those in all the other treatments. These results indicated that 15N leaching losses in the alfalfa treatment were signiifcantly lower than by those in the black poplar and cocksfoot treatments, due to the higher root density located in nitrate labeling zone of soil proifle. In conclusion, alfalfa may be used as a plant to capture deep soil NO3-left from previous crops to reduce NO3-leaching in high intensity crop cultivation systems of North China Plain.

机译：这项研究的目的是确定使用15N标记的田间田间试验中，不同植物系统在捕获深层土壤硝酸盐（NO3-）以减少NO3淋失方面的效率。该研究是在华北平原的钙质冲积土壤上进行的，所评估的植物系统包括苜蓿（Medicago sativa），美洲黑杨（Populus nigra）和cock（Dactylis）。将15N标记的氮肥注入90厘米深，以确定植物对15N的回收率。在常规的水和养分管理下，苜蓿经过连续两年的生长，其15N标记的NO3--N的总回收率为23.4％。复苏显着高于美洲黑杨（12.3％）和鸡爪（11.4％）。在第一年收获时大约90 cm的土壤深度处以及第二年收获时在110-130 cm的土壤深度处检测到来自标记肥料N（％Ndff）的最高土壤残留15N比例。在苜蓿处理中，0-80 cm深度的土壤％Ndff显着高于所有其他处理。苜蓿中低于100 cm深度的土壤％Ndff远低于所有其他处理方法。这些结果表明，紫花苜蓿处理中15N的淋失损失明显低于黑杨和赤脚处理中的氮，这是由于土壤根部硝酸盐标记区的根系密度更高。总之，紫花苜蓿可以作为一种植物来捕获华北平原高强度作物栽培系统中以前作物留下的深层土壤NO3，以减少NO3的淋失。

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《农业科学学报（英文版）》 |2014年第1期|167-176|共10页
作者
YANG Zhi-xin; WANG Jue; DI Hong-jie; ZHANG Li-juan; JU Xiao-tang;
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作者单位

Key Laboratory for Farmland Eco-Environment, Hebei Province/College of Resource and Environmental Sciences, Agricultural University of Hebei, Baoding 0710001, P.R.China;

Key Laboratory for Farmland Eco-Environment, Hebei Province/College of Resource and Environmental Sciences, Agricultural University of Hebei, Baoding 0710001, P.R.China;

Centre for Soil and Environmental Research, P0 Box 85084, Lincoln University, Lincoln 7647, New Zealand;

Key Laboratory for Farmland Eco-Environment, Hebei Province/College of Resource and Environmental Sciences, Agricultural University of Hebei, Baoding 0710001, P.R.China;

College of Agricultural Resources and Environmental Sciences, China Agricultural University, Beijing 100193, P.R.China;

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A 15N-Labeling Study of the Capture of Deep Soil Nitrate from Different Plant Systems

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