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首页> 外文期刊>Plant and Soil >Temporal changes in C, P and N concentrations in soil solution followingapplication of synthetic sheep urine to a soil under grass
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Temporal changes in C, P and N concentrations in soil solution followingapplication of synthetic sheep urine to a soil under grass

机译：在草皮下施用合成绵羊尿液后，土壤溶液中C，P和N浓度的时间变化

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We have determined the temporal changes in the concentration of dissolved organic carbon (DOC) and P and N components in soil solution following application of synthetic sheep urine (500 kg N ha(-1)) to a brown forest soil in boxes sown with Agrostis capillaris. Three contrasting defoliation treatments (no cutting, single cut before urine application and regular cutting twice per week) plus a fallow soil were studied. The synthetic urine contained N-15 labelled urea and was P-free. Intact soil cores were taken after 2, 7, 14, 21 and 56 d and centrifuged to obtain soil solution. The urea in the synthetic urine was rapidly hydrolysed in the soil, increasing soil solution pH, DOC and total dissolved phosphorus (TDP) concentrations. For the regularly defoliated sward, DOC and P reached maximum concentrations (4000 mg DOC L-1 and 59 mg TDP L-1) on day 7. From their peak values, pH and DOC and P concentrations generally decreased with time and at day 56 were near those of the control. Concentrations of NH4+ and NO3- in the no-urine treatments fluctuated and the greatest treatment differences were between the fallow soil and the soil sown with grass. Adding synthetic urine increased NH4+ concentrations during the first week, but NO3- concentrations decreased. This was consistent with the (1)5N labelling of the NO3- pool which required 3 weeks to reach that of (NH4+)-N-15. Dissolved organic nitrogen (DON) reached a maximum value at day 7 with a concentration of 409 mg N L-1. The DON in soil solution contained no detectable amounts of N-15 label indicating that it was derived from sources in the soil. Differences in soil solution composition related to the effect of the other cutting treatments and the fallow treatment were small compared to the effect of synthetic urine addition.
机译：我们已经确定了将人工合成的绵羊尿液（500 kg N ha（-1））施用到用Agrostis播种的棕色森林土壤中后，土壤溶液中溶解有机碳（DOC）以及磷和氮成分的浓度随时间的变化。毛细血管。研究了三种对比性的脱叶处理方法（不切割，不使用尿液前一次切割和每周两次常规切割）以及休闲土壤。合成尿含有N-15标记的尿素，并且不含P。在2、7、14、21和56 d后取完整的土壤核心，然后离心以获得土壤溶液。合成尿中的尿素在土壤中迅速水解，从而增加了土壤溶液的pH值，DOC和总溶解磷（TDP）浓度。对于定期落叶的草地，DOC和P在第7天达到最大浓度（4000 mg DOC L-1和59 mg TDP L-1）。从其峰值，pH和DOC和P的浓度通常随时间和第56天下降。接近对照组。在非尿液处理中，NH4 +和NO3-的浓度波动不定，最大的处理差异是在休耕土壤和草种土壤之间。在第一周内，添加合成尿会增加NH4 +的浓度，但NO3-的浓度会降低。这与NO3库的（1）5N标记一致，需要3周才能达到（NH4 +）-N-15。溶解有机氮（DON）在第7天达到最大值，浓度为409 mg N L-1。土壤溶液中的DON不含可检测量的N-15标记，表明它来自土壤中的来源。与添加其他尿液的效果相比，与其他切割处理和休闲处理的效果相关的土壤溶液成分差异很小。

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