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首页> 外文期刊>Bioenergy research >Seasonal Changes in Shoot and Root Nitrogen Distribution in Switchgrass (Panicum virgatum)
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Seasonal Changes in Shoot and Root Nitrogen Distribution in Switchgrass (Panicum virgatum)

机译：柳枝Shoot（Panicum virgatum）的芽和根系氮分布的季节性变化

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Switchgrass is a promising bioenergy source that is perennial, productive, native to a broad geographic region, and can grow on marginal, nitrogen (N)-poor soils. Understanding N dynamics in switchgrass is critical to predicting productivity, conserving N, and optimizing the timing of harvest. We examined seasonal changes in N distribution in above- and belowground tissues in switchgrass to quantify N retranslocation rates. Above- and belowground biomass from three sites (two in PA and one in NE) were collected and analyzed for biomass growth and N concentrations at 30-day intervals from June through October. Total living plant mass ranged from 10.3 ± 2.4 standard error (SE) to 14.9 ± 2.5 SE Mg ha−1. Belowground mass comprised 52–57 % of total mass. Blades had the highest N concentration during summer, ranging from 6 to 22 g kg−1 N. Aboveground N concentrations decreased from September until autumn senescence, whereas belowground N concentration increased from August until senescence. Across the sites, total N retranslocated from aboveground to belowground components between September and October averaged 16.5 ± 7.1 (SE) kg ha−1 N representing 26.7 % of the average maximum N content of aboveground biomass. Based on N fertilizer costs, delayed harvest would conserve some N and provide financial savings on fertilizer ($9 ha−1) if harvest occurs after senescence but before overwinter biomass loss. However, biomass losses of even 10 % will negate potential economic savings accrued from N retention. To maximize environmental and economic savings from N retranslocation and to simultaneously minimize harvest losses, it would be optimal to harvest switchgrass as soon as possible after complete senescence.
机译：柳枝is是一种有前途的生物能源，多年生，高产，原生于广阔的地理区域，可以在贫瘠的贫瘠土壤上生长。了解柳枝N中的氮动态对于预测生产力，保护氮和优化收获时机至关重要。我们检查了柳枝above地下和地下组织中N分布的季节性变化，以量化N的重新定位率。从6月到10月的30天间隔内，收集了三个地点（PA中两个，NE中一个）的地上和地下生物量，并分析了生物量的增长和氮的浓度。活植物的总质量范围从10.3±±2.4标准误差（SE）到14.9±±2.5 SE Mg·ha-1。地下质量占总质量的52–57％。夏季叶片叶片氮含量最高，从6至22 g·kg-1 N.地上氮含量从9月到秋季衰老下降，而地上氮含量从8月到衰老增加。在整个站点上，9月至10月之间从地上部分转移到地下部分的总N平均为16.5±7.1（SE）·kg·ha-1 N，占地上生物量平均最大N含量的26.7％。根据氮肥成本，如果收获发生在衰老之后但越冬生物量损失之前，延迟的收获将节省一些氮并为肥料节省财务（9 ha-1）。但是，即使10％的生物量损失也将抵消氮保留带来的潜在经济节省。为了最大程度地减少氮素迁移带来的环境和经济节省，并同时最大程度地减少收获损失，最好在完全衰老后尽快收获柳枝switch。

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