Variability of Barley Radiation‐Use Efficiency
Variability of Barley Radiation‐Use Efficiency
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DOI：
10.2135/cropsci2004.1662
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发表时间：
2004-09
期刊：
影响因子：
2.3
通讯作者：
A. Kemanian;C. Stöckle;D. Huggins
中科院分区：
文献类型：
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作者：
A. Kemanian;C. Stöckle;D. Huggins
辐射利用效率（e）是一个与作物有关的系数，广泛用于作物模拟模型以及作物对环境和管理做法反应的生理解释。我们的目的是：（i）确定春大麦（Hordeum vulgare L.）的e，(ii)分析天气变量和太阳辐照度拦截分数（f i）对e的影响，以及（iii）比较大麦和小麦（Triticum aestivum L.）大麦的尺寸田间试验于2000年和2001年在华盛顿州的普尔曼进行。处理包括两个春大麦品种（Baronesse和Steptoe）的因子组合，两个播种密度（250和100株m-2），和两个播种日期（正常和晚）。在作物的生命周期和地上生物量从每周到每两周的样本中获得的树冠下安装的管日光计测量截获的辐射。两个品种的太阳辐射消光系数均为0.43，播期和密度对其影响不大。品种、密度和f对e无影响，但在正常播种期，两个年份的e均大于晚播期（2000年和2001年第一次播种期分别为1.15和1.19gMJ-1，第二次播种期分别为0.90和0.95gMJ-1，P < 0.01）。这些变化与白天水汽压亏缺（D）相关。大麦和小麦的e与D（kPa）呈线性关系：e = 1.88 - 0.53D（r2 = 0.70，n = 22）。大麦和小麦的最大e值接近1.6g MJ-1，但我们的分析表明，这些高值只能在低D环境中实现。在解释测得的e或在作物模拟模型中使用e时，应考虑大气蒸发需求的影响。
Radiation-use efficiency (e) is a crop-dependent coefficient widely used in crop simulation models and in the physiological interpretation of crop response to the environment and management practices. Our objectives were to: (i) determine the e of spring barley (Hordeum vulgare L.), (ii) analyze the impact of weather variables and fraction of solar irradiance intercepted (f i ) on e, and (iii) compare reported estimates of e for barley and wheat (Triticum aestivum L.) with our measurements for barley. Field experiments were conducted in 2000 and 2001 at Pullman, WA. Treatments consisted of factorial combinations of two cultivars of spring barley (Baronesse and Steptoe), two seeding densities (250 and 100 plants m -2 ), and two seeding dates (normal and late). Intercepted radiation was measured with tube solarimeters installed below the canopy during the crops life cycle and aboveground biomass obtained from weekly to biweekly samples. The extinction coefficient for solar radiation of both cultivars was 0.43, with no effect of seeding date and density. Cultivar, plant density, and f did not affect e; however, e at the normal seeding date was greater than at the late seeding date in both years (1.15 and 1.19 g MJ -1 , first seeding date, and 0.90 and 0.95 g MJ -1 , second seeding date, Years 2000 and 2001, respectively, P < 0.01). These variations were correlated with daytime vapor pressure deficit (D). The e of barley and wheat reported in the literature and those obtained in this study were linearly related to D (kPa): e = 1.88 - 0.53D (r 2 = 0.70, n = 22). Maximum values of e reported for barley and wheat are near 1.6 g MJ -1 , but our analysis suggests that these high values can only be achieved in low D environments. The effect of the evaporative demand of the atmosphere should be considered in the interpretation of measured e or in the use of e in crop simulation models.