Royo-Esnal Aritz, Gesch Russell W, Forcella Frank, Torra Joel, Recasens Jordi, Necajeva Jevgenija
Dpt. D'Hortofruticultura, Botànica i Jardineria, Agrotecnio, Universitat de Lleida. Alcalde Rovira Roure 191, 25198, Lleida, Spain.
USDA-ARS-North Central Soil Conservation Research Laboratory, 803 Iowa Avenue, Morris, Minnestoa, 56267, United States of America.
PLoS One. 2015 Dec 30;10(12):e0146079. doi: 10.1371/journal.pone.0146079. eCollection 2015.
When modelling the emergence of weeds, two main factors are considered that condition this process: temperature and soil moisture. Optimum temperature is necessary for metabolic processes that generate energy for growth, while turgor pressure is necessary for root and shoot elongation which eventually leads to seedling emergence from the soil. Most emergence models do not usually consider light as a residual factor, but it could have an important role as it can alter directly or indirectly the dormancy and germination of seeds. In this paper, inclusion of light as an additional factor to photoperiod and radiation in emergence models is explored and compared with the classical hydrothermal time (HTT) model using Camelina microcarpa as an example. HTT based on hourly estimates is also compared with that based on daily estimates. Results suggest that, although HTT based models are accurate enough for local applications, the precision of these models is improved when HTT is estimated hourly and solar radiation is included as a factor.
在对杂草的出苗过程进行建模时，会考虑影响这一过程的两个主要因素：温度和土壤湿度。生长所需的代谢过程需要适宜的温度来产生能量，而根和茎的伸长需要膨压，这最终导致幼苗出土。大多数出苗模型通常不将光照视为一个残余因素，但光照可能具有重要作用，因为它可以直接或间接地改变种子的休眠和萌发。本文以小果亚麻荠为例，探讨了在出苗模型中加入光照作为光周期和辐射之外的另一个因素，并与经典的水热时间（HTT）模型进行比较。还比较了基于每小时估算的HTT模型和基于每日估算的HTT模型。结果表明，尽管基于HTT的模型对于局部应用来说足够准确，但当每小时估算HTT并将太阳辐射作为一个因素纳入时，这些模型的精度会得到提高。
