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首页> 外文期刊>Crop & Pasture Science >Development of a thermal-time model for combinational dormancy release of hairy vetch (Vicia villosa ssp villosa)
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Development of a thermal-time model for combinational dormancy release of hairy vetch (Vicia villosa ssp villosa)

机译：开发一种热时模型，用于组合休眠释放有毛etch子（Vicia villosa ssp villosa）

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摘要

Seed dormancy could be a factor related to natural reseeding of hairy vetch (Vicia villosa ssp. villosa Roth.), a winter annual species cultivated for seed, pasture, hay, green manure and cover crop. The presence of combinational dormancy (physical dormancy + physiological dormancy, PY + PD) in hairy vetch was explored by a model using laboratory and field measures. At the stage of natural dispersal, dry seeds of hairy vetch were stored under laboratory conditions at 5, 10, 20 and 30 degrees C (+/-2 degrees C) or buried at 5 cm depth in an experimental field. Germination at 5, 8, 10, 15, 20 and 25 degrees C was assessed at regular intervals up to 295 days after harvest. Following the hypothesis of the existence of a combinational dormancy mechanism, model development was based on the estimation of: (i) the fraction of non-PY seed as a function of after-ripening thermal-time accumulation, and (ii) seed population thermal parameters associated with a given level of PD. The developed model adequately described the after-ripening thermal-time requirements for PY + PD release of V. villosa. Based on model predictions, under a semi-arid thermal regime, >45% of vetch seeds shed during the summer season would be able to germinate during early autumn. Thus, the seed-bank size threshold at the end of the first growing season should be >65 seeds m(-2) in order to reach a minimum stand of 30 plants m(-2) necessary for a productive pasture
机译：种子休眠可能是与毛v子（野豌豆（Vicia villosa ssp。villosa Roth。），一种用于种子，牧场，干草，绿肥和覆盖作物的冬季年度物种）的自然再播种有关的因素。通过使用实验室和田间措施的模型探索了毛v子中组合休眠（物理休眠+生理休眠，PY + PD）的存在。在自然分散的阶段，将多毛紫菜的干燥种子在实验室条件下储存在5、10、20和30摄氏度（+/- 2摄氏度）下，或埋在5 cm深度的实验田中。在收获后最多295天，定期进行5、8、10、15、20和25摄氏度的发芽评估。根据存在组合休眠机制的假设，模型开发基于以下估计：（i）非PY种子的比例与成熟后热时间积累的函数，以及（ii）种子种群热与给定的PD水平相关的参数。所开发的模型充分描述了绒毛葡萄球菌PY + PD释放后成熟的热时间要求。根据模型预测，在半干旱热条件下，夏季收获的v子种子中> 45％能够在初秋发芽。因此，在第一个生长季节结束时，种子库的大小阈值应大于65种子m（-2），以便达到生产牧场所需的至少30株m（-2）的苗木。

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