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农林牧三者并存的半干旱地区,在造林种草和粮食生产中,干旱是影响成苗的重要外界因素,因此从理论和实践方面都有必要对逆境成苗生理生态基础加以研究,为旱地农业增产探索新途径。一、逆境成苗的生理生态基础 1.水分亏缺对种子萌发、成苗过程的影响在干旱、半干旱地区,大多数作物和牧草在种子萌发和成苗过程中经常受到土壤水分亏缺的影响使萌发率下降,成苗时间延长,形成小苗、弱苗。土壤干旱使幼苗叶肉细胞光合能力下降,呼吸增强,叶温升高,加剧幼叶蒸腾失水是形成弱小苗的主要原因。
In the semi-arid areas where the forestry, forestry and animal husbandry coexist, in the afforestation, planting and grain production, the drought is an important external factor that affects the seedling emergence. Therefore, it is necessary to study the eco-ecological basis of adversity seedling in both theory and practice. Exploring new ways to increase agricultural output. First, the adversity of the physiological and ecological basis for seedlings 1. Water deficit on the seed germination, seedling process in the arid and semi-arid regions, most of the crops and pastures in the seed germination and seedling process often suffer from soil water deficit Affect the germination rate decreased seedling time, the formation of seedlings, weak seedlings. Soil drought caused the decrease of photosynthetic capacity, increased respiration, increased leaf temperature and increased transpiration of young leaves, which was the main reason for the formation of weak seedlings.