草地早熟禾品种间生理有效水阈值和耐旱性的比较研究

发布时间：2018-05-12 19:53

本文选题：草地早熟禾 + 生理有效水阈值　；参考：《内蒙古农业大学》2015年硕士论文

【摘要】：近些年,水资源的匮乏成为了当前乃至将来普遍性存在的问题,并且在很多城市,草坪的灌溉没有规划,管理也相对粗放,造成大量水资源浪费。因此,了解草坪的需水量和需水规律及其他的节水方法显得十分重要。本文通过摸清草地早熟禾草坪草生理需水阈值,以期揭示草地早熟禾草坪合理需水机理,同时找出较为耐旱品种,为半干旱地区城市草坪制定高效合理的精准节水灌溉制度提供可靠的理论依据。本文研究了草地早熟禾(Poa pratensis L.)4个品种(凯蒂、凯兰德、爱娃和优异)萎蔫后分4个梯度(分别为田间持水量的100%、80%、60%和40%)复水的过程,从2014年4月开始测定和观察了田间持水量、土壤绝干含水量、地上生物量、地下生物量、萎蔫系数以及草坪草恢复景观和维持景观的时间,比较地上生物量、地下生物量等指标在100%的灌溉梯度下与其他条件下的区别,找到草地早熟禾草坪草生理需水闽值；并利用综合评价方法对控水之后的各指标进行分析,以期找到较为抗旱的品种,研究结果表明：(1)草地早熟禾有效生理水的上限为田间持水量的80%,各品种之间无明显不同。(2)草地早熟禾品种凯蒂、凯兰德、爱娃和优异的生理有效水的下限分别为54.84 g/kg、54.24 g/kg、54.2 g/kg.67.54 g/kg,介于田间持水量的16.5%和20.6%之间。(3)4个品种抗旱性由强到弱排序为凯兰德优异爱娃凯蒂,其中最抗旱的品种是凯兰德。
[Abstract]:In recent years, the scarcity of water resources has become a common problem at present and even in the future, and in many cities, irrigation of lawn is not planned, management is relatively extensive, resulting in a large number of waste of water resources. Therefore, it is very important to understand the water demand and law of lawn and other water saving methods. In this paper, the physiological threshold of water demand of Kentucky bluegrass was investigated in order to reveal the reasonable mechanism of water demand and to find out the drought-tolerant varieties. It provides a reliable theoretical basis for the establishment of efficient and reasonable precision water-saving irrigation system for urban lawn in semi-arid area. In this paper, the process of rehydration of four varieties of POA pratensis L. (Cathy, Kelland, Eva and excellent) was studied, which was divided into four gradients (100% and 40% of field water holding capacity, respectively) after wilting. The field water capacity was measured and observed from April 2014. Soil dry water content, aboveground biomass, underground biomass, wilting coefficient and the time of landscape restoration and maintenance of turf grass were compared between the above ground biomass and underground biomass under 100% irrigation gradient compared with other conditions. The physiological water threshold of Kentucky bluegrass was found and the indexes after water control were analyzed by comprehensive evaluation method in order to find the drought-resistant varieties. The results showed that the upper limit of available physiological water of POA pratensis was 80% of field water holding capacity, and there was no obvious difference among varieties. The lower limits of Ava and excellent physiological available water were 54.84 g / kg / kg and 54.24 g / kg 路kg ~ (2) g/kg.67.54 / kg, respectively. The drought resistance of the four varieties ranged from strong to weak to Kelander's. The most drought-resistant variety was Kelland, which was between 16.5% and 20.6% of the field water holding capacity.
【学位授予单位】：内蒙古农业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S688.4

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