不同水分梯度对碱茅农艺性状的影响

为了探究碱茅(Puccinellia distans)对不同水分的耐受能力及生长最适的供水量,本试验通过温室盆栽方法对碱茅进行全生育期灌溉,按照土壤田间最大持水量(Field water content,FWC)共设定6个不同水分梯度,分别为W50(50％FWC),W60(60％FWC),W70(70％FWC),W80...

Effect of Different Water Gradients on Agronomic Characters of Puccinellia distans

In order to explore the tolerance of Puccinellia distans to different water gradients and the optimum water supply for growth. According to the maximum field capacity (Field water content),Puccinellia distans in this experiment was irrigated in the whole growth period in greenhouse by six different water gradients,which were W₅₀ (50%FWC),W₆₀ (60%FWC),W₇₀ (70%FWC),W₈₀ (80%FWC),W₉₀ (90%FWC),and W₁₀₀ (100%FWC).The effects of different water gradient treatments on various agronomic characters of Puccinellia distans were observed. The results showed that， many indexes such as plant height,tiller,leaf length,leaf width,leaf area,chlorophyll content,fresh weight,dry weight and root dry weight were increased at first and then decreased with the increase of water content. As a whole,the maximum value was obtained under W₈₀ treatment,but there was no significant difference between W₈₀ treatment and W₇₀ treatment. Puccinellia distans had a large demand for water in the growing period,and it maintained normal growth with poor yield under the high water content of W₉₀ and W₁₀₀,but did not grow and develop normally under W₅₀ long-term treatment. In this experiment,it found that W₇₀ and W₈₀ were the best water supply gradients for the growth of Puccinellia distans. To a certain extent,Puccinellia distans grew poorly under the low water content,but had a high tolerance for the high water content in their whole growth period.