水分对3种冷季型草坪草生长的影响及蒸散需水研究——3种冷季型草坪草地上部分对不同水分梯度的响应

Effects of moisture on the growth and evapotranspiration of three cold-season turfgrass The aboveground biomass and turfgrass quality of three cold-season turfgrass responded to diverse soil water gradients

对多年生黑麦草Lolium perenne,草地早熟禾Poa pratensis和苇状羊茅Festuca arundinacea 3种冷季型草坪草生长季内在田间持水量(FC)30%～50%,50%～70%,70%～90% 3个水分梯度下的地上生物量、再生速度及其坪用质量进行了田间测定.结果表明:3种草坪草在FC 30%～50%下的再生速度与50%～70%下的再生速度具有显著性差异,当FC 50%～70%时,再增加水分并不能显著增强草坪草的再生速率.多年生黑麦草、草地早熟禾、苇状羊茅整个试验期间的地上生物量干物质累积在FC 30%～50%,50%～70%之间差异显著,FC 50%～70%与70%～90%下的地上生物量累积差异不明显.3种草坪草叶片组织含水量随着水分梯度的增加而增大,叶片组织含水量对水分梯度的响应基本显著.方差分析结果表明,3种冷季型草坪草在不同的水分梯度下,其坪用质量具有差异显著性(P＜0.05),灌水能显著提高草坪草的质量.但在FC 50%～70%的水分梯度下,3种冷季型草坪草都表现理想(得分＞6.5).

Aboveground biomass, regeneration rate and turfgrass quality of perennial ryegrass, Kentucky bluegrass and tall rescue under different soil moisture gradients of 30%-50% field water capacity （FC）,FC 50%-70% and FC 70%-90% in the whole experimental period was measured under field conditions. The results showed that the difference of regenerate rate and aboveground biomass accumulation of the three coldseason turfgrass under the soil moisture gradient between FC 30%-50% and FC 50%-70% was remarkable. When the soil moisture gradient was FC 50~70~, the regenerate rate and aboveground biomass accumulation of the three kinds of col＆season turfgrass couldn＇t increase observably along with the enhance of soil moisture gradient. The higher the irrigation quota, the higher water content of stem and leaf tissue, which responded markedly to soil water gradient. ANOVA analysis showed that turfgrass quality was influenced rerruarkably by the water gradient. But when soil moisture was about FC 50%-70%, turfgrass quality of the three species was all ideal （scote〉6. 5）.