拂子茅和早熟禾的灌溉比较研究  

Comparison of Irrigation for Calamagrostis Brachytricha and Poa Pratensis

作　　者：孙璐[1] 袁小环[2] 武菊英[2] 王建中[1] 

机构地区：[1]北京林业大学,北京100083 [2]北京草业与环境研究发展中心,北京100089

出　　处：《节水灌溉》2006年第5期11-14,共4页Water Saving Irrigation

基　　金：北京市科学技术委员会重大项目"北京城市园林绿地水分经济生态的研究与示范"(D0605001040291)资助

摘　　要：利用土壤水势作为灌溉指标,设置-30、-40、-50、-60 kPa 4个水势梯度,比较研究抗旱观赏草拂子茅和冷季型草坪草早熟禾在9月、10月的灌溉规律。拂子茅在土壤水势-30^-60 kPa时进行灌溉生长差异不显著,9、10两月的总灌溉量最低可达74.9 mm;早熟禾适宜在土壤水势达到-30 kPa时进行灌溉,9、10月的总灌溉量为161.7 mm,低于-30 kPa的土壤水势下生长受影响。拂子茅和早熟禾的叶片水势都随土壤水势的下降而下降,拂子茅的下降速度低于早熟禾,具有较高的叶片水势,而拂子茅在-60 kPa的土壤水势处理下根冠比显著升高,说明拂子茅在干旱胁迫下具备较强的吸水和保水能力。Taking soil water potential as irrigation index, setting four soil water potential grads as -30,-40,-50,-60 kPa , the irrigation rule of drought-resistant ornamental grass, i.e. Calamagrostis brachytricha, and cool-season turf grass, i.e. Poa praten sis, from September to October was compared. Calamagrostis brachytricha grew well under the soil water potentials from -30 kPa to -60 kPa, and its lowest total irrigation amount during the two months was 74. 9nm. Poa pratensis was suitable to irrigation un der soil water potential of -30 kPa, and its total irrigation amount was 161.7 mm. It will grow bad under the soil water potentials of lower than 30kPa. I.eaf water potential of Calamagrostis brachytricha and Poa pratensis decreased with the decrease of soil water potential, while the decrease velocity of Calamagrostis brachytricha was slower than that of Poa pratensis, and Calamagrostis brachytricha had higher leaf water potential. Meanwhile, the ratio of root to shoot of Calamagrostis brachytricha increased clearly under the soil water potential of -60 kPa, this indicated that it had stronger ability to resist drought.

关 键 词：拂子茅 早熟禾 土壤水势 灌溉 

分 类 号：S274[农业科学—农业水土工程] S688.4[农业科学—农业工程]