不同草种单播草坪蒸散量的研究

A study on the ET of different turf-grass species

对草地早熟禾、多年生黑麦草、高羊茅、狗牙根、结缕草和野牛草6种常见草坪草草坪的蒸散量进行了研究,发现在充分灌水的条件下,冷地型草坪的蒸散量显著大于暖地型草坪(P<0.01);3种冷地型草坪间差异较小;暖地型草坪中狗牙根和结缕草的蒸散量显著高于野牛草(P<0.01)。限制灌水条件下,6种草坪的蒸散量差异均显著(P<0.05或0.01),其顺序为:高羊茅>早熟禾>黑麦草>狗牙根>结缕草>野牛草。通过充分灌水和限制灌水2个处理确定了6种草坪的年需水量范围。在不同水分梯度下,高羊茅的蒸散量随土壤含水量的减少而减少;狗牙根的蒸散量随土壤含水量的减少呈现降低的趋势。高羊茅和狗牙根蒸散量在一天内随温度的升高而增加,但温度维持在较高时由于气孔关闭导致蒸腾降低从而蒸散量降低。

The ET of six different turf-grass species in Beijing was studied.Theresult showed that ET was significantly higher in cool-season turf-grass than in warm-season turf-grass under sufficent irrigation(P<(0.01)).Among three cool-season turf-grass,ET difference was not significant (P<0.01).The ET of Cynodon dactylon cv Sun city and Zoysica sinica was higher significantly than that of Buchloe dactyloides (P<0.01) in the warm-season turf-grass,Under the condition of limit irrigation,the difference between six turf-grass species was significant(P<0.05 or P<0.01).The order of ET was Festuca arundinacea cv Pixie>Poa Pratensis cv Midnight>Lolium Perenne cv Pickwick>Cynodon dactylon cv Sun city>Zoysica sinica>Buchloe dactyloides.Under different soil water content grades,the ET of Festuca arundinacea and Cynodon dactylon cv Sun city drop with the decrease of soil water conservation.ET of Festuca arundinacea and Cynodon dactylon cv Sun city increased with the rise of temperature.