不同土壤含水量对草地早熟禾出苗及根系的影响

Effects of different soil moistures on emergence and root of Kentucky bluegrass

研究了不同土壤含水量对草地早熟禾品种优异（Poa pratensis cv．Merit）种子萌发以及幼苗生长的影响。共设置5个水分梯度，分别为田间最大持水量的70％（FWC70）、60％（FWC60）、50％（FWC50）、40％（FW40C）和30％（FWC30），通过测定出苗率、苗长、根长、幼苗鲜质量、根鲜质量、根系总表面积、根系平均直径、根系总长及侧根数指标，探讨土壤水分条件对“优异”种子萌发以及幼苗生长的影响。结果表明，当土壤含水量为田间持水量的60％时，草地早熟禾的出苗率、苗长、根长、幼苗鲜质量、根系总表面积、根系平均直径、根系总长及侧根数都达到最大值，而田间最大持水量的70％和50％水分梯度条件下效果相同。因此，从节约用水的角度考虑，建议建植草地早熟禾草坪时应保持土壤的含水量为田间持水量的50％～60％。

It is important to understand the turfgrass growth characteristics under different soil water con- tents for developing a sustainable strategy for turf management. The objective of this study is to investigate the growth characteristics at seedling stage of Kentucky bluegrass （Poa pratensis cv. Merit） under a range of soil water contents. The growth chamber experiment consisted of five soil water content treatments （70% ,60% ,50% ,40% and 30% of filed water content）. The seedling emergence rate had significant positive relationship with soil water content and it increased with the increasing of soil water content. The trend of the length and weight of fresh seeds were FWC60〉FWC70〉FWCS0〉FW40C〉FWC30, and the root length and fresh weight ,total surface areas of roots, average root diameter, total length of roots and number of tips were FWC60〉FWC50〉FWC70〉FW40C〉FWC30. The results indicated that FWC70 and FWC30 treatments were unfavorable to sustainable development of turfgrass. FWC 50 to 60 could be used as an ideal soil water level for Kentucky bluegrass growth.