The resistance to water stress of three kinds of lawns were studied by pot experiment and field experiment. The T1 lawn as control contained single species Poa pretensis, the T2 lawn consisted of P. pretensis, Festuca arundinacea and Lolium perenne with the mixed ratio of 6∶2∶2, and the T3 lawn consisted of P. pretensis, F.rubra and Agrostis tenuis with the mixed ratio of 5∶4∶1. The results were as following: along with the enhancement of water stress, the appearance quality comprehensive evaluation was in the order of T1>T2>T3. T1 had the lowest decline of soil water content, leaf relative water content and root activity, followed by T2, and then T3. The chlorophyll content in leaves followed the order of T1>T2>T3. The resistance of these lawns to water stress were T1>T2>T3. These lawns had different optimum soil water content, which the percentage of soil water content to field water capacity was 84.5%—94.8% for T1, 80.4%—91.8% for T2, and 77.5%—90.7% for T3.
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