Abstract: Through tests and measurements, this paper analyzed the relationships between the leaf area and mowing characteristic of golf course turfs in North China, and further, established a relational model of turf leaf area index with different mowing height. There was a positive relationship between the leaf area index and the mowing height, and the blade width had greater effects on the leaf area index. Taking a golf course in Tianjin City as the case, a survey was made on the turf green quantity in its different components, and the ecological benefits of the golf course were calculated, based on the daily transpiration, O₂ release and CO₂ intake, and heat absorption per unit area Kentucky bluegrass. The annual transpiration of the golf course was 88119744.59 mol, annual O₂ release and CO₂ intake were 7830.67 t and 10771.66 t, respectively, and annual heat absorption for transpiration was 6903753.43 GJ. The economic benefits of the golf course estimated by environmental benefit evaluation method were 1102.59 ten thousand yuan for annual CO₂ intake, 313.23 ten thousand yuan for annual O₂ discharge, and 126760.58 ten thousand yuan for annual heat absorption for transpiration, with the total ecological value being 128176.95 ten thousand yuan.

Key words: Rare earth elements, Earthworm, Amino acid