关键词: 狼尾草, 狼尾草, 净光合速率, 蒸腾速率, 光响应曲线, 光能利用效率, 水分利用效率

Abstract: In order to rational application of boron fertilizer, available boron contents in 22 soil samples collected from different land utilization modals in Tonglu County were determined in 2010, and compared with the soil available boron contents of corresponding points in 1983. The results showed that: soil available boron contents in this County in 2010 ranged 0.20-0.97 mg/kg, the average value was 0.50 mg/kg, the average content of available boron in 8 garden soil samples was 0.61 mg/kg, the average content of available boron in 14 paddy soil samples was 0.44 mg/kg. The available boron contents in the soils in 2010 decreased in the following order: Orchard (0.82 mg/kg)>tea gardens (0.68 mg/kg)>mulberry gardens (0.47 mg/kg)>rice-vegetable cropping system (0.45 mg/kg) rice-rape cropping system (0.41 mg/kg). In the latest 30 years, the available boron contents in the soils had greatly improved and the soil samples with <0.25 mg/kg of available boron content decreased from 90.8% in 1983 to 13.6% in 2010; the soil samples with 0.25-0.50 mg/kg of available boron content increased from 4.6% in 1983 to 31.8% in 2010; the soil samples with 0.50-1.00 mg/kg of available boron content increased from 4.6% in 1983 to 54.6% in 2010. Accordingly, the author put forward the countermeasure of application of boron fertilizers.