Physiological response of Kobresia humilis to nitrogenous fertilizer in an alpine meadow

Abstract

Abstract: Fertilization is a major measure to enhance the biomass of plants. The physiological response of Kobresia humilis to nitrogenous fertilizer in an alpine meadow was studied. The fertilization treatment significantly enhanced the activity of SOD, while there was no obvious change trend of GSH content and a “U” change of the soluble sugar content under the treatment and control. The soluble sugar content was highest in June and September, being significantly higher in the treatment than in the control for most of the time. The soluble protein content in the treatment was greater than that in the control during July and August, and less in June and September. The contents of chlorophyll a and b, and of total chlorophyll were also greater than those in the controls (except in August). The generation velocity of O₂^·- was lower in the treatment than in the control (except in July). The treatment also led to an increase in biomass, height, and coverage of the community. In conclusion, nitrogenous fertilizer treatment enhanced antioxidant capacity and osmo-adjustment, resulting in growth promotion of K. humilis.

CLC Number:

LI Yi-kang, RAN Fei, BAO Su-ke, HAN Fa, ZHOU Hua-kun, LIN Li, ZHANG Fa-wei. Physiological response of Kobresia humilis to nitrogenous fertilizer in an alpine meadow[J]. Acta Prataculturae Sinica, 2010, 19(3): 240-244.

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