Authors : Yong Kuan Chi, Kang Ning Xiong, Pan Di Zhao, Jin Hua Zhang, Yuan Su Wang and Wen Long Zhou
Abstract: This study studies the net photosynthesis rate, transpiration rate and water-use efficiency of four forage grasses as Bromus cartharticus Vahl and Festuca elata ex E., Dactylis glomerata L. and perennial Lolium perenne L. on fine days in Bijie Salaxi Karst rocky desertification control area of Guizhou Normal University. The results showed that the average daily water use efficiency ranks: (from high to low) Festuca elatal ex. E., Bromus cartharticus Vahl, Dactylis glomerata and perennial Lolium perenne L. In detail, the average daily photosynthetic and transpiration rates of Festuca elatal ex E. are 6.234.53 (μ moL/(m2 sec)) and 6.23 (mol/(m2 sec)), respectively which belongs to high photosynthesis, high transpiration type. On the contrary, Bromus cartharticus Vahl, Dactylis glomerata L. and perennial Lolium perenne L. belong to low photosynthesis, low transpiration type. The average daily photosynthetic and transpiration rates are 4.87, 4.71, 4.53 (μmol/(m2 sec)) and 4.29, 4.42, 4.83 (mol/(m2 sec)), respectively. Net photosynthesis rate, transpiration rate and water use efficiency should be considered when researchers plant artificial pasture in Karst rocky desertification area. Meanwhile, different pasture allocation measures can not only reduce transpiration and water loss but also increase water use efficiency. These measures could ease the current situation of water shortage in Karst rocky desertification area. Both of changing the current planting situation of single sowing grass and conducting the mixture sowing between leguminous forage and herbage with high and low photosynthetic rate and transpiration rate are helpful for the diversity of biological populations in Karst rocky desertification area and improving the production potential of herbage.
Yong Kuan Chi, Kang Ning Xiong, Pan Di Zhao, Jin Hua Zhang, Yuan Su Wang and Wen Long Zhou, 2013. Analysis and Study on Photosynthetic Physiological Characteristics of 4 Grass Species in Karst Rocky Desertification Area. Journal of Animal and Veterinary Advances, 12: 1299-1306.