Photosynthetic gas exchange and water utilization of flag leaf of spring wheat with bunch sowing and field plastic mulching below soil on semi-arid rain-fed area.

• Published in: Ying yong sheng tai xue bao Vol. 27; no. 7; p. 2264
• Main Authors: Yang, Wen Xiong, Liu, Na, Liu, Xiao Hua, Zhang, Xue Ting, Wang, Shi Hong, Yuan, Jun Xiu, Zhang, Xu Cheng
• Format: Journal Article
• Language: Chinese
• Published: China 01.07.2016
• Subjects: Agriculture - methods; Chlorophyll; Droughts; Photosynthesis; Photosystem II Protein Complex; Plant Leaves; Plant Transpiration; Plastics; Rain; Seasons; Soil; Triticum - physiology; Water - physiology; water use efficiency; spring wheat; whole field soil-plastic mulching and bunch sowing; chlorophyll fluorescence parameter; rain-fed semi-arid area; photosynthetic gas exchange
• ISSN: 1001-9332
• DOI: 10.13287/j.1001-9332.201607.033

Based on the field experiment which was conducted in Dingxi County of Gansu Province, and involved in the three treatments: (1) plastic mulching on entire land with soil coverage and bunching (PMS), (2) plastic mulching on entire land and bunching (PM), and (3) direct bunching without mulching (CK). The parameters of SPAD values, chlorophyll fluorescence parameters, photosynthetic gas exchange parameters, as well as leaf area index (LAI), yield, evapotranspiration, and water use efficiency in flag leaves of spring wheat were recorded and analyzed from 2012 to 2013 continuously. The results showed that SPAD values of wheat flag leaves increased in PMS by 10.0%-21.5% and 3.2%-21.6% compared to PM and CK in post-flowering stage, respectively. The maximum photochemical efficiency (F /F ) , actual photochemical efficiency (Φ ) of photosystem 2 (PS2), and photochemical quenching coefficient (q ) of PMS were higher than those of PM and CK, the maximum increment values were 6.1%, 9.6% and 30.9% as compared with PM, a