标题：Plastic film mulching with drip irrigation promotes maize (Zea mays L.) yield and water-use efficiency by improving photosynthetic characteristics
作者：Wang, Chuanjuan; Zhang, Yanqun; Wang, Jiandong; Xu, Di; Gong, Shihong; Wu, Zhongdong; Mo, Yan; Zhang, Yuanyuan
作者机构：[Wang, Chuanjuan; Zhang, Yanqun; Xu, Di; Gong, Shihong; Mo, Yan] China Inst Water Resources & Hydropower Res, State Key Lab Simulat & Regulat Water Cy 更多
通讯作者：Xu, D;Wang, JD
通讯作者地址：[Xu, D]China Inst Water Resources & Hydropower Res, State Key Lab Simulat & Regulat Water Cycle River, Beijing 100048, Peoples R China;[Wang, JD]Chine 更多
来源：ARCHIVES OF AGRONOMY AND SOIL SCIENCE
关键词：Mulched drip irrigation; spring maize; photosynthesis; grain yield;; water-use efficiency
摘要：It is important to reveal the physiological mechanism of water saving and yield increasing of mulched drip irrigation. Three treatments were applied at aspring maize field in Northeast China: mulched drip irrigation (MD), non-mulched drip irrigation (ND) and rain-fed practice (CK). Result showed that, MD treatment increased 5-year (2014-2018) average grain yield (GY) by 18.6% compared with the CK. The GY showed significant linear positive correlations with photosynthetic capacity (A(max)) and maximum carboxylation rate (V-cmax). The 2-year (2017-2018)mean A(max) and V-cmax of MD were significantly increased by 21.1%and 10.7%, respectively, compared with CK, and the increase was partially contributed by the descending of bundle-sheath cells to CO2 (L). The L of MD was decreased by 6.5-12.4% (P< 0.05) during the jointing and tasseling-milk stages. The relationships between A(max) and leaf nitrogen content (N-mass), and between V-cmax and N-mass, were affected by mulching treatment, which indicates that the higher leaf Nuse efficiency of the MD treatment. This study provides atheoretical basis for implementation ofmulched drip-irrigation technology,especially in Northeast China.