文献类型：期刊文献

英文题名：Evapotranspiration and its components over a rainfed spring maize cropland under plastic film on the Loess Plateau, China

作者：Gao, Xiang[1,2] Gu, Fengxue[1] Gong, Daozhi[1] Hao, Weiping[1] Chu, Jianmin[2] Li, Haoru[1]

第一作者：Gao, Xiang;高翔

通信作者：Gao, X[1];Hao, WP[1];Gao, X[2]

机构：[1]Minist Agr & Rural Affairs Peoples Republ China, Key Lab Dryland Agr, Beijing 100081, Peoples R China;[2]Chinese Acad Forestry, Key Lab Tree Breeding & Cultivat Natl Forestry &, Res Inst Forestry, Beijing 100091, Peoples R China

年份：2020

卷号：18

期号：4

起止页码：1-11

外文期刊名：SPANISH JOURNAL OF AGRICULTURAL RESEARCH

收录：;Scopus(收录号：2-s2.0-85100853661);WOS:【SCI-EXPANDED(收录号:WOS:000617035900009)】；

基金：Fundamental Research Funds for the Central Non-profit Research Institution of CAF, China CAFYBB2019SY007; Research Funding of Key Laboratory of Dryland Agriculture, China 2018KLDA01; Central Public-interest Scientific Institution Basal Research Fund, China BSRF201708

语种：英文

外文关键词：evapotranspiration partitioning; influence factors; water balance; crop coefficient and its components

摘要：Aim of study: To determine seasonal variations in evapotranspiration (ET) and its components; and ascertain the key factors controlling ET and its components in a rainfed spring maize field under plastic film. Area of study: Shouyang County in Shanxi Province on the eastern Loess Plateau, China Material and methods: Eddy covariance system combined with micro-lysimeters and meteorological observing instruments were used in the field. The manual method was used to measure the green leaf area index (GLAI) during the growing season. Main results: In 2015 and 2016, the growing season ET accounted for 80% and 79% of annual ET, respectively. Soil evaporation (E) accounted for 36% and 33% of the growing season ET in 2015 and 2016, respectively. The daily crop coefficient increased with increasing GLAI until a threshold of similar to 3 m(2) m(-2) in the canopy-increasing stage, and decreased linearly with decreasing GLAI in the canopy-decreasing stage. At equivalent GLAI, daily basal crop coefficient and soil water evaporation coefficient were generally higher in the canopy-increasing and -decreasing stages, respectively. During the growing season, the most important factor controlling daily ET, T, and E was net radiation (R-n), followed by GLAI for daily ET and T, and soil water content at 10-cm depth for daily E; during the non-growing season, daily ET was mainly controlled by R-n. Research highlights: The daily crop coefficient and its components reacted differently to GLAI in the canopy-increasing and -decreasing stages.