文献类型：期刊文献

英文题名：Water Addition Prolonged the Length of the Growing Season of the Desert ShrubNitraria tangutorumin a Temperate Desert

作者：Bao, Fang[1,2] Liu, Minghu[3] Cao, Yanli[1] Li, Jiazhu[1] Yao, Bin[1] Xin, Zhiming[3,4] Lu, Qi[1,3] Wu, Bo[1,2]

通信作者：Wu, B[1];Wu, B[2]

机构：[1]Chinese Acad Forestry, Inst Desertificat Studies, Beijing, Peoples R China;[2]Chinese Acad Forestry, Key Lab Desert Ecosyst & Global Change, Beijing, Peoples R China;[3]Chinese Acad Forestry, Expt Ctr Desert Forestry, Dengkou, Peoples R China;[4]Inner Mongolia Dengkou Desert Ecosyst Natl Observ, Dengkou, Peoples R China

年份：2020

卷号：11

外文期刊名：FRONTIERS IN PLANT SCIENCE

收录：;Scopus(收录号：2-s2.0-85089099935);WOS:【SCI-EXPANDED(收录号:WOS:000559200000001)】；

基金：This research was supported by Funds of the National Key Research and Development Project (Grant Nos. 2016YFC0500806 and 2016YFC0501004), the National Natural Science Foundation of China (Grant No. 31400421), and the Surplus Funds of Institute of Desertification Studies, CAF (Grant Nos. IDS2008JY-3 and IDS2018JY-9).

语种：英文

外文关键词：desert species; growing season; foliar phenology; branch phenology; water addition

摘要：Climate models often predict that more extreme precipitation events will occur in arid and semiarid regions, where plant phenology is particularly sensitive to precipitation changes. To understand how increases in precipitation affect plant phenology, this study conducted a manipulative field experiment in a desert ecosystem of northwest China. In this study, a long-termin situwater addition experiment was conducted in a temperate desert in northwestern China. The following five treatments were used: natural rain plus an additional 0, 25, 50, 75, and 100% of the local mean annual precipitation. A series of phenological events, including leaf unfolding (onset, 30%, 50%, and end of leaf unfolding), cessation of new branch elongation (30, 50, and 90%), and leaf coloration (80% of leaves turned yellow), of the locally dominant shrubNitraria tangutorumwere observed from 2012 to 2018. The results showed that on average, over the seven-year-study and in all treatments water addition treatments advanced the spring phenology (30% of leaf unfolding) by 1.29-3.00 days, but delayed the autumn phenology (80% of leaves turned yellow) by 1.18-11.82 days. Therefore, the length of the growing season was prolonged by 2.11-13.68 days, and autumn phenology contributed more than spring phenology. In addition, water addition treatments delayed the cessation of new branch elongation (90%) by 5.82-12.61 days, and nonlinear relationships were found between the leaves yellowing (80% of leaves) and the amount of watering. Linear relationships were found between the cessation of new branch elongation (90%), the length of the growing season, and amount of water addition. The two response patterns to water increase indicated that predictions of phenological events in the future should not be based on one trend only.