生态学报2024，Vol.44Issue(11)：4782-4794,13.DOI:10.20103/j.stxb.202309232068
宁夏沿黄绿洲参考作物蒸散演变特征及其归因
Change characteristics of reference crop evapotranspiration of the Yellow River Oasis in Ningxia autonomous region and its driving analysis
摘要
Abstract
Reference crop evapotranspiration(ET0)is a key factor in eco-hydrological processes.The study of ET0 evolution in arid oasis areas not only helps us to understand the response of hydrological processes of oasis in the context of climate change but also has a guiding significance for the efficient allocation of soil and water resources in oasis and the maintenance of ecosystem stability.In this paper,we took the Yellow River Oasis in Ningxia autonomous region as an example,calculated ET0 based on meteorological data from 1960 to 2019 and the Penman-Monteith model,and used the Mann-Kendall test,relative sensitivity coefficients,and Morlet wavelet analysis to study the characteristics of ET0 evolution and its driving mechanism in the oasis over the past 60 years.The results showed that:(1)ET0 of the Yellow River Oasis in Ningxia presented a single peak pattern within a year.The ET0 was higher from May to July and its accumulated value accounted for 43.6%of the total annual ET0.The annual ET0 from 1960 to 2019 was 1226.38 mm and increased with an amplitude of 1.66 mm/a(P＜0.01).However,the fluctuation characteristics of interannual ET0 were significant in that the ET0 had no trend before the mutation year of 1988 while it increased or decreased significantly with a cycle of about every decade after that.(2)The annual ET0 mainly oscillated with cycles of 20-40 and 50-60 years,while its cycles overlapped complicatedly in multiple time scales.Furthermore,the cycle and magnitude of oscillation in different seasons varied greatly.The oscillation cycles in summer and autumn were close to that of the annual,but the oscillation magnitude was stronger than that in winter and spring.(3)Although there were significant correlations between ET0 and the six meteorological factors used to calculate ET0,the sensitivity of ET0 to different meteorological factors varied.The sensitivity of ET0 on maximum temperature and relative humidity was higher,and the coefficients were 11.58%and 8.40%.(4)There was a strong coupling between ET0 and the regional climatic changes of the Yellow River Oasis in Ningxia.air temperature sustained warming,relative humidity sustained decreasing,and their aerodynamic coupling result in vapor pressure deficit increasing were critical to promote the enhancement of ET0.Meanwhile,the mutation of regional climate from wet to dry and the abnormal fluctuation of average wind speed were the reasons to induce the abrupt change of ET0.关键词
沿黄绿洲/蒸散发/敏感系数/小波分析/参考作物蒸散Key words
Yellow River Oasis/evapotranspiration/sensitivity coefficient/wavelet analysis/reference crop evapotranspiration引用本文复制引用
罗霄,杜灵通,乔成龙,马龙龙,吴宏玥,钟艳霞,潘海珠..宁夏沿黄绿洲参考作物蒸散演变特征及其归因[J].生态学报,2024,44(11):4782-4794,13.基金项目
宁夏重点研发计划(2021BEG02010,2022BEG02051) （2021BEG02010,2022BEG02051）
