摘要
水分利用效率(WUE)是灌区生态环境保护和重建的重要依据。综合采用非线性最小二乘法、变异系数、相关系数、Mann-Kendall检验、Morlet小波分析和启发式分割算法等方法,研究了1985-2015年宁夏青铜峡灌区的WUE特征。结果表明:(1)灌区年均WUE为0.96 g/kg,WUE空间分布呈现出较强的空间异质性,总体呈现西高东低的特征;存在波动逐年上升趋势,WUE年际变化与ET有明显的负相关性,与TMP有明显的正相关性。(2)灌区WUE年内变化与ET、NPP、TMP和PRE均呈现正相关性,其中TMP的正相关系数更高。(3)总体来说,因为大量的生态恢复和重建工程,宁夏青铜峡灌区的生态系统的生产力有所提高,在一定程度上改善了灌区的生态状况,未来灌区生态系统的WUE会持续上升。
Water use efficiency(WUE)is an important basis for ecological environment protection and reconstruction in irrigated areas.In this paper,nonlinear least squares,coefficient of variation,correlation coefficient,Mann-Kendall test,Morlet wavelet analysis and heuris⁃tic segmentation algorithm are used to study the characteristics of WUE in Qingtongxia Irrigation District of Ningxia from 1985 to 2015.The results are as follows:①The average annual WUE in the irrigated area is 0.96 g/kg,and the spatial distribution of WUE show strong spatial heterogeneity,with the characteristics of high in the west and low in the east.There is an increasing trend of fluctuation year by year,and the interannual variation of WUE has an obvious negative correlation with ET,and a significant positive correlation with TMP.②The annual variation of WUE in the irrigation area is positively correlated with ET,NPP,TMP and PRE,and the positive correlation coefficient of TMP is higher.③In general,due to a large number of ecological restoration and reconstruction projects in Qingtongxia Irrigated Area of Ningxia,the productivity of the ecosystem in the irrigated area has been improved,and the ecological status of the irrigated area has been improved to some extent.In the future,the WUE of the ecosystem in the irrigated area will continue to rise.
作者
李宇扬
王红雨
LI Yu-yang;WANG Hong-yu(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,Ningxia,China;Engineering Technology Research Center of Water-Saving and Water Resource Regulation in Ningxia,Yinchuan 750021,Ningxia,China;Engineering Research Center for Efficient Utilization of Modern Agricultural Water Resources in Arid Regions,Ministry of Education,Yinchuan 750021,Ningxia,China)
出处
《中国农村水利水电》
北大核心
2024年第1期62-69,共8页
China Rural Water and Hydropower
基金
宁夏自然科学基金重点项目(2021AAC02006)
宁夏自然科学基金(2021AAC03021)。
关键词
遥感数据
水分利用效率
时空变化
特征分析
remote sensing
water use efficiency
temporal and spatial variation
analysis of features
