JIA-2018-09

Journal of Integrative Agriculture 2018, 17(9): 2107–2117 RESEARCH ARTICLE Available online at www.sciencedirect.com ScienceDirect Spatial-temporal evolution of vegetation evapotranspiration in Hebei Province, China WANG Qian-feng 1, 2 , TANG Jia 1 , ZENG Jing-yu 1 , QU Yan-ping 2 , ZHANG Qing 3 , SHUI Wei 1 , WANG Wu- lin 1 , YI Lin 4 , LENG Song 5 1 Fujian Provincial Key Laboratory of Remote Sensing of Soil Erosion and Disaster Protection/College of Environment and Resources, Fuzhou University, Fuzhou 350116, P.R.China 2 Research Center on Flood and Drought Disaster Reduction, China Institute of Water Resources and Hydropower Research, Beijing 100038, P.R.China 3 Key Laboratory of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Science, Beijing 100094, P.R.China 4 Geospatial Information Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, P.R.China 5 Climate Change Cluster, University of Technology Sydney, New South Wales 2007, Australia Abstract Evapotranspiration (ET) is the sum of soil or water body evaporation and plant transpiration from the earth surface and ocean to the atmosphere, and thus plays a significant role in regulating carbon and water resource cycles. The time-series data set from the remote sensing MOIDS product (MOD16) was used to study the spatial-temporal evolution of vegetation evapotranspiration in salinized areas during 2000–2014 by analyzing the variability, spatial patterns and Mann-Kendall (MK) nonparametric trends for the time series. The results indicate that inter-annual and intra-annual variations of ET across various vegetated areas show seasonal changes, with the abnormal months identified. The cultivated land displays a greater degree of spatial heterogeneity and the spatial pattern of ET in the area covered by broadleaved deciduous forests corresponds to a higher ET rate and increased water consumption. Awidespread decline of ET is observed only in cultivated areas. However, agricultural cultivation doesn’t worsen water shortage and soil salinization problems in the region, and water shortage problems are worsening for other vegetated areas. This research provides a basis of reference for the reasonable allocation of water resources and restructuring of vegetation patterns in salinized areas. Keywords: evapotranspiration, Hebei Province, MODIS, spatial pattern, vegetation, spatial-temporal evolution 1. Introduction The biosphere, as the intermediate zone of life on the earth between the lithosphere and the atmosphere, plays a central role in earth’s material cycle and energy exchange, particularly in the regulation of carbon and water cycles (Chong et al. 1993). Evapotranspiration (ET) is an Received 27 October, 2017 Accepted 22 January, 2018 WANG Qian-feng, E-mail: wangqianfeng@fzu.edu.cn ; Correspondence QU Yan-ping, E-mail: quyp@iwhr.com © 2018 CAAS. Publishing services by Elsevier B.V. All rights reserved. doi: 10.1016/S2095-3119(17)61900-2