ABSTRACT

Long-term monitoring of the extent and intensity of irrigation systems is needed to track crop water consumption and to adapt land use to a changing climate. We mapped the expansion and changes in the intensity of irrigated dry season cropping in Turkey´s Southeastern Anatolia Project annually from 1990 to 2018 using Landsat time series. Irrigated dry season cropping covered 5,779 km² (± 479 km²) in 2018, which represents an increase of 617% over the study period. Dry season cropping was practiced on average every second year, but spatial variability was pronounced. Increases in dry season cropping frequency were observed on 40% of the studied croplands. The presented maps enable the identification of land use intensity hotspots at 30 m spatial resolution, and can thus aid in assessments of water consumption and environmental degradation. All maps are openly available for further use at https://doi.org/10.5281/zenodo.4287661.

摘要

需要对灌溉系统的范围和强度进行长期监测，以追踪农作物的用水量并使土地利用适应气候变化。我们使用Landsat时间序列绘制了1990年至2018年土耳其东南安纳托利亚项目每年旱季灌溉量的扩展和强度变化图。2018年的旱季灌溉面积为5779平方公里（±479平方公里），在研究期间增长了617％。平均每两年进行一次旱季作物种植，但空间变异性明显。在研究的40％的耕地中，干旱季节的耕种频率有所增加。所提供的地图可以识别30 m空间分辨率的土地利用强度热点，因此可以帮助评估耗水量和环境退化。