David Helman | Helman | David | investigate | main factors | affecting

List of Publications

Submitted to review

Mulero G*, Bonfil DJ, Helman David. Where does the carbon go? Elevated CO2 amplifies photosynthesis under high nitrogen but not yield in dryland Mediterranean wheat. Submitted.
Mulero G*, Bonfil DJ, Lerner G**, Tamata E*, Egorov F*, Harris Y*, Michael Y*, Usenko D*, Helman David. WheatDryFACE: Design, performance, and insights from a multifaceted Mediterranean dryland wheat free-air carbon dioxide enrichment (FACE) platform. Submitted.
Helman David. Croplands as thermodynamic agents in a high-CO2 world. Submitted.
Helman David, Gabriel Mulero*, Emmanuel Tamata*. Elevated CO2 increases leaf temperature independently of stomatal regulation. Submitted.
Helman David, Tau G, Michael Y*, Lensky N. Restored but still emitting: High CO2 fluxes from a Mediterranean wetland challenge inundation-based restoration strategies. Submitted.
Shlomi E, Helman David, Glikman O. From hyperspectral discovery to multispectral deployment: End-to-end differentiable band selection for tomato quality prediction. Submitted.

* Lab's student ** Lab's manager or assistant

Published (& accepted) articles

2026

Usenko D*, Giladi C, Ziv C, Helman David (2026). Effects of leaf removal on photosynthetic activity, fruit yield, and quality of micro-dwarf tomatoes. Horticulturae, 12, 792, 2–16.
Egorov F*, Michael Y*, Helman David (2026). Functional diversity among crop models reveals contrasting resilience of soybean and maize to heatwaves and CO₂ enrichment. Field Crops Research, (345) 110547.
Yungstein Y* and Helman David (2026). VertINGreen: A practical application for planning and monitoring indoor vertical green living walls based on remote sensing and machine learning models. Indoor Air, (1) 5782002.

2025

Yungstein Y*, Fishman N*, Lerner G**, Mulero G*, Michael Y*, Yaakobi A, Obersteiner S, Rez L, Klein T, Helman David (2025). Early detection of drought-stressed stands in Mediterranean forests using remote sensing and machine learning classification models in a rainfall exclusion experiment. Agricultural and Forest Meteorology, (375) 110855.
Mulero G*, Bonfil David J, Helman David. (2025) Wheat leaf area index retrieval from drone-derived hyperspectral and LiDAR imagery using machine learning algorithms. Agricultural and Forest Meteorology, (372) 110648.
Usenko D*, Helman David, Giladi C. (2025) Using 3D reconstruction from image motion to predict total leaf area in dwarf tomato plants. Computers and Electronics in Agriculture, (237) 110627.
Wang G, Xue B, Knauer J, Helman David, Tao S, Luo Y, Wang J, Yinglan A, Wang Y, Jin H, Fang Q, Wang Q, Xiao J. (2025) No widespread decline in canopy conductance under elevated atmospheric CO2. Agricultural and Forest Meteorology, (371) 110649.

2024

Fishman N* , Yungstein Y* , Yaakobi A, Obersteiner S, Rez L, Mulero G* , Michael Y** , Klein T, Helman David. (2024) Leaf water potential in a mixed Mediterranean forest from machine learning and unmanned aerial vehicle (UAV)-based hyperspectral imaging. Remote Sensing, 17(1), 106.
Fass E*, Shlomi E, Ziv C, Glikman O, Helman David. (2025) Machine learning models based on hyperspectral imaging for pre-harvest tomato fruit quality monitoring. Computers and Electronics in Agriculture, 229, 109788.

2023

Burstein O*, Grodek T, Enzel Y, Helman David. (2023) SatVITS-Flood: Satellite Vegetation Index Time Series Flood detection model for hyperarid regions. Water Resources Research, 59, e2023WR035164.
Yungstein Y* and Helman David. (2023) Cooling, CO2 reduction, and energy-saving benefits of a green-living wall in an actual workplace. Building and Environment, 236, 110220.
Mulero G*, Jiang D*, Bonfil DJ, Helman David. (2023) Use of thermal imaging and the Photochemical Reflectance Index (PRI) to detect wheat response to elevated CO2 and drought. Plant, Cell & Environment, 46 (1), 76-92.
Azar M, Mulero G*, Oppenheimer-Shaanan Y, Helman David, Klein T. (2023) Aboveground responses to belowground root-system mechanical damage detected by non-destructive sensing metrics in three Mediterranean tree species. Forestry: An International Journal of Forest Research.
Hipsch M, Michael Y**, Lampl N, Sapir O, Cohen Y, Helman David, and Rosenwasser S. (2023) Early detection of late blight in potato by whole-plant redox imaging. The Plant Journal., 113 (4), 649-664.
Ott Richard, Gallen Sean, Helman David. (2023) Denudation partitioning in carbonate regions reveal climatic and tectonic drivers of carbonate landscape evolution. Earth Surface Dynamics., 11 (2), 247–257.
Xie X., Hao M., Ding F., Ide T., Helman David, Scheffran J., Wang Q., Qian Y., Chen S., Wu J., Ma T., Ge Q., Jiang D. (2023) Exploring the worldwide impact of COVID-19 on conflict risk under climate change. Heliyon.
Jiang D, Wu J, Ding F, Ide T, Scheffran J, Helman David, Zhang S, Qian Y, Fu J, Chen S, Xie X, Ma T, Hao M, Ge Q. (2023). An integrated deep-learning and multi-level framework for understanding the behavior of terrorist groups. Heliyon.

2022

Jiang D*, Mulero G*, Bonfil JD, Helman David. (2022) Early or late? The role of genotype phenology in determining wheat response to drought under future high atmospheric CO2 levels. Plant, Cell & Environment, 45 (12), 3445–3461.
Helman David and Bonfil DJ. (2022) Six decades of warming and drought in the world’s top wheat-producing countries offset the benefits of rising CO2 to yield. Scientific Reports (Nature Group), 12 (1), 1-10.
Helman David, Yungstein Y*, Mulero G*, Michael Y** (2022) High-Throughput Remote Sensing of Vertical Green-Living Walls (VGW) in Workplaces. Remote Sensing, 14(14), 3485; https://doi.org/10.3390/rs14143485.
Xie X, Hao M, Ding F, Helman David, Scheffran J, Jiang D. (2022) Exploring the direct and indirect impacts of climate variability on armed conflict in South Asia. iScience, 25(11), 105258.
Grünzweig J., De Boeck H., Rey A., Santos M., Adam O., Bahn M., Belnap J., Deckmyn G., Dekker S., Flores O., Gliksman D., Helman David, Hultine K., Liu L., Meron E., Michael Y., Sheffer E., Throop H., Tzuk O., Yakir D (2022). Dryland mechanisms could widely control ecosystem functioning in a drier and warmer world. Nature Ecology & Evolution, 6, 1064-1076.
Ge Q., Hao M., Ding F., Jiang D., Scheffran J., Helman David, Ide T. (2022). Modelling armed conflict risk under climate change with machine learning and high-frequency time-series data. Nature Communications, 13, 2839.
Xue B., Xiao J., Wang G., Helman David, Sun G., Tao S., Liu T., Yan D., Zhao T., Zhang H., Chen L., Sun W., Yinglan A. (2022) Divergent hydrological responses to forest expansion in dry and wet basins of China: Implications for future afforestation planning. Water Resources Research, 58, e2021WR031856.
Augustinus Benno, Blum Moshe, Citterio Sandra, Gentili Rodolfo, Helman David, Nestel David, Schaffner Urs, Müller-Schärer Heinz, Lensky Itamar M (2022). Ground-truthing predictions of a demographic model driven by land surface temperatures with a weed biocontrol cage experiment. Ecological modeling. 466, 109897.
Wang Qian, Hao Mengmeng, Helman David, Ding Fangyu, Jiang Dong, Xie Xiaolan, Chen Shuai, Ma Tian (2022). Quantifying the influence of climate change on armed conflict in Africa, 2000-2015. Environment, Development and Sustainability.

2021

Xue B., Helman David, Wang G., Xu C-Y, Xiao J., Wang L., Li X., Liu T., Duan L. (2021). The low hydrologic resilience of Asian Water Tower basins to adverse climatic changes. Advances in Water Resources, 155, 103996.
Michael Y.**, Helman David, Glickman O., Gabay D., Brenner S., Lensky I. (2021). Forecasting fire risk with machine learning and dynamic information derived from satellite vegetation index time-series. Science of the Total Environment.
Shiff S., Helman David, Lensky I. (2021). Worldwide continuous gap-filled MODIS land surface temperature dataset. Scientific Data (Nature Group), 8, 74.

2020

Helman David, Mussery A. (2020). Using Landsat satellites to assess the impact of check dams built across erosive gullies on vegetation rehabilitation. Science of the Total Environment, 730, 138873.
Helman David, Zaitchik BF, Funk C. (2020). Climate has contrasting direct and indirect effects on armed conflicts. Environmental Research Letters, 15, 104017.
Helman David, Zaitchik BF. (2020). Temperature anomalies affect violent conflicts in African and Middle Eastern warm regions. Global Environmental Change, 63, 102118.
Xue Baolin, Wang Guoqiang, Xiao Jingfeng, Helman David, Sun Wenchao, Wang Jianhua, Liu Tingxi (2020). Global convergence but regional disparity in the hydrological resilience of ecosystems and watersheds to drought. Journal of Hydrology.
Mussery A.**, Helman David, Agmon Y., Ben-Shabat I., El-Fregat S., Goldman-Golan D. (2020). The indigenous Bedouin farmers as land rehabilitators - setup of an action research programme in the Negev. Land Degradation and Development.
Grodek T., Morin E., Helman David, Lensky I., Dahan O., Seely M., Benito G., Enzel Y. (2020). Eco-hydrology and geomorphology of the largest floods along the hyperarid Kuiseb River, Namibia. Journal of Hydrology, 582.

2019

Ott RF, Gallen SF, Caves RJK, Ivy-Ochs S, Helman David, Fassoulas C, Vockenhuber C, Christl M, Willett SD. (2019). Chemical versus mechanical denudation in meta-clastic and carbonate bedrock on Crete, and mechanisms for steep and high carbonate topography. Journal of Geophysical Research: Earth Surface, 124, 2943–2961.
Helman David, Lensky I, Bonfil DJ. (2019). Early prediction of wheat grain yield production from root-zone water content at heading using Crop RS-Met. Field Crops Research. 232, 11–23.
Helman David, Bonfil DJ, Lensky I. (2019). Crop RS-Met: A biophysical evapotranspiration and root-zone soil water content model for crops based on proximal sensing and meteorological data. Agricultural Water Management, 211, 210–219.
Miller O, Helman David, Svoray T, Morin E, Bonfil DJ.* (2019). Explicit wheat production model adjusted for semi-arid environments. Field Crops Research, 231, 93–104.

2018

Helman David (2018). Land surface phenology: What do we really ‘see’ from space? Science of the Total Environment, 618, 665–673. https://doi.org/10.1016/j.scitotenv.2017.07.237.
Helman David, Bahat I, Netzer Y, Ben-Gal A, Alchanatis V, Peeters A, Cohen Y (2018). Using Time Series of High-Resolution Planet Satellites Images to Monitor Grapevine Stem Water Potential in Commercial Vineyards. Remote Sensing, 10(10), 1615, doi: https://doi.org/10.3390/rs10101615.
Lensky I, Dayan U, Helman David (2018). Synoptic Circulation Impact on the Near Surface Temperature Difference Outweighs That of the Seasonal Signal in the Eastern Mediterranean. Journal of Geophysical Research: Atmospheres. 123 (20), 11,333-11,347. doi:https://doi.org/10.1029/2017JD027973.
Michael Y, Lensky I, Brenner S, Tchetchik A, Tessler N, Helman David (2018). Economic Assessment of Fire Damage to Urban Forest in the Wildland-Urban Interface Using Planet Satellites Constellation Images. Remote Sensing, 10(9), 1479.
Blum M, Nestel D, Cohen Y, Goldshtein E, Helman David, Lensky I (2018). Predicting Heliothis (Helicoverpa armigera) pest population dynamics with an age-structured insect population model driven by satellite data. Ecological Modelling, 369, 1–12. doi.org/10.1016/j.ecolmodel.2017.12.019.
Manfreda S, McCabe M, Miller P, Lucas R, Pajuelo Madrigal V, Mallinis G, Ben-Dor E, Helman David, Estes L, Ciraolo G, Müllerová J, Tauro F, De Lima M I, De Lima J L, Frances F, Caylor K, Kohv M, Maltese A, Perks M, Ruiz-Pérez G, Su Z, Vico G, Toth B. (2018). On the use of Unmanned Aerial Systems for environmental monitoring. Remote Sensing, 10(4), 641, 1–28. doi: 10.3390/rs10040641.

2017

Helman David, Lensky I, Yakir D, Osem Y (2017). Forests growing under dry conditions have higher hydrological resilience to drought than do more humid forests. Global Change Biology, 23, 2801 - 2817. doi:10.1111/gcb.13551.
Helman David, Osem Y, Yakir D, Lensky I. (2017). Relationships between climate, topography, water use and productivity in two key Mediterranean forest types with different water-use strategies. Agricultural and Forest Meteorology, 232, 319 - 330.
Helman David, Lensky I, Osem Y, Rohatyn S, Rotenberg E, Yakir D (2017). A biophysical approach using water deficit factor for daily estimations of evapotranspiration and CO2 uptake in Mediterranean environments. Biogeosciences, 14, 3909-3926. doi.org/10.5194/bg-14-3909-2017.
Helman David, Leu S, Mussery A (2017). Contrasting effects of two Acacia species on understorey growth in a drylands environment: Interplay of canopy shading and litter interference. Journal of Vegetation Science, 28, 1140–1150. doi:10.1111/jvs.12576.

2016

Mussery A, Helman David, Leu S, Budovsky A (2016). Modeling herbaceous productivity considering tree-grass interactions in drylands savannah: The case study of Yatir farm in the Negev drylands. Journal of Arid Environment, 124, 160-164.

2015

Helman David, Givati A, Lensky I. (2015). Annual evapotranspiration retrieved from satellite vegetation indices for the Eastern Mediterranean at 250 m spatial resolution. Atmos. Chem. Phys., 15, 12567-12579, doi:10.5194/acp-15-12567-2015.
Helman David, Lensky I, Tessler N, Osem Y (2015). A phenology -based method for monitoring woody and herbaceous vegetation in Mediterranean forests from NDVI time series. Remote Sensing, 7, 12314-12335.
Rotem-Mindali O, Michael Y, Helman David, Lensky I. (2015). The role of local land-use on the urban heat island effect of Tel Aviv as assessed from satellite remote sensing. Applied Geography, 56, 145 - 153.

2014

Helman David, Lensky I, Mussery A, Leu S (2014). Rehabilitating degraded drylands by creating woodland islets: Assessing long-term effects on aboveground productivity and soil fertility. Agricultural and Forest Meteorology, 195-196, 52 - 60.
Helman David, Mussery A, Lensky I, Leu S (2014). Detecting changes in biomass productivity in different land management regimes in drylands using satellite-derived vegetation index. Soil Use and Management, 30(1), 32 - 39.

* Lab's student ** Lab's manager or assistant