Filtering by Subject: Plant Sciences

Mapping invasive Lupinus polyphyllus Lindl. in semi-natural grasslands using object-based analysis of UAV-borne images

Jayan Sri Jeewantha Wijesingha, Thomas Astor, Damian Schulze-Brüninghoff, et al.

Published: 2020-02-28
Subjects: Biodiversity, Earth Sciences, Environmental Sciences, Life Sciences, Physical Sciences and Mathematics, Plant Sciences

Knowledge on the spatio-temporal distribution of invasive plant species is vital to maintain biodiversity in grasslands which are threatened by the invasion of such plants and to evaluate the effect of control activities conducted. Manual digitising of aerial images with field verification is the standard method to create maps of the invasive Lupinus polyphyllus Lindl. (Lupine) in semi-natural [...]

Canopy structure explains the relationship between photosynthesis and sun-induced chlorophyll fluorescence in crops

Benjamin Dechant, Youngryel Ryu, Grayson Badgley, et al.

Published: 2019-09-30
Subjects: Agricultural Science, Life Sciences, Physiology, Plant Sciences

Remote sensing of far-red sun-induced chlorophyll fluorescence (SIF) has emerged as an important tool for studying gross primary productivity (GPP) at the global scale. However, the relationship between SIF and GPP at the canopy scale lacks a clear mechanistic explanation. This is largely due to the poorly characterized role of the relative contributions from canopy structure and leaf physiology [...]

Realistic and simplified models of plant and leaf area indices for a seasonally dry tropical forest

Rodrigo de Queiroga Miranda, Rodolfo Luiz Bezerra Nóbrega, Magna Soelma Beserra de Moura, et al.

Published: 2019-08-06
Subjects: Civil and Environmental Engineering, Desert Ecology, Ecology and Evolutionary Biology, Engineering, Environmental Engineering, Forest Management, Forest Sciences, Life Sciences, Plant Sciences, Research Methods in Life Sciences

Leaf Area Index (LAI) models that consider all phenological stages have not been developed for the Caatinga, the largest seasonally dry tropical forest in South America. LAI models that are currently used show moderate to high covariance when compared to in situ data, but they often lack accuracy in the whole spectra of possible values and do not consider the impact that the stems and branches [...]

A practical approach for estimating the escape ratio of near-infrared solar-induced chlorophyll fluorescence

Yelu Zeng, Grayson Badgley, Benjamin Dechant, et al.

Published: 2019-07-24
Subjects: Life Sciences, Physiology, Plant Sciences

Solar-induced chlorophyll fluorescence (SIF) has emerged as a leading approach for remote sensing of gross primary productivity (GPP). While SIF has an intrinsic, underlying relationship with canopy light capture and light use efficiency, these physiological relationships are obscured by the fact that satellites observe a small and variable fraction of total emitted canopy SIF. Upon emission, [...]

The Baltic TRANSCOAST approach – investigating shallow coasts as terrestrial-marine interface of water and matter fluxes

Manon Janssen, Michael E Böttcher, Martin Brede, et al.

Published: 2019-07-16
Subjects: Biogeochemistry, Biology, Earth Sciences, Environmental Monitoring, Environmental Sciences, Hydrology, Life Sciences, Marine Biology, Oceanography and Atmospheric Sciences and Meteorology, Other Oceanography and Atmospheric Sciences and Meteorology, Other Plant Sciences, Physical Sciences and Mathematics, Plant Sciences, Soil Science

In Baltic TRANSCOAST we study the physical, biogeochemical, and biological processes at the land-ocean interface. The coastal zone is heavily impacted by various human activities as well as by geomorphological and climatic processes – on both the land and the sea side. Land-sea interactions at low lying coastal areas that are often dominated by peatlands, and are a common feature along the Baltic [...]

To be or not to be: Prospects for rice self-sufficiency in China

Nanyan Deng, Patricio Grassini, Haishun Yang, et al.

Published: 2018-08-29
Subjects: Agronomy and Crop Sciences Life Sciences, Life Sciences, Plant Sciences

China produces 28% of global rice supply and is currently self-sufficient despite a massive rural to urban demographic transition that drives intense competition for land and water resources. At issue is whether to remain self-sufficient, which depends on the potential to raise yields on existing rice land. Here we report the first high-resolution spatial analysis of rice production potential in [...]

Terrestrial Gross Primary Production: Using NIRv to Scale from Site to Globe

Grayson Badgley, Leander D. L. Anderegg, Joseph A. Berry, et al.

Published: 2018-07-24
Subjects: Ecology and Evolutionary Biology, Life Sciences, Physiology, Plant Sciences

Terrestrial photosynthesis is the largest and one of the most uncertain fluxes in the global carbon cycle. We find that NIRv, a remotely sensed measure of canopy structure, accurately predicts photosynthesis at FLUXNET validation sites at monthly to annual timescales (R2 = 0.68), without the need for difficult to acquire information about environmental factors that constrain photosynthesis at [...]

Leaf trait acclimation amplifies simulated climate warming in response to elevated carbon dioxide

Marlies Kovenock, Abigail L.S. Swann

Published: 2018-01-10
Subjects: Earth Sciences, Ecology and Evolutionary Biology, Environmental Sciences, Life Sciences, Physical Sciences and Mathematics, Physiology, Plant Sciences

Vegetation modifies Earth’s climate by controlling the fluxes of energy, carbon, and water. Of critical importance is a better understanding of how vegetation responses to climate change will feedback on climate. Observations show that plant traits respond to elevated carbon dioxide concentrations. These plant trait acclimations can alter leaf area and thus productivity and surface energy fluxes. [...]


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