The applicability of a color acetate film for estimating photosynthetic photon flux density in a forest understory

Kawamura, Kôji; Cho, Michiko; Takeda, Hiroshi

doi:10.1007/s10310-004-0141-8

Cited by 18 publications

(9 citation statements)

References 1 publication

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“…The PPFD of all odd (1, 3, 5, 7, 9, 11 and 13) and all even (2, 4, 6, 8 10 and 12) number leaves were measured in wide rows (WR; right side) and narrow rows (NR; left side), respectively under 2M2S, 1M1S and M. In addition, PPFD at the top of soybean canopy was also determined at second trifoliate stage (V 2 ), fifth trifoliate stage (V 5 ) and flower initiation (R 1 ) stages corresponding to TS, GFS and MS stages of maize, respectively ( Fig 2 ). The measurements were performed following a previously described method [28]. A color acetate film (O-1D, Taisei Chemical Industries, Tokyo, Japan) and Aquation Scientific Equipment (opto leaf, D-Meter RYO-470, Taisei Chemical Industries, Tokyo, Japan) were used to record and read the data.…”

Section: Methodsmentioning

confidence: 99%

Narrow-wide row planting pattern improves the light environment and seed yields of intercrop species in relay intercropping system

et al. 2019

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Different planting patterns affect the light interception of intercrops under intercropping conditions. Here we revealed that narrow-wide-row relay-intercropping improves the light interception across maize leaves in wide rows (60cm) and narrow rows (40cm), accelerated the biomass production of intercrop-species and compensated the slight maize yield loss by considerably increasing the soybean yield. In a two-year experiment, maize was planted with soybean in different planting patterns (1M1S, 50:50cm and 2M2S, 40:60cm) of relay-intercropping, both planting patterns were compared with sole cropping of maize (M) and soybean (S). As compared to M and 1M1S, 2M2S increased the total light interception of maize leaves in wide rows (WR) by 27% and 23%, 20% and 10%, 16% and 9% which in turn significantly enhanced the photosynthetic rate of WR maize leaves by 7% and 5%, 12% and 9%, and 19% and 4%, at tasseling, grain-filling and maturity stage of maize, respectively. Similarly, the light transmittance at soybean canopy increased by 218%, 160% and 172% at V 2 , V 5 and R 1 stage in 2M2S compared with 1M1S. The improved light environment at soybean canopy in 2M2S considerably enhanced the mean biomass accumulation, and allocation to stem and leaves of soybean by 168%, and 131% and 207%, respectively, while it decreased the mean biomass accumulation, and distribution to stem, leaves and seed of maize by 4%, and 4%, 6% and 5%, respectively than 1M1S. Compared to 1M1S, 2M2S also increased the CR values of soybean (by 157%) but decreased the CR values of maize (by 61%). Overall, under 2M2S, relay-cropped maize and soybean produced 94% and 69% of the sole cropping yield, and the 2M2S achieved LER of 1.7 with net income of 1387.7 US $ ha -1 in 2016 and 1434.4 US $ ha -1 in 2017. Our findings implied that selection of optimum planting pattern (2M2S) may increase the light interception and influence the light distribution between maize and soybean rows under relay-intercropping conditions which will significantly increase the intercrops productivity. Therefore, more attention should be paid to the light environment when considering the sustainability of maize-soybean relay-intercropping via appropriate planting pattern selection.

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Section: Methodsmentioning

confidence: 99%

Narrow-wide row planting pattern improves the light environment and seed yields of intercrop species in relay intercropping system

et al. 2019

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“…Solar radiation interception of plants was measured on all fully expanded leaves using OptoLeaf (Long-term measurement type, Japan) for a week (Kawamura et al, 2005). Net photosynthetic rate (Pn) was measured on the youngest fully expanded leaf using a Li6400 photosynthesis system (Li-COR, Lincoln, NE, United States).…”

Section: Methodsmentioning

confidence: 99%

Interactions Between Light Intensity and Phosphorus Nutrition Affect the P Uptake Capacity of Maize and Soybean Seedling in a Low Light Intensity Area

Zhou

Wang

et al. 2019

Front. Plant Sci.

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To capture more nutrients, root systems of maize ( Zea mays L.) and soybean ( Glycine max L.) exhibit morphological and physiological plasticity to a localized supply of phosphorus (P). However, the mechanisms of the interaction between light intensity and P affecting root morphological and physiological alterations remain unclear. In the present study, the regulation of P uptake capacity of maize and soybean by light intensity and localized P supply was investigated in a low solar radiation area. The plants were grown under continual and disrupted light conditions with homogeneous and heterogeneous P supply. Light capture of maize and soybean increased under the disrupted light condition. Plant dry weight and P uptake were increased by more light capture, particularly when plants were grown in soil with heterogeneous P supply. Similarly, both localized P supply and disrupted light treatment increased the production of fine roots and specific root length in maize. Both homogeneous P supply and disrupted light treatment increased the malate and citrate exudation in the root of soybean. Across all of the experimental treatments, high root morphological plasticity of maize and root physiological plasticity of soybean were associated with lower P concentrations in leaves and greater sucrose concentrations in roots. It is suggested that the carbon (C), exceeded shoot growth capabilities and was transferred to roots as sucrose, which may serve as both a nutritional signal and a C-substrate for root morphological and physiological changes.

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“…Kawamura et al () clarified that the fading rate is strongly correlated with the integrated photosynthetic photon flux density (PPFD, mol/m 2 ) in the forest understory environment. Hence, to obtain an analytical curve of the fading rate vs. integrated PPFD (mol/m 2 ) for the site, we set up a quantum sensor (LI‐190SA; LI‐COR, Lincolon, Nebraska, USA) in a gap adjacent to the study plot, and PPFD was recorded every 30 min using a data logger (LI‐1400; LI‐COR).…”

Section: Methodsmentioning

confidence: 99%

Aggregated recruitment patterns under adult crowns inPhotinia glabra, a bird‐dispersed tree species

Kuge

Hirayama

2017

Plant Species Biology

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To clarify recruitment patterns of Photinia glabra, which is an evergreen, broad-leaved, bird-dispersed tree species, we analyzed spatial distribution in P. glabra recruits at each growth stage and demography of current-year seedlings with respect to distributions of adults in a warm-temperate secondary forest, western Japan. Although individuals ≥ 5 cm diameter at breast height (DBH) that had nearly produced fruits showed a random distribution, seedlings (≥ 1 year old, < 10-cm stem length [SL]), small saplings (10 ≤ SL < 30 cm) and large saplings (≥ 30-cm SL, < 5-cm DBH) were clumped and associated with reproductive adults at approximately 2-3-m scales, nearly equal to their average crown radius. Based on monitoring the demography of current-year seedlings, emerged seedling density profoundly decreased, and no seedlings survived at longer than an adult's crown scales, with distance-dependent mortality as a result of disease and herbivory not greatly affecting the current-year seedling mortality. Thus, aggregated seed dispersal under the crown of adult P. glabra would directly influence the distribution of recruits for P. glabra in this forest. Of the bird-dispersed tree species in this forest, P. glabra produced the highest amount of fruits during large crop years, and their fruits ripened during the late seasonal period (early January), suggesting that birds might be strongly attracted to these species, in turn leading to seeds being deposited mostly under the tree crowns. We propose that dispersal limitation would occur, even in a bird-dispersed tree species such as P. glabra, owing to plant-bird interactions in the forest.

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The applicability of a color acetate film for estimating photosynthetic photon flux density in a forest understory

Cited by 18 publications

References 1 publication

Narrow-wide row planting pattern improves the light environment and seed yields of intercrop species in relay intercropping system

Narrow-wide row planting pattern improves the light environment and seed yields of intercrop species in relay intercropping system

Interactions Between Light Intensity and Phosphorus Nutrition Affect the P Uptake Capacity of Maize and Soybean Seedling in a Low Light Intensity Area

Aggregated recruitment patterns under adult crowns inPhotinia glabra, a bird‐dispersed tree species

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