Carbon fixation capacity and value estimation of taxodium hybrid in the wetland in plateau: taking the Dianchi forest wetland as an example

2021 ◽  
Author(s):  
Shan Xu ◽  
Changtong Zhao ◽  
Zhen Ling ◽  
Minghua Dong ◽  
Han Meng
Keyword(s):  
Carbon Fixation ◽  
Value Estimation ◽  
Fixation Capacity

scholarly journals Thinning effect on understory community and photosynthetic characteristics in a subtropical Pinus massoniana plantation

2017 ◽  
Vol 47 (8) ◽  
pp. 1104-1115 ◽  
Author(s):  
Chuanpeng Cheng ◽  
Yidong Wang ◽  
Xiaoli Fu ◽  
Mingjie Xu ◽  
Xiaoqin Dai ◽  
...  
Keyword(s):  
Carbon Fixation ◽  
Chlorophyll Concentration ◽  
Basal Area ◽  
Wiener Index ◽  
Pinus Massoniana ◽  
Leaf Length ◽  
Photosynthetic Characteristics ◽  
Leaf Chlorophyll ◽  
Fern Species ◽  
Fixation Capacity

Thinning forest stands changes biotic and abiotic conditions, subsequently altering understory communities including their photosynthetic characteristics. We investigated the effects of thinning (25% basal area decrease) in a subtropical Pinus massoniana Lamb. plantation at two post-thinning times: 0.5 years (PT0.5) and 2.5 years (PT2.5). Thinning (PT0.5 and PT2.5) significantly increased understory density (+104.9% and +142.4%, respectively), aboveground biomass (+191.1% and +239.2%, respectively), the Shannon–Wiener index, and the Pielou index and decreased the Simpson index (p < 0.05). Species richness significantly increased at PT0.5 and decreased at PT2.5 (p < 0.05). Photosynthetic characteristics of new and old leaves of three dominant species (Woodwardia japonica (Linn. f.) Sm., Dryopteris championii (Benth.) C. Chr., and Dicranopteris dichotoma (Thunb.) Bernh.) showed different variations at 0.5 and 2.5 years after thinning, depending on their various adaptive strategies. Generally, thinning improved leaf carbon fixation capacity of these dominant plants (except W. japonica old leaves). Leaf photosynthetic characteristics of these species exhibited some common changes with respect to leaf morphological attributes and chlorophyll content. Thinning increased new-leaf length (or width) and reduced old-leaf chlorophyll b concentration at PT0.5 but reduced new-leaf length, specific leaf area, and all-leaf chlorophyll concentration at PT2.5. In conclusion, thinning is a useful tool for increasing understory abundance and carbon fixation capacity of some fern species.

scholarly journals Multi-omics Analysis of the Symbiotic Green Algae, Chlorella Variabilis, Revealing the Genetic Basis of the Obligate Endosymbiotic Lifestyle

2021 ◽  
Author(s):  
Ryuhei Minei ◽  
Ryo Hoshina ◽  
Rina Higuchi ◽  
Lin Chen ◽  
Yuki Akizuki ◽  
...  
Keyword(s):  
Genetic Basis ◽  
Carbon Fixation ◽  
Absorption Efficiency ◽  
Secondary Endosymbiosis ◽  
Genomic Changes ◽  
Cell Wall Biogenesis ◽  
Chlorella Variabilis ◽  
Photosynthetic Eukaryotes ◽  
Living Species ◽  
Fixation Capacity

Abstract Background: Photosynthetic eukaryotes have evolved through the acquisition of plastids by secondary endosymbiosis, a process that requires several steps. Immediately before plastid acquisition, the genome of the symbiont is known to be dramatically reduced, but few studies have focused on the genomic changes in the symbiont at the early stages of secondary endosymbiosis. Methods: To investigate the genetic basis of the transition from facultative to obligate endosymbiosis, we compared the genomes of Chlorella variabilis, a representative symbiotic alga, with that of Paramecium bursaria, to compare closely related free-living species and transcriptomes between organisms in symbiotic and non-symbiotic conditions. Results: We found that the non-reduced genome of C. variabilis and its genes play a crucial role in endosymbiosis, being involved in cell wall biogenesis and degradation, and metabolic exchanges with the host. Our results suggest that the genetic mechanism underlying the enhancement of photosynthesis under symbiosis is the increasing light absorption efficiency and carbon fixation capacity of the endosymbiont, resulting in an increase in the supply of maltose to P. bursaria.

A case study for an estimation of carbon fixation capacity in the mangrove plantation of Rhizophora apiculata trees in Trat, Thailand

2013 ◽  
Vol 310 ◽  
pp. 1016-1026 ◽  
Author(s):  
Yosuke Okimoto ◽  
Akihiro Nose ◽  
Kenzo Oshima ◽  
Yutaka Tateda ◽  
Takashi Ishii
Keyword(s):  
Carbon Fixation ◽  
Rhizophora Apiculata ◽  
Fixation Capacity

Sectioned rubisco crystals in TEM

1990 ◽  
Vol 48 (3) ◽  
pp. 664-665
Author(s):  
Gunnel Karlsson ◽  
Jan-Olov Bovin ◽  
Michael Bosma
Keyword(s):  
Plant Cell ◽  
Carbon Fixation ◽  
Unit Cell ◽  
Protein Crystals ◽  
Unit Cell Parameters ◽  
Cell Parameters ◽  
Photosynthetic Carbon Fixation ◽  
Photosynthetic Carbon

RuBisCO (D-ribulose-l,5-biphosphate carboxylase/oxygenase) is the most aboundant enzyme in the plant cell and it catalyses the key carboxylation reaction of photosynthetic carbon fixation, but also the competing oxygenase reaction of photorespiation. In vitro crystallized RuBisCO has been studied earlier but this investigation concerns in vivo existance of RuBisCO crystals in anthers and leaves ofsugarbeets. For the identification of in vivo protein crystals it is important to be able to determinethe unit cell of cytochemically identified crystals in the same image. In order to obtain the best combination of optimal contrast and resolution we have studied different staining and electron accelerating voltages. It is known that embedding and sectioning can cause deformation and obscure the unit cell parameters.

The Factors Influencing Tourist Visitations Number in Curug Silawe

2019 ◽  
Vol 2 (3) ◽  
pp. 553-561
Author(s):  
Novian Hangga Prakosa ◽  
Fafurida Fafurida
Keyword(s):  
Economic Value ◽  
Consumer Surplus ◽  
Sampling Technique ◽  
Travel Cost ◽  
Analysis Tool ◽  
Literature Study ◽  
Factors Influencing ◽  
Negative Effect ◽  
Value Estimation ◽  
Positive Effect

The purposes of this research are to identify the influence of travel cost, income, distance, access, facilities, natural beautiness, and age on the number of individual visits to Curug Silawe and to estimate the economic value of Curug Silawe through individual travel cost method. The population in this study are tourists that visited Curug Silawe with sample of 98 respondents taken by the quota accidental sampling technique. The data collection method used are literature study and questionnaire. The analysis tool used are OLS linear regression and economic value estimation. The results showed the variables that influence the number of individual visits to Curug Silawe are income, distance and age. Income and age has a positive effect. While distance has a negative effect. The economic value of Curug Silawe reached IDR 1,109,930,140.48 per year. This value is obtained from consumer surplus obtained per individual per year of IDR 308,656.88. Tujuan dari penelitian ini adalah untuk mengidentifikasi pengaruh biaya perjalanan, pendapatan, jarak, akses, fasilitas, keindahan alam, dan usia pada jumlah kunjungan individu ke Curug Silawe dan untuk memperkirakan nilai ekonomi Curug Silawe melalui metode biaya perjalanan individu . Populasi dalam penelitian ini adalah wisatawan yang berkunjung ke Curug Silawe dengan sampel 98 responden yang diambil dengan teknik quota accidental sampling. Metode pengumpulan data yang digunakan adalah studi literatur dan kuesioner. Alat analisis yang digunakan adalah regresi linear OLS dan estimasi nilai ekonomi. Hasil penelitian menunjukkan variabel yang mempengaruhi jumlah kunjungan individu ke Curug Silawe adalah pendapatan, jarak dan usia. Penghasilan dan usia memiliki efek positif. Sedangkan jarak memiliki efek negatif. Nilai ekonomi Curug Silawe mencapai Rp1.109.930.140,48 per tahun. Nilai ini diperoleh dari surplus konsumen yang diperoleh per individu per tahun sebesar Rp308.656,88.

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