Functional Ecology, Vol 10 - n°2. An improved dynamic chamber technique for measuring CO2 efflux from the surface of soil / C. Fang (1996)

Public ISBD Titre de série : Functional Ecology, Vol 10 - n°2 Titre : An improved dynamic chamber technique for measuring CO2 efflux from the surface of soil Type de document : texte imprimé Auteurs : C. Fang, Auteur ; J.B. Moncrieff, Auteur Année de publication : 1996 Importance : pp. 297-305 Présentation : ill., graph., tabl., réf. Langues : Anglais (eng) Catégories : Thésaurus Agrovoc Sol ; Respiration ; Pression ; Dynamique des sols Résumé : 1. A new dynamic chamber has been developed with the aim of improving the performance of existing techniques for measuring CO2 efflux from the soil surface. It has been shown that differences in the flow rates of incoming and outgoing air can be balanced quickly with this new chamber, consequently reducing the pressure difference between the inside and outside of the chamber. In the new chamber, the pressure difference varied within ± 0.2 Pa at flow rates of up to 4 litres min-1 when placed on the soil surface, whereas the corresponding value for an earlier design of chamber was about ± 1.0 Pa. The improved chamber can give a better and a more reliable estimation of CO2 evolution from the soil surface compared to existing dynamic chambers, as demonstrated by either the magnitude or the trend of daily variation of measured CO2 effluxes. 2. In a dynamic chamber technique, the pressure difference depends mainly upon the flow rate of sample air and the length and diameter of inlet or outlet tubing through which air passes into or out of the chamber. It is difficult to obtain a steady and negligible pressure difference with a normal dynamic chamber, especially if the method employs simultaneously blowing and drawing air, as the pressure difference is very changeable. Type de document : Tiré à part Permalien de la notice : https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=148766 Functional Ecology, Vol 10 - n°2. An improved dynamic chamber technique for measuring CO2 efflux from the surface of soil [texte imprimé] / C. Fang, Auteur ; J.B. Moncrieff, Auteur . - 1996 . - pp. 297-305 : ill., graph., tabl., réf. Langues : Anglais (eng) Catégories : Thésaurus Agrovoc Sol ; Respiration ; Pression ; Dynamique des sols Résumé : 1. A new dynamic chamber has been developed with the aim of improving the performance of existing techniques for measuring CO2 efflux from the soil surface. It has been shown that differences in the flow rates of incoming and outgoing air can be balanced quickly with this new chamber, consequently reducing the pressure difference between the inside and outside of the chamber. In the new chamber, the pressure difference varied within ± 0.2 Pa at flow rates of up to 4 litres min-1 when placed on the soil surface, whereas the corresponding value for an earlier design of chamber was about ± 1.0 Pa. The improved chamber can give a better and a more reliable estimation of CO2 evolution from the soil surface compared to existing dynamic chambers, as demonstrated by either the magnitude or the trend of daily variation of measured CO2 effluxes. 2. In a dynamic chamber technique, the pressure difference depends mainly upon the flow rate of sample air and the length and diameter of inlet or outlet tubing through which air passes into or out of the chamber. It is difficult to obtain a steady and negligible pressure difference with a normal dynamic chamber, especially if the method employs simultaneously blowing and drawing air, as the pressure difference is very changeable. Type de document : Tiré à part Permalien de la notice : https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=148766

Réservation

Réserver ce document

Exemplaires

Localisation	Emplacement	Section	Cote	Support	Code-barres	Disponibilité
Kourou	Archives	AgroParisTech-Kourou	TP6274	Papier Périodique	9120	Empruntable

Functional Ecology, Vol 4 - n°1. Allometry of saplings and understorey trees of a panamanian forest / D.A. King (1990)

Public ISBD Titre de série : Functional Ecology, Vol 4 - n°1 Titre : Allometry of saplings and understorey trees of a panamanian forest Type de document : texte imprimé Auteurs : D.A. King, Auteur Année de publication : 1990 Importance : pp. 27-32 Présentation : graph., tabl., réf. Langues : Anglais (eng) Catégories : Thésaurus Agrovoc Allométrie ; Dendrométrie ; Panama ; Acer macrophyllum ; Meliaceae ; Spermatophyta ; Sous-bois Type de document : Tiré à part Permalien de la notice : https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=147860 Functional Ecology, Vol 4 - n°1. Allometry of saplings and understorey trees of a panamanian forest [texte imprimé] / D.A. King, Auteur . - 1990 . - pp. 27-32 : graph., tabl., réf. Langues : Anglais (eng) Catégories : Thésaurus Agrovoc Allométrie ; Dendrométrie ; Panama ; Acer macrophyllum ; Meliaceae ; Spermatophyta ; Sous-bois Type de document : Tiré à part Permalien de la notice : https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=147860

Réservation

Réserver ce document

Exemplaires

Localisation	Emplacement	Section	Cote	Support	Code-barres	Disponibilité
Kourou	Archives	AgroParisTech-Kourou	TP5651	Papier Périodique	9023	Empruntable

Functional Ecology, Vol 7 - n°2. Canopy structure of a tropical rain forest and the nature of an unstratified upper layer / F. Koike (1993)

Public ISBD Titre de série : Functional Ecology, Vol 7 - n°2 Titre : Canopy structure of a tropical rain forest and the nature of an unstratified upper layer Type de document : texte imprimé Auteurs : F. Koike, Auteur ; Syahbuddin, Auteur Année de publication : 1993 Importance : pp. 230-235 Présentation : ill., graph., tabl., réf. Langues : Anglais (eng) Catégories : Thésaurus Agrovoc Indonésie ; Feuillage ; Croissance ; Sumatra ; Asie ; Stratification ; Zone tropicale Résumé : The two-dimensional distribution of foliage density was investigated in a vertical canopy section of forest in West Sumatra, using analysis of variance. No significant continuous upper canopy layer could be found. However, there was significant stratification with a dense foliage layer below 15 m. The structure of the upper canopy (higher than 15 m) had an erect structure rather than being stratified. Two hypotheses were examined to explain the unstratified upper canopy structure: it was due to incomplete growth in height of the trees, leading to an unstratified forest canopy even in mono-specific forest, or it was caused by a mixture of species with different potential for height growth. The latter hypothesis was supported by the observations on tree growth (...) Type de document : Tiré à part Permalien de la notice : https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=147840 Functional Ecology, Vol 7 - n°2. Canopy structure of a tropical rain forest and the nature of an unstratified upper layer [texte imprimé] / F. Koike, Auteur ; Syahbuddin, Auteur . - 1993 . - pp. 230-235 : ill., graph., tabl., réf. Langues : Anglais (eng) Catégories : Thésaurus Agrovoc Indonésie ; Feuillage ; Croissance ; Sumatra ; Asie ; Stratification ; Zone tropicale Résumé : The two-dimensional distribution of foliage density was investigated in a vertical canopy section of forest in West Sumatra, using analysis of variance. No significant continuous upper canopy layer could be found. However, there was significant stratification with a dense foliage layer below 15 m. The structure of the upper canopy (higher than 15 m) had an erect structure rather than being stratified. Two hypotheses were examined to explain the unstratified upper canopy structure: it was due to incomplete growth in height of the trees, leading to an unstratified forest canopy even in mono-specific forest, or it was caused by a mixture of species with different potential for height growth. The latter hypothesis was supported by the observations on tree growth (...) Type de document : Tiré à part Permalien de la notice : https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=147840

Réservation

Réserver ce document

Exemplaires

Localisation	Emplacement	Section	Cote	Support	Code-barres	Disponibilité
Kourou	Archives	AgroParisTech-Kourou	TP5593	Papier Périodique	10264	Empruntable