TAILIEUCHUNG - Báo cáo lâm nghiệp: "Chemical composition of the periderm in relation to in situ water absorption rates of oak, beech and spruce fine roots"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài:Chemical composition of the periderm in relation to in situ water absorption rates of oak, beech and spruce fine roots. | Ann. For. Sci. 60 2003 763-772 INRA EDP Sciences 2004 DOI forest 2003071 763 Original article Chemical composition of the periderm in relation to in situ water absorption rates of oak beech and spruce fine roots Christoph LEUSCHNERa Heinz CONERSa Regina ICKEb Klaus HARTMANNc N. Dominique EFFINGERd Lukas SCHREIBERc a Abt. Okologie und Okosystemforschung Albrecht-von-Haller-Institut fur Pflanzenwissenschaften Universităt Gottingen Untere Karspule 2 37073 Gottingen Germany b Abt. Okologie Fachbereich 19 Universităt Gh Kassel Heinrich-Plett-Strasse 40 34132 Kassel Germany c Institut fur Botanik Okophysiologie der Pflanzen Universităt Bonn Kirschallee 1 53115 Bonn Germany d Lehrstuhl Botanik II Universităt Wurzburg Julius-von-Sachs-Platz 3 97082 Wurzburg Germany Received 18 March 2002 accepted 11 September 2002 Abstract - The water absorption by terminal branch roots of mature oak beech and spruce trees was measured in situ with miniature sap flow gauges for 11 consecutive days and related to the suberin and lignin content of the fine root periderm. All fine roots contained a well-developed periderm whereas no primary white roots were present. Mean root water uptake decreased in the sequence beech - spruce - oak. Oak roots contained twice as much suberin and a thicker periderm than beech and had smaller mean water uptake rates 201 vs. 508 g m-2 root surface d-1 . However spruce with 2 to 7 times smaller suberin contents had lower uptake rates 346 g m2 d1 than beech with more suberin. We conclude that the relationship between periderm chemistry and water absorption is only weak in the three species. Other factors such as hydraulic resistances in the soil-root interface or the size of water potential gradients may be more influential in regulating root water uptake. lignin miniature sap flow gauge root hydraulic conductivity root surface area suberin Résumé - Relation entre la composition chimique du périderme et le taux d absorption d eau in situ des petites .

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