A phytolith index as a proxy of tree cover density in tropical areas:: Calibration with Leaf Area Index along a forest-savanna transect in southeastern Cameroon

被引:163
作者
Bremond, L [1 ]
Alexandre, A [1 ]
Hély, C [1 ]
Guiot, J [1 ]
机构
[1] UM GECO, CEREGE, CNRS, UMR 6635, F-13545 Aix En Provence, France
关键词
phytoliths; LAI; pollen; tropical forest-savanna transition; calibration; Cameroon;
D O I
10.1016/j.gloplacha.2004.09.002
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
The aim of the study is to calibrate the phytolith index of tree cover density, D/P (the ratio of ligneous dicotyledons phytoliths (D) over Poaceae phytoliths (P)) with Leaf Area Index (LAI) measurements. LAI is the vertically integrated surface of leaves per unit of ground area (m(2) leaves/m(2) ground). Modern soil samples from southeastern Cameroon, collected along a continuous forest-savarina transect, have been analyzed for phytoliths. Phytolith assemblages and D/P index clearly record the physiognomy of the forest and savanna communities and of the transition between both of them. A highly significant relationship was obtained between D/P and LAI. The relationship between phytolith data and the vegetation transect is also discussed and compared with existing palynological results obtained along the same transect. (c) 2004 Elsevier B.V All rights reserved.
引用
收藏
页码:277 / 293
页数:17
相关论文
共 88 条
[1]   Determination of deforestation rates of the world's humid tropical forests [J].
Achard, F ;
Eva, HD ;
Stibig, HJ ;
Mayaux, P ;
Gallego, J ;
Richards, T ;
Malingreau, JP .
SCIENCE, 2002, 297 (5583) :999-1002
[2]  
Achoundong G, 2000, DYNAMIQUE LONG TERME, P31
[3]   Late Holocene phytolith and carbon-isotope record from a latosol at Salitre, south-central Brazil [J].
Alexandre, A ;
Meunier, JD ;
Mariotti, A ;
Soubies, F .
QUATERNARY RESEARCH, 1999, 51 (02) :187-194
[4]   Phytoliths: indicators of grassland dynamics during the late Holocene in intertropical Africa [J].
Alexandre, A ;
Meunier, JD ;
Lezine, AM ;
Vincens, A ;
Schwartz, D .
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, 1997, 136 (1-4) :213-229
[5]  
Alexandre A., 2000, 3 INT M PHYT RES MAN, P1
[6]   LATE QUATERNARY BIOMASS CHANGES FROM C-13 MEASUREMENTS IN A HIGHLAND PEATBOG FROM EQUATORIAL AFRICA (BURUNDI) [J].
AUCOUR, AM ;
HILLAIREMARCEL, C ;
BONNEFILLE, R .
QUATERNARY RESEARCH, 1994, 41 (02) :225-233
[7]  
Baker RG, 2000, QUATERN INT, V67, P75
[8]   Phytoliths as paleoenvironmental indicators, West Side Middle Awash Valley, Ethiopia [J].
Barboni, D ;
Bonnefille, R ;
Alexandre, A ;
Meunier, JD .
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, 1999, 152 (1-2) :87-100
[9]   South and southeast Brazilian grasslands during Late Quaternary times: a synthesis [J].
Behling, H .
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, 2002, 177 (1-2) :19-27
[10]  
BEYALA VK, 2000, DYNAMIQUES LON TERME, P175