Climate and seasonal rainfall anomalies along an elevational gradient in the El Sira Mountains,Peru,and their impacts on tree radial growth  

作　　者：Armin Niessner Manfred Kuppers James Graham Luis Valenzuela Aylin Guney Sabine Remmele Reiner Zimmermann 

机构地区：[1]Institute of Botany 210a,University of Hohenheim,Garbenstraße 30,70599 Stuttgart,Germany [2]Field Museum,1400 S.Lake Shore Drive,Chicago,IL 60605,USA [3]Missouri Botanical Garden,Prolongacio´n Bolognesi Mz.E Lote 6,Oxapampa-Pasco,Peru

出　　处：《Journal of Forestry Research》2020年第5期1521-1538,共18页林业研究（英文版）

基　　金：supported by the German Federal Ministry of the Environment;Nature Conservation and Nuclear Safety(BMU);the German Corporation for International Cooperation GmbH(GIZ)。

摘　　要：The explicit purpose of this study was to characterize climate and vegetation along the western slope of the El Sira Mountains(Peru)and evaluate radial tree growth in response to seasonal rainfall anomalies.From May 2011 until September 2015,we monitored radial stem growth of 67 trees using point dendrometers and measured climate within five sites along an altitudinal gradient.The transect extends from lowland terra firme forests,over submontane forests,late and mid successional montane cloud forests up to exposed elfin forests.Monthly rainfall estimates by the TRMM PR satellite(product 3B42)were highly correlated with our rain gauge observations but underestimate rainfall at high altitudes.Different intra-annual tree growth patterns could be identified within each elevational forest type,showing species with strictly seasonal growth,continuous growth or alternating growth patterns independent of the seasons.Stem growth at each site was generally larger during rainy seasons,except for the elfin forest.The rainy season from October 2013 to March 2014 was extraordinarily dry,with only 73%of long-term mean precipitation received,which resulted in reduced radial growth,again with the exception of the elfin forest.This indicates that montane tropical rain forests may suffer from prolonged droughts,while exposed ridges with elfin forests still receive plenty of precipitation and benefit from receiving more solar radiation for photosynthesis.

关 键 词：Cloud forest DENDROMETER Elfin forest SEASONALITY TRMM PR Tropical montane forest 

分 类 号：S718.5[农业科学—林学]