SENSITIVITY OF CONIFEROUS TREES TO ENVIRONMENTAL FACTORS AT DIFFERENT SCALES IN THE SMALL XING’AN MOUNTAINS, CHINA
SENSITIVITY OF CONIFEROUS TREES TO ENVIRONMENTAL FACTORS AT DIFFERENT SCALES IN THE SMALL XING’AN MOUNTAINS, CHINA
复制标题
DOI：
10.3773/j.issn.1005-264x.2008.01.009
复制
发表时间：
2008-01
影响因子：
--
通讯作者：
Chang Yu;BU Ren-cang;He Hongshi;L. Xiuzhen;Hu Yuanman
中科院分区：
文献类型：
--
作者：
Chang Yu;BU Ren-cang;He Hongshi;L. Xiuzhen;Hu Yuanman
目的预测小兴安岭针叶树种的分布，确定树种对环境因子的敏感性，为森林更新和生物多样性保护提供重要信息，并为森林管理决策者在不同尺度上提供参考。选择地形位置指数、年平均气温和年平均降水量作为预测红松发生的Logistic回归指标（Pinus koraiensis）、落叶松（落叶松），冷杉（冷杉属），云杉（红皮云杉（Picea koraiensis）和长白云杉（P.jezoensis））和蒙古樟子松（Mongol scotch pine）的由于Logistic回归难以解释，结果表明：杉木模型的拟合度最好（ROC 80%），红松、云杉和落叶松的拟合度较好在区域尺度上，红松、冷杉、红松、油松、油松云杉和樟子松对年平均降水量最敏感，落叶松对坡度最敏感;在局部尺度上，红松对坡度最敏感，冷杉和云杉对海拔最敏感，落叶松对坡位最敏感。在不同尺度上，影响红松种群发生的最重要因子的转移伴随着分布类型的变化，在区域尺度上，红松种群的聚集性更强冷杉和云杉在区域尺度上呈聚集分布，但在局部尺度上接近随机分布（ROC= 60%），即：北方优势种落叶松在局部范围内的聚集性增强从区域尺度到地方尺度，影响物种分布的主要因子发生了变化，大多数物种对区域尺度的气候因子和地方尺度的地理因子敏感，但对气候因子的敏感性不高，对地理因子的敏感性不高。但由于该地区存在逆温现象，落叶松对地理因子的反应最为敏感。
Aims Our objective is to predict the distribution of coniferous species and determine species' sensitivity to environmental factors in the Small Xing'an Mountains,China.This information is important for forest regeneration and biodiversity conservation and is useful to policy makers for forest management at different scales.Methods Slope,aspect,compound topographic index,elevation,topographic position index and average annual temperature and precipitation were selected for use in Logistic regression to predict the occurrence of Korean pine(Pinus koraiensis),larch(Larix gmelinii),fir(Abies nephrolepis),spruces(Picea koraiensis and P.jezoensis) and Mongol scotch pine's(Pinus sylvestris var.mongolica).Relative operating characteristic(ROC) was used to evaluate the Logistic models.Because Logistic regression is difficult to explain,we used the correlation coefficient between species distribution and environmental factors to explore the sensitivity of species to environmental factors.Important findings The fir model had best fitness(ROC 80%),and Korean pine,spruces and larch had good fitness(ROC = 60%-80%).The predictions of Mongol scotch pine,a rare species,had low accuracy.At the regional scale,Korean pine,fir,spruces and Mongol scotch pine were the most sensitive to average annual precipitation,and larch was the most sensitive to slope.At local scale,Korean pine was the most sensitive to slope,fir and spruces to elevation and larch to slope position.In addition,this shift of the most important factor in species occurrence at different scale was accompanied by a change of distribution type.Korean pine was more clustered at regional scale(ROC=78.6%) than at local scale(74.4%),and its proportion increased in Fenglin Natural Reserve.Fir and spruces clustered at regional scale,but approached random distribution at local scale(ROC60%),i.e.,they occurred everywhere.Larch,the dominant species in the north,became more clustered at local scale(ROC increased from 71.7 to 82.0%) and was restricted to sites such as valleys.Scaling down from regional to local scale resulted in the changes of the most important factors affecting species distribution.Most species were sensitive to climatic factors at regional scale and geographic factors at local scale;however,larch was always the most sensitive to geographic factors due to the temperature inversion in the region.