大兴安岭地区落叶松林碳密度空间分布

Spatial Distribution of Carbon Density for Larch Forest in Daxing'an Mountain

以黑龙江省大兴安岭地区落叶松天然林为研究对象，利用65株生物量样木的含碳率测定数据．以及2005—2010年复测的285块固定样地数据，采用克里格（Kriging）插值法，基于AreGIS平台分析了该地区落叶松林碳密度及其空间分布特征。研究结果表明：落叶松林碳密度的变化范围为1．2～101．1t／hm2．平均值为37．0t/hm2。落叶松林乔木（全树）、地上（干、枝、叶）和地下（根）部分碳密度在海拔901～1100m内最大：落叶松林碳密度在不同坡位上的分布规律从大到小顺序为：上坡、脊、中坡、下坡、谷、平地。落叶松林各部分碳密度在斜坡（坡度15°～24°）最大，乔木和地上部分在平坡（坡度〈5。）最小。而地下部分在陡坡（坡度25°～34°）时最小：落叶松林碳密度在不同坡向上的分布规律从大到小顺序为：阳坡、无坡向、半阴坡、半阳坡、阴坡。大兴安岭地区落叶松林年平均固碳量为1．05t·hm-2·a-1，其中地上部分年平均固碳量为0．81t·hm-2·a-1．地下部分年平均固碳量为O．24t·hm-2·a-1．

With the data of carbon content rates for 65 biomass sample trees and 285 permanent sample plots from natural larch forest of 2005-2010 in the Daxing＇ an Mountain of Heilongjiang Province, we measured the carbon density and spatial distribution for Larch forests by Kriging spatial interpolation and ArcGIS spatial analysis. The carbon density of larch forest is 1.2 t/hm2-101.1 t/hm2 with the mean of 37.0 t/hm2. The forest carbon density of total tree, aboveground, and under- ground （roots） reaches the maximum at 901-1 100 m asl. The distribution of the carbon density for larch forest at different slope position is uphili〉ridge〉middle〉downhill〉valley〉flat. The maximum of carbon density for three part is at the slope of 15°～24° and the maximum is at 〈5° for total tree and aboveground, and 25°～34° for underground. The distribution at different slope aspect is sunny-slope〉none〉half shady-slope〉half sunny-slope〉shady-slope. In the Daxing＇ an Mountain, the mean carbon sequestration of larch forest per year for total tree, aboveground and underground are 1.05, 0.81 and 0.24 t/hm2, respectively.