宁南黄土丘陵26年生主要人工灌木林碳密度及其分配特征  

Carbon Density and Its Allocation Characteristics of 26-year-old Major Shrub Plantations in Hilly Loess Plateau,South Ningxia

作　　者：刘涛 

机构地区：[1]中共商丘市委党校经济学教研部,河南商丘476000

出　　处：《安徽农业科学》2018年第4期103-105,共3页Journal of Anhui Agricultural Sciences

基　　金：国家自然科学基金面上项目(41271518);中科院战略性先导科技专项(XDA05060300)

摘　　要：[目的]基于宁南黄土丘陵区26年生主要人工灌木林样地调查数据,分析林地碳密度及其分配规律,以期为该地区人工灌木林碳效益估算提供基础数据。[方法]在宁夏隆德县退耕还林实施区,选择26年生沙棘(Hippophae rhamnoides)、柠条(Caragana korshinskii)和山毛桃(Prunus davidiana)灌木林设置样地,测算灌木层、草本层的生物量,并取0~100 cm土层土样,测定不同土层土壤体积质量,计算灌木层、草本层和土壤层的碳密度,分析3种灌木林各组分及土壤碳密度的变化。[结果]沙棘、柠条、山毛桃林地碳密度分别为56.30、74.20和117.44 t/hm2,其碳密度的空间分布格局基本一致,即土壤层碳密度所占比例最大,分别占84.10%、74.49%和84.82%;其次为灌木层,所占比例分别为15.03%、25.15%和15.00%;草本层所占比例最小,分别为0.78%、0.36%和0.17%。沙棘、柠条和山毛桃0~10 cm土层碳密度分别为50~100 cm土层碳密度的1.84、2.50和3.48倍。[结论]灌木层是植被碳密度的主体;土壤碳密度随土层深度的增加而下降;土壤碳库是林地碳密度的主体。[Objective] Based on data obtained from a survey of sample plots of 26-year-old major shrub plantations,carbon density and their distribution patterns were analyzed,aiming at providing the basic data for estimation of carbon benefits of the plantations in Loess Plateau in south Ningxia. [Method] Based on shrub layer biomass,herb layer biomass,soil samples from 0-100 cm layers of plots,carbon density and its variation of each component of H. rhamnoides,C. korshinskii and P. davidiana shrub plantations in afforestation area of Longde country,Ningxia were quantified. [Result]The results showed that forest carbon density of Hippophae rhamnoides,Caragana korshinskii and Prunus davidiana were 56. 30,74. 20 and 117. 44 t/hm2,respectively,the carbon density spatial distribution pattern was consistent,namely the carbon density of soil layer accounted for the largest proportion,respectively 84. 10%,74. 49% and 84. 82%; followed by the shrub layer,the proportion was 15. 03%,25. 15% and 15%; the smallest proportion of herbaceous layer were 0. 78%,0. 36% and 0. 17%. 0-10 cm soil layer carbon densities of Hippophae rhamnoides,Caragana korshinskii,and Prunus davidiana were 1. 84,2. 50 and 3. 48 times that of 50-100 cm soil layer,respectively. [Conclusion]Shrub layer is the majority of vegetation carbon density. Carbon density in soil layer decreased with soil depth increasing. Soil carbon pool is the majority of forest carbon density.

关 键 词：沙棘 柠条 山毛桃 碳密度 黄土丘陵区 

分 类 号：S714.5[农业科学—林学]