毛乌素沙地4种灌木地上构件生物量和碳分布特征

Distribution characteristics of biomass and carbon of aboveground modules of four shrubs in Mu Us sandy land

采用收割法、烘干法、湿烧法对毛乌素沙地4种灌木地上构件的生物量、含水率、含碳率进行了测量,结果表明,4种灌木地上构件含水率差异较大;4种灌木的主枝含碳率均较低,构件含碳率分布具有随机性,由植物自身生理生态特性控制;4种灌木构件生物量密度和碳密度大于草本植物,含碳率大于杨柳类阔叶乔木;4种灌木均表现为主枝生物量和碳分配最大,主枝是4种灌木储存碳的主要构件和构成种群的主要构件。4种灌木构件生物量和碳分布特点反映了植物在干旱环境中能够很好地吸收固定二氧化碳,在干旱半干旱地区应以臭柏等耐旱、含碳率高的灌木为主要树种进行碳汇林建设。

The biomass, rate of water content, carbon contend rate of aboveground modules of four shrubs in Mu Us sandy land were measured respectively by harvesting, oven drying, potassium dichromate-sulfuric acid oxidation. There were four results as follows： （ 1 ）The water content rate among aboveground modules of four shrubs had significant differences and were in line with the general law of plants water. （2）The carbon content rate of main breaches were low, randomness carbon content distribution among modules were controlled by eco-physiological characteristics of plant. （3） The biomass density and carbon density of four shrubs were more than herbaceous species, rate of carbon content than trees like poplar and willow. （4） The main breach of four shrubs all had more rate of biomass and carbon than other modules, so that it was the main module that stores carbon and constitutes population. Characteristics of biomass and carbon distribution of four shrubs reflected that plants in arid and semi arid regions distribute biomass reasonably to get the maximum resources and space for population living. For this, the shrubs with high carbon content rate such as Sabina vulgaris should be the main trees for carbon sink forests construction.