摘要
开展全国森林生物量监测和评估,建立适合较大区域范围的通用性立木生物量模型将成为必然趋势。从建立全国立木生物量模型的实际需求出发,对建模样本数据的采集方法进行专题研究。首先,在文献调研的基础上,对国内外相关研究和应用现状进行了综述。然后,结合大范围应用的实际情况,提出立木生物量建模样本的数据采集方法,其中:树干按上、中、下3个部分测量鲜重,再分别在1/10、3.5/10、7/10树高处各取2个圆盘样品测含水率;树冠分上、中、下3层测量鲜重,并分层各抽取3个标准枝测定枝、叶比例,再在各层标准枝(不含叶)和全部标准枝的树叶中抽取含水率测定样品;树根按全挖法测定鲜重,再分树蔸(树桩)、粗根(≥10 mm)、细根(<10 mm)抽取含水率测定样品。最后,提出样本数据处理和计算的有关方法。研究成果为全国立木生物量建模样本采集提供技术依据。
To implement monitoring and assessment of national forest biomass, it is becoming the trend to develop generalized single-tree biomass models suitable for large-scale forest biomass estimation. The sample collection approach for modeling of single-tree biomass equations was studied in this paper. Firstly, based on the review of related literatures, the methods of sample collection in field and dry-weight measurement in laboratory were summarized. Secondly, considering the situation being applied all over the country, the sample collection approach was presented： the stem being weighted by three （lower, middle, and upper） sections, and 2 disks being selected from the trunk on each point of 1/10, 3.5/10, 7/10 tree height for moisture content measurement; the crown being weighted by three （lower, middle, and upper） layers, and 3 standard branches being selected in each layers to determine the leafless branch/foliage ratio, and sub-samples being selected from the standard branches （not including foliage） in each of the three layers and from the foliage of all three layers for moisture content measurement; the roots being excavated wholly and weighted, then sub-samples being selected from stump, coarse root （≥10 mm）, and fine root （〈10 mm） respectively. Finally, the method of data processing and computation was provided. The approach was recommended to be technical guidelines for the sample collection for modeling of generalized single-tree biomass equations in China.
出处
《中南林业调查规划》
2010年第2期1-6,共6页
Central South Forest Inventory and Planning
关键词
立木生物量建模
样本采集
分层抽样
地上生物量
粗根生物量
single-tree biomass equation modeling
sample collection
stratified sampling
above-ground biomass
coarse root biomass
