Reconstructing past structure and nitrogen accumulation of free populations, and test of its accuracy

重建自由种群过去的结构和氮积累及其准确性

基本信息

批准号：
12640623
负责人：
OSAWA Akira
金额：
$ 2.18万
依托单位：
Ryukoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640623/
关键词：
biomass structural reconstructions fertilization experiment stem analysis allometry nitrogen Todo fir

项目摘要

We tested accuracy of the method for structural and functional reconstruction of tree populations from the existing samples, by applying this technique to a 26-year-old plantation of Todo-fir, and comparing the estimated and observed structures of the forests. Sampling was done in Oct. 2000, at a fertilization experiment plots in Hitsujigaoka Exp. Forest in Sapporo. Tree dbh, height and crown length etc. were measured in both control and annually fertilized plots. Then ten trees were felled, and their plant-part biomass values were measured. Stem discs were taken for estimation of sapwood areas. Discs were also collected for stem analysis for estimation of stem volume and growth. Additional sampling was done in Oct. 2001. Then, all samples were analyzed together to develop allometric relationships between tree size and plant part, growth, etc. Tree samples were also collected for analysis of nitrogen concentration: they were dried, ground, then analyzed with the N-C analyzer for N concentration. Time series data of dbh exists for individual trees in the studied stands. With the additional information of tree allometry, we estimated for the total stands, plant-part biomass, leaf area, their growth etc. For the years without plot data, we applied the stand reconstruction method of Osawa et al. (2000), and total stand structure and nitrogen content were estimated. Also analyzed for this calculation were relationships between stem nitrogen concentration vs. sapwood volume, sapwood volume vs. tree size, and stem size distribution. We published two original papers on accuracy of estimates in the theory of stand reconstruction.

我们测试了从现有样本中重建树群结构和功能的方法的准确性，通过将该技术应用于一个 26 年树龄的红杉人工林，并比较估计的和观察到的森林结构。取样于 2000 年 10 月在羊之丘实验田的施肥试验田进行。札幌的森林。在对照和每年施肥的地块中测量了树木胸径、高度和冠长等。然后砍伐十棵树，测量它们的植物部分生物量值。采取茎盘来估计边材面积。还收集圆盘用于茎分析，以估计茎体积和生长。 2001 年 10 月进行了额外取样。然后，对所有样品进行了分析，以建立树木大小和植物部位、生长等之间的异速生长关系。还收集了树木样品用于氮浓度分析：将它们干燥、研磨，然后进行分析用 N-C 分析仪测定 N 浓度。研究林分中的单株树木存在胸径时间序列数据。借助树木异速生长的附加信息，我们估算了总林分、植物部分生物量、叶面积、生长等。对于没有样地数据的年份，我们应用Osawa等人的林分重建方法。 (2000)，并估计了总林分结构和氮含量。该计算还分析了茎氮浓度与边材体积、边材体积与树木尺寸以及茎尺寸分布之间的关系。我们发表了两篇关于林分重建理论估计准确性的原创论文。