非采伐性的收获预测模型

本文通过对全英国超短轮伐萌生林地上生物量的研究，建立了预估枝条生物量的通用模型。分别不同年龄的柳树和杨树无性素在不同地区抽取了１９个数据系列。对各无性系分别１年生，２年生和４年生的柳树建立了模型，对１到４年生柳树和３年生杨树也建立了通用模型从准确度和相关系数方面对这些模型进行了比较。胸径是预测板条干重的最佳的独立变量。建立了一个积性无截距通用模型来预估柳树和杨树所有的无性系的生物量，通过对新从１到

studies on Soil Microoganisms and Biochemical Properties in Mixed Forests of Chinese Fir

A general model was sought to estimate the shoot biomass of shortrotation coppice crops in the UK,Different aged shoots of willow andpoplar clones were sampled from different sites to produce 19 data sets. Models were created for each clone,separately for 1-,2-and 4-year oldwillow,and general models for 1 to 4 year willows,and 3 year old poplars. The models were compared with regard to accuracy and correlation coeffici- ent. The diameter at breast height was chosen as the best independent var-iable to estimate the shoot weight.A general multiplicative model withoutintercept was created for all the willows and poplars sampled.The modelwas evaluated and was found to have average accuracy of 92%when testedwith new data from 1-,and 3-year old willow clones.The model requiresfurther validation.