文献类型：期刊文献

英文题名：Analyzing the Uncertainties in Use of Forest-Derived Biomass Equations for Open-Grown Trees in Agricultural Land

作者：Zhou, Xinhua[1] Schoeneberger, Michele M.[2] Brandle, James R.[1] Awada, Tala N.[1] Chu, Jianmin[3] Martin, Derrel L.[4] Li, Jihong[5] Li, Yuqiang[6] Mize, Carl W.[]

第一作者：Zhou, Xinhua

通信作者：Zhou, XH[1]

机构：[1]Univ Nebraska, Sch Nat Resources, Lincoln, NE 68583 USA;[2]US Forest Serv, USDA, Natl Agroforestry Ctr, Eastern Ctr, CA USA;[3]Chinese Acad Forestry, Res Inst Forestry, State Forestry Adm, Key Lab Tree Breeding & Cultivat, Beijing, Peoples R China;[4]Univ Nebraska, Dept Biol Syst Engn, Lincoln, NE 68583 USA;[5]Northeast Forestry Univ, Sch Forestry, Dept Forest Management, Harbin, Heilongjiang, Peoples R China;[6]Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Beijing 100864, Peoples R China

年份：2015

卷号：61

期号：1

起止页码：144-161

外文期刊名：FOREST SCIENCE

收录：;EI(收录号：20150800539190);Scopus(收录号：2-s2.0-84922810360);WOS:【SCI-EXPANDED(收录号:WOS:000349590100016)】；

基金：This research was supported in part by funds provided through the USDA Forest Service (Agreement 10-JV-11330152-045), the USDA Forest Service, Southern Research Station, the McIntyre-Stennis Forestry Research Program, the USDA/Cooperative State Research Service National Research Initiative (Competitive Grant 2001-35108-10205), the National Natural Science Foundation of China (31370707), and Montana Watershed, Inc. We appreciate the field help of K.A. and C.L. Messenger and personnel in the Montana and Nebraska Natural Resource Conservation Service field offices as well as the editorial work by the supporting staff of R. Carman and N. Hammond at the USDA National Agroforestry Center. We thank the associate editor and the three anonymous reviewers for their helpful comments.

语种：英文

外文关键词：agroforestry; Austrian pine; carbon sequestration; eastern redcedar; green ash; windbreak

摘要：Quantifying carbon in agroforestry trees requires biomass equations that capture the growth differences (e.g., tree specific gravity and architecture) created in the more open canopies of agroforestry plantings compared with those generally encountered in forests. Whereas forest-derived equations are available, equations for open-grown trees are not. Data from destructively sampled open-grown trees in the Northern Great Plains were used to examine the uncertainties in the use of forest-derived equations for open-grown trees. Three species, representative of major morphological types of agroforestry trees, were studied: green ash, Austrian pine, and eastern redcedar. Forest-derived equations provided good estimates of trunk biomass at lower diameter ranges but, as diameter increased, resulted in overestimation up to 40% for individual trees. Across the full diameter ranges, individual tree branch biomass was underestimated by 29-82%, depending on species and equation source (regional or nonregional). Although open-grown trunk and branch biomass curves diverged down and up, respectively, from their forest-derived counterparts, those for the whole tree tended to converge, albeit significantly above the forest-derived curves. Whole-tree biomass for individual trees was underestimated by at least 18%. To correct the biases, we studied the adjustment factor of forest- to open-grown tree biomass. It shows a power function with diameter. On a whole-tree basis, it was evaluated as a constant (1.2) independent of species and diameters. Application of this constant factor adjusted the biomass underestimation of three-species-mixed plantation by forest-derived equations from 2110 4.6%, providing a cost-efficient approach to use forest-derived equations for open-grown trees in agriculture land.