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Establishing grassland yield models using Projection Pursuit Regression Method | |
Li, JL; Qi, JG; Zhao, DJ; Jiang, P; Xu, S | |
通讯作者 | Jiang, P |
来源期刊 | NEW ZEALAND JOURNAL OF AGRICULTURAL RESEARCH
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ISSN | 0028-8233 |
EISSN | 1175-8775 |
出版年 | 2005 |
卷号 | 48期号:1页码:47-55 |
英文摘要 | There is a great deal of interest in grassland yields as they are a required component in the calculation of carrying capacity, which is very important in grassland management practices. Traditional approaches to yield information are often time-consuming, expensive, and limited in areal samplings. It is therefore desirable to develop new methods that can provide quick, easy, and costeffective estimates of grassland yields over large areas. In this study, an experiment was conducted at Fukang County, Xinjiang, China, to collect in situ data and remote sensing imagery. The in situ data included green herbaceous forage yields and weather information at four grassland types (plain desert, saline steppe, hill desert steppe, and mountain meadow), while the remote sensing images were acquired by the Landsat satellite TM sensors at 30m resolution. Analysis of this dataset resulted in the development of a yield model using the Projection Pursuit Regression (PPR) method. The PPR model was compared with traditional multivariate linear statistical methods and was found to be much more accurate in estimating grassland yields. When applied to the four grassland types, the PPR models resulted in an accuracy of 81.76, 88.61, 83.50, and 92.35% for plain desert, saline steppe, hill desert steppe, and mountain meadow, respectively. Therefore, the new PPR model has the potential to provide an effective method to estimate grassland yields over large geographic areas. |
英文关键词 | grassland estimated grassland yield Projection Pursuit Regression Method PPR model assessment of grassland resources |
类型 | Article |
语种 | 英语 |
国家 | Peoples R China ; USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000229010700006 |
WOS类目 | Agriculture, Multidisciplinary |
WOS研究方向 | Agriculture |
来源机构 | 南京大学 |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/150047 |
作者单位 | (1)Nanjing Univ, Dept Biol Sci, Nanjing 210093, Peoples R China;(2)Michigan State Univ, Ctr Global Change & Earth Observat, E Lansing, MI 48823 USA |
推荐引用方式 GB/T 7714 | Li, JL,Qi, JG,Zhao, DJ,et al. Establishing grassland yield models using Projection Pursuit Regression Method[J]. 南京大学,2005,48(1):47-55. |
APA | Li, JL,Qi, JG,Zhao, DJ,Jiang, P,&Xu, S.(2005).Establishing grassland yield models using Projection Pursuit Regression Method.NEW ZEALAND JOURNAL OF AGRICULTURAL RESEARCH,48(1),47-55. |
MLA | Li, JL,et al."Establishing grassland yield models using Projection Pursuit Regression Method".NEW ZEALAND JOURNAL OF AGRICULTURAL RESEARCH 48.1(2005):47-55. |
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