Improving gap light index (GLI) to quickly calculate gap coordinates
文献类型：期刊论文
| 作者 | Hu, LL; Zhu, JJ; Zhu, JJ, Chinese Acad Sci, Inst Appl Ecol, Wenhua Rd 72, Shenyang 110016, Peoples R China |
| 刊名 | CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE
 |
| 出版日期 | 2008 |
| 卷号 | 38期号:9页码:2337-2347 |
| ISSN号 | 0045-5067 |
| 英文摘要 | Understory light is essential to the establishment and growth of understory plants and varies temporally and spatially within gaps. The previously defined gap light index (GLI) is a good model for assessing understory light levels, but it is time-consuming to determine gap coordinates, which are crucial to GLI, for numerous points within a gap. This paper introduces the geometric calculation (GeoCalc) of gap coordinates. GeoCalc quickly obtains gap coordinates for any specified point within a canopy gap and takes into account the tridimensional profile of the gap and the slope and aspect of the ground. The GeoCalc-based GLI was validated by the GLI derived from hemispherical photographs taken at 93 sampling points within seven natural gaps. Our results demonstrate that GeoCalc-based GLI was strongly positively correlated and not significantly differed from the GLI derived from hemispherical photographs. Next, to analyze gap light regimes and the effects of gap size, canopy height, and topography, three natural gaps of various size were selected and simulated as nine gaps with 1 and 1.5 times canopy height or on the opposite slope. Finally, we have summarized characteristics of GeoCalc-based GLI and its application. |
| 学科主题 | Forestry |
| 语种 | 英语 |
| WOS记录号 | WOS:000259879600001 |
| 资助机构 | National Natural Science Foundation of China [30671669]; Chinese Academy of Sciences |
| 公开日期 | 2011-09-23 |
| 源URL | [http://210.72.129.5/handle/321005/54359]  |
| 专题 | 沈阳应用生态研究所_沈阳应用生态研究所 |
| 通讯作者 | Zhu, JJ, Chinese Acad Sci, Inst Appl Ecol, Wenhua Rd 72, Shenyang 110016, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hu, LL,Zhu, JJ,Zhu, JJ, Chinese Acad Sci, Inst Appl Ecol, Wenhua Rd 72, Shenyang 110016, Peoples R China. Improving gap light index (GLI) to quickly calculate gap coordinates[J]. CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE,2008,38(9):2337-2347. |
| APA | Hu, LL,Zhu, JJ,&Zhu, JJ, Chinese Acad Sci, Inst Appl Ecol, Wenhua Rd 72, Shenyang 110016, Peoples R China.(2008).Improving gap light index (GLI) to quickly calculate gap coordinates.CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE,38(9),2337-2347. |
| MLA | Hu, LL,et al."Improving gap light index (GLI) to quickly calculate gap coordinates".CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE 38.9(2008):2337-2347. |
入库方式： OAI收割
来源：沈阳应用生态研究所
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