USE OF HEMISPHERICAL PHOTOGRAPHS IN FOREST ECOLOGY - MEASUREMENT OF GAP SIZE AND RADIATION TOTALS IN A BORNEAN TROPICAL RAIN-FOREST

被引：116

作者：

WHITMORE, TC

BROWN, ND

SWAINE, MD

KENNEDY, D

GOODWINBAILEY, CI

GONG, WK

机构：

[1] Department of Plant Sciences, Oxford University

[2] Department of Plant and Soil Science, Aberdeen University

来源：

JOURNAL OF TROPICAL ECOLOGY | 1993年 / 9卷

基金：

英国自然环境研究理事会;

关键词：

BORNEO; FOREST CANOPY GAPS; FOREST LIGHT CLIMATE; HEMISPHERICAL PHOTOGRAPHS; PHOTOSYNTHETICALLY ACTIVE RADIATION;

D O I：

10.1017/S0266467400007112

中图分类号：

Q14 [生态学（生物生态学）];

学科分类号：

071012 ; 0713 ;

摘要：

Study of forest dynamics commonly requires measurement of canopy gap size. Hemispherical photographs can be analysed to provide various measures whereby gaps can be ranked in order of size. For ten artificial gaps in a Bornean tropical rain forest these measures were better correlated with gap microclimate than gap area measured physically on the ground. All these measures are however relative. For detailed (e.g. ecophysiological) studies the greater detail provided by absolute measures of photosynthetically active radiation (PAR) are required. Long term PAR values can be computed from hemiphots so long as measurements in the open nearby are available. Correction for cloudy weather is essential. Computed and measured PAR are compared for the test gaps. Both have inherent limits which means that below c. 15% canopy openness, differences in PAR between gaps cannot be assessed accurately.

引用

页码：131 / 151

页数：21

共 31 条

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