The applicability of a color acetate film for estimating photosynthetic photon flux density in a forest understory
The applicability of a color acetate film for estimating photosynthetic photon flux density in a forest understory
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DOI：
10.1007/s10310-004-0141-8
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发表时间：
2005-06-01
影响因子：
1.5
通讯作者：
Takeda, H
中科院分区：
文献类型：
--
作者：
Kawamura, K;Cho, M;Takeda, H
研究了彩色醋酸盐膜用于估算林下植物光合光子通量密度（PPFD）的适用性。通过在天然次生林（n = 42）内全年多个采样点的测量获得薄膜的褪色率（F）、薄膜暴露的总PPFD（PPFD总）和暴露期间的平均日最高温度（T）。记录值的范围如下：F 35%-99%，PPFD总1.4-28.3 mol m（-2），和T 6 ℃-32 ℃。F和T对PPFD总的回归具有较高的r（2）（=0.94; P < 0.0001）：PPFD总=（100 - F）/（1.085 + 0.051 T）。绝对误差（垂直条估计的PPFD总-测量的PPFD总垂直条）平均为1.3 mol m（-2），最大值为5.7 mol m（-2），表明拟合良好。这些结果表明，广泛的适用性的电影，在空间和时间上，估计森林林下PPFD。
The suitability of a color acetate film for estimating photosynthetic photon flux density (PPFD) in a forest understory was examined. The fading ratio of the film (F), the total PPFD (PPFDtotal) to which the film was exposed, and the average daily maximum temperature during exposure (T) were obtained from measurements at multiple sampling points throughout an entire year within a natural secondary forest (n = 42). The ranges of the recorded values were as follows: F35%-99%, PPFDtotal 1.4-28.3 mol m(-2), and T 6 degrees-32 degrees C. PPFDtotal was regressed by F and T with a high r(2) (=0.94; P < 0.0001): PPFDtotal = (100 - F)/(1.085 + 0.051 T). The absolute error (vertical bar estimated PPFDtotal - measured PPFDtotal vertical bar) averaged 1.3 mol m(-2) with a maximum of 5.7 mol m(-2), indicating a good fit. These results indicated broad applicability of the film, both spatially and temporally, for estimating forest understory PPFD.