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首页> 外文期刊>Journal of oceanography >The self-thinning exponent in overcrowded stands of the mangrove, Kandelia obovata, on Okinawa Island, Japan
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The self-thinning exponent in overcrowded stands of the mangrove, Kandelia obovata, on Okinawa Island, Japan

机译：日本冲绳岛红树林Kandelia obovata过度拥挤的林分中的自我稀释指数

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Weller's allometric model assumes that the allometric relationships of mean area occupied by a tree s, i.e., the reciprocal of population density p, s (= 1/p = g_φ ? w~φ), mean tree height H(= g_θ ? w~θ) , and mean aboveground mass density d(= g_δ ? w~δ) to mean aboveground mass w hold. Using the model, the self-thinning line (w = K ? p~(-α)) of overcrowded Kandelia obovata stands in Okinawa, Japan, was studied over 8 years. Mean tree height increased with increasing w. The values of the allometric constant 9 and the multiplying factor go are 0.3857 and 2.157 m kg~(-θ), respectively. The allometric constant δ and the multiplying factor g_δ are -0.01673 and 2.685 m~(-3) kg~(1-δ), respectively. The S value was not significantly different from zero, showing that d remains constant regardless of any increase in w. The average of d, i.e., biomass density (w ? p/H), was 2.641 ± 0.022 kg m~(-3), which was considerably higher than 1.3-1.5 kg m~(-3) of most terrestrial forests. The self-thinning exponent α(= 1/ =1/{1 - (θ + δ)}) and the multiplying factor K(= (g_θ ? g_δ)~α) were estimated to be 1.585 and 16.18 kg m~(2α), respectively. The estimators θ and d are dependent on each other. Therefore, the observed value of θ + δ cannot be used for the test of the hypothesis that the expectation of the estimator θ + δ equals 1/3, i.e., α = 3/2, or 1/4, i.e., α = 4/3. The φ value was 0.6310, which is the same as the reciprocal of the self-thinning exponent of 1.585, and was not significantly different from 2/3 (t = 1.860, df= 191, p = 0.06429), i.e., α = 3/2. Thus the self-thinning exponent is not significantly different from 3/2 based on the simple geometric model. On the other hand, the self-thinning exponent was significantly different from 3/4 (t = 6.213, df= 191, p = 3.182 × 10~(-9)), i.e., α = 4/3. Therefore, the self-thinning exponent is significantly different from 4/3 based on the metabolic model.
机译：Weller的异度模型假定树的平均面积为s的异度关系，即人口密度p的倒数s（= 1 / p =g_φ？w〜φ），平均树高H（=g_θ？w〜 θ）和平均地上质量密度d（=g_δ？w〜δ）等于平均地上质量w hold。使用该模型，研究了日本冲绳地区过度拥挤的阔叶金盏花的自稀疏线（w = K？p〜（-α）），历时8年。平均树高随w的增加而增加。异速常数9和倍增系数go分别为0.3857和2.157m kg·（-θ）。倾角常数δ和乘积因子g_δ分别为-0.01673和2.685 m〜（-3）kg〜（1-δ）。 S值与零没有显着差异，表明d保持恒定，而与w的增加无关。 d的平均值，即生物量密度（w？p / H）为2.641±0.022 kg m〜（-3），大大高于大多数陆生森林的1.3-1.5 kg m〜（-3）。自稀疏指数α（= 1 / = 1 / {1-（θ+δ）}）和倍增系数K（=（g_θ？g_δ）〜α）估计为1.585和16.18 kg m〜 （2α）。估计器θ和d彼此相关。因此，θ+δ的观测值不能用于检验估计器θ+δ的期望等于1/3（即α= 3/2或1/4，即α= 4）的假设。 / 3。 φ值为0.6310，与自稀疏指数1.585的倒数相同，并且与2/3（t = 1.860，df = 191，p = 0.06429）无显着差异，即α= 3 / 2。因此，基于简单几何模型，自稀疏指数与3/2没有显着差异。另一方面，自稀疏指数与3/4（t ＝ 6.213，df ＝ 191，p ＝ 3.182×10〜（-9））显着不同，即α＝ 4/3。因此，基于代谢模型，自稀疏指数与4/3显着不同。

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