Comparative modeling of the effects of intensive thinning on canopy interception loss in a Japanese cedar (Cryptomeria japonica D. Don) forest of western Japan
Comparative modeling of the effects of intensive thinning on canopy interception loss in a Japanese cedar (Cryptomeria japonica D. Don) forest of western Japan
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DOI：
10.1016/j.agrformet.2015.08.257
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发表时间：
2015-12
影响因子：
6.2
通讯作者：
Yoshinori Shinohara;D. Levia;H. Komatsu;M. Nogata;K. Otsuki
中科院分区：
文献类型：
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作者：
Yoshinori Shinohara;D. Levia;H. Komatsu;M. Nogata;K. Otsuki
近年来，日本各地的针叶林都进行了间伐，主要是为了确保水资源。虽然冠层截留损失 (Ic) 是蒸散量的主要组成部分，但这是首批研究 Ic 变化的研究之一，同时考虑了日本雪松 (Cryptomeria japonica) 森林（日本最常见的人工林类型）间伐的影响。我们比较和对比了密集间伐操作前后的三种冠层拦截模型（Mulder、修订版 Gash、WiMo）。实验性的日本雪松林被密集间伐，去除了 54% 的所有茎，使断面积从 99.7 m2ha−1 减少到 49.6 m2ha−1，减少了 50%。在稀疏化之前，所有三种冠层拦截模型均表现良好，Mulder、修订后的 Gash 和 WiMo 模型的均方根误差分别为 2.96、3.59 和 3.81 毫米；减薄后的厚度分别为 1.32、2.37、2.38 毫米。此外，根据 Nash-Sutcliffe 模型效率评估，所有三个冠层拦截模型的表现均优于稀疏化之前的平均值，值为 0.51 (Mulder)、0.28 (修订版 Gash) 和 0.19 (WiMo)，但在严重稀疏化后表现不佳。这些结果表明，在日本雪松林密集间伐后，树冠拦截模型可能不再适用。
In the last several years, thinning has been conducted in coniferous plantations throughout Japan, mainly to secure water resources. Although canopy interception loss (Ic) is a major component of evapotranspiration, this is among the first studies that have examined changes inIcwhile considering the effects of thinning in Japanese cedar (Cryptomeria japonica) forests, the most common type of plantation in Japan. We compared and contrasted three canopy interception models (Mulder, revised Gash, WiMo) before and after intensive thinning operations. The experimental Japanese cedar forest was intensively thinned with removal of 54% of all stems, reducing the basal area by 50% from 99.7 to 49.6 m2ha−1. Prior to thinning, all three canopy interception models performed well with root mean square errors for the Mulder, revised Gash, and WiMo models of 2.96, 3.59, and 3.81 mm, respectively; while those after thinning were 1.32, 2.37, 2.38 mm, respectively. In addition, all three canopy interception models performed better than the mean before thinning as evaluated by the Nash–Sutcliffe model efficiency with values 0.51 (Mulder), 0.28 (revised Gash), and 0.19 (WiMo) but did not perform as well after heavy thinning. These results suggest that canopy interception models might not be applicable after intensive thinning of Japanese cedar forests.