Sustained growth suppression in forest-floor seedlings of Sakhalin fir associated with previous-year springtime photoinhibition after a winter cutting of canopy trees
Sustained growth suppression in forest-floor seedlings of Sakhalin fir associated with previous-year springtime photoinhibition after a winter cutting of canopy trees
复制标题
冬季砍伐冠层树木后，库页岛冷杉林地幼苗的持续生长抑制与前一年春季光抑制有关
DOI：
10.1007/s10342-018-1159-3
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发表时间：
2019
影响因子：
2.8
通讯作者：
Ishibashi Satoshi
中科院分区：
文献类型：
--
作者：
Kitao Mitsutoshi;Kitaoka Satoshi;Harayama Hisanori;Agathokleous Evgenios;Han Qingmin;Uemura Akira;Furuya Naoyuki;Ishibashi Satoshi
春季光抑制在1岁的枝条，加剧了在冬季皆伐，最近发现，以减少当年的萨哈林冷杉（冷杉sachalinensis）的林下幼苗的枝条生长。在本研究中，我们进行了跟踪调查，在第二年在这些幼苗，这是受到不同的砍伐率的冠层树木（100：皆伐，66，50，30，和0%：控制）在前一年的春天。在春、夏两季扦插后形成的1年生针叶中，不同扦插率的样地均未观察到光抑制现象（Fv/Fm> 0.8）。初夏测得的当年生枝干质量与1年生针叶干质量的比值（Shootcurrent/Needle 1-year）作为1年生针叶光合碳增益的指标，在排除皆伐地数据后，随生长光照的增加而呈增加趋势，但差异较大。在Shootcurrent/Needle 1-yearwithin皆伐网站的变化可以解释的剩余量的2岁的针叶，这表明，落叶的2岁的针叶光抑制在前一年春天损坏可能与持续抑制当前拍摄的增长，甚至在第二年。
Springtime photoinhibition in 1-year-old shoots, exacerbated by a clear-cutting during winter, was recently found to reduce the current-year shoot growth of forest-floor seedlings of Sakhalin fir (Abies sachalinensis). In the present study, we conducted a follow-up survey in the following year in these seedlings, which were subjected to different cutting rates of canopy trees (100: clear-cutting, 66, 50, 30, and 0%: control) in the previous spring. No photoinhibition (Fv/Fm≈ 0.8) was observed in the 1-year-old needles, developed after the cuttings in spring and summer, across the sites with different cutting rates. The ratio of current-shoot dry mass to 1-year-old needle dry mass (Shootcurrent/Needle1-year) measured in early summer, as a measure of photosynthetic carbon gain in the 1-year-old needles, showed an increasing trend with increasing growth irradiance when excluding the data of clear-cutting sites, which had a large variation. The variation in Shootcurrent/Needle1-yearwithin the clear-cutting sites can be explained by the remaining amount of 2-year-old needles, which suggests that defoliation of 2-year-old needles damaged by photoinhibition in the previous spring may associate with a sustained suppression in the growth of current shoot even in the second year.