Zhang Xiulong, Li Hao, Hu Xiaoxing, Zheng Pengyao, Hirota Mitsuru, Kamijo Takashi
Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8572, Japan.
Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8572, Japan.
Plants (Basel). 2020 Sep 16;9(9):1212. doi: 10.3390/plants9091212.
How photosynthetic-related leaf traits of non-nitrogen (N)-fixing pioneer species respond to extreme habitat conditions of primary succession is still not well-elucidated, especially in volcanically N-deplete habitats. The effect of N-deplete soil on photosynthetic-related leaf traits can provide a basis for predicting how plants adjust their strategies to adapt to such habitats. To examine the responses of leaf traits to extreme conditions, we investigated (a non-N-fixing C pioneer grass) which grows on a volcanically devastated area on Miyake-jima Island, Japan, in which the volcanic ash has been deposited for 17-18 years since the 2000-year eruption. Leaf N content (N), light-saturated photosynthetic rate (A), and photosynthetic N use efficiency (PNUE) in three contrasting study sites: bare land (BL), shrub land gap (SLG), and shrub land under canopy (SLUC) were determined. Results indicated that compared to previous studies and internal comparison of Miyake Island, in BL was able to maintain a relatively high A, N and PNUE. The higher A was in part a result of the higher PNUE. This is a characteristic necessary for its successful growth in N-deplete soils. These results suggest that has photosynthetic-related advantages for adaptation to volcanically N-deplete habitats.
非固氮先锋物种与光合作用相关的叶片性状如何响应原生演替的极端生境条件，目前仍未得到充分阐明，尤其是在火山氮贫瘠生境中。氮贫瘠土壤对与光合作用相关的叶片性状的影响可为预测植物如何调整其策略以适应此类生境提供依据。为了研究叶片性状对极端条件的响应，我们调查了生长在日本三宅岛火山破坏地区的（一种非固氮C3先锋草），自2000年火山喷发以来，该地区火山灰已沉积了17 - 18年。测定了三个对比研究地点：裸地（BL）、灌木林间隙（SLG）和林下灌木林（SLUC）的叶片氮含量（N）、光饱和光合速率（A）和光合氮利用效率（PNUE）。结果表明，与之前的研究以及三宅岛的内部比较相比，BL中的A、N和PNUE能够保持相对较高水平。较高的A部分归因于较高的PNUE。这是其在氮贫瘠土壤中成功生长所必需的特征。这些结果表明，在适应火山氮贫瘠生境方面具有与光合作用相关的优势。
