Arid Land Research Center, Tottori University, Hamasaka, Tottori, 680-0001, Japan.
Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi, 980-8572, Japan.
Sci Rep. 2022 Aug 22;12(1):14320. doi: 10.1038/s41598-022-17787-8.
In this study, we examined the abiotic and biotic factors controlling the dynamics of soil respiration (R) while considering the zonal distribution of plant species in a coastal dune ecosystem in western Japan, based on periodic R data and continuous environmental data. We set four measurement plots with different vegetation compositions: plot 1 on bare sand; plot 2 on a cluster of young Vitex rotundifolia seedlings; plot 3 on a mixture of Artemisia capillaris and V. rotundifolia; and plot 4 on the inland boundary between the coastal vegetation zone and a Pinus thunbergii forest. R increased exponentially along with the seasonal rise in soil temperature, but summer drought stress markedly decreased R in plots 3 and 4. There was a significant positive correlation between the natural logarithm of belowground plant biomass and R in autumn. Our findings indicate that the seasonal dynamics of R in this coastal dune ecosystem are controlled by abiotic factors (soil temperature and soil moisture), but the response of R to drought stress in summer varied among plots that differed in dominant vegetation species. Our findings also indicated that the spatial dynamics of R are mainly controlled by the distribution of belowground plant biomass and autotrophic respiration.
在这项研究中，我们根据周期性的 R 数据和连续的环境数据，考察了控制土壤呼吸（R）动态的非生物和生物因素，同时考虑了日本西部沿海沙丘生态系统中植物物种的地域分布。我们设置了四个具有不同植被组成的测量点：点 1 在裸露的沙地上；点 2 在一小群年轻的乌桕幼苗上；点 3 在艾蒿和乌桕的混合物上；点 4 在沿海植被带和黑松森林之间的内陆边界上。R 随土壤温度的季节性升高呈指数增长，但夏季干旱胁迫显著降低了点 3 和点 4 的 R。秋季地下植物生物量的自然对数与 R 呈显著正相关。我们的研究结果表明，该沿海沙丘生态系统中 R 的季节性动态受非生物因素（土壤温度和土壤水分）控制，但 R 对夏季干旱胁迫的响应因主要植被物种不同的样地而异。我们的研究结果还表明，R 的空间动态主要受地下植物生物量和自养呼吸的分布控制。
