Nutrition and mycorrhizae affect interspecific patterns of seedling growth on coarse wood and mineral soil substrates
Nutrition and mycorrhizae affect interspecific patterns of seedling growth on coarse wood and mineral soil substrates
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营养和菌根影响粗木和矿质土壤基质上幼苗生长的种间模式
DOI：
10.1002/ecs2.2350
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发表时间：
2018
期刊：
影响因子：
2.7
通讯作者：
M. Walters
中科院分区：
文献类型：
--
作者：
J. L. Willis;M. Walters
种子较小的树种通常需要矿物质土壤和粗木质残体（CWD）来建立。有限的数据表明，树木幼苗-CWD关系存在基于物种的变化;然而，这种模式的普遍性及其机制基础仍然未知。我们调查种间基质幼苗的关系和潜力，菌根状态和基质营养的差异，这些模式与盆栽试验。八个温带树种生长在板条遮荫房子上的6种CWD和矿质土壤，要么已灭菌与γ射线照射或未经处理的分离真菌的影响，从基板营养。我们评估了基质身份对高度生长的影响，并通过将生长与基质无机氮浓度、幼苗叶片氮（%）和菌根定植相关来研究可能的机制。幼苗高度在物种之间一致地在基质上变化（即，基质效应很强，但幼苗种与基质的相互作用很弱）。幼苗在矿质土上生长最快，其次是纸桦和崖柏，最短的是黑根槭和糖槭。灭菌处理对幼苗株高的主效应不显著，但不同树种对灭菌处理的反应不同，在灭菌处理的基质上，红槭和北美赤杨幼苗的株高显著降低。对于所有的幼苗品种，生长与基质[N]和叶片N呈正相关。在四种真菌中，矿质土壤上的根定殖密度最高，而甘蔗和阿氏芽孢杆菌CWD上的根定殖密度最低。对于这些物种，平均定殖密度是更强烈地与平均苗高比基板无机[N]。有益的菌根效应，建议为B. alleghaniensis，A. rubrum，和T. occurentalis的高度菌根根密度的正关系。总的来说，对于本研究中检查的北方硬木树种组，这些结果表明，在受控环境中，大多数树种在矿质土壤上生长最好，B. alleghaniensis和Picea glauca在CWD上获得最大生长，CWD上发生种特异性生长反应，基质养分可用性和菌根真菌有助于观察到的基质间幼苗生长反应的变化。
Smaller‐seeded tree species often require mineral soil and coarse woody debris (CWD) to establish. Limited data suggest that species‐based variation in tree seedling–CWD relations exists; however, the generalizability of this pattern and its mechanistic basis remain unknown. We investigated interspecific substrate–seedling relations and the potential that differences in mycorrhizal status and substrate nutrition underlie these patterns with a potted plant experiment. Eight temperate tree species were grown in a lath shade house on six species of CWD and mineral soil that had either been sterilized with gamma irradiation or left untreated to separate the effects of mycorrhizae from substrate nutrition. We assessed the impact of substrate identity on height growth and investigated possible mechanisms via relating growth to substrate inorganic N concentration, seedling foliar N (%), and mycorrhizal colonization. Seedling height varied across substrates consistently among species (i.e., substrate effects were strong, but seedling species x substrate interactions were weak). Seedlings were generally tallest on mineral soil followed byBetula papyriferaandThuja occidentalisCWD, and shortest onB. alleghaniensisorAcer saccharumCWD. Sterilization main effects on height were not significant; however, the response of species to sterilization varied, asAcer rubrumandT. occidentalisseedlings were significantly shorter on sterilized substrate. For all seedling species, growth correlated positively with substrate [N] and foliar N. Among the four species examined for mycorrhizae, root colonization density was highest on mineral soil and lowest onA.saccharumandB. alleghaniensisCWD). For these species, mean colonization density was more strongly associated with mean seedling height than substrate inorganic [N]. Beneficial mycorrhizal effects were suggested by positive height–mycorrhizal root density relationships forB. alleghaniensis,A. rubrum, andT. occidentalis. Collectively, for the group of northern hardwood tree species examined in this study, these results demonstrate that in a controlled environment, most species grow best on mineral soil,B. alleghaniensis and Picea glaucaattained maximum growth on CWD, species‐specific growth responses occur on CWD, and that substrate nutrient availability and mycorrhizal fungi contribute to the variation observed in seedling growth response across substrates.
日本中部古老亚高山森林中主要针叶树种的基质相关幼苗招募和建立
DOI：
--
发表时间：
2004
期刊：
影响因子：
--
作者：
A. Mori;Eri Mizumachi;T. Osono;Yusuke Doi
通讯作者：
Yusuke Doi