Fine root responses to temporal nutrient heterogeneity and competition in seedlings of two tree species with different rooting strategies.
Fine root responses to temporal nutrient heterogeneity and competition in seedlings of two tree species with different rooting strategies.
复制标题
不同生根策略的两种树种幼苗细根对时间养分异质性和竞争的响应
DOI：
10.1002/ece3.3794
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发表时间：
2018-03
影响因子：
2.6
通讯作者：
Weiner J
中科院分区：
文献类型：
--
作者：
Wang P;Shu M;Mou P;Weiner J
摘要土壤异质性和根系可塑性对植物间竞争作用的影响，目前还没有直接的证据。在这项研究中，我们通过实验研究了时间养分异质性对根系生长和两种植物之间的相互作用的影响，具有非常不同的生根策略：枫香（枫香），这表明高根可塑性的土壤养分异质性，和火炬松（火炬松），一种塑料根少。这两个物种的幼苗在种间和种内组合的沙箱中生长。营养素以稳定（缓释）或可变（脉冲）方式应用于贴片中。测定了植物地上生物量、细根质量、营养斑块内外根系分配和根系垂直分布。L.与同一种植物竞争时，大丹枫的地上部分和细根的生长量分别增加了40%和27%，分别增加了41%和8%，但大丹枫的生长量不受L.苏合香斑块营养水平的时间变化对物种竞争相互作用的影响不大。更灵活的L。在火炬松的竞争下，苏合香改变了细根的垂直分布，在种间竞争中，其根更多地分布在深层土壤中，导致了种间的生态位分化，而火炬松的细根分布在所有处理中没有变化。合成. L.结果表明，大甲草通过改变其根系垂直分布和占据未被火炬松占据的空间，表现出更大的根系生长灵活性。这种灵活性使L。在种间竞争中，苏合香具有优势。
Abstract There is little direct evidence for effects of soil heterogeneity and root plasticity on the competitive interactions among plants. In this study, we experimentally examined the impacts of temporal nutrient heterogeneity on root growth and interactions between two plant species with very different rooting strategies: Liquidambar styraciflua (sweet gum), which shows high root plasticity in response to soil nutrient heterogeneity, and Pinus taeda (loblolly pine), a species with less plastic roots. Seedlings of the two species were grown in sandboxes in inter‐ and intraspecific combinations. Nutrients were applied in a patch either in a stable (slow‐release) or in a variable (pulse) manner. Plant aboveground biomass, fine root mass, root allocation between nutrient patch and outside the patch, and root vertical distribution were measured. L. styraciflua grew more aboveground (40% and 27% in stable and variable nutrient treatment, respectively) and fine roots (41% and 8% in stable and variable nutrient treatment, respectively) when competing with P. taeda than when competing with a conspecific individual, but the growth of P. taeda was not changed by competition from L. styraciflua. Temporal variation in patch nutrient level had little effect on the species’ competitive interactions. The more flexible L. styraciflua changed its vertical distribution of fine roots in response to competition from P. taeda, growing more roots in deeper soil layers compared to its roots in conspecific competition, leading to niche differentiation between the species, while the fine root distribution of P. taeda remained unchanged across all treatments. Synthesis. L. styraciflua showed greater flexibility in root growth by changing its root vertical distribution and occupying space of not occupied by P. taeda. This flexibility gave L. styraciflua an advantage in interspecific competition.
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影响因子：
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通讯作者：
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