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首页> 外文期刊>Ecological research >Light and soil moisture effects on biomass and its allocatioi in Osmorhiza depauperata Philippi (Apiaceae)
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Light and soil moisture effects on biomass and its allocatioi in Osmorhiza depauperata Philippi (Apiaceae)

机译：光和土壤水分对Osmorhiza depauperata Philippi（Apiaceae）生物量及其分配的影响

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摘要

Changes in forest openings affect light quality and quantity, and the magnitude of rainfall that reaches the soil surface. Osmorhiza depauperata, a geophyte, acclimates to changes imposed because of forest openings. We studied which changes in biomass allocation allow acclimation of O. depauperata to the various environments that this species inhabits, and where it develops better. Three light intensities (I4 = 4 %, I26 = 26 %, I64 = 64 % of ambient sunlight) and two moisture levels (M40 = 40-60 %, M80 = 80-100 % field capacity) were evaluated on O. depauperata under greenhouse conditions. Plant biomasses per pot were 0.81, 0.56 and 0.48 g at I26, I4 and I64 light intensities, respectively, after one growing season. The biomass allocation to aboveground tissues and leaf area decreased as light intensity increased. Soil moisture modified only belowground biomass and weight of fine roots. The interaction between soil moisture content and light intensity was consistent. This was because of a significant reduction in total plant biomass under high both soil moisture content and high light intensity. Osmorhiza depauperata growth was favored most at medium light intensities. Changes in biomass allocation among various organs allow this species to inhabit forest habitats with different light intensities.
机译：森林开阔度的变化会影响光的质量和数量，并影响到达土壤表面的降雨量。土生植物Osmorhiza depauperata适应因森林开放而引起的变化。我们研究了生物量分配中的哪些变化可以使O. depauperata适应该物种所居住的各种环境，以及该物种在何处生长得更好。在O. depauperata下，在以下条件下评估了三种光照强度（I4 = 4％，I26 = 26％，I64 = 64％的环境日光）和两种水分含量（M40 = 40-60％，M80 = 80-100％田间持水量）。温室条件。一个生长季节后，在I26，I4和I64光照强度下，每盆植物生物量分别为0.81、0.56和0.48 g。随着光强度的增加，生物量分配到地上组织和叶区域的数量减少。土壤水分仅改变地下生物量和细根的重量。土壤水分与光照强度之间的相互作用是一致的。这是因为在高土壤水分含量和高光照强度下植物总生物量显着减少。在中等光照强度下，Osmorhiza depauperata生长最受青睐。各种器官之间生物量分配的变化使该物种能够居住在具有不同光强度的森林栖息地中。

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