Importance of microhabitat and acorn burial on Quercus ilex early recruitment:: non-additive effects on multiple demographic processes
Importance of microhabitat and acorn burial on Quercus ilex early recruitment:: non-additive effects on multiple demographic processes
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DOI：
10.1023/b:vege.0000026327.60991.f9
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发表时间：
2004-06-01
期刊：
影响因子：
1.7
通讯作者：
Gòmez, JM
中科院分区：
文献类型：
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作者：
Gòmez, JM
这项研究研究了微生境和种子埋葬对早期Quercus ilex期间主要人口统计过程的影响，例如分散后种子捕食，种子发芽和幼苗出现，生存和生长。在本研究中分析的所有过程中，埋葬的影响均为正，因为捕食率较低（63.6％比88％），而发芽率（53.1％对21.8％）和出现（32.0％vs. 5.5％）为埋葬的橡子更高。在研究的整个阶段和过程中，某些微居民的质量仍然相似。因此，由于种子捕食较低，造林提供了特别合适的微生境，而发芽，出现和幼苗存活率比其他任何微生境都高。相比之下，招聘阶段之间的某些微栖息地的质量（例如开放地点和Holm Oaks）有所不同。开放地点的橡子逃脱了捕食并容易发芽，但大多数幼苗由于夏季干旱而死亡。同样，尽管霍尔姆橡树下的橡子可以发芽并生存干旱，但它们无法生存到后分散的捕食者。这种解偶联导致Q. ilex新兵的空间分布发生后分散变化。此外，对于某些人口统计学过程，埋葬和微栖息地之间存在显着相互作用。该招募是在高森林中，无论葬礼如何，都表明埋葬在高质量的栖息地中并不像在低品质的栖息地中那样有益。对植物募集的准确了解不仅需要确定限制因素的直接影响，而且还需要确定它们之间发生的潜在相互作用。
This study investigates the effect of microhabitat and seed burial on the main demographic processes operating during the early recruitment of Quercus ilex, such as postdispersal seed predation, seed germination, and seedling emergence, survival and growth. The effect of burial was positive over all the processes analysed in this study, since predation rate was lower (63.6% vs. 88%), whereas germination (53.1% vs. 21.8%) and emergence (32.0% vs. 5.5%) were higher for buried acorns. The quality of some microhabitats remained similar throughout the stages and processes studied. Thus, afforestation provided especially suitable microhabitats for oak establishment, since seed predation was lower, while germination, emergence and seedling survival were higher, than in any other microhabitat. By contrast, the quality of some microhabitats, such as open sites and Holm oaks, differed between recruitment stages. Acorns in open sites escaped predation and germinated easily, but most seedlings died due to summer drought. Similarly, although acorns under Holm oaks can germinate and survive drought, they cannot survive to postdispersal predators. This uncoupling results in a post-dispersal change in the spatial distribution of Q. ilex recruits. Furthermore, there were significant interactions between burial and microhabitat for some demographic processes. The recruitment was in afforestations high irrespective of burial, suggesting that burial is not as beneficial in high-quality habitats as it is in lower-quality ones. An accurate understanding of plant recruitment requires the determination not only of the direct effects of limiting factors but also the potential interactions occurring between them.