many of our pioneer plants thrive to a point that they seem small trees. as seen in the photo, many are way taller than me.
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Before we can start to discuss succession, we need to establish what are Pioneer Plants and the role they play in it.
Pioneer plants are those that are capable of growing in a given area before any other plant. they can only thrive in full sun and are very hardy in general, being able to establish themselves in harsh conditions like lack of shade, exposure to winds, lack of humidity and very pure soil.
these plants later create favorable conditions for other, more delicate plants to follow. they can be the first ones to establish after fire or any other type of soil degradation.
pioneer plants are an important asset to have for those who want to transform their land into a forest / food forest as they can be used as a base for those.
about half of the farm is in a shrub state, most of which is being used to establish both native and fruit trees
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now that we have established what pioneer plants are, let us examine what an Ecological Succession actually mean.
It is a natural process of the evolution of a terrain from being poor and exposed into one covered with shrub and eventually into a forest.
this is a natural process and can take many years.
many factors effect the speed in which succession would take place, like the local climate, soil type, solar exposure, local vegetation and so on.
succession takes different forms in different climates and in this post I will discuss succession as we observe it here in Central Portugal.
our shrub is made up almost entirely of 3 plants:
White Broom (Cytisus multiflorus)
Yellow Broom (Cytisus striatus)
and
Adenocarpus complicatus
all three are very wide spread pioneer plants in our region. they are all of the same family (Fabaceae) and they all fix Nitrogen into the soil around their roots that other plants can then take advantage of for their own growth.
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our local climate is called continental mediterranean. it is characterized by long dry summers with high temperatures and a short, cold wet season.
annual rain fall averages between 600-800mm, often much less. drier years show direct correlation with devastating wildfires. temperatures can range between -7C to 47C
solar radiation peaks at 11 UV typically between mid May and the end of August (11 UV is considered extreme and it is due to the lack of pollution in the air in our area)
a young Carob tree being established under the shrub where it is protected from our severe frosts
a common practice we see around us is when people raze the shrub to the ground, leaving the soil bare and exposed, this is done to achieve a "clean slate" to be able to work with.
now, try to imagine a soft seedling planted on such bare land. it is exposed to wind that also dries the soil further, it is exposed to direct sun and its radiation all day long, the soil around it is literally dead as no bacteria can survive in it and there are no other roots systems present to hold the soil together in extreme rain events.
it becomes close to impossible to establish a plant in such conditions without having to have it on artificial "life support". success rates from planting events can be as low as 5 or 10% depending on the year, but overall, very low.
on the other hand, one can work with nature for much better results and actually accelerate succession in doing so.
the many benefits of working (planting and sawing) with an establish shrub include:
· wind breaking
· shade
· humidity
· protection from wildlife (boars, rodents etc.)
· organic material
· Nitrogen
· Mycelium
· frost
Holm Oak (Quercus Ilex) grew from a sawn acorn that was placed in a way that did not allow boars to dig it out.
and top view of another that was sawn smack in the middle, totally out of their reach.
our oldest one is now taller than the surrounding pioneer plants. as soon as it creates too much shade they will no longer be able to thrive and eventually die off.
an Apple tree and a Pecan. making their way up faster due to the competition they have with the larger plants around them. the Pecans suffer from leaf burns due to our intensive solar radiation in their first year of life and hence have to have some protection.
Pedunculate Oak (Quercus robur), a native, now well established in the shade of the shrub. many of the smaller plants are sawn or planted to the East of the bigger plants, hence allowing them to be shaded in the hottest afternoon hours in Summer.
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