Species Distribution
How Many numbers of trees?
Species Distribution, means how many numbers of trees are remaining in World. In other words, how many individual trees are alive of a particular species. Our sources for the latest species distribution are IUCN, Forest survey reports of India, and TERI.
Nativity
Where is it from?
Nativity is defined as the tree's 'home' habitat, the agro-climatic suitability, meaning a 'region' or zone in which the tree grows best, without any or little need for maintenance by humans. Additionally it will have more often than not, an eco-system connectivity with other flora and fauna species.
Native plants are plants that have developed, occur naturally, or existed for many years in an area before human intervention. They are ecologically well established to an area in geologic time c.380 Ma to 4000BC (i.e. from the start of plant life on earth till very recently when humans started civilization and started to plant and move trees around). The idea is that it has taken millions of years for the ecology of a region to stabilize to a certain extent (many years as compared to human's existence) It is true that the ecology of our planet keeps changing and few trees which are not native, introduced by humans in an area have been good for the ecology (though most have been bad). but still the 'balance' in the environment of plans, animals, climate has been achieved after millions of years and should be conserved. Or else the environment will change for reasons we may not understand fully and will affect life on the planet. Native trees might be existing in other parts of the world- but should should not completely disappear from its native habitat since other trees, animals and climate depends on it.
Sources: Krishen, P. / Ecological Restoration Alliance (ERA). Roots of Restoration: ERA Primer Series 02., Griha India Native vegetation manual, Indian Plantarum: A compendium of Phytogeographic zones and Plant lists by Dr. Deepa Maheshwari
Native in Gujarat
Gujarat's phytogeographic zones
Gujarat has 10 zones with a set of Climate, Soil, heat, rain etc. conditions that are needed for good growth of a plant species. For e.g. Ahmedabad has a climate which can be termed as Seasonaly dry tropical biome, AKA hot and semi-arid climate type. Tree which grow well, meaning close the maximum size they have been recorded with are said to be climatically suitable, others would need either higher or lower temperature, humidity or different soil conditions or soil type.
