At present, there are a number of native species of timber trees, down from renewable plantations, timber species well. Timber varieties, seed quantity less original and relatively little seed is.
The original tree species have declined by replanting with varieties of rubber. The amount of rubber seeds, traditional varieties are less and less seed.
At present, the rubber traditional varieties reduced from to replant rubber with good breeding Therefore, the quantity of rubber seed traditional varieties decreased and caught seed is relatively low.