The difference between grass and tree

Grass and trees are two big kinds of plants, and they are also green plants that we can often see. So, do you know the difference between grass and trees?

What is the difference between grass and tree?

Grass is a herbaceous plant, the general degree of Lignification of the stem is low, and mostly annual and biennial plants; trees are generally taller than herbaceous plants, the degree of Lignification of the stem is high, xylem accounts for the vast majority of the stem, which is perennial.

What are the main species of herbaceous plants?

1. Annual herbs

Annual herb (annual) refers to the herbaceous plants whose life span is only 1 year from seed germination, growth, flowering, fruiting to withering and death, that is, the plants that bloom and die after fruiting in a growing season, such as morning glory, melon and leaf chrysanthemum, gourd, chrysanthemum and so on.

two。 Biennial herbs

Biennial herbs (biennial), which only grow vegetative organs in the first growing season (autumn), bloom in the second growing season (spring), and wither after fruiting, such as winter wheat, sugar beet, broad bean and so on.

3. Perennial herbs

Perennial herbs (perennialherb), which have a long life, are generally herbaceous plants of more than two years, such as chrysanthemum, orchid, lotus, water lily, gentleman orchid and so on. The roots of perennial herbs are generally stout, and some have organs such as tubers, tubers, bulbs and bulbs. In winter, parts of the ground still sleep quietly, and when the climate gets warmer the next year, they sprout and grow again. As it grows year after year, the underground roots or stems may gradually become hypertrophic or branched. This provides us with a basis for identifying their age; its age can be inferred from the number of branches in its underground part, the size, length and thickness of its stem or root.

Perennial herbs can live for more than two years. The underground parts of some plants are perennial, such as persistent roots or rhizomes, bulbs, tubers and other abnormal organs, while the aboveground parts die every year, and new branches grow from the underground parts in the following spring, such as lotus root, onion, taro, sweet potato, dahlia and so on. In addition, the aboveground and underground parts of some plants are perennial, after flowering and fruiting, the aboveground parts still do not die, and can bear fruit many times, such as evergreen, Ophiopogon japonicus and so on.

3. What are the main types of trees?

1. Classified by tree growth type:

(1) trees, tall (usually 6 m to tens of m), with a distinct tall trunk.

(2) shrubs, with a short body (usually less than 6 m) and a low base of the trunk.

(3) Liana, a woody plant (such as Parthenocissus parthenocissus) that can grow upward by winding or clinging to something else.

(4) the creeping class, stem, branch, etc., all grow creeping (e. G. cypress).

two。 Classified according to the adaptability to environmental factors:

(1) according to the heat factor, tropical tree species, subtropical tree species, temperate tree species and cold subcold zone tree species.

(2) according to the water factor, it can be divided into drought-tolerant tree species (fractional grade) and moisture-tolerant tree species (fractionable grade).

(3) according to the light factor, positive tree, neutral tree and negative tree can be graded in each category.

(4) according to the air factor, there are four types of trees: wind-resistant tree species, smoke-resistant and toxic gas-resistant tree species, dust-resistant tree species and health care tree species (aromatic molecules that can secrete volatile fungicides and beneficial to human beings).

(5) according to soil factors, acidophilic tree species, alkaline tolerant tree species, barren tolerant and coastal tree species.

3. Classified by ornamental characteristics of trees:

(1) ornamental trees (trees)

(2) foliage trees (leafy trees)

(3) flowering trees (flowers and trees)

(4) Fruit trees (fruit trees)

(5) Root trees (root trees)

4. Classified by the use of trees:

(1) individual ornamental trees (solitary planting trees, specimen trees, ornamental trees)

(2) shade trees; street trees; protective trees; forest classes

(3) flowers and trees; vines; hedgerows and green sculptures

(4) ground cover plants; house foundation planting; pile scenery; indoor greening decoration.