Poplar is the most common tree in the northwest of China. As long as there is grass, there is the shadow of poplar. Poplar is not very particular about living conditions. Roadside, beside the ridge, where there is loess, there is her survival. She doesn't chase rain, and she doesn't long for sunshine. As long as she can water the hardened land a little, a poplar will take root and sprout. As long as a little space is set aside for weeds to survive, she will decorate the yellow land and hold up a piece of green. She doesn't need to fertilize and water like a delicate lawn. As long as she doesn't use a knife and axe to chop, and gives her a relaxed environment to absorb free air, she will hold her head high. She never rejected the land where she grew up. She is not a vine, rooted in poor soil, happy-go-lucky, otherwise, because she belongs to the grassroots. Although poplar was born in poverty, it is the most concerned about the quality of life. There is still ice in the soil, and the spring breeze is still chilly. Green shoots have sprouted from her branches. Under the heavy pressure, every bud and leaf of her is striving for progress, never bending down to beg, and there is no flattering face. In the autumn wind, although the leaves have been stripped, the thin branches are still full of essence, and the branches stand upright and hold their heads high. In the severe winter, facing the sword, she still stands on the cold yellow land, with proud branches, silent trees and voices. At this time, the noble flowers and plants, however, are in the greenhouse, receiving the nutrients sent to the leaves and roots, lazily killing the bloodless days. Poplar's temperament is civilian, but it is the richest. She can be used as firewood, furniture, purlin and farm tools. Like the yellow land where she grew up, it is unpretentious. In some people's eyes, she will almost forget her existence. But for the barren yellow land, she is a brave person. Throughout the year, she stayed and decorated, which reduced the poverty and loneliness of the yellow land and increased the vividness and beauty, because her roots have been integrated with the yellow land. Poplar did not expect to transplant and migrate, even if her fallen branches and leaves were corroded by soil, it would add some nutrients and vitality to this yellow land. Under the thick loess, the immortal life of poplar is surging, and the yellow land is crisp and green. The sower sowed another poplar, and in a few years, the poplar will become a bigger green again. If the tree is 20 meters high, the roots will grow more than 40 meters. Poplar is a typical representative of poplar in Salicaceae. Morphological characteristics of Salicaceae; Trees or shrubs. Simple leaves and stipules alternate. Flowers unisexual, in a panicle. Every flower has bracts, but no perianth, disk or gland. 2 stamens, pistil 1, ovary 1. Capsule, 2-4-valved, small seeds, many, with long hair at the base. Salicaceae features: woody, single leaf with stipules, catkin, no perianth, disk or gland. Capsule with small seeds and long hair at the base.