(一 )定西县北部山区的白碌乡 ,是典型的黄土高原丘陵沟壑区 ,贫瘠的山坡陡地和干旱少雨的气候条件 ,使得这里满目光山秃岭 ,一片荒凉苍茫。就在这样一个距县城 80多公里的偏远山乡里 ,一位年已六旬的老人——王永瑞 ,二十年如一日 ,坚持不懈地打埂筑坝、整地造林 ,在 50 0多亩 (A) The white hillock in the northern mountainous area of ​​Dingxi County is a typical hilly and gully area in the hilly Loess Plateau. The barren hillside steep and dry arid climate conditions make the area bald and lush, desolate. In such a remote mountain village 80 kilometers away from the county town, a 60-year-old man, Wang Yongrui, has been relentlessly building dams and reforestation land for 20 years,