【摘要】 通过对湟源地区阴坡梯田退耕还林还草工程连续9年样区定点观测,结果表明,在梯田栽植的杨树到第9年100%死亡,榆树的成活率只有8%,沙棘的成活率为87.3%,柠条的成活率达100%,但长势不旺。在样区以撂荒自然恢复形成的草本群落生长旺盛,形成了以赖草为优势种,冰草为亚优势种的群落。恢复的第3-4年草本群落干物质产量达550~650 g/m2,到第8-9年达820~880 g/m2。更多还原

【Abstract】 Effect of returning hill terraced fields for farming to forestry and grass were surveyed based on fixed point observation for nine years continuously.The results showed that death rate of Popular cathayana,Ulmus pumila and Hippophae rhamnoides was 100%,92% and 12.7% respectively in terraced fields.But in abandonment of arable land in study area,herbage community grew well,and the dominant species and sub-dominant species was Leymus secalinus and Agropvron cristatum respectively.Dry matter up to 550～650 g/m2 and 800 g/m2 after resumption for three to four years and eight to nine years respectively.更多还原