高寒农区不同恢复年限弃耕地的植物群落演替  

PLANTS COMMUNITY SUCCESSION OF ALPINE OLD- FIELDS RETURNED TO GRASSLAND WITH DIFFERENT RETURNED PERIODS

作　　者：欧为友[1] 谢久祥[2] 

机构地区：[1]青海省草原总站,青海西宁810008 [2]青海大学农牧学院,青海西宁810016

出　　处：《青海草业》2016年第2期2-6,10,共6页Qinghai Prataculture

摘　　要：研究弃耕地植物群落的演替规律对于指导退耕还林还草工作有重大意义,但目前关于高寒农区退耕还草地植物群落演替规律的报道还很少,为此,我们研究了青海省大通县高寒农区弃耕地植物群落的演替过程。结果发现:在退耕年限为3a、5a、10a、30a的四组弃耕地和两组原生植被之间,物种数和生物量都有极显著变化。在退耕初期,植被稀疏,生物量极低;随着退耕年限的增加,物种数发生了很大变化。从退耕开始到撂荒后的30a,群落组分由一年生逐渐向多年生发展,到第30a时开始出现高寒草甸特有植物,但物种数和植被生物量与原生植物群落相比,还有明显差距,说明高寒农区弃耕地植被恢复时间很长。基于本研究的结果,我们对高寒农区弃耕地植被合理迅速恢复的人为干预策略作了适当探讨。The exploration on the discipline of plant community succession can shed much light on the issue of old-fields restoration, but the relative research on alpine old-fields have seldom been reported. We studied the succession process of the alpine old-fields plant community in Datong County, and the succession process was investigated through of a temporal series from 3a, 5a, 10a, 30a and other 2 native alpine meadows. Results showed that species richness and community productivity of plant community changed significantly through the succession process. Three years after abandoned, the vegetation was very sparse and the productivity was very low, the vegetation was mainly composed by annual forbs; As the years went by, the species richness and pro- ductivity increased in a linear growth pattern. The species richness of 30a old-fields was similar to that of the 2 native alpine meadows, but the community productivity of 30a old-fields was much lower than that of the 2 n- ative alpine meadows. We concluded that the alpine meadow was difficult to restore once been destroyed, after 30 years＇ restoration, alpine meadow was far from restored. Based on the discipline of plant community succes- sion, some methods for the rapid restoration of alpine old-fields were recommended.

关 键 词：生态恢复 物种数 生物量 地下生物量 高寒草甸 

分 类 号：S812.8[农业科学—草业科学]