摘要
为明晰短期封育措施对高寒草甸植被特征的影响,本研究以短期封育的轻度退化高寒草甸为研究对象,研究围栏内外植被盖度、高度和功能群(禾本科、莎草科和杂类草)生物量的月动态和年动态变化特征,以期为高寒草地管理提供科学依据。结果表明,短期围栏封育处理显著提高了轻度退化高寒草甸植被盖度、高度和地上生物量;不同经济类群植物对围封的响应也有所差异,7月–8月禾草和杂类草植物迅速生长,莎草则在9月后逐渐占据优势。围栏第2年轻度退化草地的群落盖度、地上生物量的提升效果高于封育当年,其中,莎草生物量占地上总生物量的60%以上,禾草占30%左右,杂类草被抑制在10%以下,且封育处理禾草、莎草类和总生物量均高于围栏第1年,7月–10月地上生物量的均值较2011年分别上升了12.4%、161.5%和52.8%,杂类草生物量降低了57.1%。综上,短期围栏封育能够有效恢复贵南县轻度退化高寒草甸。
Grassland degradation has seriously affected the development of animal husbandry on the Qinghai-Tibetan plateau.To clarify the influence of short-term enclosure on the vegetation characteristics of alpine meadows,the short-term enclosure of a lightly degraded alpine meadow was conducted.The vegetation coverage,vegetation height,functional groups(grass,sedge,and forb),and annual dynamic change characteristics of the biomass inside and outside the fence were studied,to provide a scientific basis for the management of alpine meadows.The results showed that short-term enclosure could significantly improve the coverage,height,and aboveground biomass of a lightly degraded alpine meadow.In addition,the response of different plants to grazing exclusion was different.Grasses and forbs grew rapidly from July to August,while sedges gradually increased after September.In 2012,the sedge biomass accounted for over 60%of the total biomass on the ground,the grass biomass accounted for approximately 30%,and the forbs biomass was below 10%.Moreover,the grass,sedge,and total biomass in 2012 were higher than those in 2011.The average aboveground biomass increased by 12.4%,161.5%,and 52.8%in July,August,and September,respectively,and the forbs biomass decreased by 57.1%.In summary,short-term enclosure can be used for the restoration and management of lightly degraded alpine meadows in Guinan County.
作者
贾志锋
马祥
徐成体
刘文辉
魏小星
雷生春
JIA Zhifeng;MA Xiang;XU Chengti;LIU Wenhui;WEI Xiaoxing;LEI Shengchun(Academy of Animal and Veterinary Sciences,Qinghai University,Xining 810016,Qinghai,China;Key Laboratory of Superior Forage Germplasm in the Qinghai-Tibetan Plateau/Qinghai Academy of Animaland Veterinary Sciences,Xining 810016,Qinghai,China)
出处
《草业科学》
CAS
CSCD
2019年第11期2766-2774,共9页
Pratacultural Science
基金
青海省科技厅重点实验室发展专项“青海省青藏高原优良牧草种质资源利用重点实验室”(2017-ZJ-Y12)
青海省饲草产业科技创新平台
关键词
短期封育
轻度退化高寒草甸
植被特征
short-term enclosure
lightly degraded alpine meadow
vegetation characteristics
