生态环境学报 ›› 2022, Vol. 31 ›› Issue (8): 1547-1555.DOI: 10.16258/j.cnki.1674-5906.2022.08.006

• 研究论文 • 上一篇    下一篇

返青期休牧措施下高寒草甸主要植物种群的生态位变化特征

周选博1,2(), 王晓丽1,2,*(), 马玉寿1,2, 王彦龙1,2, 罗少辉1,2, 谢乐乐1,2   

  1. 1.青海大学畜牧兽医科学院,青海 西宁 810016
    2.青海大学,青海 西宁 810016
  • 收稿日期:2022-04-14 出版日期:2022-08-18 发布日期:2022-10-10
  • 通讯作者: * 王晓丽(1985年生),女,副教授,博士,主要从事于高寒草地土壤生态学研究。E-mail: wxl.yu@163.com
  • 作者简介:周选博(1994年生),女,博士研究生,主要研究方向为草地生态与环境保护。E-mail: 15500533873@163.com
  • 基金资助:
    国家自然科学基金区域联合基金项目(U21A20183);国家自然科学基金区域联合基金项目(U21A20186);国家自然科学基金项目(31700454);中国科学院-青海省人民政府-三江源国家公园联合研究专项(LHZX-2020-08)

Niche of Main Plant Populations in Alpine Meadow Under the Rest-grazing in the Green-Up Period

ZHOU Xuanbo1,2(), WANG Xiaoli1,2,*(), MA Yushou1,2, WANG Yanlong1,2, LUO Shaohui1,2, XIE Lele1,2   

  1. 1. Academy of Animal Science and Veterinary Medicine of Qinghai University, Xining 810016, P. R. China
    2. Qinghai University, Xining 810016, P. R. China
  • Received:2022-04-14 Online:2022-08-18 Published:2022-10-10

摘要:

探讨高寒草甸物种及群落结构对休牧措施的响应,揭示高寒草甸种群生态位特征,为恢复退化高寒草甸地上植被提供有效措施。在玛沁县大武镇牧草开始返青到家畜转至夏季牧场的50 d内,将休牧时间作为一个综合环境梯度指标,进行了不同休牧时间的野外控制试验。休牧时间分别为休牧20 d(20 d)、休牧30 d(30 d)、休牧40 d(40 d)和休牧50 d(50 d),同时将传统放牧作为对照。控制试验的第3年,在牧草生长旺季时调查植物群落特征。结果表明:在4个不同休牧时间的处理组中,莎草科和禾本科植物的重要值平均较对照分别增加了39.46%和43.71%,而它们的地上生物量平均较对照分别增加了263.60%和225.37%;阔叶型可食草的重要值平均较对照降低了49.83%;草地早熟禾(Poa pratensis)、西藏棱子芹(Pleurospermum hookeri)、高山嵩草(Kobresia pygmaea)和针茅(Stipa capillata)这4种植物的生态位宽度均大于0.990,而青海刺参(Morina kokonorica)生态位宽度较小(0.001);在牧草生长旺季时生态位重叠值大于0.500占总数的90.02%,生态位重叠值小于0.200占总数的1.07%。综上所述,返青期休牧措施影响了高寒草甸不同经济类群的重要值和地上生物量,有利于莎草科和禾本科植物的生长发育。从生态位角度分析,休牧有利于优良牧草的生长,促进退化高寒草甸草地植被恢复。

关键词: 高寒草甸, 返青期休牧, 重要值, 生态位宽度, 生态位重叠

Abstract:

In order to investigate the effects of rest-grazing measures for species and community structure of alpine meadows, reveal the characteristics of population niche, and provide effective measures for restoring aboveground vegetation, a field control experiment with rest-grazing time as the environmental gradient has been conducted from the time when grass returned to green till the livestock moved to the summer pasture in Dawu Town of Maqin County. The rest-grazing time was 20 days (20 d), 30 days (30 d), 40 days (40 d) and 50 days (50 d) of rest-grazing in turn. At the same time, traditional grazing was used as a contrast group. In the third year of the controlled experiment, the characteristics of the plant community after the end of grazing and the peak season of forage growth were investigated. The results showed that in the four treatment groups with different rest-grazing times the important values of Cyperaceae and Gramineae increased by 39.46% and 43.71%, and the biomass of aboveground vegetation of them increased by 263.60% and 225.37%, respectively, compared with the contrast group, And the important values of broad-leaved edible grasses decreased by 49.83% on average compared with the contrast group. The niche widths of Poa pratensis, Pleurospermum hookeri, Kobresia pygmaea and Stipa capillata were greater than 0.990, while the niche width of Morina kokonorica was smaller than 0.001. When grass growth reached its maximum, the niche overlap value was greater than 0.500, accounting for 90.02% of the total, and the niche overlap value was less than 0.200 accounting for 1.07% of the total. In a word, the measures of rest-grazing during the green-up period affected the important values and aboveground biomass of different economic groups in the alpine meadow, which was beneficial for the growth and development of Cyperaceae and Gramineae. From the perspective of ecological niche, rest-grazing is beneficial for the growth of fine pastures and promotes the restoration of degraded alpine meadow.

Key words: alpine meadow, rest-grazing in the green-up period, the important value, niche breadth, niche overlap

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