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草业学报 ›› 2021, Vol. 30 ›› Issue (2): 212-219.DOI: 10.11686/cyxb2020116

• 研究简报 • 上一篇    

不同载畜率下短花针茅和土壤生态化学计量特征研究

熊梅1(), 乔荠瑢1, 杨阳1, 张峰1, 郑佳华1, 吴建新2, 赵萌莉1()   

  1. 1.内蒙古农业大学草原与资源环境学院,内蒙古 呼和浩特 010019
    2.内蒙古自治区退耕还林和外援项目管理中心,内蒙古 呼和浩特 010010
  • 收稿日期:2020-03-13 修回日期:2020-04-22 出版日期:2021-02-20 发布日期:2021-01-19
  • 通讯作者: 赵萌莉
  • 作者简介:E-mail: nmgmlzh@126.com
    熊梅(1989-),女,内蒙古乌海人,在读博士。E-mail: 1024720658@qq.com
  • 基金资助:
    内蒙古自治区自然科学基金重大项目(2020ZD03);国家自然科学基金项目(31660108);内蒙古农业大学草地资源教育部重点实验室资助

Stocking rate effects on stoichiometric characteristics of the steppe grassland pioneer species Stipabreviflora and its underlying soil

Mei XIONG1(), Ji-rong QIAO1, Yang YANG1, Feng ZHANG1, Jia-hua ZHENG1, Jian-xin WU2, Meng-li ZHAO1()   

  1. 1.College of Grassland,Resource and Environment,Inner Mongolia Agricultural University,Hohhot 010019,China
    2.Inner Mongolia Management Centre of Returning Farm to Forest and Foreign-aimed Project,Hohhot 010010,China
  • Received:2020-03-13 Revised:2020-04-22 Online:2021-02-20 Published:2021-01-19
  • Contact: Meng-li ZHAO

摘要:

以荒漠草原建群种短花针茅为研究对象,分析不同载畜率(对照,CK;轻度放牧,LG;中度放牧,MG和重度放牧,HG)对短花针茅与其对应土壤(0~20 cm和20~40 cm)碳(C)、氮(N)、磷(P)及化学计量比的影响。结果表明:放牧对短花针茅N、P及C∶N∶P化学计量比没有显著影响,但C含量随载畜率的增加而显著增加(P<0.05);除表层土壤C∶N外,载畜率对两层土壤的N、P及C∶N∶P化学计量比有显著的影响(P<0.05),这些差异主要由土壤N和P的变化决定,但不同土层下载畜率间的化学计量特征没有一致的变化规律;整体上看短花针茅化学计量特征不受土壤化学计量特征变化的影响,放牧具有降低短花针茅P和土壤C的作用,但这种作用随载畜率的增加而降低。相比不放牧处理,重度放牧完全改变了土壤N、P、C∶N和短花针茅C、C∶N特征,而土层深度的加深对MG处理下的土壤P、N∶P和C∶P影响较大。

关键词: 荒漠草原, 载畜率, 短花针茅, 土壤, 化学计量特征

Abstract:

We investigated the effect of stocking rate (Control, CK; Lightly grazed, LG; Moderately grazed, MG and Heavily grazed, HG) on carbon (C), nitrogen (N), phosphorus (P) and their stoichiometry for the pioneer species Stipa brevifloraSb) and its underlying soil for the 0-20 and 20-40 cm depths in desert steppe grassland. Stocking rate had no significant effect on N, P content and no effect on C∶N∶P stoichiometry in Sb foliage, but C content in Sb foliage significantly increased with increase in stocking rate (P<0.05). Soil N, P and C∶N∶P values for the two soil layers were significantly (P<0.05) affected by stocking rate, except for soil C∶N from 0-20 cm. Those differences between C∶N∶P ratios were mainly caused by the changing of soil N and P content, and these effects for the two soil layers were somewhat random with no consistent pattern across stocking rates. The stoichiometry of Sb foliage was not affected by changes in soil stoichiometry. Grazing decreased the Sb P and soil C content, but this effect was decreased by increased stocking rate. Compared with CK, HG markedly changed the characteristics of soil N, P and C∶N and of Sb foliage C and C∶N. The increasing of soil depth showed greater impact on soil P, N∶P and C∶P under MG.

Key words: desert steppe, stocking rate, Stipa breviflora, soil, stoichiometry