Acta Agrestia Sinica

Acta Agrestia Sinica ›› 2019, Vol. 27 ›› Issue (6): 1702-1709.DOI: 10.11733/j.issn.1007-0435.2019.06.029

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Effects of Simulated Sheep Trampling on Biological Soil Rrusts and Plant Root Biomass on the Grassland of the Loess Plateau in China

REN Wei1,2,3, ZHAO Yun-ge1, XU Ming-xiang1, XU An-kai2   

  1. 1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi Province 712100, China;
    2. Jilin Academy of Agricultural Sciences, Changchun, Jilin Province 130124, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2019-05-27 Revised:2019-09-09 Online:2019-12-15 Published:2019-12-31

黄土丘陵区草地根系生物量对踩踏干扰生物结皮的响应

任伟1,2,3, 赵允格1, 许明祥1, 徐安凯2   

  1. 1. 中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西 杨陵 712100;
    2. 吉林省农业科学院, 吉林 长春 130124;
    3. 中国科学院大学, 北京 100049
  • 通讯作者: 赵允格,E-mail:zyunge@ms.iswc.ac.cn
  • 作者简介:任伟(1984-),男,河北井陉人,博士研究生,助理研究员,主要从事生物结皮研究,E-mail:renwei@cjaas.com
  • 基金资助:
    国家自然科学基金面上项目（41571268，41830758）；国家现代农业产业技术体系建设专项资金项目（CARS-34）资助

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Abstract: This study was aimed to study the effects of simulated sheep trampling on biological soil crusts and plant root biomass on the grassland in the loess plateau,which had been prohibited grazing for 20 years,through the field investigation and lab analysis. The results showed that the disturbance decreased the coverage of biological soil crusts,increased the coverage of plants and the total root biomass. The 37% disturbance intensity increased the total root biomass by 104.55%. And the total root biomass in 0~10 cm soil layer was increased by 204.59%. With the increase of disturbance intensity,the soil water content in 0~10 cm soil layer increased gradually. The 48% disturbance intensity increased the soil water content by 22.37%and promoted the accumulation of root biomass. The 37% disturbance intensity decreased the soil temperature by 5.85℃. The disturbance increased the total soil nitrogen content in the subsoil of biological soil crusts,affected the soil nutrient cycle and the redistribution of hydrology and temperature. The disturbance promoted the growth of plant roots,meanwhile induced the shallowness of the root system architecture.

Key words: Cyanobacteria, Moss, Disturbance, Soil physical and chemical properties, Root function traits

摘要： 为明确干扰生物结皮对高等维管束植物的影响，本研究以黄土丘陵区退耕封禁20年左右的草地为对象，通过野外调查与室内分析相结合，研究了踩踏干扰对退耕地生物结皮及植物根系生物量的影响。结果表明：干扰降低了生物结皮盖度，增加了植物盖度；干扰显著增加植物根系总生物量，37%干扰度组较不干扰组增加104.55%，其中0~10 cm土层较不干扰组增加204.59%；干扰增加了0~10 cm土壤含水量，48%干扰度组较不干扰组增加22.37%；干扰生物结皮降低了夏季午后土壤温度，37%干扰度组较不干扰组降低5.85℃；干扰增加了生物结皮下层土壤全氮含量，影响了土壤养分循环以及水文、温度的重新分配，促进了与之镶嵌分布的植物根系的生长，并促使草地根系浅层化。

关键词: 藻结皮, 苔藓, 干扰, 土壤因子, 根系性状

CLC Number: