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应用生态学报 ›› 2016, Vol. 27 ›› Issue (10): 3213-3220.doi: 10.13287/j.1001-9332.201610.002

• 目次 • 上一篇    下一篇

生物结皮-土壤呼吸对冬季低温及模拟增温的响应

管超1,2*, 张鹏1, 陈永乐1,2, 宋光1,2, 周媛媛1,2, 李新荣1   

  1. 1中国科学院寒区旱区环境与工程研究所沙坡头沙漠研究试验站, 兰州 730000;
    2中国科学院大学, 北京 100049;
  • 收稿日期:2016-04-22 发布日期:2016-10-18
  • 通讯作者: * E-mail: guanchao880421@163.com
  • 作者简介:管 超,女,1988年生,博士研究生. 主要从事干旱区生态学研究. E-mail: guanchao880421@163.com
  • 基金资助:
    本文由国家自然科学基金项目(Y311491001)和中国科学院“西部之光”项目资助

Response of biocrust-soil system respiration to winter low temperature and simulated warming

GUAN Chao1,2*, ZHANG Peng1, CHEN Yong-le1,2, SONG Guang1,2, ZHOU Yuan-yuan1,2, LI Xin-rong1   

  1. 1Shapotou Desert Research and Experimental Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
    2University of Chinese Academy of Sciences, Beijing 100049, China;
  • Received:2016-04-22 Published:2016-10-18
  • Contact: * E-mail: guanchao880421@163.com
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (Y311491001) and the West Light Program for Talent Cultivation of Chinese Academy of Sciences.

摘要: 以腾格里沙漠东南缘天然植被区藓类结皮和藻-地衣结皮-土壤为研究对象,利用开顶式生长室(OTC),采用Li-8150系统连续测定了冬季(2015年11月—2016年1月)低温环境下两类结皮-土壤呼吸的变化,分析了低温及模拟增温对两类结皮-土壤呼吸的影响.结果表明: 观测期内,藓类结皮、藻-地衣结皮-土壤呼吸速率分别为-0.052~0.418、-0.032~0.493 μmol·m-2·s-1,且藓类结皮显著高于藻-地衣结皮-土壤系统.不同类型结皮-土壤呼吸速率与5 cm土壤温度和土壤体积含水量均呈显著线性正相关,增温主要是通过加速土壤水分蒸散而抑制生物结皮-土壤呼吸速率.在整个观测期,藓类结皮-土壤系统累计排放9.90 g C·m-2,显著高于藻-地衣结皮-土壤系统的7.00 g C·m-2.研究区生物结皮-土壤系统冬季累计排放7.40 g C·m-2,是该荒漠生态系统全年碳收支的重要组成部分.

Abstract: To study the effects of low temperature and simulated warming on respiration of biocrust-soil systems, intact soil columns covered by two dominant types of biocrusts (moss and algae-lichen crusts), were collected in a natural vegetation area in the southeast fringe of the Tengger Desert. Automated soil respiration system (Li-8150) was used to measure respiration rates in biocrust-soil systems under warming (by placing them in an open top chamber) and non-warming treatments in winter (from November 2015 to January 2016). During the whole observation period, soil respiration rates covered by moss crusts were significantly higher than those covered by algae-lichen crusts, which were -0.052 to 0.418 and -0.032 to 0.493 μmol·m-2·s-1, respectively. The respiration rates of the two types of biocrust-soil systems showed significant positive linear correlations with soil temperature and volumetric soil water content at 5 cm depth. Through speeding-up the evaporation rates of soil moisture, imitated warming in winter impeded respiration rates of the two biocrust-soil systems. During the whole observation period, the cumulative carbon (C) release by moss crust-soil system (9.90 g C·m-2) was dramatically higher than that of algae-lichen crust-soil system (7.00 g C·m-2). The cumulative C release by the biocrust-soil systems in this region in winter was 7.40 g C·m-2, thus comprising an important part of annual C budget in the desert ecosystems.