img

官方微信

高级检索

中国沙漠 ›› 2014, Vol. 34 ›› Issue (4): 998-1006.DOI: 10.7522/j.issn.1000-694X.2013.00400

• 生物与土壤 • 上一篇    下一篇

降雪对生物土壤结皮光合及呼吸作用的影响

李刚1,2, 刘立超1, 高艳红1, 赵杰才1,2, 杨昊天1,2   

  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, 甘肃 兰州 730000;
    2. 中国科学院大学, 北京 100049
  • 收稿日期:2013-06-12 修回日期:2013-07-09 出版日期:2014-07-20 发布日期:2014-07-20
  • 作者简介:李刚(1986-),男,陕西宝鸡人,硕士研究生,主要从事干旱区生态学研究。Email:ligang5721@163.com
  • 基金资助:
    国家重点基础研究发展计划项目(2009CB421303);中国科学院战略性先导科技专项(XDA05050406);国家自然科学基金项目(40971031)资助

Effects of Snow on Photosynthesis and Respiration of Two Kinds of Biological Soil Crusts in Shapotou, Ningxia, China

Li Gang1,2, Liu Lichao1, Gao Yanhong1, Zhao Jiecai1,2, Yang Haotian1,2   

  1. 1. Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2013-06-12 Revised:2013-07-09 Online:2014-07-20 Published:2014-07-20

摘要: 通过对降雪处理下2种生物土壤结皮(藓类结皮和藻类结皮)光合及呼吸作用的测定,研究了降雪后生物土壤结皮净光合速率和呼吸速率的变化特征。结果表明:冬季生物土壤结皮净光合速率、呼吸速率受空气温度,辐射及土壤水分的影响,水分是关键影响因子;生物土壤结皮的光合及呼吸作用主要有3个阶段性的变化;降雪后生物土壤结皮的净光合速率和呼吸速率都会先增加后降低;生物土壤结皮的净光合速率和呼吸速率变化会受到积雪覆盖、降雪改变温度及水分的影响;生物土壤结皮净光合速率、呼吸速率与降雪量正相关。本研究证实了冬季生物土壤结皮的光合与呼吸作用不可忽略,对全球碳循环过程有重要意义。

关键词: 生物土壤结皮, 降雪, 低温, 光合速率, 呼吸速率

Abstract: Based on continuous measurements of photosynthesis, respiration after different snowfall, We studied the rule of the photosynthesis and respiration of the two kinds of biological soil crusts (soil algal and moss crusts). The result is that a significant positive effect of water, the air temperature and radiation on net photosynthetic rates and respiratory rates were found on the two types of biological soil crusts after snow and the water of the soil is the key effect factor of photosynthesis and respiration of the two kinds of biological soil crusts. There are mainly three stages of the photosynthesis and respiration of the two kinds of biological soil crusts during this experiment. And there was an initial increase and later decrease in net photolytic and respiration rates of each type of crusts after the snow. The net photosynthesis and respiration of the biological soil crusts under different amount of snow would be affected by three aspects which are snow cover and water and temperature change that supplied by the snow. And it suggests that there is a significant positive effect of the amount of snow on net photosynthetic rates and respiratory rates. Our study suggested that the photosynthesis and respiration of the biological soil crusts is not ignorable in winner, and it plays a very important role in the global carbon exchange.

Key words: biological soil crusts, snow, low temperature, photosynthetic rate, respiratory rate

中图分类号: