欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志 ›› 2010, Vol. 29 ›› Issue (07): 1333-1339.

• 研究报告 • 上一篇    下一篇

冻融交替对科尔沁沙地不同土地利用方式土壤呼吸的影响

王 琼1,2,范志平2**,王满贵3,张新厚2,孙学凯2,曾德慧2   

  1. 1辽宁大学环境学院,沈阳 110036;2中国科学院沈阳应用生态研究所大青沟沙地生态实验站,沈阳 110016;3内蒙古通辽市森林资源经营管理站,内蒙古通辽 028000
  • 出版日期:2010-07-08 发布日期:2010-07-08

Effects of freezing-thawing cycle on soil respiration under different land-use patterns in Keerqin Sandy Lands.

WANG Qiong1,2, FAN Zhi-ping2, WANG Man-gui3, ZHANG Xin-hou2, SUN Xue-kai2, ZENG De-hui2   

  1. 1School of Environmental Science, Liaoning University, Shenyang 110036, China;2Daqinggou Ecological Station, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;3Tongliao Forest Resources Management Station, Tongliao 028000, Inner Mongolia, China
  • Online:2010-07-08 Published:2010-07-08

摘要: 在中高纬度和高海拔地区,冻融作用影响土壤的理化性质和微生物性状,进而影响土壤呼吸过程。研究冻融作用下土壤呼吸的变化,对准确估算全球碳循环具有重要意义。以科尔沁沙地沙质草地、樟子松疏林草地和农田为研究对象,通过冻融实验比较不同土地利用方式和冻融循环对土壤呼吸的影响。结果表明:土地利用方式对土壤呼吸有显著影响,在未发生冻融作用时沙质草地土壤呼吸速率显著大于樟子松疏林草地和农田(P<0.05),3种土地利用方式的土壤呼吸平均速率分别为0.339、0.258和0.234 μmol CO2·m-2·s-1;不同冻融循环对沙质草地和樟子松疏林草地土壤呼吸影响显著(P<0.05)。其中,一次冻融循环条件下沙质草地、樟子松疏林草地和农田土壤呼吸平均速率分别为0.276、0.243和0.233 μmol CO2·m-2·s-1,多次冻融循环条件下分别为0.314、0.274和0.259 μmol CO2·m-2·s-1;沙质草地、樟子松疏林草地和农田的Q10值分别为116.0、26.2和16.4,表明冬季低温条件下土地利用方式强烈影响土壤呼吸对温度的敏感性。

关键词: 景观结构, 景观异质性, 绿地系统, 沈阳

Abstract: Soil freezing-thawing cycle is common in mid-high latitude and high altitude regions, which may affect soil physicochemical and/or biological properties, and further, soil respiration process. To study the variations of soil respiration rate under  freezing-thawing cycle is of significance in accurately estimating global carbon budget. Taking the sandy grassland (SG), Mongolian pine savanna (MPS), and farmland (FD) in Keerqin Sandy Lands as test objects, a laboratory experiment was conducted to study their soil respiration rates under  freezing-thawing. Land use pattern had significant effects on the soil respiration rate. In the control (no freezing-thawing), the respiration rate was higher in SG than in MPS and FD (P<0.05), with the value being 0.339, 0.258, and 0.234 μmol CO2·m-2·s1 , respectively; while under freezingthawing, the soil respiration rate was significantly higher in SG and MPS than that in FD (P<0.05). The mean soil respiration rate in SG, MPS, and FD under one freezing-thawing cycle was 0.276, 0.243, and 0.233 μmol CO2·m-2·s-1, and that under multi freezing-thawing cycles was 0.314, 0.274, and 0.259 μmol CO2·m-2·s-1respectively. The Q10value in SG, MPS, and FD was 116.0, 26.2, and 16.4, respectively, suggesting the strong effects of land use pattern on the temperature dependence of soil respiration at low temperature in winter.

Key words: Landscape structure, Landscape heterogeneity, Vegetation, Shenyang