摘要
利用静态暗箱法分析生物结皮对内蒙古典型油蒿沙地灌丛草地土壤呼吸变化特征及水热敏感性影响。结果表明:生物结皮(BSC)与裸地(BG)土壤呼吸速率表现出类似的季节变化动态,BSC土壤呼吸年内变异系数约66.6%～81.7%,高于同期BG的50.9%～76.5%,其年际变异(22.4%)远大于BG(8.0%);BSC生长季土壤呼吸总量约126.88～186.07gC/m2,显著高于BG(91.22～100.90gC/m2)(p<0.05);BSC土壤呼吸对表层土壤水分变化的响应较BG更敏感,两个年份生长季BSC与BG表层0～10cm土壤含水量变化分别能够解释土壤呼吸变异的81.3%,53.2%,57.8%以及55.4%。
A two-year field experiment was carried out in Artemisia ordosica sandy shrubland in the Ordos Plateau of Inner Mongolia,China,in 2006-2007 using a static opaque chamber with an infrared CO2 gas analyzer technique.The effects of biological crust on the main characteristics of soil respiration and its sensitivity to the change of water-heat factors were analyzed.The results indicated that similar seasonal dynamic was found in the BSC and BG.The coefficients of variation （CVs） for soil respiration of BSC in different growing seasons ranged from 66.6% to 81.7%,higher than those of BG,which were in the range of 50.9%-76.5% for the same period,and the inert-annual CV of BSC （22.4%） was also higher than that of BG （8.0%）.The existence of biological crusts enlarged the annual and inter-annual variation in soil respiration.The total soil respiration of different growing seasons for the BSC treatment were 126.88-186.07 g C/m2,significantly higher than those of 91.22-100.90 g C/m2 for the BG treatment.In the growing season,the soil respiration rates were significantly related to surface soil water contents,and the change of soil respiration rate was more sensitive to that of soil water contents in BSC than in BG for the two measured years.81.3%,53.2%,57.8% and 55.4% of variation in soil respiration could be explained by the change in 0-10 cm soil water content for BSC and BG treatments in the two years,respectively.
出处
《地理科学》
CSCD
北大核心
2010年第6期898-903,共6页
Scientia Geographica Sinica
基金
国家自然科学基金项目(40730105
40973057
40501072)
国家科技支撑计划重大项目(2007BAC03A11-02)资助
关键词
生物结皮
土壤呼吸
变化特征
水热敏感性
沙地灌丛草地
biological soil crust
soil respiration
variation characteristics
water-heat dependence
sandy shrubland
