摘要
以长株潭亚热带红壤地区为研究区,采用碱液(NaOH)吸收法对植物非生长季节(2011年12月-2012年5月)水田、旱地、马尾松林地和草地4种土地利用类型的土壤呼吸速率进行了测定,并结合水热等因子,对不同土地利用类型土壤呼吸速率的时间差异进行了因果分析.研究结果表明:4种土地利用类型土壤呼吸速率日变化呈单峰曲线,与气温变化趋势一致,水田和旱地土壤呼吸速率在中午最高,马尾松林地和草地土壤呼吸速率在晚上最高;在季节变化中,12月至5月份土壤呼吸速率总体呈上升趋势,但马尾松林地土壤呼吸速率1月份低于12月份、4月份低于3月份,草地则2月份低于1月份、4月份低于3月份;4种土地利用类型的平均土壤呼吸速率由大到小依次为:草地、马尾松林地、水田和旱地;土壤呼吸率主要与气温、土壤温度、湿度、植被生长特性、生物和人类活动等相关.
Soil respiration rates under four land use patterns in the red soil region of Changsha -Zhuzhou - Xiangtan region were measured by the lye （NaOH） absorption method during the non - growing season of December 2011 to May 2012. Differences in soil respiration under the four land use patterns and the relationships between soil respiration and air temperature and soil water contents were analyzed. The results showed that deily changes of soil respiration presented single peak curves, and that of air temperature followed a similar trend. Paddy field and non - irrigated farmland had the highest values at noon, while land of pinus massoniana and grassland had the highest values in the evening. Seasonal changes of soil respiration presented increasing trend from December to May as a whole. But soil respiration rate of land of pinus massoniana in January less than that in December, and so does in April less than in March. As to respiration rate of grassland in February less than that in January and so does in April lower than in March. Estimating the soil respiration gave CO2 effluxes from grassland, land of pinus massoniana, paddy field and non- irrigated farmland, during the non- growth season, of 0.45,0. 277 805,0.228 144,0. 210 406 g · m^-2 · h^-1, respectively. The results also show that air temperature, soil temperature, humidity, vegetation growth characteristics, biological and human activities are closely related to CO2 respiration.
出处
《湖南科技大学学报（自然科学版）》
CAS
北大核心
2013年第4期123-128,共6页
Journal of Hunan University of Science And Technology：Natural Science Edition
基金
湖南省自然科学基金项目(14JJ4042
14JJ2098)
湖南省科技厅软科学项目(2011ZK3037)
湖南省教育厅科研项目(11C0514)
关键词
土地利用
土壤呼吸速率
日变化
季节变化
长株潭地区
land use pattern
soil respiration rate
daily changes
seasonal changes
Changsha -Zhuzhou - Xiangtan region
