北温带干旱地区土壤剖面二氧化碳通量的变化特征 |
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北温带干旱地区土壤剖面二氧化碳通量的变化特征 Characteristics of the carbon dioxide flux in profiles of arid soils in north temperate region, China. 发布时间：2009-12-17 浏览量：285 收藏数：0 评论数：0 总览 评价 高程达1， 孙向阳2*， 张林2， 李志刚3， 阿拉塔4 （ 1、北京林业大学，中国林业科学研究院资源信息所； 2、北京林业大学水土保持学院； 3、宁夏贺兰山国家级自然保护区管理局； 4、内蒙古农牧业科学院； ）
摘要： 采用开放式样杆方法，对干旱土纲的4种土壤类型进行了土壤剖面CO2 通量的观测研究，主要结果为：①干旱地区土壤剖面CO2通量的变化趋势是：在0-60 cm深度范围内随土壤深度增加而增加，60 cm为转折点，之后，随土壤深度增加而减小。 ②土壤剖面CO2碳通量平均值为660 µmol/(m2•h)，在-9076-16 988 µmol/(m2•h)范围内变化，如果土地利用/土地覆盖发生改变（0-70 cm深度），将可能有254.6 t CO2/(km2•a)从土壤向大气释放。③土壤种类不同，CO2通量明显不同，森林土壤释放量大于草原土壤。④在通量-深度曲线中，各土壤类型均出现1-2个拐点，变化原因与土壤剖面结构和根系分布有关，钙积层的有无、厚度起决定作用。⑤存在季节变化，植物生长季节的CO2通量远大于其他季节，其他季节可能有土壤吸收二氧化碳现象。由此应避免在植物生长季节施工动土，以减少土壤CO2向大气中释放。⑥本研究建议：善待土壤，谨慎动土。
关键词： 土地利用和覆盖变化；二氧化碳气体释放和吸收；气候变暖；栗钙土；灰钙土；山地灰褐土；粗骨土 GAO Cheng-da1， Sun Xiangyang1*， Zhang Lin1， Li Zhigang2， Alata3 （ 1、College of Water and Soil Conservation, Beijing Forestry University； 2、Authority of Helan Mountain of National Nature Conservation in Ningxia； 3、Agriculture and Animal Husbandry in Inner Mongolia Academy of Sciences； ）
Abstract： By an in situ approach of open-sample pole, we studied the carbon dioxide flux in profiles of 4 types of arid soil, i.e., chestnut soil, sierozem soil, fragmental soil and gray-cinnamonic soil. The results were that 1) CO2 flux increased with soil depth at 0-60 cm, and decreased with soil depth at the deeper after a turning depth at 60cm; and 2) mean soil CO2 flux at 0-70 cm depth was 660 μmol/(m2.h), ranging from -9076 to 16988 μmol/(m2.h). It would be estimated that 254.6 T CO2/(km2.a) gas may be released from soil into the atmosphere if the soil at 0-70 cm depth was exposed to the air for some reason of land use/land cover change; and 3)the CO2 flux in profile of arid soil differed greatly in the soil types, and the CO2 flux in profile of arid soil from forest soil (gray-cinnamonic soil and fragmental soil) was larger than that from the grassland soil (sierozem soil and chestnut soil); and 4)in the flux-depth curve, there were 1-2 turning points occurred for soil structure, roots distribution, and calcium accumulation layer; and 5)CO2 flux in profile of arid soil changed as seasonal change, and was greater in plant growing season than in others season, and there would be a phenomenon of soil absorbing CO2 in others season, and thus recommended to avoid the ground-breaking in the season of plant growing in order to reduce more soil CO2 released into atmosphere; 6) the results suggested that friendly treat the soil, ground-breaking carefully.
Keywords： land use/cover change;CO2 gas release and absorption;climate warming;chestnut soil;sierozem soil;gray-cinnamonic soil;fragmental soil
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