董星丰,陈强,臧淑英,赵光影,刘超,吴祥文.温度和水分对大兴安岭多年冻土区森林土壤有机碳矿化的影响[J].环境科学学报,2019,39(12):4269-4275
温度和水分对大兴安岭多年冻土区森林土壤有机碳矿化的影响
- Effect of temperature and moisture on soil organic carbon mineralization of predominantly permafrost forest in the Great Hing'an Mountains
- 基金项目：国家自然科学基金（No.41571199）；哈尔滨师范大学博士创新基金（No.HSDBSCX2019-02）
- 董星丰
- 哈尔滨师范大学, 寒区地理环境监测与空间信息服务黑龙江省重点实验室, 哈尔滨 150025
- 陈强
- 哈尔滨师范大学, 寒区地理环境监测与空间信息服务黑龙江省重点实验室, 哈尔滨 150025
- 臧淑英
- 哈尔滨师范大学, 寒区地理环境监测与空间信息服务黑龙江省重点实验室, 哈尔滨 150025
- 赵光影
- 哈尔滨师范大学, 寒区地理环境监测与空间信息服务黑龙江省重点实验室, 哈尔滨 150025
- 刘超
- 1. 哈尔滨师范大学, 寒区地理环境监测与空间信息服务黑龙江省重点实验室, 哈尔滨 150025;2. 中国科学院东北地理与农业生态研究所, 湿地生态与环境重点实验室, 长春 130102
- 吴祥文
- 哈尔滨师范大学, 寒区地理环境监测与空间信息服务黑龙江省重点实验室, 哈尔滨 150025
- 摘要：温度和水分是影响土壤有机碳矿化的重要因素，而北方高纬度地区对气候变化响应敏感.本文选取大兴安岭多年冻土区落叶松和樟子松两种森林土壤（0~15 cm）为研究对象，通过测定不同温度（5、10和15℃）及水分（设置土壤含水率分别为30%、45%和60%）处理下的土壤有机碳矿化速率，以明确多年冻土区土壤有机碳矿化对不同梯度环境变化及其交互作用的响应.结果表明：研究区土壤累积碳矿化量为0.39~2.29 mg·g-1，落叶松林土壤高于樟子松林土壤，且矿化率随着培养时间延长呈先降低后稳定的趋势；土壤有机碳矿化程度随温度升高而显著增加（p<0.001），但其对水分的响应因林型而异，落叶松土壤有机碳矿化程度随水分增加而降低，樟子松土壤有机碳矿化程度随水分增加而增加；温度和水分的交互作用对土壤有机碳矿化程度的影响未达到显著水平；土壤有机碳矿化的温度敏感性以土壤含水量为30%的落叶松土壤培养时最低（2.11），以土壤含水量为60%的落叶松土壤培养时最高（2.50），水分和林型对其影响不显著.
- Abstract：Soil temperature and moisture have been identified as two key environmental factors regulating the soil organic carbon mineralization. Northern high latitude region is a susceptible region to climate change. This study investigated the effects of temperature, soil moisture, forest type (Larix gmelini and Pinus sylvestris var. mongolica) and their interactions on soil organic carbon mineralization of the permafrost dominated forest in the Great Hing'an Mountains. The soil organic carbon mineralization rates were measured by laboratory incubations of samples (0~15 cm) from different forest types under varying temperatures (5, 10, and 15℃) and moisture contents (30%, 45%, 60% mass moisture content). The total amounts of carbon mineralization ranged from 0.39 to 2.29 mg·g-1 under the treatments for all sites, and the number of Larix gmelini is higher than that of Pinus sylvestris var. mongolica. The mineralization rate showed a trend of decreasing first and then kept constant. Carbon mineralization significantly increased with temperature (p<0.001), but presented different response to moisture in terms of forest type. The interaction of temperature and moisture had no significant effect on soil organic carbon mineralization. The calculated temperature coefficient (Q10) values ranged from 2.11 (Larix gmelini, 30%) to 2.50 (Pinus sylvestris var. mongolica, 60%). However, the values were not significantly affected by soil moisture and forest types due to the different soil properties.
