呼伦贝尔沙地樟子松人工林乔木层固碳速率及其对气象因子的响应  

Carbon sequestration rate of Pinus sylvestris var.mongolica plantation and its responses to climate factors in Hulunbuir Sandy Land

作　　者：曹恭祥[1] 郭中[1] 王云霓[1] 季蒙[1] 韩珊珊 耿庆春 冯丽红 刘海利 CAO Gong-xiang;GUO Zhong;WANG Yun-ni;JI Meng;HAN Shan-shan;GENG Qing-chun;FENG Li-hong;LIU Hai-li(Inner Mongolia Academy of Forestry Science,Hohhot 010010,China;The Forestry Bureau of Honghuaerji,Hailaer 021112,Inner Mongolia,China)

机构地区：[1]内蒙古自治区林业科学研究院,呼和浩特010010 [2]红花尔基林业局,内蒙古海拉尔021112

出　　处：《生态学杂志》2020年第4期1082-1090,共9页Chinese Journal of Ecology

基　　金：林业公益性行业科研专项课题(201404204-01A);全球环境基金内蒙古项目(GEF-NMG-201601)资助。

摘　　要：以呼伦贝尔沙地樟子松人工林为对象,利用树木年轮学方法和解析木法,推算过去41年的樟子松林生物量、碳密度和固碳速率,并分析固碳速率与月均气温、月均最低温、月均最高温、月降水量、月均大气相对湿度等气象因子的关系。结果表明:樟子松林碳密度随着林龄的增加而增加,碳密度从1977年的2.58 t·hm^-2增加到2017年的87.97 t·hm^-2;樟子松林固碳速率的年际差异较大,总体上呈现出先增加后减小,最终趋于稳定的趋势,多年固碳速率为1.37~3.21 t·hm^-2·a^-1,平均为2.13 t·hm^-2·a^-1;樟子松林固碳速率与上一年和当年生长季的降水呈正相关,与非生长季降水呈负相关,特别是与上一年12月和当年3月降水量呈显著相关;与上一年和当年8—9月的月均湿度显著正相关;与上一年及当年生长季的月平均气温、月均最低温和月均最高温呈显著或极显著负相关;樟子松林固碳能力同时受温度和降水的影响,但温度的影响大于降水的影响,在未来该地区气候暖干化的变化趋势下樟子松林固碳潜力可能会降低。Pinus sylvestris var.mongolica is one of the main native plantation species in Hulunbuir Sandy Land.Understanding the response of biomass carbon density of Pinus sylvestris var.mongolica plantation to changes of climatic factors is important for rational management to enhance carbon sequestration.We set three 30 m×30 m plots in plantation with stand age of 41 years in Hulunbuir Sandy Land.Using dendrochronological methods and empirical biomass equations,we estimated biomass,carbon density,and net vegetation carbon sequestration rate(CSR)of Pinus sylvestris var.mongolica plantation in the past 41 years.Further,we analyzed the relationship between CSR and climatic factors,including monthly air temperature,humidity and precipitation.The results showed that carbon density increased with increasing stand age,with2.58 t·hm^-2 in 1977 to 87.97 t·hm^-2 in 2017.The interannual variation of CSR showed a trend of increasing first and then decreasing.The average CSR was 2.13 t·hm^-2·a^-1,within a range of 1.37-3.21 t·hm^-2·a^-1.The CSR of Pinus sylvestris var.mongolica plantation was positively correlated with precipitation in the growing season of previous year and current year,and negatively correlated with precipitation in the non-growing season.The CSR was negatively correlated with precipitation in last December and that in current March.The CSR was positively correlated with the average daily air relative humidity from August to September in previous year and current year.The CSR was negatively correlated with monthly average temperature,monthly average minimum temperature,and monthly average maximum temperature.In general,the CSR is affected by temperature and precipitation,with higher sensitivity to temperature.Our results highlight that CSR of Pinus sylvestris var.mongolica plantation could decrease in the future due to potential warming in Hulunbuir.

关 键 词：樟子松 碳密度 固碳速率 气象因子 

分 类 号：S718.5[农业科学—林学]