Soil Organic Carbon Sequestration Potential in Nectarine Orchards under Different Reclamation Systems  

作　　者：Yixiang WANG Boqi WENG Jing YE Chengji WANG Cenwei LIU Yanchun LI 

机构地区：[1]Institute of Agricultural Ecology, Fujian Academy of Agricultural Sciences，Fujian Key Laboratory of Agricultural Ecological Processof Red Soil Mountain, Fuzhou 350003, China

出　　处：《Agricultural Science & Technology》2017年第7期1192-1195,1207,共5页农业科学与技术（英文版）

基　　金：Supported by Science and Technology Program of Fujian Province(2017R1016-4);Natural Science Foundation of Fujian Province(2017J01072)

摘　　要：The Red Soil Hilly Region in South China, where there is a high capacity of carbon(C), and the land use and vegetation cover change greatly, is an important ecological area in the world, and has an important impact on the global carbon cycle and the seasonal fluctuation of atmospheric CO_2. To better evaluate the effects of reclamation systems in orchards converted from grasslands on soil carbon sequestration, we investigated soil organic carbon(SOC) content and stable C isotope(δ^(13)C)composition in three nectarine orchards at Yuchi Experimental Station in South China. Compared with the sloping clean tillage orchard and terraced clean tillage orchard, SOC content in the terraced orchard with grass cover was increased by 14.90% to 38.49%, and 7.40% to 15.33%, respectively. During the 14 years after orchard establishment, the soil organic matter sources influenced both δ^(13)C distribution with depth and carbon replacement. SOC turnover of the upper soil layer in the terraced orchard with grass cover(a mean 63.05% of replacement in the 20 cm after 14 years) was 1.59 and 1.41 times larger than that of the sloping clean tillage orchard and terraced clean tillage orchard under subtropical conditions, respectively. The equilibrium value of soil organic carbon in the three treatments ranged from 16.067 to 25.608 g/kg under the experimental conditions. The equilibrium value of soil organic carbon in the surface layer under grass cover was 54.801 t/hm^2, and the carbon sequestration potential was 24.695 1 t/hm^2.The Red Soil Hilly Region in South China, where there is a high capacity of carbon（C）, and the land use and vegetation cover change greatly, is an important ecological area in the world, and has an important impact on the global carbon cycle and the seasonal fluctuation of atmospheric CO2. To better evaluate the effects of reclamation systems in orchards converted from grasslands on soil carbon sequestration, we investigated soil organic carbon（SOC） content and stable C isotope（δ13C）composition in three nectarine orchards at Yuchi Experimental Station in South China. Compared with the sloping clean tillage orchard and terraced clean tillage orchard, SOC content in the terraced orchard with grass cover was increased by 14.90% to 38.49%, and 7.40% to 15.33%, respectively. During the 14 years after orchard establishment, the soil organic matter sources influenced both δ13C distribution with depth and carbon replacement. SOC turnover of the upper soil layer in the terraced orchard with grass cover（a mean 63.05% of replacement in the 20 cm after 14 years） was 1.59 and 1.41 times larger than that of the sloping clean tillage orchard and terraced clean tillage orchard under subtropical conditions, respectively. The equilibrium value of soil organic carbon in the three treatments ranged from 16.067 to 25.608 g/kg under the experimental conditions. The equilibrium value of soil organic carbon in the surface layer under grass cover was 54.801 t/hm2, and the carbon sequestration potential was 24.695 1 t/hm2.

关 键 词：ORCHARD Soil organic carbon Carbon sequestration potential δ13C 

分 类 号：S153.6[农业科学—土壤学] S662.1[农业科学—农业基础科学]