|
|||||
|
|
Changes in soil organic carbon and total nitrogen stocks after conversion of meadow to cropland in Northeast China |
|
| Authors: | Fan Ding Ya-Lin Hu Lu-Jun Li Ang Li Shengwei Shi Pei-Yong Lian De-Hui Zeng |
| Affiliation: | 1. State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110164, China 2. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China 3. University of Chinese Academy of Sciences, Beijing, 100049, China 4. Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, 150081, China 5. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100083, China 6. Daxing’anling Academy of Forestry Science of Inner Mongolia, Yakeshi, 022150, China 7. Institute of Applied Ecology, Chinese Academy of Sciences, 72 Wenhua Rd, Shenyang, 110016, China |
| Abstract: | AimsGrassland conversion to cropland (GCC) may result in loss of a large amount of soil organic carbon (SOC). However, the assessment of such loss of SOC still involves large uncertainty due to shallow sampling depth, soil bulk density estimation and spatial heterogeneity. Our objectives were to quantify changes in SOC, soil total nitrogen (STN) and C:N ratio in 0–100 cm soil profile after GCC and to clarify factors influencing the SOC change.MethodsA nest-paired sampling design was used in six sites along a temperature gradient in Northeast China.ResultsSOC change after GCC ranged from ?17 to 0 Mg ha?1 in 0–30 cm soil layer, recommended by IPCC, across the six sites, but ranged from ?30 to 7 Mg ha?1 when considering 0–100 cm. We found a linear relationship between SOC change in 30–100 cm and that in 0–30 cm profile (ΔC30?100?=?0.35ΔC0?30, P?Conclusions The magnitude of SOC loss following GCC in Northeast China is lower than the global average value, partly due to low MAT here. However, the current low SOC loss can be intensified by remarkable climate warming in this region. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |