Study on the Soil Carbon Pool and Potential Capacity of Carbon Sequestration in the Northern Tibetan Plateau     

Yafeng Zhang  Zhen Yao  Qiang Ma  Bingyan Ji  Guowen Miao  Guang Xu  Fengjuan Ma 《地球科学进展》2018,33(2):206-212

It is important to investigate the soil organic carbon reserves of the northern Tibetan Plateau for understanding the global carbon cycle. The surface soil carbon storage is 1.27×10⁸ t, and the surface topsoil organic carbon density is 4.96×10³ t/km² in the study area. Compared with the results of the second National Soil Census, the distribution of organic carbon reserves of chestnut soil, sierozem, alpine steppe soil, swamp soil, sandy soil and ustic cambisols increased gradually, which are mainly distributed in savanes of the northern Qinghai Lake and woodland in middle-high mountain areas of the eastern Qinghai Lake; savanes and woodland are classified as the carbon sink area because this area’s carbon sequestration is greater than the release quantity. By contrast, the distribution of organic carbon reserves of mountain meadow soil, alpine meadow soil, grey cinnamon soil, chernozem and anthropogenic-alluvial soil decreased gradually, which are mainly distributed in the farming areas of eastern Qinghai Province. This area’s carbon sequestration is less than the release quantity because of cultivation effect, and is classified as the carbon source area. The 97.5% of organic carbon storage cumulative frequency is closed to the threshold value of the organic carbon saturation. The carbon sequestration potential of the study area is 241.57×10⁶ t. Take the widely distributed chestnut soil as a case, it will take 18.66 years to reach saturation for the soil organic carbon reserves of chestnut soil.  相似文献   

Effect of nonlinear advection on the Indian Ocean diploe asymmetry     

WANG Yu  LAN Jian  CUI Fengjuan 《海洋学报(英文版)》2014,33(1):77-82

The asymmetry of sea surface temperature anomaly(SSTA)amplitudes between the positive and negative phases of the Indian Ocean dipole(IOD)are studied.The dynamic effects on it are analyzed using a hybrid coordinate ocean model(HYCOM).It suggests that the IOD is still asymmetric even when forced by a symmetric wind stress,and the asymmetry of the SSTA in the eastern pole is strong while that in the western pole is almost insignificant during the mature phase(September–November(SON)).Thus,the IOD asymmetry is primarily caused by the asymmetry in the IODE.A heat budget analysis is also conducted for the mixedlayer temperature in the eastern Indian Ocean(IODE),which indicates that a nonlinear ocean advection cools both the positive and negative IOD events.Therefore,the nonlinear ocean advection is responsible for the asymmetry of the IOD.  相似文献