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Response of Artificial Grassland Carbon Stock to Management in Mountain Region of southern ningxia, China

Chinese Geographical Science 2014年第4期24卷 436-443页

作者： TANG Long DANG Xiaohu LIU Guobin SHAO Chuanke XUE Sha School of Human Settlements and Civil Engineering Xi'an Jiaotong University College of Geology and Environment Xi'an University of Science and Technology State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water Resources

Grassland is a major carbon sink in the terrestrial ecosystem. The dynamics of grassland carbon stock profoundly influence the global carbon cycle. In the published literatures so far, however, there are limited studies on the long-term dynamics and influential factors of grassland carbon stock, including soil organic carbon. In this study, spatial-temporal substitution method was applied to explore the characteristics of Medicago sativa L. （alfalfa） grassland biomass carbon and soil organic carbon density （SOCD） in a loess hilly region with different growing years and management patterns. The results demonstrated that alfalfa was the mono-dominant community during the cutting period （viz. 0-10 year）. Community succession began after the abandonment of alfalfa grassland and then the important value of alfalfa in the community declined. The artificial alfalfa community abandoned for 30 years was replaced by the S. bungeana community. Accordingly, the biomass carbon density of the clipped alfalfa showed a significant increase over the time during 0-10 year. During 0-30 year, the SOCD from 0-100 cm of the soil layer of all 5 management patterns increased over time with a range between 5.300 ± 0.981 kg/m2 and 12.578 ± 0.863 kg/m2. The sloping croplands had the lowest SOCD at 5.300 ± 0.981 kg/m2 which was quite different from the abandoned grasslands growing for 30 years which exhibited the highest SOCD with 12.578 ± 0.863 kg/m2. The ecosystem carbon density of the grassland clipped for 2 years increased 0.1 kg/m2 compared with the sloping cropland, while that of the grassland clipped for 10 years substantially increased to 10.30 ± 1.26 kg/m2. Moreover, the ecosystem carbon density for abandoned grassland became 12.62± 0.50 kg/m2 at 30 years. The carbon density of the grassland undisturbed for l0 years was similar to that of the sloping cropland and the grassland clipped for 2 years. Different management patterns imposed great different effects on the accumulation of bio

关键词： artificial Medicago sativa L. (alfalfa) grassland clipped grassland abandoned grassland carbon sink carbon density mountain region southern ningxia

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PRODUCTIVITY AND WATER UTILITY FOR MAIN CROPS IN LOESSAL ***, southern ningxia

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Chinese Science Bulletin 1986年第16期31卷 1151-1152页

作者：山崙孙纪斌 Northwestern Institute of Water and Soil Conservation Academia Sinica Yangling Shaanxi Northwestern Institute of Water and Soil Conservation

The loessal hill region in southern ningxia is a semiarid and severe eroded area with developed agriculture and animal husbandry. It has long been an argument whether there might be more potentiality of farming and wh... 详细信息

关键词： southern ningxia PRODUCTIVITY AND WATER UTILITY FOR MAIN CROPS IN LOESSAL HILL.REGION

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Pollen-recorded climate changes between 13.0 and 7.0 14C ka BP in southern ningxia,China

Pollen-recorded climate changes between 13.0 and 7.0 14C ka ...

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中国地理学会2007年学术年会

作者： Sun Ai-zhi~a Ma Yu-zhen~ab Feng Zhao-dong~(ac) Li Fei~a a MOE Key Laboratory of Western China’s Environmental Systems & College of Earth & Environment Sciences,Lanzhou University Lanzhou.73000 China b College of Resources and Technology,Beijing Normal University,Beijing 100875.China c Department of Geology,Baylor University,Waco,USA,TX 76798

The pollen record from Haiyuan section located in the southern part of ningxia Hui Autonomous Region revealed that a detailed history of vegetation and climate changes during the period from ～13.0 to ～7.0 C ka *** w... 详细信息

关键词： Pollen Record Vegetation History Climate Changes southern ningxia

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