Ren S J, Cao M K, Tao B, et al. The effects of nitrogen limitation on terrestrial ecosystem carbon cycle: a review. Progress in Geography, 2006, 25(4): 58-67.
[2]
Wang S Q, Yu G R. Ecological stoichiometry characteristics of ecosystem carbon, nitrogen and phosphorus elements. Acta Ecologica Sinica, 2008, 28(8): 3937-3947.
[3]
Chen X P, Shang Z H. Progress of carbon cycle research in China grassland ecosystem. Chinese Journal of Grassland, 2011, 33(4): 99-110.
[4]
Qin Y, Yi S H, Li N J, et al. Advance in studies of carbon cycling on alpine grasslands of the Qinghai-Tibetan Plateau. Acta Prataculturae Sinica, 2012, 21(6): 275-285.
[5]
Rustad L E, Campell J L, Marion G M, et al. A meta analysis of the response of soil respiration, net nitrogen mineralization, and aboveground plant growth to experimental ecosystem warming. Oecologia, 2001, 126: 543-562.
[6]
Melillo J M, Steudler P A, Aber J D, et al. Soil warming and carbon-cycle feedbacks to the climate system. Science, 2002, 298: 2173-2176.
[7]
Oechel W C, Vourlitis G L, Hastings S J, et al. Acclimation of ecosystem CO2 exchange in the Alaskan Arctic in response to decadal climate warming. Nature, 2000, 406: 978-981.
[8]
Bao Y J, Li Z H, Liu H. The effects of mowing and grazing on energy fixation and allocation of steppe community in Xilinguole, Inner Mongolia. Journal of Dalian, Nationalities University, 2006, 8(1): 9-12.
[9]
Yang J, Xie Y Z, Wu X D, et al. Stoichiometry characteristics of plant and soil in alfalfa grassland with different growing years. Acta Ecologica Sinica, 2014, 23(2): 340-345.
[10]
Lal R. Soil carbon sequestration impacts on global climate change and food security. Science, 2004,304: 1623-1627.
[11]
Chen S Y, Yu H, Feng Q S, et al. Spatial heterogeneity of soil N/P ratio on Gannan Plateau. Acta Ecologica Sinica, 2013, 21(1): 30-36.
[12]
Lin L, Zhang F W, Li Y K, et al. The soil carbon and nitrogen storage and C/N metrological characteristics of chemistry in Kobresia humilis meadow in degradation succession stages. Chinese Journal of Grassland, 2012, 34(3): 42-47.
[13]
Luo Y Y, Zhang Y, Zhang J H, et al. Soil stoichiometry characteristics of alpine meadow at its different degradation stages. Chinese Journal of Ecology, 2012, 31(2): 254-260.
[14]
Deng B. The Study about Change of Vegetation and C∶N∶P Stoichiometry of Soil in Different Succession Stage in Alpine Grassland. Lanzhou: Lanzhou University, 2012.
[15]
Tian Y B, Xiong M B, Xiong X S, et al. The organic carbon distribution and flow in wetland soil-plant system in Ruoergai Plateau. Acta Phytoecologica Sinica, 2003,27(4): 490-495.
[16]
Lv M Z, Sheng L X, Zhang L. A review on carbon fluxes for typical wetlands in different climates of China. Wetland Science, 2013, 11(1): 114-120.
[17]
Cai Q Q. Soil Carbon Storage in Alpine Kobresia Meadows Wetland in Ruoergai, Qinghai-Tibet Plateau. Beijing: Chinese Academy of Forestry, 2012.
[18]
Hu L, Wang C T, Wang G X, et al. Changes in the activities of soil enzymes and microbial community structre at different degradation successional stages of alpineweadows in the headwater region of Three River, China. Acta Prataculturae Sinica, 2014, 23(3): 8-19.
[19]
Tang J, Xu Q R, Wang L M, et al. Soil bacterial community diversity under different stages of degradation in zoige wetland. Microbiology, 2011, 38(5): 677-686.
[20]
Niu J, Zhou X Q, Jiang N, et al. Characteristics of soil microbial communities under dry and wet condition in Zoige alpine wetland. Acta Ecologica Sinica, 2011, 31(2): 0474-0482.
[21]
Wu L S, Tang J, Luo Q, et al. Study on the relationship between soil enzyme activities and soil physico-chemical properties with microorganism of degraded soil from Zoige wetland. Chinese Journal of Soil Science, 2012, 43(1): 52-59.
[22]
Wang D, Lv Y L, Xu L, et al. The effect of moisture and temperature on soil C mineralization in wetland and steppe of the Zoige region, China. Acta Ecologica Sinica, 2013, 33(20): 6436-6443.
[23]
Wang J L, Zhong Z M, Wang Z H, et al. Soil C/P distribution characteristics of alpine steppe ecosystems in the Qinhai-Tibetan Plateau. Acta Prataculturae Sinica, 2014, 23(2): 9-19.
[24]
Zhang T, Weng Y, Yao F J, et al. Effect of grazing intensity on ecological stoichiometry of Deyeuxia angustifolia and meadow soil. Acta Prataculturae Sinica, 2014, 23(2): 20-28.
[25]
Lin D Y, Wang Q B, Bai Z K, et al. The Experimental Guide to the Study of Soil. Beijing: China Forestry Publishing House, 2004: 7.
[26]
Gu Z K, Du G Z, Zhu W X, et al. Distribution pattern of soil nutrients in different grassland types and soil depths in the eastern Tibetan Plateau. Pratacultural Science, 2012, 29(4): 507-512.
[27]
Min A M, Liu M, Wang L, et al. Variation of soil physical and chemical properties in the degradation process of wetland and grassland in Zoigê. Journal of Sichuan Forestry Science and Technology, 2012, 33(2): 46-48.
[28]
Yang C D, Long R J, Chen X R, et al. Characteristics of carbon, nitrogen and phosphorus density in top soil under different alpine grasslands on the eastern Qilian Mountains. Chinese Journal of Grassland, 2008, 30(1): 1-5.
[29]
Yang C D, Chen X R, Long R J, et al. Distribution characteristics of soil nitrogen during the greening period of forage under different alpine grasslands in the eastern Qilian Mountain. Acta Prataculturae Sinica, 2010, 19(1): 67-74.
[30]
Liu M X, Wang G. N and P stoichiometry of plant and soil on slope direction gradient of sub-alpine meadows. Journal of Lanzhou University (Natural Science), 2012, 48(3): 70-75.
[31]
Gao J Q, Ou Y H, Zhang F, et al. Characteristics of spatial distribution of soil organic carbon in Zoige wetland. Ecology and Environment, 2007, 16(6): 1723-1727.
[32]
Gan Y M, Li Z D, Ze B, et al. The changes of grassland soil nutrition at different degradation subalpine meadow of north-west in Sichuan. Acta Prataculturae Sinica, 2005, 14(2): 38-42.
[33]
Zu Y G, Li R, Wang W J, et al. Soil organic and inorganic carbon contents in relation to soil physicochemical properties in northeastern China. Acta Ecologica Sinica, 2011, 31(18): 5207-5216.
[34]
Li W J, Zhang Y M. Impacts of plateau pikas on soil organic matter and moisture content in alpine meadow. Acta Theriologica Sinica, 2006, 26(4): 331-337.
[35]
Zhao Y, Zhang H S, Zhang D G. Impact of zokor on soil nutrients of alpine meadow in Tianzhu. Grassland and Turf, 2009, 5: 17-19.
[36]
Tan X. Study on Spatial Distribution of Soil Phosphorus of Alpine Area in Eastern Qinghai-Tibetan Plateau. Chengdu: Sichuan Normal University, 2009.
[37]
Zhang X R, Ma L S, Chen Y N, et al. Ecological stoichiometry characteristics of robinia pseudoacacia forest soil in different latitudes of Loess Plateau. Acta Pedologica Sinica, 2013, 50(4): 818-825.
[38]
Sun F D, Guo Z G, Shang Z H, et al. Effects of density of burrowing plateau pikas (Ochotona curzoniae) on soil physical and chemical properties of alpine meadow soil. Acta Pedologica Sinica, 2010, 47(2): 378-383.
[39]
Wang C T, Long R J, Wang Q J, et al. Distribution of organic matternitrogen and phosphorus along an altitude gradient and productivity change and their relationships with environmental factors in the Alpine meadow. Acta Prataculturae Sinica, 2005, 14(4): 15-20.
[40]
Cai Q Q, Guo Z H, Hu Q P, et al. Vertical distributin of soil organic carbon and carbon storage under different hydrologic conditions in Zoigê alpine kobresia meadows wetland. Scientia Silvae Sinicae, 2013, 49(3): 9-16.
Wang F G, Wang Q J, Wang W Y, et al. Research progress on soil organic matter. Pratacultural Science, 2008, 25(2): 48-54.
[57]
Zhang X X, Li Z B, Li P, et al. The distribution characteristics of soil organic carbon under different topography of small watersheds on Loess Plateau. Journal of Xi’an University of Technology, 2010, 26(3): 309-313.
[58]
Huang M, Wu J S, Huang Q Y, et al. Process in research on microbiological action of soil phosphorus. Ecology and Environment, 2003, 12(3): 366-370.
[59]
Prescott C E, Chappell N H, Vesterdal L. Nitrongen tumover in forest floors of coastal Douglas-fir at sites differing in soil nitrogen capital. Ecology, 2000, 81: 1878-1886.