Chin J Plan Ecolo ›› 2008, Vol. 32 ›› Issue (6): 1301-1311.doi: 10.3773/j.issn.1005-264x.2008.06.011

• Research Articles • Previous Articles     Next Articles

EFFECTS ON CARBON FLUX OF CONVERSION OF GRASSLAND STEPPE TO CROPLAND IN CHINA

ZHANG Wen-Li1,2; CHEN Shi-Ping2; MIAO Hai-Xia2; LIN Guang-Hui2*   

  1. 1College of Chemistry and Life Science, China Three Gorge University, Yichang, HuBei 443002, China;2State Key Laboratory Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
  • Online:2008-11-30 Published:2008-11-30
  • Contact: LIN Guang-Hui

Abstract: Aims In light of increasing interest in understanding carbon fluxes of terrestrial ecosystems under changing climate and escalating human influences, our study examined the dependence of carbon fluxes on abiotic and biotic factors and explored the effects of conversion of grassland to cropland on eco-system C fluxes.
Methods Our study was carried out in Duolun (42o02′ N, 116o17′ E; 1 350 m asl), a semiarid agriculture-pasture transition region in southeastern Inner Mongolia, China. We used the chamber method during the growing season.
Important findings There was no difference in net ecosystem exchange of carbon dioxide (NEE) between wheat field and steppe at the beginning of the growing season. NEE of wheat field became higher than that of steppe in late June. No differences were found between the two ecosystems from mid-July to August 1st. NEE of wheat field became significantly lower than that of steppe starting in mid-August. During the growing season, the maximum of NEE in steppe was –11.26 µmol CO2•m–2•s–1, while that in wheat field was –12.29 µmol CO2•m–2•s–1. Mean NEE in steppe (–5.33 µmol CO2•m–2•s–1) was a little lower than that in wheat field (–7.66 µmol CO2•m–2•s–1). Leaf area index (LAI) was the main factor controlling NEE of the two ecosystems. Poor soil nutrient levels also might limit NEE in these ecosystems. Because of characteristics of wheat, the sensitivity of NEE response to LAI was lower in wheat field than steppe in the middle and late growing season. Lower soil volume water content (10 cm depth) in wheat field limited total ecosystem respiration (TER) and decreased the sensitivity of TER to temperature.

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[2] Cai Ji-jiong and Wang Zi-qing. A Preliminary Report on Pollen Morphology and Constituent of Pinus massoniana[J]. Chin Bull Bot, 1988, 5(03): 167 -169 .
[3] Zhang Fu-ren and Mo Ri-gen. A Simple Technique for Observing Fracture Surface of Pollen Grains by SEM[J]. Chin Bull Bot, 1992, 9(03): 63 -64 .
[4] MA Yue-Ping CHEN Fan DAI Si-Lan. Studies of LEAFY Homologue Genes in Higher Plants[J]. Chin Bull Bot, 2005, 22(05): 605 -613 .
[5] Lin Zhong-Ping. Isolating of DNA from Plant Materials[J]. Chin Bull Bot, 1984, 2(04): 44 -46 .
[6] Liu Rong-zhen and Wang Hou. The Effect of Ammonia Humic Acid Fertilizers on the Activity of End-Group Oxidase of Rice Seeding in Sludge[J]. Chin Bull Bot, 1985, 3(06): 21 -23 .
[7] LI Xin-Rong;CHEN Zhong-Xin;CHEN Xu-Dong and DONG Xue-Jun. Study on the Interconnections Among Several Communities of Desert Shrubs in West Ordos Plateau[J]. Chin Bull Bot, 1998, 15(01): 56 -62 .
[8] Li Ru-juan;Shang Zong-yan and Zhang Ji-zu. The Chromosome Observation on 3 Species in the Genus Gynostemma[J]. Chin Bull Bot, 1989, 6(04): 245 -247 .
[9] Tai Wang;Qian Qian;Ming Yuan;Xiaojing Wang;Weicai Yang;Lijia Qu;Hongzhi Kong;Yinong Xu;Gaoming Jiang;Kang Chong. Research Advances on Plant Science in China in 2009[J]. Chin Bull Bot, 2010, 45(03): 265 -306 .
[10] Zhou Jilun. An Approach on the Multifactors of Ecological Systematic Analysis of Vegetation-A Review for the Works of 《Classification of Plant Communities》 by Whittaker R.H.[J]. Chin J Plan Ecolo, 1981, 5(2): 159 .