Effect of the conversion of grassland to spring wheat field on the CO | |
Dong Yun-She; Geng Yuan-Bo; Liu Ji-Yuan; Qi Yu-Chun | |
2007 | |
关键词 | Agriculture Cultivation Ecosystems Organic carbon Soils |
英文摘要 | Chinese grasslands have undergone great changes in land use in recent decades. Approximately 18.2% of the present arable land in China originated from the cultivation of grassland, but its impact on the carbon cycle has not been fully understood. This study was conducted in situ for 3 years to assess the comprehensive effects of cultivation of temperate steppe on soil organic carbon (SOC) and soil respiration rates as well as ecosystem respiration. As compared with those in the Stipa baicalensis steppe, the SOC concentrations at depths of 0-10 and 10-20 cm in the spring wheat field were found to have decreased by 38.3 and 17.4% respectively from 29.5 and 21.9 g kg-1 to 18.2 and 18.1 g kg-1 after a cultivation period of 30 years. Accordingly, the total amounts of soil respiration through the growing season (from April to September) in 2002, 2003 and 2004 were 265.2, 282.2 and 237.4 g C m-2 respectively in the spring wheat field, which were slightly lower than the values of 342.2, 412.0 and 312.1 g C m-2 in the S. baicalensis steppe, while ecosystem respiration of 690.9, 991.2 and 569.6 g C m-2 respectively in the spring wheat field were markedly higher than those of 447.0, 470.9 and 429.7 g C m-2 in the steppe plot. Similar seasonal variations of ecosystem respiration and soil respiration existed in both sample sites. Respiration rates were higher and greater differences existed in both ecosystem respiration and soil respiration during the exuberant growth stage of plants (from mid-June to mid-August). However, in the slower-growth period of the growing season (before late May and after late August), the CO |
出处 | Soil and Tillage Research |
卷 | 94期:2页:310-320 |
收录类别 | EI |
语种 | 英语 |
内容类型 | EI期刊论文 |
源URL | [http://ir.igsnrr.ac.cn/handle/311030/24662] |
专题 | 地理科学与资源研究所_历年回溯文献 |
推荐引用方式 GB/T 7714 |
Dong Yun-She,Geng Yuan-Bo,Liu Ji-Yuan,et al. Effect of the conversion of grassland to spring wheat field on the CO |
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