Losses in Carbon and Nitrogen Stocks in Soil Particle-Size Fractions along Cultivation Chronosequences in Inner Mongolian Grasslands
文献类型：SCI/SSCI论文
| 作者 | He N. P. ; Zhang Y. H. ; Dai J. Z. ; Han X. G. ; Yu G. R. |
| 发表日期 | 2012 |
| 关键词 | organic-matter land-use dynamics china management ecosystems pools sequestration conversion turnover |
| 英文摘要 | Cultivation in semiarid grasslands induces large changes in soil organic matter (SOM) stock. To better predict the effects of cultivation on SOM pools, there is a need to identify the soil fractions that are affected and the extent to which they are affected. Using four cultivation chronosequences in Inner Mongolian grasslands of northern China, we investigated the changes in soil organic carbon (SOC) and total nitrogen (N) stocks in soil particle-size fractions to identify the effect of cultivation on SOM dynamics. The results showed that conversion of native grasslands into croplands significantly decreased the SOC stocks (4.34-31.65 Mg C ha(-1)) and N (0.19-2.54 Mg N ha(-1)) in the 0- to 100-cm layer aft er cultivation. Prominent changes were observed in the SOC and N stocks in the 0- to 10-cm layer and were, on average, 6.56 Mg C ha(-1) (24.85%) and 0.63 Mg N ha(-1) (23.48%), respectively. The effect of cultivation on the SOC and N stocks in soil fractions was in the order sand > silt > clay. The C and N stocks in the 0-to 10-cm soil layer in the sand fraction in croplands decreased, on average, by 4.74 Mg C ha(-1) (35.86%) and 0.48 Mg N ha(-1) (41.30%), respectively, compared with those in native grasslands. The declines in the silt and clay fractions were small. Thus, sand fraction was a more important contributor to C and N losses in soil aft er cultivation than silt or clay fraction. Our findings indicate that the preliminary responses of SOC and N to cultivation in a semiarid grassland area and have significant implications for assessing the loss or gain of C and N during grassland conversion. |
| 出处 | Journal of Environmental Quality |
| 卷 | 41 |
| 期 | 5 |
| 页 | 1507-1516 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0047-2425 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/30861]  |
| 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 | He N. P.,Zhang Y. H.,Dai J. Z.,et al. Losses in Carbon and Nitrogen Stocks in Soil Particle-Size Fractions along Cultivation Chronosequences in Inner Mongolian Grasslands. 2012. |
入库方式： OAI收割
来源：地理科学与资源研究所
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