Effects of grassland conversion to croplands on soil organic carbon in the temperate Inner Mongolia.
Effects of grassland conversion to croplands on soil organic carbon in the temperate Inner Mongolia.
复制标题
DOI：
10.1016/j.jenvman.2006.12.004
复制
发表时间：
2008-02
影响因子：
8.7
通讯作者：
Zhi-Ping Wang;Xingguo Han;Linghao Li
中科院分区：
文献类型：
--
作者：
Zhi-Ping Wang;Xingguo Han;Linghao Li
采用野外直接采样法研究了内蒙古典型草原区退耕还草对土壤有机碳的影响。结果表明，土壤有机碳含量一般随土层深度的增加而降低，上层（0- 30 cm）与下层（30- 100 cm）差异显著。土壤有机碳密度随土层深度的增加而降低。荒漠草地-农田（1号和2号样地）和草甸-农田（3号和4号样地）上层土壤有机碳密度平均值分别为2.6-3.7和6.0-8.3kgCm-2，草地和农田间差异显著（P<0.05）。然而，土壤有机碳密度在底层地平线之间的土地利用没有显着差异。100 cm深度的土壤有机碳密度在草甸-农田中比在荒漠草地-农田中高得多，分别达到约16和6 kgCm-2。土壤有机碳与总氮的比值约为10，草地与农田土壤层位间差异不显著。在温带内蒙古，草地转变为农田导致了轻微的SOC损失，在大约35年的时间里，0- 100 cm土壤深度的SOC损失范围为-4%至22%。
This study investigated the effects of grassland conversion to croplands on soil organic carbon (SOC) in a typical grassland-dominated basin of the Inner Mongolia using direct field samplings. The results indicated that SOC contents decreased usually with increasing soil depth, with significant differences between the upper horizons (0–30cm) and the underlying horizons (30–100cm). Also, SOC densities decreased with an increase in the depth of soils. Average SOC densities in the upper horizons were 2.6–3.7 and 6.0–8.3kgCm−2for desert grassland–cropland sites (sites 1 and 2) and meadow–cropland sites (sites 3 and 4), respectively, with significant differences between grasslands and croplands (P<0.05). However, the SOC densities in the underlying horizons did not significantly differ between the land uses. The SOC densities up to 100cm depth were much higher in the meadow–cropland sites than in the desert grassland–cropland sites, reaching approximately 16 and 6kgCm−2, respectively. The SOC: total nitrogen (TN) ratios were approximately 10, with no significant difference among the soil horizons of grasslands and croplands. The conversion of grasslands to croplands induced a slight loss of SOC, with a range of from −4% to 22% for the 0–100cm soil depth over about a 35-year period, in the temperate Inner Mongolia.