土地覆盖类型对科尔沁沙地南缘土壤有机碳储量的影响

doi:10.7522/j.issn.1000-694X.2015.00101

摘要/Abstract

摘要： 研究了科尔沁沙地南缘土地覆盖由流动沙地向人工林地、农田及固定沙地等转变后，0~60 cm土层有机碳储量的变化。结果表明：农田土壤有机碳含量增加最明显，为流动沙地的3.97倍且相同层间差异均显著；樟子松（Pinus sylvestris var. mongolica）林地、新疆杨（Populus alba var. pyramidalis）林地、小叶锦鸡儿（Caragana microphylla）群落土壤有机碳含量较流动沙地分别增加79.78%、138.20%、73.07%，差异主要在0~20 cm土层；围封草地和中度放牧草地分别增加116.85%和133.71%，差异主要在0~40 cm土层；固定沙地比流动沙地增加49.44%，差异主要在0~20 cm土层。土地覆盖类型转变后，由于受到土壤容重的影响，土壤有机碳密度在0~20 cm土层变化较明显。8种土地覆盖类型可分为4组：CL1（农田）、CL2（新疆杨林地、围封草地、中度放牧草地）、CL3（樟子松林地、小叶锦鸡儿群落、固定沙地）和CL4（流动沙地）。另外，土壤有机碳含量和密度在土壤剖面上的分布也随着土地覆盖类型的变化而不同。

关键词: 土地覆盖, 土壤有机碳, 碳密度, 科尔沁沙地

Abstract: The influence of land cover change on soil organic carbon (SOC) inventory from shifting sandy to other land cover types was investigated by comparing the concentration and its distribution in soil profile under the artificial forest (Populus alba var. pyramidalis, Pinus sylvestris var. mongolica, Caragana microphylla), fenced land, moderate grazing land, cropland (maize) and fixed sandy land, which have been established on shifting sandy land for about 25 years. The increase of SOC content in 0-60 cm soil profile among all the cover types was found under cropland, which was 3.97 times that of shifting land, additionally, significant differences were observed at each soil layer between cropland and shifting land. SOC content within the whole profile is 80%, 138% and 73% higher under three types vegetation of artificial forest than that of shifting sandy land, respectively. The difference of SOC content between artificial forest and shifting sandy land was greater in 0-20 cm than in 20-60 cm soil layer, while that between fenced land and shifting sandy land was greater in 0-40 cm than in 40-60 cm soil layer. Variation of soil organic carbon density (SOCD) was similar to that of soil organic carbon content. The main differences are concentrated in 0-20 cm soil layer which is mostly caused by the soil bulk density. Average cluster analysis on SOCD indicated that eight land cover types could be divided into four groups:CL1 (cropland), CL2 (P. alba var. pyramidalis, fenced land, moderate grazing land), CL3 (P. sylvestris var. mongolica, C. microphylla, fixed sandy land) and CL4 (shifting sandy land). In conclusion, the distribution of SOC concentration or inventory in soil profile would change with the alternation of land cover in the southern Horqin Sandy Land.

Key words: land cover, soil organic carbon, carbon concentration, Horqin Sandy Land

中图分类号:

S153.6

高亮, 高永, 王静, 罗凤敏, 吕新丰. 土地覆盖类型对科尔沁沙地南缘土壤有机碳储量的影响[J]. 中国沙漠, 2016, 36(5): 1357-1364.

Gao Liang, Gao Yong, Wang Jing, Luo Fengmin, Lü Xinfeng. Impact of Land Cover Change on Soil Carbon Storage in the Southern Horqin Sandy Land, Inner Mongolia[J]. JOURNAL OF DESERT RESEARCH, 2016, 36(5): 1357-1364.

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