Lan Zhi-Long, Zhao Ying, Zhang Jian-Guo, Li Hui-Jie, Si Bing-Cheng, Jiao Rui, Muhammad Numan Khan, Tanveer Ali Sial
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, College of Natural Resource and Environment, Northwest A&F University,Yangling 712100, China.
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China.
Huan Jing Ke Xue. 2018 Jan 8;39(1):339-347. doi: 10.13227/j.hjkx.201704157.
Carbon storage in the Loess Plateau is affected by land use. In order to assess the differences in soil organic carbon (SOC) and soil inorganic carbon (SIC) under different land use patterns in deep soil profiles, we investigated the distribution characteristics of SOC and SIC at 0-20.0 m soil depth at three locations in the northern Shaanxi province (i.e., an economical plantation in Mizhi, a reforestation area in Shenmu, and a wind break and sand fixation forest district in Yuyang). The results showed that the order for SOC content was:pruning jujube tree (2.00 g·kg) > jujube tree (1.54 g·kg) > Caragana (0.97 g·kg) > degraded artificial grassland (0.81 g·kg) > pine forests (0.70 g·kg) > natural grass field (0.45 g·kg), which indicated significant differences between SOC content and land use types (<0.05). Similarly, the order of SIC content was:pruning jujube tree (11.66 g·kg) > jujube tree (11.59 g·kg) > Caragana (9.62 g·kg) > degraded artificial grassland (8.07 g·kg) > pine forests (4.32 g·kg) > natural grass field (0.47 g·kg). There were no significant differences between SIC content and soil profiles under the economical plantation of Mizhi and the reforestation area of Shenmu. There were significant differences for SIC content between an artificial economic forest, an area returning farmland to a forest (grass) profile, and a windbreak and sand fixation forest (<0.05). The SIC densities for pruning jujube tree, jujube tree, Caragana, degraded artificial grassland, pine forest, and natural grass field were 6.19, 7.71, 10.70, 10.78, 5.91, and 1.03 times that of its corresponding SOC density, respectively. It has been concluded that the soil carbon storage was significantly different for different land use patterns, and the SIC content was much higher than the SOC content in the soil profile.
黄土高原的碳储量受土地利用方式的影响。为了评估深层土壤剖面中不同土地利用模式下土壤有机碳（SOC）和土壤无机碳（SIC）的差异，我们调查了陕西省北部三个地点（即米脂的经济林种植地、神木的造林区和榆阳的防风固沙林区）0至20.0米土壤深度处SOC和SIC的分布特征。结果表明，SOC含量顺序为：修剪枣树（2.00克·千克）＞枣树（1.54克·千克）＞柠条（0.97克·千克）＞退化人工草地（0.81克·千克）＞松林（0.70克·千克）＞天然草地（0.45克·千克），这表明SOC含量与土地利用类型之间存在显著差异（＜0.05）。同样，SIC含量顺序为：修剪枣树（11.66克·千克）＞枣树（11.59克·千克）＞柠条（9.62克·千克）＞退化人工草地（8.07克·千克）＞松林（4.32克·千克）＞天然草地（0.47克·千克）。米脂经济林种植地和神木造林区下SIC含量与土壤剖面之间无显著差异。人工经济林、退耕还林（草）剖面和防风固沙林之间SIC含量存在显著差异（＜0.05）。修剪枣树、枣树、柠条、退化人工草地、松林和天然草地的SIC密度分别是其相应SOC密度的6.19、7.71、10.70、10.78、5.91和1.03倍。研究得出结论，不同土地利用模式下土壤碳储量存在显著差异，且土壤剖面中SIC含量远高于SOC含量。
