Liu Jia-Bin, Zhang Yu-Qing, Wu Bin, Qin Shu-Gao, Jia Xin, Fa Ke-Yu, Feng Wei, Lai Zong-Rui
a Yanchi Research Station, College of Soil and Water Conservation , Beijing Forestry University , Beijing , China.
Int J Phytoremediation. 2015;17(1-6):529-37. doi: 10.1080/15226514.2014.922923.
Although vegetation rehabilitation on semi-arid and arid regions may enhance soil carbon sequestration, its effects on soil carbon fractions remain uncertain. We carried out a study after planting Artemisia ordosica (AO, 17 years), Astragalus mongolicum (AM, 5 years), and Salix psammophila (SP, 16 years) on shifting sand land (SL) in the Mu Us Desert, northwest China. We measured total soil carbon (TSC) and its components, soil inorganic carbon (SIC) and soil organic carbon (SOC), as well as the light and heavy fractions within soil organic carbon (LF-SOC and HF-SOC), under the SL and shrublands at depths of 100 cm. TSC stock under SL was 27.6 Mg ha(-1), and vegetation rehabilitation remarkably elevated it by 40.6 Mgha(-1), 4.5 Mgha(-1), and 14.1 Mgha(-1) under AO, AM and SP land, respectively. Among the newly formed TSC under the three shrublands, SIC, LF-SOC and HF-SOC accounted for 75.0%, 10.7% and 13.1% for AO, respectively; they made up 37.0%, 50.7% and 10.6% for AM, respectively; they occupied 68.6%, 18.8% and 10.0% for SP, respectively. The accumulation rates of TSC within 0-100 cm reached 238.6 g m(-2) y(-1), 89.9 g m(-2) y(-1) and 87.9 g m(-2) y(-1) under AO, AM and SP land, respectively. The present study proved that the accumulation of SIC considerably contributed to soil carbon sequestration, and vegetation rehabilitation on shifting sand land has a great potential for soil carbon sequestration.
虽然半干旱和干旱地区的植被恢复可能会增强土壤碳固存，但其对土壤碳组分的影响仍不确定。在中国西北部毛乌素沙地的流动沙地（SL）上种植油蒿（AO，17年）、蒙古黄芪（AM，5年）和沙柳（SP，16年）后，我们开展了一项研究。我们测量了100厘米深度内流动沙地和灌木林地土壤总碳（TSC）及其组分、土壤无机碳（SIC）和土壤有机碳（SOC），以及土壤有机碳中的轻组分和重组分（LF-SOC和HF-SOC）。流动沙地的TSC储量为27.6 Mg ha(-1)，植被恢复显著提高了TSC储量，在油蒿地、蒙古黄芪地和沙柳地分别提高了40.6 Mg ha(-1)、4.5 Mg ha(-1)和14.1 Mg ha(-1)。在三种灌木林地新形成的TSC中，SIC、LF-SOC和HF-SOC在油蒿地分别占75.0%、10.7%和13.1%；在蒙古黄芪地分别占37.0%、50.7%和10.6%；在沙柳地分别占68.6%、18.8%和10.0%。0至100厘米深度内TSC的积累速率在油蒿地、蒙古黄芪地和沙柳地分别达到238.6 g m(-2) y(-1)、89.9 g m(-2) y(-1)和87.9 g m(-2) y(-1)。本研究证明，SIC的积累对土壤碳固存贡献显著，流动沙地的植被恢复具有巨大的土壤碳固存潜力。
