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为了了解不同人为干扰形式对典型草原碳贮量的影响,对采取了不同干扰形式(包括开垦、放牧、禁牧2年、禁牧7年和禁牧17年)的典型草原试验样地的土壤碳密度及总碳贮量进行了研究。研究结果表明,0~20 cm深土层土壤碳密度在不同干扰之间表现出明显差异(F=78.702,P<0.000 1),其由大到小的排列顺序为禁牧17年>禁牧7年>禁牧2年>放牧>开垦,分别为4.47、4.23、4.01、3.7和2.27 kg/m2;0~50 cm土层土壤碳密度除开垦明显低于干扰形式以外,几种干扰间没有表现出明显差异;人为干扰对土壤碳密度的影响主要表现在土壤的表层(0~20 cm),对深层土壤的影响不明显。不同干扰形式下碳贮量中都以土壤碳库占有最大的比重,一般在86%~93%之间;根系所占比重在6%~13%之间;植物地上部分所占比重与枯落物大致相当,一般低于1%(开垦除外)。基于0~20 cm土壤碳密度计算的总碳贮量分别为5.74 kg/m2(禁牧17年)、5.22 kg/m2(禁牧7年)、4.83 kg/m2(禁牧2年)、4.39 kg/m2(放牧)、2.67 kg/m2(开垦),不同干扰类型间达到了显著差异(F=8.711,P<0.01);基于0~50 cm土壤碳密度计算的总碳贮量也表现出相同的变化趋势。本研究得出如下结论:人为干扰对典型草原土壤碳密度及总碳贮量具有明显影响,即开垦和放牧导致土壤碳密度和总碳贮量明显下降,而禁牧则可以提高土壤碳密度及碳贮量。因此,从提高碳贮量的角度来看,应该严格禁止典型草原的开垦行为,鼓励实行适当的禁牧制度。
In order to understand the impact of different forms of human disturbance on the typical carbon storage of grassland, soil samples from typical grassland plots with different forms of disturbance (including reclamation, grazing, grazing ban for 2 years, grazing ban for 7 years and grazing ban for 17 years) Carbon density and total carbon storage were studied. The results showed that there was a significant difference in soil carbon density (0 ~ 20 cm depth) between different disturbances (F = 78.702, P <0.0001) 7 years> no grazing> 2 years> grazing> reclamation, respectively 4.47, 4.23, 4.01, 3.7 and 2.27 kg / m2. Soil carbon density in 0 ~ 50 cm soil layer was significantly lower than that of reclamation except for the reclamation, Showing obvious differences. The influence of anthropogenic disturbance on soil carbon density is mainly in the surface layer of soil (0 ~ 20 cm), but not obvious in deep soil. Under the different forms of disturbance, the largest proportion of soil carbon stocks is in the carbon stocks, which is generally between 86% and 93%; the root system accounts for 6% to 13%; the proportion and litter Things roughly the same, generally less than 1% (except for reclamation). Total carbon storage based on soil carbon density at 0-20 cm soil depth was 5.74 kg / m2 (forbidden grazing for 17 years), 5.22 kg / m2 (forbidden grazing for 7 years), 4.83 kg / m2 (F = 8.711, P <0.01). The total carbon storage based on soil carbon density at 0 ~ 50 cm also showed a significant difference The same trend. The study concluded that anthropogenic disturbances had a significant effect on soil carbon and total carbon stocks in typical grasslands, ie, land reclamation and grazing resulted in a significant decrease in soil carbon and total carbon stocks, while forbidden grazing could increase soil carbon density and total carbon storage Carbon storage. Therefore, from the perspective of increasing carbon storage, we should strictly forbid the reclamation of typical grasslands and encourage the implementation of the appropriate grazing ban system.