种群的死亡过程和繁殖过程使种群平均密度有较明显的波动，但对种群总体水平无明显影响，种群结构也无明显变化。
The death and reproduction of the population make the mean density fluctuate but do not obviously change the overall level of population number and the population structure.
结果表明，总体上我国实测点位（或区域）耕作土壤平均有机碳密度在此期间略有增加。
The results show that the average organic carbon density in cultivated soils has experienced a carbon gain during the period.
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