黔中石漠化地区生态恢复过程中土壤养分变异特征

Soil Nutrient Variation Features in Rocky, Desertified Areas Undergoing Ecological Restoration in Central Guizhou Province

黔中石漠化地区由于近年来农村经济水平的发展,以及劳动力的大量转移,农村人口对土地的依赖性减小,使得原有部分石漠化地区处于一种自然或半自然的恢复状态。基于这种研究背景下,采集了黔中石漠化地区处于恢复过程中的土壤表层样品,进行室内理化分析。结果显示,土壤有机质、全氮的累积量较多,并以无明显石漠化地区土壤含量最高,中度石漠化地区土壤含量最低。土壤全磷、全钾由于受到土壤母质条件的影响,其变异较土壤有机质和氮素趋于平缓。土壤有效氮、钾含量水平较高,而有效磷含量水平处于极低状态。

Central Guizhou Province, where the economic development is being promoted, is receiving an influx of rural labor workers. The dependence of the rural population on land is declining. Consequently, some areas that had become rocky and desertified are in a process of recovery. With this background, the author gathered soil samples of surface layers and carried out chemical analyses. The results show: the accumulated quantity of soil organic matter and N is higher, and it is highest in areas without obvious rocky desertification and lowest in areas with moderate desertification evident. Bedrock material slightly influences the variation in total P and K. The amount of rapidly available N and K is high, while the amount of rapidly available P is very low.