土地利用对陕北水土流失区土壤有机碳、水分的影响

Effect of land utilization on soil organic carbon and soil moisture in water erosion areas of North Shan'xi

通过实地调查和采样,结合室内分析,研究了当地四种土地利用方式(果园、林地、草地、坡耕地)下土壤有机碳分布特征。结果表明:流域内所有土样土壤有机碳(SOC)含量的均值为13.13g.kg-1。其中,坡耕地的土壤有机碳均值为12.93g.kg-1,与坡耕地相比,果园土壤有机碳均值(12.97g.kg-1)略有升高;草地和林地分别比坡耕地高3.4和1.16%。林地、草地、坡耕地和果园的土壤有机碳均值无显著差异。各种方式下的土壤有机碳和含水量均有较强的线性相关性。根据实验数据和野外实地调研结果看出,本区林地和草地土壤的固碳能力强于果园和坡耕地,为当地水土流失治理提供了一定的科学依据。

Through field surveys and sampling,combined with laboratory analysis,the characteristics of soil organic carbon content about local four kinds of lands（orchard,woodland,grassland,slope farmland） were studied.The experiments indicated that the mean of organic carbon of all soil sampling area（SOC）were 13.13g·kg^-1.Among them,the mean of slope farmland organic carbon were 12.93gg·kg^-1,compared with the slope farmland,orchard soil organic carbon mean（12.97g·kg^-1） was slightly higher than it,that of grassland and forest land were higher than the slope farmland by 3.4% and1.16%.The mean of soil organic carbon among orchard,woodland,grassland,slope farmland was no significant difference.In various forms of land uses the soil organic carbon and water content had a strong linear correlation.According to this experimental data and field research,the ability of carbon fixation in woodland and grassland soil carbon was stronger than that in orchard and slope farmland.This result provided some scientific basis for local soil erosion.