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以福建尤溪玉池果园水土流失定位观测点为平台,研究了不同果园垦殖方式对土壤有机碳分布的影响。结果表明,不同垦殖方式下果园土壤有机碳在小生境分布和坡面再分布两个尺度上呈现出不同的分布特征,水平方向上,清耕果园土壤有机碳含量呈沿树干向外减少的分布规律,而生草果园土壤有机碳含量水平变化不明显;垂直方向上,果园土壤有机碳含量随土层加深而逐渐减少;坡面再分布上,清耕果园表现为下坡位>中坡位>上坡位,生草果园为中坡位>下坡位>上坡位。生草垦殖模式降低了果园土壤有机碳的水平分异,但促进果园土壤有机碳的垂直分异。在以上结果的基础上,提出了小生境混合取样的果园土壤采样方法。
Taking the observation site of soil and water loss in Yuxi orchard of Youxi as an example, the effects of different orchards on the distribution of soil organic carbon were studied. The results showed that the soil organic carbon in different orchard reclamation ways had different distribution characteristics in the niche distribution and slope redistribution. In the horizontal direction, the soil organic carbon content in the clear orchard decreased along the trunk But there was no obvious change in the soil organic carbon content in the grass orchard. In the vertical direction, the content of organic carbon in the orchard decreased with the deepening of the soil layer. On the slope redistribution, > Uphill, grass orchard for the slope position> downhill> uphill position. Grassland reclamation mode reduced the level of organic carbon in orchard soil, but promoted the vertical differentiation of soil organic carbon in orchard. Based on the above results, a sampling method of orchard soil sampling with mixed niche sampling was proposed.