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选取黑河绿洲区典型土壤类型为研究对象,分析耕作对土壤粒径分布及其与土壤总有机碳、活性有机碳、惰性有机碳关系的影响。结果显示:非耕地(灰钙土、灰褐土、栗钙土)转变为耕地后,改变了10～50μm粗粉粒、50～250μm细砂粒、250～1000μm粗砂粒的含量,对<5μm的粘粒含量影响小。而风沙土变为耕地土壤后,土壤颗粒出现了细化现象。土壤粒径分布的变化也波及到了土壤颗粒与有机碳的关系,耕地与非耕地中存在异同点。相同之处在于,以50μm作为分界点,土壤总有机碳、活性有机碳、惰性有机碳与<50μm的粉粒、粘粒土壤颗粒含量呈正相关,与>50μm的砂粒呈负相关。不同之处为:耕地中土壤有机碳仅与5～10μm、10～50μm、50～250μm有关;非耕地中土壤有机碳与<1μm、1～5μm、5～10μm、10～50μm、50～250μm、250～1000μm的含量有关。分析表明,耕作是引起土壤活性有机碳增加及土壤有机碳与土壤粒径之间的关系发生变化的内在原因。
The typical soil types in the oasis area of Heihe were selected as the research object to analyze the effect of tillage on the distribution of soil particle size and its relationship with soil total organic carbon, active organic carbon and inert organic carbon. The results showed that the contents of 10-50 μm coarse grain, 50-250 μm fine grain, 250-1000 μm coarse grit were changed after non-cropland conversion (Cg, Cinnamon, Chestnut soil) Clay content has little effect. After the wind-blown soil changed to cultivated soil, the soil particles appeared thinning phenomenon. Changes in soil particle size distribution also affect the relationship between soil particles and organic carbon, there are similarities and differences between cultivated land and non-cultivated land. The same thing is that, with 50μm as the cut-off point, soil total organic carbon, active organic carbon and inert organic carbon have a positive correlation with the content of <50μm particles and clay particles, but negatively correlated with> 50μm particles. The differences are as follows: soil organic carbon in arable land is only related to 5 ~ 10μm, 10 ~ 50μm, 50 ~ 250μm; soil organic carbon in non-cultivated land is related to <1μm, 1-5μm, 5-10μm, , 250 ~ 1000μm content. The analysis shows that tillage is the intrinsic reason for the change of soil active organic carbon and the relationship between soil organic carbon and soil particle size.