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采用物理分组方法分析了长期(1990—2007年)不同施肥条件下灰漠土各粒径矿物颗粒结合有机碳含量和分布差异及其随施肥时间的演变特征.结果表明:与不施肥相比,配施有机肥对增加各有机碳组分的效果最显著,并以砂粒有机碳含量的增速(0.34g.kg-1.a-1)最高,对施肥最敏感;撂荒地可以显著增加不同黏粉粒结合有机碳含量;秸秆还田仅能维持各级矿物颗粒结合有机碳的含量;长期施用化肥不利于各级颗粒结合有机碳含量的增加.从分配比例来看,以粗粉粒(27.9%)和粗黏粒(27.1%)有机碳所占比例最高,是固持有机碳的重要组分;配施有机肥使砂粒有机碳比例显著提高119.4%,细粉粒和粗黏粒有机碳比例却分别降低了40.3%和37.9%,从而提高了颗粒有机碳含量(WPOC)与矿物结合有机碳含量(WMOC)的比值,改良了土壤有机碳性质.长期配施有机肥是增加灰漠土各级矿物颗粒结合有机碳积累和提升灰漠土肥力的最佳方式.
The physical grouping method was used to analyze the differences of the content and distribution of bound organic carbon and their evolution along with the fertilization time in the long-term (1990-2007) different fertilization conditions.The results showed that compared with no fertilization, The application of organic fertilizer had the most significant effect on increasing the content of each organic carbon component, and was the most sensitive to fertilization with the increase of organic carbon content (0.34g.kg-1.a-1) Sticky grain combined with organic carbon content; straw returning to the field can only maintain the content of organic carbon at all levels of mineral particles; long-term application of fertilizers is not conducive to all levels of particulate organic carbon content increases.From the distribution ratio, 27.9%) and coarse clay (27.1%) had the highest proportion of organic carbon, which was an important component of organic carbon. With the application of organic fertilizer, the proportion of organic carbon in sand was significantly increased by 119.4%. Fine and coarse clay organic carbon But decreased by 40.3% and 37.9%, respectively, which improved the ratio of WPOC to WMOC and improved the organic carbon in soil.Long-term application of organic fertilizer increased the content of gray desertified soil At all levels of mineral particles combined with organic carbon accumulation and Best Mode liters of gray desert soil Fertility.