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以福建尤溪玉池生草果园定位观测点为平台,研究了生草栽培对果园土壤团聚体有机碳分布的影响。结果表明,生草栽培处理后,0~20 cm土壤团聚体中>0.25 mm水稳性团聚体的比例(R0.25)、平均重量直径(MWD)和几何平均直径(GWD)分别比顺坡清耕和梯台清耕处理的高3.78%~5.90%、16.82%~20.94%、5.86%~50.31%和3.81%~13.82%、13.33%~19.95%、7.50%~60.63%,分形维数比顺坡清耕和梯台清耕处理的低1.54%~2.35%和1.09%~9.64%。同时,生草栽培可提高>2 mm土壤团聚体内有机碳贮量和大团聚体有机碳贮量占总有机碳的比例,但其影响主要集中于0~20 cm土层。这说明生草栽培处理更有利于提高土壤团聚体稳定性,增强土壤有机碳的保护和碳汇作用。
Taking the observation and observation point of grass orchard in Yuxi, Fujian as an example, the effect of sward cultivation on organic carbon distribution in orchard soil aggregates was studied. The results showed that the ratio of R0.25, MWD and GWD of> 0.25 mm water-stable aggregates in 0-20 cm soil aggregates were significantly higher The tillage and terrace tillage treatments were 3.78% ~ 5.90%, 16.82% ~ 20.94%, 5.86% ~ 50.31% and 3.81% ~ 13.82%, 13.33% ~ 19.95% and 7.50% ~ 60.63% Landslope tillage and tillage tillage treatment of low 1.54% ~ 2.35% and 1.09% ~ 9.64%. At the same time, planting grass could increase the organic carbon storage and organic carbon storage in the aggregates> 2 mm as a percentage of total organic carbon, but the effects mainly concentrated on 0-20 cm soil layer. This shows that the grass planting treatment is more conducive to improving the stability of soil aggregates and enhance soil organic carbon conservation and carbon sink.