岷江流域不同土地利用方式下紫色土壤活性有机碳分布特征及其影响因子

发布时间：2018-05-25 07:15

本文选题：岷江流域 + 土地利用方式　；参考：《水土保持研究》2017年05期

【摘要】：作为土壤质量的重要指标,土壤活性有机碳(SLOC)在土壤许多物理、化学和生物特性中发挥着重要作用。通过对不同土地利用方式土壤进行采样和分析,系统地研究和比较了四川省岷江流域不同土地利用方式(次生林、人工林、灌草丛和坡耕地)SLOC分布特征及其影响因子。结果表明:岷江流域不同土地利用方式土壤机械组成不尽一致,土壤总孔隙度与土壤容重变化趋势相反。不同土地利用方式对土壤养分具有较大影响,土壤有机碳、全氮、全磷和全钾均呈现出一致性规律,大致表现为次生林和灌草丛高于人工林和坡耕地,而不同土地利用方式土壤全磷差异并不显著(p0.05)。不同土地利用方式SLOC均呈现出一致性规律,大致表现为次生林和灌草丛高于人工林和坡耕地。不同土地利用方式SLOC垂直方向随土层深度的增加表现出递增趋势,并且降低幅度逐渐减小,坡耕地、灌草丛、次生林和人工林SLOC从表层至底层逐渐递减,呈"T"形分布,"表聚性"较为明显。人工林、灌草丛和坡耕地在10—20cm SLOC/SOC比例最高,而次生林0—10cm SLOC/SOC比例最高,不同土地利用方式SLOC/SOC比例均在30—40cm最低。相关性分析表明,不同土地利用方式SLOC与SOC和全氮均呈极显著正相关性(p0.01),与土壤容重均呈负相关。表明SLOC受土壤养分和机械组成影响较大,其中SOC和全氮是不同土地利用方式SLOC变化的重要影响因素。SLOC与土壤有机碳之间呈极显著正相关关系(R2=0.9961),说明SLOC能够作为研究不同土地利用方式SOC动态变化的一个敏感性指标而提前反映土壤碳库的动态变化,其含量在很大程度上依赖于所处生境下SOC含量。
[Abstract]:As an important index of soil quality, soil active organic carbon (SLOC) plays an important role in many physical, chemical and biological properties of soil. By sampling and analyzing different land use patterns, the distribution characteristics and influencing factors of SLOC in different land use patterns (secondary forest, artificial forest, shrub grass and sloping farmland) in Minjiang River Basin of Sichuan Province were studied and compared systematically. The results showed that the soil mechanical composition of different land use patterns in Minjiang River Basin was not consistent, and the total porosity of soil was opposite to that of soil bulk density. Soil organic carbon, total nitrogen, total phosphorus and total potassium showed a consistent pattern, which showed that secondary forest and shrub grass were higher than artificial forest and sloping farmland. However, the difference of total phosphorus in different land use patterns was not significant (p 0.05). SLOC of different land use patterns showed a consistent rule, which showed that secondary forest and shrub grass were higher than artificial forest and sloping farmland. The vertical direction of SLOC in different land use patterns showed an increasing trend with the increase of soil depth, and the decreasing amplitude gradually decreased. The SLOC of sloping farmland, shrub grass, secondary forest and plantation decreased gradually from the surface to the bottom. The distribution is "T", and the "apparent aggregation" is obvious. The proportion of 0-10cm SLOC/SOC in plantation, shrub and sloping farmland was the highest in 10-20cm SLOC/SOC, while the proportion of 0-10cm SLOC/SOC in secondary forest was the highest, and the proportion of SLOC/SOC in different land use patterns was the lowest in 30-40cm. Correlation analysis showed that SLOC was positively correlated with SOC and total nitrogen in different land use patterns and negatively correlated with soil bulk density. The results showed that SLOC was greatly affected by soil nutrients and mechanical composition. Among them, SOC and total nitrogen are important influencing factors of SLOC changes in different land use patterns. There is a very significant positive correlation between SLOC and soil organic carbon, indicating that SLOC can be used as a sensitive factor to study the dynamic changes of SOC in different land use patterns. Sensitive indexes reflect the dynamic changes of soil carbon pool in advance, Its content depends on the SOC content in the habitat to a great extent.
【作者单位】：绵阳师范学院资源环境工程学院;
【基金】：国家自然科学基金(41361091,41371486) 生态安全与保护四川省重点实验室基金(ESP201304,QD2014A001)
【分类号】：S153.6

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