林农复合对沙地樟子松人工林土壤团聚体、有机碳及微生物生物量碳分配的影响

发布时间：2018-08-04 20:55

【摘要】：为探究林农复合对土壤团聚体、土壤有机碳、土壤微生物生物量碳的影响,在辽西地区选取樟子松-花生、樟子松-谷子、樟子松纯林(对照)为研究对象,对其土壤团聚体、团聚体有机碳、土壤微生物生物量碳以及土壤有机碳含量及其分布特征进行研究。结果表明:(1)研究区土壤团聚体以0.053~0.25 mm粒级为主,占团聚体总量的37%~45%,其中樟子松-谷子的大团聚体(0.25 mm粒级)含量最高。(2)两种林农复合各粒级团聚体有机碳含量变化显著不同(P0.05),樟子松-花生团聚体有机碳随粒径增大呈现"倒N"型分布,而樟子松-谷子土壤团聚体有机碳随粒径增大呈现"N"型分布。(3)0~20 cm表层土壤微生物生物量碳和有机碳含量大小顺序为:樟子松-谷子樟子松纯林樟子松-花生。(4)试验区土壤有机碳的积累主要受0.053~0.25 mm和2 mm粒级团聚体含量的影响;另外,0~50 cm土壤剖面微生物生物量碳和有机碳相关分析表明,樟子松-谷子土壤微生物生物量碳与有机碳具显著相关性,而在樟子松-花生复合林地内无显著相关性;这说明不同营林措施对土壤有机碳和微生物的影响存在差异。综上,辽西地区樟子松-谷子复合措施有利于改善土壤结构,促进大团聚体的形成,对提高土壤保水、供肥能力,实现对土壤的保护和可持续利用具有较为明显的作用。
[Abstract]:In order to investigate the effects of agroforestry on soil aggregate, soil organic carbon and soil microbial biomass carbon, the pure forest (control) of Pinus sylvestris var. mongolica, Pinus sylvestris var. mongolica and Pinus sylvestris var. mongolica were selected in western Liaoning Province. The content and distribution of aggregate organic carbon, soil microbial biomass carbon and soil organic carbon were studied. The results showed that: (1) the soil aggregates in the study area were mainly 0. 053 ~ 0. 25 mm grain size. The content of large aggregates (0.25 mm grain) of Pinus sylvestris mongolica and millet was the highest. (2) the content of organic carbon in the aggregates of the two kinds of forest and agriculture was significantly different (P0.05), and the organic carbon content of the aggregates of Pinus sylvestris and Peanut was different with the particle size. The enlargement shows "inverted N" distribution, But organic carbon of soil aggregate of Pinus sylvestris var. mongolica and millet seed soil showed "N" type distribution with the increase of particle size. (3) the order of microbial biomass carbon and organic carbon content in surface soil of 0 ~ (20) cm was as follows: Pinus sylvestris var.mongolica and Pinus sylvestris var. mongolica forest pure pine and peanut. (4) A trial was conducted. The accumulation of soil organic carbon was mainly affected by the content of 0. 053 0. 25 mm and 2 mm aggregates. In addition, the correlation analysis of microbial biomass carbon and organic carbon in 50cm soil profile showed that soil microbial biomass carbon was significantly correlated with organic carbon in Pinus sylvestris var.mongolica soil, but there was no significant correlation in Pinus sylvestris var. mongolica and peanut compound forest land. This indicated that there were differences in the effects of different forest management measures on soil organic carbon and microorganism. In conclusion, the compound measures of Pinus sylvestris var. mongolica and millet in western Liaoning are beneficial to improve soil structure, promote the formation of large aggregates, improve soil water retention, supply fertilizer, and realize the protection and sustainable use of soil.
【作者单位】：沈阳农业大学林学院;辽宁辽河平原森林生态系统定位研究站;
【基金】：林业公益行业科研专项(2014043005) 辽宁省科学技术计划项目(20141063)资助
【分类号】：S714

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