人工油松林土壤线虫密度垂直分布及其影响因素

发布时间：2018-02-28 03:05

本文关键词： 凋落物土壤线虫微生物生物量有机碳　出处：《西北林学院学报》2017年01期 　论文类型：期刊论文

【摘要】：土壤线虫对有机质的分解及养分循环起重要作用。为了解油松人工林土壤线虫数量的垂直分布规律,以北京八达岭林场2种不同密度的油松人工林(林分1的密度为820株·hm~(-2);林分2的密度为1 620株·hm~(-2))土壤为研究对象,对新鲜凋落物层(L)、半分解凋落物层(F)以及0~2、2~5、5~10、10~20、20~50cm和50~80cm矿质土壤层的土壤pH、土壤有机碳、水溶性有机碳、土壤微生物生物量碳和氮以及土壤线虫的数量进行分析。结果表明,林分1和林分2凋落物L层的线虫数量分别为12 010、12 410条·100g~(-1)干土,均显著低于凋落物的F层。2个林分凋落物层的线虫数量与矿质土壤层的线虫数量相比,存在显著差异。在林分1和林分2的矿质土壤层,0~2cm土壤线虫的数量分别为3 593条·100g~(-1)干土和4 968条·100g~(-1)干土,二者分别高出2~5cm土层土壤线虫数量的118%和120%。从5~10cm土层以下,不同土壤线虫的数量变化无显著差异。相关分析表明,土壤线虫的数量与土壤pH呈显著负相关,而与土壤水溶性有机碳、土壤有机碳、土壤微生物生物量碳和氮呈显著正相关。总的来看,土壤线虫的垂直分布与土壤有机质以及土壤微生物生物量碳氮的垂直递减规律一致。
[Abstract]:Soil nematodes play an important role in the decomposition of organic matter and nutrient cycling. In order to understand the vertical distribution of soil nematodes in Pinus tabulaeformis plantation, Two different densities of Pinus tabulaeformis plantation in Badaling Forest Farm, Beijing, were studied. The soil density of Pinus tabulaeformis plantation (stand 1 was 820 plants 路hmmf-2; stand 2 was 1 620 plants 路hmmc-2), and the soil of Pinus tabulaeformis plantations with different densities (stand 1 was 820; stand 2 was 1 620). The soil pH, soil organic carbon, water soluble organic carbon, microbial biomass carbon and nitrogen of soil microbial biomass and the quantity of soil nematodes were analyzed in fresh litter layer (Ln), semi-decomposable litter layer (F), and mineral soil layer of 0 ~ 2, 2, 5, 5, 10, 10, 10, 10, 10, 10, 20, 20, 20, 20, 20, and 50 ~ 80cm, respectively, the results showed that: (1) soil organic carbon, soil organic carbon, soil microbial biomass carbon and nitrogen, and soil nematodes. The number of nematodes in litterfall L layer of stand 1 and stand 2 was 12 010 10 ~ 12 410 路100 g / 1) dry soil, which was significantly lower than that in F layer of litter, and the number of nematodes in two litter layers was higher than that in mineral soil layer. There was significant difference between them. The number of nematodes in the soil of the mineral soil layer of stand 1 and stand 2 were 3 593 路100g / 1) dry soil and 4 968 / 100g ~ (-1) dry soil respectively, which were higher than 118% and 120% of the soil nematode number of 2 ~ 5 cm soil layer, respectively. The soil nematode numbers were below 5 ~ 10 cm soil layer, respectively, and the number of nematode insects in the soil layer of 2 ~ 5 cm soil layer was 118% and 120 ~ (-1) higher than that in the soil layer of 2 ~ 5 cm soil layer. The correlation analysis showed that the number of soil nematodes was negatively correlated with soil pH, but with soil water-soluble organic carbon, soil organic carbon, soil organic carbon, soil water soluble organic carbon, soil organic carbon, soil water soluble organic carbon, soil organic carbon, soil water soluble organic carbon, soil organic carbon. In general, the vertical distribution of soil nematodes is consistent with the vertical decline of soil organic matter and soil microbial biomass carbon and nitrogen.
【作者单位】：北京林业大学林学院;北京市八达岭林场;北京林业大学生命科学与技术学院;
【基金】：北京市财政项目(PXM2016-154309-000006) 北京林业大学大学生创新创业训练计划项目(S201510022007)
【分类号】：S714.3

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