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竹阔混交林土壤微生物生物量及酶活性特征研究
张美曼, 官凤英
国际竹藤中心 竹藤科学与技术重点实验室
摘要:
土壤微生物生物量及土壤酶活性是土壤中重要的活性指标,研究竹阔混交林土壤微生物生物量与酶活性随混交比(混交林中阔叶树冠幅所占比例)的变化特征,对竹阔混交林土壤状况进行评价,为竹阔混交林经营过程中阔叶树冠幅的修剪提供一定理论基础。本文通过对福建省永安市天宝岩自然保护区竹阔混交林的调查,研究混交比(阔叶树冠幅与样地面积比)为0 ~ 10%、10% ~ 20%、20% ~ 30%、30% ~ 40%、40% 以上的竹阔混交林林分土壤微生物生物量及酶活性的分布特征。结果显示:混交比与土层对土壤微生物生物量氮(SMBN)、酶活性均有显著性影响,混交比对土壤微生物生物量碳(SMBC)的影响不显著。不同混交比下,SMBC、SMBN、土壤酶活性均表现为随土层加深而降低;SMBC含量在30% ~ 40% 混交比最高(357.67 mg/kg),SMBN含量在混交比为20% ~ 30% 时最高(127.00 mg/kg);混交比为20% ~ 30% 的竹阔混交林林分土壤脲酶、蔗糖酶、过氧化氢酶活性较高,土壤脲酶、蔗糖酶、过氧化氢酶在混交比为10% ~ 20% 时含量显著低于其他4种混交比;相关性分析表明,土壤脲酶、蔗糖酶、过氧化氢酶与土壤微生物生物量之间均呈正相关,其中土壤过氧化氢酶、脲酶分别与SMBC、SMBN呈显著正相关,土壤蔗糖酶和过氧化氢酶均与SMBN呈极显著相关性;SMBC与pH、全氮呈显著正相关,SMBN与土壤含水率、全氮呈极显著正相关;土壤脲酶、蔗糖酶、过氧化氢酶与土壤有机碳、全氮之间均呈极显著正相关。研究表明:林分中阔叶树混交比、土壤深度等都能对SMBC、SMBN、土壤酶活性产生影响,可见竹阔混交林中混交比对土壤状况有一定的影响,其中综合分析得出混交比20% ~ 30% 的林分其土壤微生物生物量与酶活性状况达到最佳。
关键词:  竹阔混交林  混交比  土壤微生物生物量  酶活性
DOI:10.13758/j.cnki.tr.2020.01.014
分类号:S714.3;S714.8
基金项目:竹藤中心科研业务费专项(1632019005、1632018003)和林业科技创新平台运行补助项目(2019132146)资助。
Study on Soil Microbial Biomass and Enzyme Activities in Mixed Forest of Bamboo and Broad-leaved Trees
ZHANG Mei-man, GUAN Feng-ying
International centre for bamboo and rattan
Abstract:
In this study, the characteristics of soil microbial biomass and enzyme activities of bamboo and broad-leaved forests with different mixed ratios (0-10%, 10%-20%, 20%-30%, 30%-40%, and above 40%) were investigated in order to evaluate the effect of mixed ratio on soil conditions. Three sample plots (20 m ? 20 m in size) were set for each ratio, and soils of 8 sampling points were randomly collected in S-shape within each plot in December 2017. The results showed that the mixed ratio and soil depth significantly influenced soil microbial biomass nitrogen (SMBN) and enzyme activities, but influenced insignificantly soil microbial biomass carbon (SMBC). SMBC, SMBN and enzyme activities decreased with the increase of soil depth. SMBC was the highest (357.67 mg/kg) in the mixed ratio of 30%-40%, SMBN was the highest (127.00 mg/kg) in the mixed ratio of 20%-30%. The activities of soil urease, sucrase and catalase were higher in the mixed ratio of 20%–30%, while were the lowest in the mixing ratio of 10%-20%. Correlation analysis indicated that the activities of soil urease, sucrase and catalase were positively correlated with SMB, among of which, the activities of soil catalase and urease had significant positive correlation between SMBC and SMBN, while the activities of soil sucrase and catalase were significantly correlated with SMBN. SMBC was significantly positively correlated with pH and total nitrogen. There was a very significant positive correlation between SMBN and soil water content and total nitrogen. The activities of soil urease, sucrase and catalase were positively correlated with soil organic carbon, total nitrogen. In conclusion, the mixed ratio, soil depth could impact on SMBC, SMBN and enzyme activities significantly, the mix ratio has a certain impact on soil conditions, and the mixed ratio of 20%-30% has the best soil microbial status.
Key words:  Bamboo and broad-leaved mixed forest  Mixed ratio  Microbial biomass  Enzyme activity

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