上海市3种森林类型土壤微生物生物量碳和氮的时空格局

doi:10.11934/j.issn.1673-4831.2016.04.016

摘要/Abstract

摘要：

土壤微生物生物量作为土壤有机质最活跃的部分，可用来表征土壤肥力水平，而且在维持土壤生态系统平衡方面有重要意义。采用氯仿熏蒸浸提法测定上海市3种城市森林土壤微生物生物量碳含量（C_mic）和氮含量（N_mic），并分析了其空间变化和季节动态。结果表明，林型之间C_mic和N_mic差异显著，香樟（Cinnamomum camphora）林、水杉（Metasequoia glyptostroboides）林、香樟混交林C_mic和N_mic变化范围分别为46.57～908.77和10.61～103.64、64.58～480.54和20.14～88.39、57.38～853.18和16.67～148.00 mg·kg^-1，各林型C_mic和N_mic均随土壤深度的增加而下降。3种林型除>15～20 cm土层微生物生物量季节变化不显著以外，0～5、>5～10和>10～15 cm 3个土层都有明显季节动态，且最高值均出现在秋季。相关分析表明，土壤微生物生物量与土壤有机碳含量、全氮含量呈极显著正相关（P<0.01），与容重呈极显著负相关（P<0.01），同时N_mic受水分和温度的影响较大。不同城市森林中植被与环境因子的共同作用导致土壤有机碳含量和全氮含量的不同，造成土壤微生物生物量的时空格局差异。

关键词: 城市森林, 土壤微生物, 季节动态, 空间格局

Abstract:

Being the most active part of soil organic matter, microbial biomass can be used to characterize soil fertility, and plays an important role in maintaining balance of the soil ecosystem. The dafumigation-extraction method (FE) was used to determine soil microbial biomass carbon content (C_mic) and nitrogen content (N_mic) in three types of urban forest soils in Shanghai for analysis of their spatio-temporal and seasonal variations. Results show that the soils varied sharply in C_mic and N_mic with the type of forest. C_mic in the soil of the Cinnamomum camphora forest, Metasequoia glyptostroboides forest and C. camphora-dominated mixed forest varied in the range of 46.57-908.77, 64.58-480.54 and 57.38-853.18 mg·kg^-1, respectively, while N_mic in the range of 10.61-103.64, 20.14-88.39 and 16.67-148.00 mg·kg^-1, respectively. Both C_mic and N_mic declined with soil depth in all the soil profiles. However, soil microbial biomass did not vary much seasonally in the >15-20 cm soil layer, but quite significantly in the 0-5, >5-10 and >10-15 cm soil layers, in all the types of forest soil, and often peaked in autumn. Correlation analysis indicates that the content of soil microbial biomass was significantly and positively related to the content of soil organic carbon and total nitrogen(P<0.01), but negatively to soil bulk density(P<0.01). Moreover, N_mic was greatly influenced by soil water content and soil temperature. As a result of the joint effect of vegetation and environmental factors, the three types of forest soils differed in content of soil organic carbon and total nitrogen and hence the spatio-temporal distribution of soil microbial biomass.

Key words: urban forest, soil microbe, seasonal dynamics, spatial pattern

中图分类号:

X825

王娟娟, 朱莎, 靳士科, 张琪, 由文辉. 上海市3种森林类型土壤微生物生物量碳和氮的时空格局[J]. 生态与农村环境学报, 2016, 32(4): 615-621.

WANG Juan-juan, ZHU Sha, JIN Shi-ke, ZHANG Qi, YOU Wen-hui. Spatio-Temporal Distribution of Soil Microbial Biomass Carbon and Nitrogen in Three Types of Urban Forest Soils in Shanghai[J]. Journal of Ecology and Rural Environment, 2016, 32(4): 615-621.

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