摘要
基于喀斯特峰丛洼地农作区、人工林、次生林、原生林4类生态系统土壤微生物量、微生物数量及土壤养分的分析,本文探讨了不同生态系统土壤微生物特征及其与土壤养分的耦合关系.结果表明:不同生态系统微生物种群组成不同,真菌比率均较低,农作区、人工林、原生林的放线菌比率较大,而次生林细菌比率较大；不同生态系统中微生物量碳(Cmic)与微生物量氮(Nmic)、微生物量磷(Pmic)的相关性均达到了显著或极显著水平；不同生态系统土壤微生物量与土壤养分的关系密切,而微生物数量与土壤养分的相关性均较弱,表明土壤微生物细菌、真菌、放线菌种群数量分布的随机性较大,而不是受单一养分因子的控制；不同生态系统中土壤微生物属性和土壤养分的耦合关系不同:农作区土壤有机质(SOM)、pH、全磷(TP)起较大作用,主要影响土壤Cmic、细菌和真菌；人工林中土壤水分、SOM、全氮(TN)、TP主要影响土壤微生物量；次生林中以pH、SOM、TP、碱解氮(AN)、速效钾(AK)主要影响土壤微生物量和真菌；原生林主要有pH、TP、AN影响土壤微生物量和细菌.
Abstract
Based on the analysis of soil microbe and soil nutrients in different ecosystems of depression between karst hills, i.e., cropland, plantation forest, secondary forest, and primary forest, this study explored the characteristics of soil microbe and revealed the coupling relationships between soil microbe and nutrients. The composition of microbial population differed in the four ecosystems, where the ratio of fungi was lower in the four ecosystems. The ratio of actinomy-cetes in cropland, plantation and primary forest was larger than that of bacteria, while the reverse was true in the secondary forest. In the four ecosystems, the microbial biomass carbon (Cmic) was significantly correlated with the microbial biomass nitrogen (Nmic) and phosphorus (Pmic). The relationship between soil microbial factors and soil nutrients differed in the four ecosystems, among which the soil microbial biomass was closely with soil nutrients, while the amount of soil microbial population was weakly related with soil nutrient in the four ecosystems. This indicated that soil microbial populations such as bacteria, fungi and actinomycetes was randomly disturbed, instead of controlled by sole nutrient factor. The coupling relationships between soil microbe and soil nutrient factors were different in the four ecosystems. In the cropland, soil organic matter (SOM), pH, and total phosphorus (TP) played a greater role and mainly affected on Cmic, bacteria and fungi. In the plantation forest, soil water content, SOM, total nitrogen (TN), and TP had a greater effect on soil microbial biomass C, N, and P. In the secondary forest, pH, SOM, TP, available nitrogen (AN), and available potassium (AK) mainly influenced soil microbial biomass C, N, P, and fungi. In the primary forest, pH, TP, and AN proudly affected on soil microbial biomass C, N, P, and bacteria.
基金项目
中国科学院西部行动计划项目(KZCX2-XB3-10)
中国科学院战略性先导科技专项(XDA05050205)
中国科学院战略性先导科技专项(XDA05070404)
国家科技支撑计划(2011BAC09B02)
国家自然科学基金(31000224)
国家自然科学基金(31070425)
国家自然科学基金(30970508和U1033004)
中国科学院"西部之光"人才培养计划项目()
广西特聘专家项目资助()
国家科技期刊平台
NSTL
维普
万方数据