摘要
为了明晰凋落物中微生物数量对间伐强度的响应程度,以南京溧水林场间伐7 a后25年生的杉木(Cunninghamia lanceolata(Lamb.)Hook.)人工林为对象,研究了不同间伐强度对凋落物中真菌、细菌、放线菌3类微生物数量季节性变化的影响。结果表明:不同强度间伐杉木人工林下凋落物中微生物的数量随季节变化差异显著,微生物数量在春季期间对间伐响应最为显著。与对照相比,春季内弱度间伐下细菌数量显著减少了61.05%(P<0.01);而春季内中度间伐下的真菌和细菌数量分别减少了25.32%(P<0.01)和36.14%(P<0.01),放线菌则增加了30.97%(P<0.05);春季内强度间伐下真菌量和放线菌数量分别增加了77.64%(P<0.05)和59.35%(P<0.01),细菌数量减少了42.11%(P<0.01)。其中,凋落物层温度及林下植被层Margalef指数对微生物数量的影响最为显著。微生物数量的影响会导致凋落物向土壤中输送的养分不同,对提高林分生产力有重要意义。
In order to clarify the response of the microbial number to thinning intensities in the litter layer, the microorganisms＇ number of fungi, bacteria and actinomycetes in litter was determined during season changes in different thinning intensities in a 25-year old Chinese fir （ Cunninghamia lanceolata （ Lamb. ） Hook. ） plantation. The numbers of microorganisms in the litter were significantly different depending on the season in the different thinning intensity, especially in spring. Compared with the control, the number of bacteria in spring significantly was reduced by 61.05% （P〈0.01） in the light intensity thinning. The number of fungi in litter was reduced by 25.32% （P〈0.O1） in middle intensity thinning in spring, and the number of bacteria was reduced by 36.14% （P〈0.01）, while the number of actinomycetes was increased by 30.97% （P〈 0.05）. In high intensity thinning, the numbers of fungi and actinomycetes were increased by 77.64% （P〈0.05） and 59.35% （P〈0.01） , respectively. The number of bacteria in spring decreased by 42.11% （P〈0.01） in high intensity thinning. A- mong all the factors, the impact of litter layer temperature and the Margalef index of the forest floor on the numbers of mi- croorganisms is the most significant. The differences of the numbers of microorganisms in litter will lead to different nutri- ents that delivered to the soil, and improve the forest productivity.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2016年第1期31-36,共6页
Journal of Northeast Forestry University
基金
国家林业公益性行业科研专项(201104075)
江苏高校协同创新计划资助项目
江苏高校优势学科建设工程资助项目(PAPD)
关键词
间伐强度
凋落物
真菌
细菌
放线菌
季节变化
Thinning intensity
Litter
Fungi
Bacteria
Actinomyces
Seasonal changes
