摘要
在柑桔根际土壤微生物的种群结构中,细菌占优势,最高达76871×10~7个每克干土;真菌次之,达17549个每克干土;放线菌最少,达12462个每克干土。三种菌的根际效应非常显著,根际细菌最高约为对照的67.6倍,真菌约为12.4倍,放线菌约为26.9倍,柑桔中,温州密柑根际土壤细菌最多,年平均为6490×10~7个每克干土;红桔的放线菌及真菌最多,年均分别为1326个每克干土及1728个每克干土。柑桔根际土壤微生物区系的种群结构和数量变动,受土壤理化性质的影响。并随树种、树龄、砧木及季节而变化。柑桔根部及根颈部对脚腐病、根腐病及线虫病的感病性和耐病性同柑桔根际土壤微生物区系中,有益微生物与有害微生物的种类、数量及分布有密切的关系。柑桔根际土壤有益微生物有促进生长发育和保护的作用。
The primary composition of citrus rhizosphere microorganisms is bacteria, whose number reaches up to 76871 × 107 per gram dry soil, next is fungi with 17549 numbers per gram dry soil, the least is actinomyces, the number is 12462 per gram dry soil. Those quantity are 67. 6, 12. 4 and 26. 9 times higher than those in no-root soils in the citrus field, respectively. The rhizosphere effect is very remarkable. Rhizosphere bacteria tends to be more abundant in Citrus ushiu mare soil, and fungi and actinomyces are comparatively abundant for C. reticulate blanto soil. Quantity of those rhizosphere microorganisms are influenced by soil physical and chemical characters and changing with citrus variety stock as well as season. There are also close relation between disease enduring and susceptibility of citrus root and root stem to some diseases with the quantity, type and distribution of beneficial and harmful rhizosphere microorganisms.
出处
《生态农业研究》
CSCD
1995年第1期39-47,共9页
Chinese Journal of Eco-agriculture
关键词
根际
土壤微生物
效应
种群动态
柑桔类果树
Citrus
Rhizosphere microorganisms
Rhizosphere effect
Population dynamics
