固氮菌与溶磷菌接种对红海榄生长的影响

Inoculation of nitrogen-fixing bacteria and phosphate-solubilizing bacteria on the growth of Rhizophora stylosa

采用室内盆栽试验,研究固氮菌(Phy)、溶磷菌(Vib)单接种及双接种对红树植物红海榄植株生长和氮、磷营养的影响。接种后6个月对试验苗的生长指标等测定及分析表明,Phy、Vib单接种或Phy+Vib双接种均能改善红海榄氮、磷素营养,增强其光合作用,进而明显促进植株的生长和生物量的增加;其中Phy+Vib双接种的促生效果最显著,其苗高、茎径、地下生物量、总生物量、根全氮含量、根全磷含量和叶片叶绿素总量分别比未接种的对照苗提高43.3%,11.6%,44.8%,29.9%,29.3%,27.0%和16.8%。固氮菌(Phy)、溶磷菌(Vib)双接种在促进红海榄植株生长方面表现出一定的正交互效应,可用于苗期接种。

The pot experiment was conducted to study the inoculation effects of nitrogen-fixing bacteria （Phy）, or/and phosphate-solubilizing bacteria （Vib） on the growth and nutrients uptake of Rhizophora stylosa seedlings. The growth indexes of seedlings were assessed 6 months after inoculation. Statistic analysis revealed that either Phy or Vib inoculation could improve the nutritional status, enhance photosynthesis, and stimulate the growth of seedlings （with the increase of height, ground diameter, and biomass）. Dual inoculation of Phy and Vib yielded the highest plant dry weight and nutrient uptake compared to the single inoculation. Dual inoculation of Phy and Vib increased plant dry height, diameter, underground biomass, total biomass, total nitrogen of roots, total phosphorus of roots and total chlorophyll content of leaves by 43.3 %, 11.6 %, 44.8 %, 29.9%, 29.3 %, 27.0%and 16.8% compared to the uninoculated plant, respectively. Dual inoculation shows some positive interaction on the growth ofR. stylosa seedlings, and has great potential for inoculation at seedling stage.