桉树人工林土壤环境对植物种子发芽和生长的影响

In soil environment of eucalyptus plantation, the differences of stylosanthes's seed germination was significant when the density of Eucalyptus leaves soaking solution was 50%（patching 1 kg fresh Eucalyptus's leaves, soaking with 1 000 mL water 24 h）; But when the solution density were form 1%～40%, the differences were not significant; Seed germination and seedling growth were not negative affected by different weights of Eucalyptus's or Eupatorium odoratum's leaves which patched by knife and covered with earth, while seedling growth of Stylosanthes guianensis was improved. Besides, seed germination could be improved after scarifying, and seed germination percentage after scarifying was higher 64% than no scarifying. In wild conditions, seed germination was also affected obviously by watering quantity, seed germination occurred when watering quantity was higher than 500 mL·m~ -2 d~ -1 , and the highest seed germination percentage of 100% occurred when watering quantity was 2 000 mL·m~ -2 d~ -1 ; On the contrary, no seed germination occurred in controls and when watering quantity was lower than 500 mL·m~ -2 d~ -1 . In room conditions, the differences of seed germination percentage with different watering quantity were significant, while differences of seed germination percentage in different eucalyptus plantation soils were not significant.