不同根瘤菌接种厚荚相思幼苗的试验效果

为了探讨接种不同根瘤菌对厚荚相思AcaciacrassicarpⅡ苗木生长以及对土壤肥力和土壤酶活性的影响．以3个根瘤菌菌株接种厚荚相思幼苗进行研究。结果表明：接种根瘤菌能极显著提高厚荚相思苗木的苗高、地径、叶片含氮量、土壤全氮量、土壤有机质及土壤磷酸酶和果聚糖蔗糖酶活性，其中苗高生长量增加15．1％～27．4％．地径生长量增加7．7％－32．0％，叶片含氮量提高54．7％～84．6％，土壤全氮量提高21．4％～31．6％，土壤有机质提高31．0％～38．7％，土壤磷酸酶活性提高23．4％～34．7％，果聚糖蔗糖酶活性提高64．5％－178．0％；苗木的生物量也有显著增加，苗木单株总生物量增加22．6％～73．1％。综合分析表明，接种根瘤茵具有良好的生态效益。表4参20

Inoculation of Acacia crassicarpa seedlings with three rhizobia bacteria

To determine the effect of different rhizobia on growth as well as their influence on soil fertility and soil enzyme activity, three rhizobia（HM4, HO6, HM8） were used to inoculate tissue culture seedlings of Acacia crassicarpa. We use randomized block design with single factor（no inoculation as a control）, with three replications. After five months of growth, we measured height, base diameter, biomass, N contents in leaf or soil, soil organic maters, and phosphatase and levansuerase activity in soil. Compared to a control, results showed increases in seedling height 15.1% - 27.4%（P〈0.05）, seedling base diameter 7.7% - 32.0%（P〈0.05）, N content of the leaf 54.7% - 84.6%（P〈0.01）, soil N 21.4% - 31.6%（P〈0.01）, soil organic content 31.0%-38.7% （P〈0.01）, soil phosphatase enzyme 23.4% - 34.7% （P〈0.05）, and levansucrase activity in the soil 64.5% - 178.0%（P〈0.05）. This study indicated that there were good ecological benefits after inoculation with the rhizobia. Ch, 4 tab. 20 ref. ]