大豆施硫的生理生态效应

Physiological and ecological effects of sulfur fertilization on soybean.

通过盆栽试验，研究3个水平硫元素（0.30，60mg·kg^-1）对大豆的生理生态效应．结果表明，施硫处理侧根数和根系干物重分别比对照增加了8．6％-33．2％和6．6％-34．3％，根瘤数量和干重分别增加了2．7％～35．9％和13．0％-75．7％，叶绿素含量增加了0．4—3．9个单位，单株产量提高了7．3％～12．8％．施硫还显著提高了土壤微生物（细菌、真菌、放线菌）数量及土壤过氧化氢酶、脲酶、中性磷酸酶和多酚氧化酶活性．表明施硫可明显提高大豆各项生理生态指标，促进大豆植株生长，提高大豆产量，其作用效果因施硫水平不同而异，综合各因素，以30mg·kg^-1施硫水平作用效果较好．

A pot experiment with 3 levels of elemental sulfur （ 0, 30, and 60 mg S · kg^-1 ） showed that sulfur fertilization on soybean increased the side roots number by 8.6% - 33.2% , root dry weight by 6. 6% - 34. 3% , root nodules number by 2.7% -35.9% and dry weight by 13.0% -75.7%, chlorophyll content by 0.4 - 3.9 unit, and yield per plant by 7.3% - 12.8%. Sulfur fertilization also increased the amount of soil bacteria, fungi and actinomycetes and the activities of peroxidase, urease, neutral phosphatase and polypbenoloxidase significantly. The effects of sulfur supply differed with its application rate, and 30 mg S· kg^-1 was more appropriate for getting high soybean yield.