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采用根际袋培养技术研究了大豆、玉米、油菜和水稻幼苗（６０ｄ）根际ＭＢ－Ｓ（ＭｉｃｒｏｂｉａｌＢｉｏｍａｓｓ－Ｓｕｌｆｕｒ）的根际效应及硫肥对根际ＭＢ－Ｓ的影响。结果表明：不施Ｓ，根际土壤ＭＢ－Ｓ在２１．６～２３．９ｍｇＳｋｇ－１（土）；油菜和水稻施Ｓ处理根际土壤ＭＢ－Ｓ为２２～２５ｍｇＳｋｇ－１（土）。作物根际土壤中ＭＢ－Ｓ含量比无作物处理提高了６５％～１３０％。非根际土壤ＭＢ－Ｓ在１２．５～１５．４ｍｇＳｋｇ－１（土），比无作物处理高７％～３３％。根际土壤ＭＢ－Ｓ是非根际土壤的１．７～２倍。水稻根际ＭＢ－Ｓ含量一般比旱作物高。与对照（无作物处理）相比根际ＭＢ－Ｓ增加百分数，水稻稍大于油菜，但明显低于大豆和玉米。硫肥施用对根际土壤ＭＢ－Ｓ的影响不大。作物根际土壤ＭＢ－Ｓ含量与其无机Ｓ呈直线正相关；与其有机硫呈直线负相关。在旱作物中根际土壤ＭＢ－Ｓ与土壤有机碳呈负相关，但在水稻中则相反。作物体含硫量与根际土壤ＭＢ－Ｓ含量呈负相关
The effects of sulfur fertilizer on the rhizosphere MB-S of rhizosphere MB-S (rhizosphere) of soybean, maize, rapeseed and rice seedlings (60d) were studied by rhizosphere culture. The results showed that MB-S in the rhizospheric soil was 21.6-23.9 mgSkg-1 (soil) without applying S, MB-S was 22-25 mgSkg-1 (soil) in the rhizosphere soil of rape and rice. The content of MB-S in crop rhizosphere soil increased by 65% ~ 130% compared with no crop treatment. MB-S in non-rhizosphere soil was 12.5 ~ 15.4mgSkg-1 (soil), which was 7% -33% higher than that of non-rhizosphere soil. The MB-S in rhizosphere soil was 1.7-2 times of non-rhizosphere soil. The content of MB-S in rice rhizosphere is generally higher than that of dry crops. Compared with the control (no crop treatment), the percentage of rhizosphere MB-S was increased, while that of rice was slightly larger than that of rapeseed but significantly lower than that of soybean and maize. Sulfur fertilizer application had little effect on rhizosphere soil MB-S. The content of MB-S in crop rhizosphere soil had a linear positive correlation with inorganic S, but negatively correlated with organic sulfur. MB-S in rhizosphere soil was negatively correlated with soil organic carbon in dry crops, but opposite in rice. The sulfur content of the crop was negatively correlated with MB-S content in rhizosphere soil