<正>通过调节通风量控制溶解氧浓度研究其对里氏木霉产纤维素酶的促进作用。结果表明：当通风量固定为25L/（h?L）时，反应22～40h期间溶解氧浓度过低，0～15h和45h以后溶解氧浓度偏高，45～80h期间气体中CO2含量在0.8%以上，不利于菌丝的生长。调节通风量控制溶解氧浓度，可有效地提高里氏木霉合成纤维素酶的能力，并显著地缩短产酶时间。当溶解氧为20%～30%时，气体中c0，含量降到0.4%左右，菌丝生长代谢快，滤纸酶活从固定通风量时的2.75u/mL增加到3.54u/mL，提高28.7%，产酶酶活最高的时间也从84h缩短到72h。

The toxicities of carbonyl sulfide (COS) for some pests of vegetables and horticulture at different dosage and exposure time were investigated. The results showed that COS had effect on killing 13 tested species of vegetable and horticultural pests, and but no effect on two species of nematodes. The mortality of insects increased with the increase of the dosage and exposure time of COS. At the condition of (20±1)°C or 25°C, COS with the dosage of 40g/m3 for an exposure time of 2h can completely kill these pests, but there were no effect on the nematodes in soil. The results of COS effects on fruits, vegetables, cut flowers, lily bulbs and potted ornamental plants showed that there were no phytotoxic effects of COS on fruits and vegetables under the condition of COS with the dosage of 40g/m3 and for an exposure time of 2h. The COS fumigation has no damage to flowers, but there were serious damages to leaves, especially to plant of Orchidaceae and Bromeliaceae. The fumigation causes symptoms of dried-up, necrosis on the leaves or loss the value of ornamental.