摘要： 利用尼龙网袋,研究了油菜、毛叶苕子、冬牧70黑麦翻压于棉花田间15～20 cm土层,腐解及养分释放规律。研究表明,绿肥翻压43 d内干物重显著降低,前3 d腐解速度最快,后降低趋势变缓。翻压43 d时油菜、毛叶苕子、冬牧70黑麦腐解率达到81.7%,77.5%,62.2%;翻压113 d时腐解率分别达到89.6%,89.5%,76.2%。翻压21d内氮释放较快,3个品种氮矿化率都达到60%以上。磷在整个翻压期内释放较为平缓,翻压113 d时油菜、毛叶苕子、冬牧70黑麦磷矿化率分别达到89.6%,86.5%,75.6%。钾在翻压前期迅速释放,翻压9 d后,油菜、毛叶苕子、冬牧70黑麦钾的矿化率分别为94.5%,93.2%,91.9%。翻压前21 d,绿肥碳含量显著降低,以后逐渐缓慢,翻压113 d后油菜、毛叶苕子、冬牧70黑麦碳矿化率为93.4%,91.3%,81.9%。在翻压前15 d,冬牧70黑麦C/N呈上升趋势,其他两品种C/N变化不显著。

关键词: 冬牧70黑麦, 冬油菜, 毛叶苕子, 腐解规律, 养分释放特征

Abstract: This experiment studied on the decay process and nutrition release regulars of green manure ploughed in cotton field(15-20 cm soil layer) and green manure were installed in nilong dilly bag． Green manure included winter 70 rye，winter rape，and hairy vetch． The results showed that: dry matter weight of green manure decreased significantly dring 0-43 days incubation，decomposing speed were most fast in the first three days， then more and more slowly． After 43 days incubation，decomposition rate of winter rape，hairy vetch and winter 70 rye at 81． 7%， 77． 5%， 62． 2%，and after 113 days incubation at 89． 6%， 89． 5%， 76． 2%， respectively． Nitrogen released fast in the first 21days，after 21 days incubation，N-mineralization rates of three green manure were all greater than 60%． Phosphorous released gently during the whole ploughing days，after 113 days incubation，P-mineralization rates of winter rape，hairy vetch and winter 70 rye at 89． 6%， 86． 5%， 75． 6%， respectively． Potassium released fast in the first 9 days，K-mineralization rates were more than 90% after 9 days incubation． Carbon released fast in the first 21days，after 113 days incubation，C-mineralization rates of winter rape，hairy vetch and winter 70 rye at 93． 4%， 91． 3%， 81． 9%， respectively． C /N ratio of winter 70 rye showed increasing tendency in the first 15days， from 22 to 36，while the other two breed had no significant change．

Key words: Winter 70 rye, Winter rape, Hairy vetch + ryegrass, Decomposition regular, Nutrient release characteristics

中图分类号: 

• S142