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采用室内恒温好气培养法,研究了土壤中添加不同有机物料氮的矿化进程和矿化残留率。结果表明:添加蘑菇渣处理显著降低了土壤的净矿化氮含量(P<0.01);而添加鸡粪和2%、4%牛粪显著提高了土壤的净矿化氮含量(P<0.01)。有机物料矿化过程中土壤净矿化氮含量呈现先下降再升高再下降的趋势,牛粪和鸡粪处理在90d出现最大值,而蘑菇渣在120d出现最大值。添加牛粪、鸡粪显著提高了土壤的硝态氮含量,蘑菇渣则显著降低了土壤硝态氮含量(P<0.01);土壤硝态氮含量呈现先上升后下降的趋势,在培养的第90d达到峰值。添加蘑菇渣、鸡粪和牛粪显著提高了土壤铵态氮含量(P<0.01),土壤铵态氮含量呈现先下降再升高再下降的趋势,添加鸡粪处理峰值出现在培养的第90d,而蘑菇渣和牛粪处理峰值出现在120d。蘑菇渣、牛粪和鸡粪三种有机物料氮的矿化先经历快速分解的阶段,之后进入缓慢分解阶段,鸡粪分解最快,蘑菇渣分解最慢,氮的矿化残留率随有机物料添加量的增大而增大,蘑菇渣、牛粪、鸡粪在210d后的分解残留率与添加量呈显著正相关(r蘑菇渣=0.938**,r牛粪=0.942**,r鸡粪=0.995**,n=12)
Using indoor thermostatic gas culture method, the mineralization process and mineralization residual rate of nitrogen in different soil organic matter were studied. The results showed that the addition of mushroom residue significantly reduced the net mineralized nitrogen content of soil (P <0.01), while the addition of chicken manure and 2% and 4% of cow dung significantly increased the content of net mineralized nitrogen (P <0.01) . During the mineralization process, the content of net mineralized nitrogen in soil decreased firstly, then increased and then decreased. The dung and chicken manure showed the maximum value at 90 d, while the mushroom dunnage reached the maximum at 120 d. The addition of cow dung and chicken manure significantly increased the content of nitrate nitrogen in soil, and the mushroom residue significantly reduced the content of nitrate nitrogen in soil (P <0.01). The content of nitrate nitrogen in soil first increased and then decreased, 90d peaked. The addition of mushroom residue, chicken manure and cow dung significantly increased the content of ammonium nitrogen in soil (P <0.01), and the content of ammonium nitrogen in soil decreased first, then increased and then decreased again. The peak of chicken manure addition appeared on the 90th day, The mushroom residue and cow dung peak appeared in 120d. Mushroom residue, cow dung and chicken manure nitrogen mineralization experienced three stages of rapid decomposition, and then entered the slow decomposition stage, the fastest decomposition of chicken manure, mushroom residue decomposition slowest, the rate of residual mineralization of nitrogen with organic materials The amount of decomposition of mushroom residue, cow manure and chicken manure after 210 days had a significant positive correlation (r mushroom residue = 0.938 **, r cow manure = 0.942 **, r chicken Fecal = 0.995 **, n = 12)