【摘要】 对羊草群落凋落物分解季节动态与微生物呼吸速率、土壤有机质、土壤C/N、土壤温度、土壤水分等11种环境因素的季节动态进行了系统的研究,结果表明:1)凋落物分解季节动态呈单峰曲线,8月中旬达最大值4.285mg/(g·d)。2)凋落物分解指数为1.55,95%凋落物分解需6.8年。3)微生物呼吸速率季节动态呈单峰曲线,8月中旬达最大值13.27Cg/(cm2·d),同凋落物分解速率显著正相关。4)凋落物分解速率同土壤有机质含量、土壤C/N显著负相关。5)凋落物分解速率同土壤水分显著正相关。更多还原

【Abstract】 This paper discussed the seasonal dynamics of eleven environmental factors, including microorganism respiration rate, soil organic matter content,ratio of carbon to nitrogen of soil, soil temperature, soil water content and decomposition rate of litter in Leymus chinensis community.The results showed as followed: (1) The seasonal dynamics of decomposition rate of litter showed a singlepeak curve with the maximum 4.285 mg/(g.d) in the middle of August. (2) The decomposition index of litter was 1.5 and 6.8 years would be needed to decompose 95% of the litter accumulated in the ground. (3) The seasonal dynamics of microorganism respiration showed a singlepeak curve with the maximum 13.27 C g/(m2.d) in the middle of August,Which synchronized with the seasonal dynamics of decomposition rate of litter.(4) The seasonal dynamics of decomposition rate of litter was negatively correlated with soil organic matter content and the ratio of carbon to nitrogen of soil. (5) The seasonal dynamics of decomposition rate of litter was positively correlated with soil water content. 更多还原