摘要
通过室内培养实验 ,应用δ1 3C方法研究了玉米秸秆分解期间 ,土壤中胡敏酸 (HA)和富里酸 (FA)数量的动态变化。结果表明 :培养期间 ,新加入的玉米秸秆以及原土有机C都减少 ,但后者分解速度较慢。培养初期 ,FA的形成速度大于HA ;随培养时间延长 ,FA转化为HA或相互转化。原土有机质中 ,HA、FA也发生了相互转化 ,但与新形成的HA、FA相比转化速度较慢。用δ1 3 C方法研究短期培养 (几个月～几年 )条件下新加入有机质在土壤中的分解动力学是可行的。
In an incubation experiment, dynamic change in amounts of soil organic matter (SOM), HA and FA were studied during corn stalk (CS) decomposition in dark-brown soil by δ 13C method. The results showed that organic carbon from both new added CS and original soil decreased, but decomposition rate of the latter was slower than that of the former during incubation periods. The residual rate of CS was about 36% at 360th day and 24% at 720th day, whereas that of original SOM was above 90% at 360th day and about 76% at 720th day. In the initial stage of incubation (1hour), the formed rate of FA was faster than that of HA. Then, FA transformed into HA. After 15th day, HA transformed into FA again. HA and FA from original SOM also transformed each other, and it was still the same trend that FA transformed into HA before 15th day. But the transformed rate in original SOM was relatively slower than that in new-formed SOM. δ 13C method can be used to study decomposition dynamics of SOM in short-term incubation experiment (several months～several years).
出处
《土壤学报》
CAS
CSCD
北大核心
2003年第3期328-334,共7页
Acta Pedologica Sinica
基金
国家自然科学基金 (4 99710 52 )
吉林省杰出青年基金 (1999- 48- 17
96350 4 - 2 )
中国科学院南京土壤研究所土壤圈物质循环开放研究实验室资助项目
