三江平原小叶章枯落物分解动态及其分解残留物中磷素季节动态

Study on Dynamics of Litter Decomposition and Seasonal Dynamics of Phosphorus in Decomposed Residue of Deyeuxia angustifolia in Sanjiang Plain.

对三江平原典型小叶章植被 5～ 10月生长季内枯落物分解速率、分解残留物中磷素的浓度和重量的季节动态以及相应土壤中的磷素季节动态进行了系统的分析研究。结果表明 ,小叶章枯落物分解失重率为 2 9.80 % ,最大日失重率为 0 .2 5% ;小叶章枯落物分解残留物中磷素浓度与重量的季节变化随分解的进行均呈减少趋势 ,当分解到 157d后两者减少的量分别为 57.69mg/kg和 1.6199mg ,分别占原有量的 72 .84 %和 76.30 % ;

The rate of decomposition of Deyeuxia angustifolia litter, the P content and weight in decomposed residue of litter, and P content in the corresponding soil from May to October in Sanjiang Plain were studied. At the same time, the simulation models were listed in the paper. The results showed that the rate of weight lost of decomposition of Deyeuxia angustifolia litter is 29.80% and the maximum of daily rate of weight lost is 0.25%. The P content and weight in the decomposed residue of litter decrease with the decomposing process, the decresement amount of the both were respectively 57.69mg/kg and 1.6199mg after decomposing for 157d, which were 72.80% and 76.30% of its previous amount. In addition, there is a polynomial minus correlationship of P content between the variation in corresponding soil and the decomposed residue of litter at the corresponding period.