摘要
本文根据大量的野外观测资料,分析了农田林网生态系统凋落物的归还和分解过程。结果表明,该毛白杨林网系统年凋落物量达0.5545t/ha,其归还率为35.72％。在土壤内枯叶的失重率随着放置时间的增加而增加,180天时为30.46％,360天时为54.71％,540天时为75.16％,其年平均腐解率为0.86。在枯叶的分解过程中,营养元素丧失的排序为N>P>K>Mg>Mn>Ca。
On the basis of the data obtained from a lot of field experiments, the litter and its decomposition in a farmland shcl-tcrbclt network ecosystem with Popahis tomendost Carr. were studied. Tt is estimated that the annual Utter of the system was 0. 55t/ha with return rate of 35. 7%. The weight loss rates of litter in the farmland in 180, 360 and 540 days were 30. 5% ,54. 7% and 75. 2%, respectively, and its annual decomposition rate was 0. 86. Moreover, the decomposing rate of selected nutrient elements was in the order of N>P>K>Mg>Mn>Ca.
出处
《农村生态环境》
CSCD
1992年第2期37-39,共3页
Rural Eco-Environment
