农林业系统中营养元素再循环指数的灵敏度分析  

Sensitivinty analysis of Recycling Indexes of Nitrogen,Phosphorus and Kalium in an Agroforestry Ecosystem of the Populus euramericana- Triticum aestivm-Zea mays Community

作　　者：吴刚[1] 韩博平[1] 

机构地区：[1]中国科学院生态环境研究中心,中山大学生物系

出　　处：《北京林业大学学报》1995年第2期16-20,共5页Journal of Beijing Forestry University

摘　　要：对农林业系统沙兰杨－小麦－玉米群落类型中营养元素氮、磷、钾循环过程和特征进行了分析；计算了氮、磷、钾营养元素在系统中的再循环指数及其灵敏度。结果是输出趋于减少营养物质再循环指数，植物地上部分营养物质的归还对于增加再循环指数是最为关键的。从整体上看，磷再循环指数的灵敏度比其它两个元素要大，说明磷的循环过程是最不稳定的。Sensitivities of ecycling indexes of nitrogen,phosphorus and kalium in the agro-forestry ecosystem of the Populus euramericana-Triticum aestivum-Zea mays community are ana-lyzed. The results show that the sensitivities of recycling index about outputs are negative,thedecreasment of cycling index by the nutrient lost in soil is more sensititive. The nutrient returning by pIants is the most important factor to increase the recycling index. In the whole agroe-cosystem,all sensitivities of phosphorus recycling index are greater than these of the other twonutrinets recycling indexesi.e,the cycling processes of phosphorus is the most sensitive to dis-turbance.

关 键 词：营养元素 再循环指数 生态网络 农林业系统 

分 类 号：Q945.12[生物学—植物学]