摘要
对农林业系统沙兰杨－小麦－玉米群落类型中Ｎ、Ｐ、Ｋ流动网络分析表明，系统中Ｎ、Ｐ、Ｋ的循环指数分别为０．０７１、０．０３９、０．１３９，均小于传统的循环系数（ＣＣ等于回归量／吸收量），而在群落中的总滞留时间分别为２２．４１、７９．７２、２６．５７ａ．
A network analysis of N,P and K flows in Populus/Euramericana-Triticum sativum-Zea mays agroforestry ecosystem shows that the cycling index(CI)of N, P and K in the ecosystem is respectively 0.071,0.039 and 0.139,which is smaller than their cycling coefficiency(CC),being 0.078,0.055 and 0.15,respectively.The total retention time of N,P and K in the ecosystem is 22.41,79.72 and 26.57 years,respectively.
出处
《应用生态学报》
CAS
CSCD
1996年第1期19-22,共4页
Chinese Journal of Applied Ecology
基金
国家自然科学基金
关键词
农林生态系
生态网络
营养元素
氮
磷
钾
Agroforestry ecosystem
Econetwork
Retention time
Cycling index.
