The Sensitivity Analysis of Recycling Indices of Nitrogen, Phosphorus and Potassium in an Agroforestry Ecosystem of the Populus euramericana-Triticum sativum-Zea mays

摘要

The sensitivities of recycling indices of nitrogen, phosphorus and potassium (N,P,K) in the agroforestry ecosystem of Populus euramericana-Triticum sativum-Zea mays were analyzed. The results showed that when the sensitivities of output recycling indices were negative, a decrease of cycling indices in soil was detected. The nutrient elements returned by plants were the most important factor in increasing the recycling indices. In the whole agroforestry ecosystem, all sensitivities of phosphorus recycling indices were larger than those of N and K.