关键词: 油菜, 油菜, 喷施氯化钾, 硝酸盐, 氮素分配

Abstract:

In the process of rapid urbanization, it is quite necessary to protect a number of ecological land to maintain the ecosystem health, improve living quality and guarantee sustainable development of the region. The author put forward the concept and calculation method of effective ecological land based on the theory of ecosystem services. The results showed that: the effective ecological land around the Taihu Lake was 826127.85 hm2 in 2005, which counted for 29.97% of the total area. From the perspective of ecological land types, the proportion of water area has increased from 21.82% to 51.14%; the proportion of cultivated land had dropped from 62.16% to 25.38%. Between different cities, the difference was obvious. The proportion of the effective ecological land in Suzhou was highest among the 5 cities, reaching 40.77% in 2005. The proportion of the effective ecological land in Jiaxing was lowest, only 16.77%. The proportion of the effective ecological land can be a effective planning index to indicate the level of ecological construction.