福建稻田生态系统分析

An Analysis on Paddy Field Ecosystems in Fujian Province.

福建地处我国东南沿海,北纬23°26′—28°22′,东经116°—120°,依山面海。土地面积1.207×10~5km^2(折1.207×10~7ha),人口2800.82万,人均0.43ha。境内山峦起伏,海拔高0—2158m,地形复杂。耕地1.2439×10~6ha,占土地面积的10.1%,人均耕地0.045ha,为山多人多耕地少的省份。稻田9.56×10~5ha,其中75.4%分布于山区,多为中低产田,平均年产6165kg·ha^(-1);24.6%分布在沿海冲积平原,平均年产10042.5kg·ha^(-1)。现将稻田生态系统综合分析如下,为提高稻作产量,解决福建粮食问题提供参考。

Fujian is a mountainous province with less fa(?)mland and abundant labor in southeast coastal regions of China. Resources of temperature, solai radiation and rainfall in paddy field ecosystems are different with the change of latitude and altitude. Analysis results show that there are four kinds of discontinuous climatic layers and four types of paddy soils. According to the properties of stratosphere, the types of paddy soils and rice cropping systems, ten ecotopes are classified. The photo-utilization efficiency,output/input tatio of subsidiary energy and natural fertility of paddy soils are also investigated and discribed in detail. At the same time, ways for further increasing the productivity of the ecosystem are discussed.