摘要
对榆阳区1984～2003年各乡镇耕地NPP单位面积量及总量进行分区动态测算。研究表明:①1984～2003年,榆阳区耕地净第一性生产力总量在波动中上升;②1984～2001年,榆阳区北部耕地净第一性生产力远高于南部,且呈较快上升趋势,南部黄土丘陵沟壑区耕地净第一性生产力呈较平缓的波动变化,且略有下降;③1984～2001年,榆阳区城区、近郊、远郊的差异性在单位耕地面积净第一性生产力上体现为城区>近郊>远郊;在耕地NPP总量方面,城区、近郊和远郊都表现为在波动中上升,三区变化以远郊波动幅度最大;④榆阳区耕地净第一性生产力总量的大幅增长有农业投入增加的原因,但主要得益于该区生态环境的改善。
Based on the grain yield of Yuyang area from 1984 to 2003, the authors have chosen a suitable model to estimate net primary productivity of cultivated land of different regions to research the relation between ecological environment and NPP of cultivated land. Study has shown ： （ 1 ） The total amount of NPP of cultivated land was on the rise generally in Yuyang area during 1984 - 2003. Its total amount has grown from 21.94 × 10^4 t/a in 1984 to 57. 98 × 10^4 t/a in 2003. The annual increasing degree was 5.24%. （2） The unit area amount of NPP of cultivated land in the north was not only much more than that in the south but also increasing fast during 1984 -2001. At the same time, the unit area amount of NPP of the cultivated land changed little in the south. （3） During 1984 - 2001, the unit area amount of NPP of cultivated land in urban was the highest and that in suburb was the second higher. The total amount of NPP of cultivated land in urban, suburb and outer suburb of Yuyang area was all on the rise generally, and that in outer suburb fluctuated at the largest range. （4）The increasing of the NPP of cultivated land was partly because of increasing investing in agriculture, but mainly because of ecological environment improvement of Yuyang area.
出处
《地理科学》
CSCD
北大核心
2007年第4期537-541,共5页
Scientia Geographica Sinica
基金
国家自然科学基金项目(项目编号:403710030)资助
