Title: Study on the dynamic changes of net primary productivity of cultivated land in pasturing-farming region——A case over Yuyang district
Abstract:Based on the grain yield of Yuyang district from 1984 to 2003,the author chosen a suitable model to estimate net primary productivity of cultivated land of different region to research the relation be...Based on the grain yield of Yuyang district from 1984 to 2003,the author chosen a suitable model to estimate net primary productivity of cultivated land of different region to research the relation between ecological environment and NPP of cultivated land.The results shown as follows:(1) The total amount of NPP of cultivated land in Yuyang district generally increased 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 rate 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 increased fast during 1984~2001.At the same time, the unit area amount of NPP of 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 fellowed it.The total amount of NPP of cultivated land in urban,suburb and outer suburb of Yuyang district all increased generally,and that in outer suburb fluctuated largestly.(4)The increase of the NPP of cultivated land was partly because of increasing investition in agriculture,but mainly because of ecological environment improvement of Yuyang district.Read More
Publication Year: 2007
Publication Date: 2007-01-01
Language: en
Type: article
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