| 莫宏伟,刘礼英,任志远,阳岳龙,韩用顺.农牧交错区耕地净第一性生产力动态变化研究——以陕西榆林市榆阳区为例[J].干旱地区农业研究,2007,(1):15~20 |
| 农牧交错区耕地净第一性生产力动态变化研究——以陕西榆林市榆阳区为例 |
| Study on the dynamic changes of net primary productivity of cultivated land in pasturing-farming region —— A case over Yuyang district |
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| DOI：10.7606/j.issn.1000-7601.2007.01.04 |
| 中文关键词: 农牧交错区 榆阳区 耕地 净第一性生产力 动态变化 |
| 英文关键词:pasturing-far ming region Yuyang district cultivated land NPP dynamic research |
| 基金项目:国家自然科学基金资助项目（40371003) |
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| 中文摘要: |
| 以榆林市榆阳区1984～2003年各乡镇的粮食产量统计数据为依据 选用了适合农用地的净第一性生产力估算模型 对该区耕地净第一性生产力单位面积量及总量进行分区动态测算 以揭示生态环境对耕地净第一性生产力的影响。研究表明：（1） 1984～2003年间 榆阳区耕地净第一性生产力总量在波动中上升 20a 内总物质量从21．94×104t／a 增加到57．98×104 t／a年度递增率为5．24％。（2） 在1984～2001年间 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 而南部黄土丘陵沟壑区的耕地净第一性生产力呈较平缓的波动变化且略有下降。（3） 在1984～2001年间 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 但主要得益于该区的生态环境的改善。 |
| 英文摘要: |
| Based on the grain yield of Yuyang district from1984 to 2003 the author chosen a suitable model to esti mate net pri mary productivity of cultivatedland of different region to research the relation bet ween ecological environment and NPP of cultivatedland ．The results shown as follows ：（1） The total amount of NPP of cultivatedland in Yuyang district generally increased during 1984～2003．Its total amount has grown from 21．94×104t／a in 1984 to 57．98×104t／a in 2003．The annual increasing rate was 5．24％．（2） The unit area amount of NPP of cultivatedlandin the north was not only much more than that in the south but also increased fast during 1984～2001．At the same ti me the unit area amount of NPP of cultivatedland changedlittle 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 suburbfluctuatedlargestly ．（4）Theincrease of the NPP of cultivatedland was partly because of increasinginvestition in agriculture but mainly because of ecological environment i mprovement of Yuyang district． |
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