The fifth part: Studies on the dynamic changes of water conservation function value of vegetation ecosystem in YUYANG District during 1988-2003. The sixth part: Studies on the dynamic changes of soil retention function value of ecosystem in YUYANG District.
第五部分:榆阳区植被生态系统涵养水分功能价值动态变化研究。
参考来源 - 基于3S的风沙过渡区生态系统服务功能价值时空动态变化研究·2,447,543篇论文数据，部分数据来源于NoteExpress
第四部分：榆阳区土地利用动态变化分析。
Part four: Study on land use dynamic change in Yuyang suburb.
榆阳区为传统的农业大区，小杂琅种植分布极为广泛，品种齐全。
Yuyang District is a traditional agricultural region with wide distribution and complete range of coarse cereals.
赵庄村位于榆林市榆阳区郊区，交通便利，具有独特的区位优势。
Zhaozhuang Village is Iocated in suburb of Yuyang District of Yulin City. It is featured by unique regional advantages.
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