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近30年陕北榆阳区植被土壤保持效益动态

莫宏伟1,2;任志远1   

  1. 1陕西师范大学旅游与环境学院, 西安 710062;2湖南科技大学, 湖南湘潭 411201
  • 收稿日期:2008-07-31 修回日期:1900-01-01 出版日期:2009-04-10 发布日期:2009-04-10

Dynamic changes of vegetation’s soil conservation value in Yuyang District of Northern Shaanxi in recent 30 years.

MO Hong-wei1,2; REN Zhi-yuan1   

  1. 1College of Tourism and Environment Science, Shaanxi Normal University, Xi’an 710062, China;2Hunan University of Science and Technology, Xiangtan 411201, Hunan, China
  • Received:2008-07-31 Revised:1900-01-01 Online:2009-04-10 Published:2009-04-10

摘要: 以榆阳区气候、地形、土壤及遥感影像资料为依据,运用通用水土流失方程和GIS技术对该区1978—2005年植被的土壤保持价值的时空动态变化情况进行了测算和分析。结果表明:1978—2005年,榆阳区植被的土壤保持年均总价值增加了280.37×106元,整个期间增幅约为67.6%,其中,1978—1989年和1989—2005年的增幅分别为36.5%和22.8%;位于研究区西北部的风沙草滩区的植被土壤保持价值总量增幅约为东南部黄土丘陵沟壑区的1.7倍,而黄土丘陵沟壑区的植被平均单位面积土壤保持价值则约为风沙草滩区的46倍;榆阳城区、近郊、远郊的植被平均单位面积土壤保持价值表现为:城区<近郊<远郊,植被土壤保持总价值增幅则体现为:远郊<城区<近郊。

关键词: 水稻, 化感作用, 资源竞争, N胁迫, 生态位, 化感, 竞争分离法

Abstract: Based on the data of climate, topography, soil, and remote sensing ima ges, and by using the universal soil loss equation (USLE) and geographic informa tion system (GIS) techniques, the spatiotemporal dynamic changes of vegetation’ s soil conservation value in Yuyang District of Northern Shaanxi were analyzed. The results showed that in 1978〖KG-*2〗-〖KG-*7〗2005, the total mean annual ve getation’s soil conservation value in the District increased by 28037×106 yuan, with an inc rement about 676%, among which, 365% increment was in 1978〖KG-*2〗-〖KG-*7〗19 89 and 228% increment was in 1989〖KG-*2〗-〖KG-*7〗2005. The increment of the total vegetation’s soil conservation value in wind-blown sand region was abou t 17 times as that in loess hilly-gully region, while the mean per unit veget ation’s soil conservation value in loess hilly-gully region was about 46 times as that in sand-blown region. In Yuyang District, its outer suburb had th e highest mean per unit vegetation’s soil conservation value, followed by subur b, and urban area, but its suburb had the highest increment of total vegetation ’s soil conservation value, followed by urban area, and outer suburb.

Key words: Oryza sativa, Allelopathy, Resources competition, Nitrogen stress, Econiche, Allelopathy-competition separation based bioassay (ACS)