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试论土地分类 被引量:14
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作者 王人潮 《浙江大学学报(农业与生命科学版)》 CAS CSCD 北大核心 2002年第4期355-361,共7页
针对土地分类存在的混乱问题 ,在综评国内外土地分类和吸取其精华的基础上 ,根据土地具有自然地理属性和社会经济属性这一特殊的双重性 ,结合笔者的科研成果与工作经验 ,建议从土地自然分类、土地资源分类和土地利用分类三个系统组成土... 针对土地分类存在的混乱问题 ,在综评国内外土地分类和吸取其精华的基础上 ,根据土地具有自然地理属性和社会经济属性这一特殊的双重性 ,结合笔者的科研成果与工作经验 ,建议从土地自然分类、土地资源分类和土地利用分类三个系统组成土地分类体系的思路出发 ,并以浙江省为例 ,提出由此组成的土地分类体系试行方案。通过组编《浙江土地资源》科技专著的试用 ,初步证明可能是解决土地科学分类的有效途径。 展开更多
关键词 土地分类 土地自然分类 土地资源分类 土地利用分类 分类体系
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论土地政策的分类 被引量:5
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作者 姜爱林 《地质技术经济管理》 2001年第4期22-27,共6页
本文在简要分析了土地的一般及法定的分类之后 ,对土地政策分类的几种主要观点进行了剖析 ,并对土地政策如何分类的有关问题作了比较深入地探讨。
关键词 土地政策 土地管理 土地自然分类 土地利用 土地评价
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Evapotranspiration and humidity variations in response to land cover conversions in the Three Gorges Reservoir Region 被引量:3
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作者 DENG Hua SHAO Jing-an 《Journal of Mountain Science》 SCIE CSCD 2018年第3期590-605,共16页
A new land cover classification system was established for the Three Gorges Reservoir Region(TGRR) after considering the continuity of inundation and the natural characteristics of land cover. The potential evapotrans... A new land cover classification system was established for the Three Gorges Reservoir Region(TGRR) after considering the continuity of inundation and the natural characteristics of land cover. The potential evapotranspiration(PET) was predicted using a modified Penman-Monteith(P-M) model. The region's ratio of precipitation to evapotranspiration was calculated as the humidity index(HI). The data obtained was used to analyze climatic responses to land cover conversions from the perspectives of evapotranspiration and humidity variations. The results show that, from 1997 to 2009, the average annual PET increased in the early years and decreased later. In terms of overall spatial distribution, a significant reciprocal relationship appeared between annual PET and annual HI. In 1997,the annual PET was higher in the lower reaches than in the upper reaches of the TGRR, but the areas with high PET shifted substantially westward by 2003. The annual PET continued to increase in 2006, but the areas with high PET shrank by 2009. In contrast, the annual HI showed varying degrees of localized spatial variability. Over the three periods, the dominantforms of land cover conversions occurred from evergreen cover to seasonal green cover, from seasonal green cover to evergreen cover, and from seasonal green cover to seasonally inundated areas, respectively. These accounted for 48.0%, 38.4%, and 23.8% of the total areas of converted land covers in the three periods, respectively. During the period between 1997 and 2003, the main forms of land cover conversions resulted in both positive and negative growths in the average annual PET, while all of them pushed down the average annual HI. From 2003 to 2006, the reservoir region experienced neither a decrease in the annual PET nor an increase in the annual HI. The period between 2006 and 2009 saw a consistent downward trend in the annual PET and a consistent upward trend in the annual HI. 展开更多
关键词 Land cover EVAPOTRANSPIRATION Humidity variations RESPONSE Three Gorges Reservoir Region
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