西南片区耕地等别空间分布特征

(1.云南农业大学 国土资源科学技术工程研究中心, 昆明 605201; 2.云南农业大学 资源与环境学院, 昆明 650201; 3.云南农业大学 水利学院, 昆明 605201)

土地利用; 耕地质量; 空间分布; 西南片区; 局部自相关

Characteristics of Spatial Distribution of Arable Land Grade in Southwest China
YANG Yuanzhi1,2, CHEN Yunchun3, LIAO Lijun3, ZENG Weijun3, LIU Weijia2, XIANG Donglei1,3, LI Jianhua3

(1.Engineering Research Center of Science and Technology of Land and Resources, Yunnan Agricultural University, Kunming 605201, China; 2.College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China; 3.College of Water Resources, Yunnan Agricultural University, Kunming 605201, China)

land use; quality of arable land; spatial distribution; southwest region; local autocorrelation

备注

为了满足西南区耕地质量管护和利用的需求,以西南5省(市、自治区)年度更新数据为基础,运用面积加权平均法、ArcGIS空间自相关方法和数理统计等方法,分析了西南片区耕地等别空间分布特征。结果 表明:(1)西南片区耕地自然等、利用等和经济等的平均等别分别为9.85,9.86,9.80,耕地质量整体中等偏低。(2)西南片区各省耕地等别差异明显,广西自治区3类指标平均等均在8.5等以下; 四川省利用等最高为8.25等; 重庆市3类指标平均等别为9—10等; 云南省为10—11等; 贵州省质量最差,平均等为11—12等。(3)市(区、县)际3类等别分布特征和自相关分析结果相匹配,多以连片和团状聚集,整体显示质量较高的耕地集中在江南区和华南区的各市(州),平均等趋于7—8,8—9两个区间内,与自相关空间分布LL型相匹配; 而质量较差的耕地则集中分布在横断山区和云贵高原区的各市(州),与HH型相匹配; 负相关类型LH和HL无明显集中区域。西南片区耕地质量整体呈现出由北往南耕地质量逐渐上升的分布规律,耕地质量受到区位因素和自然条件影响较大,区域内具有明显的地带性分布规律。

In order to meet the demand of arable land quality management, based on the annual updated data of 5 provinces in southwest China, we analyzed the characteristics of spatial distribution of arable land in southwest China by using the area weighted average method, ArcGIS spatial autocorrelation method and mathematical statistics. The results show that:(1)the average grades of arable land in southwest China are 9.85, 9.86 and 9.80, respectively, and the arable land quality as a whole is medium and low;(2)there are significant differences in arable lands in the southwest region; the average grade of the three indicators in Guangxi Autonomous region is below 8.5; the highest utilization rate in Sichuan Province is 8.25; the average level of the three types of indicators in Chongqing City is between 9 and 10, 10—11 for Yunnan Province; the land quality in Guizhou Province was worst with an average of 11—12;(3)the distribution characteristics of the three types of intercity were matched with the autocorrelation analysis results, which were mostly clustered together in contiguous patches and clusters; as a whole, the arable land with high quality concentrated in the cities of Jiangnan region and south China region; the average distribution tended to be within 7—8 and 8—9, matching the LL type of the autocorrelation spatial distribution; however, the arable land with poor quality mainly distributed in Hengduanshan Mountain area and the cities of the Yunnan-Guizhou Plateau area, matching with HH type; negative correlation types LH and HL had no obvious concentration region. This research can provide scientific basis for the unified planning of arable land, the protection of permanent basic farmland and the balanced management of arable land occupation and compensation.