干旱区生态环境知识资源中心(Arid): 陕西渭北旱塬区耕地时空格局变化分析

Arid

	陕西渭北旱塬区耕地时空格局变化分析
其他题名	Spatiotemporal pattern change of cultivated land in Weibei Dryland of Shaanxi Province
	夏利恒; 刘京; 尉芳; 徐仲伟; 龙小翠; 张钰
来源期刊	农业工程学报
ISSN	1002-6819
出版年	2021
卷号	37 期号:5 页码:1002-6819
中文摘要	渭北旱塬区人地矛盾突出,准确认识该区耕地时空格局演变规律,有利于为耕地资源合理利用,粮食及生态安全保障提供决策依据。该研究基于1995-2020年耕地空间分布信息,采用重心模型、标准差椭圆、空间自相关和地学信息图谱等方法,从耕地总量变化特征、耕地空间变化特征和耕地LISA频率图谱特征3个方面开展,揭示陕西渭北旱塬区耕地空间分布特征与变化趋势。结果表明:1)与1995年相比,2020年渭北旱塬区耕地面积减少5.58%,耕地净流失区域不断扩大。25 a间,研究区耕地变化动态度始终维持在中等水平,全区耕地资源稳定性减弱,位于北部高原区的耕地资源稳定性较差。2)耕地重心总体在东北方向发生偏移。耕地标准差椭圆空间分布格局同研究区分布方向一致,向东北方向偏移,椭圆面积增加1 904.93 km~2,标准差椭圆面积主要经历增加-减少的变化过程,耕地空间分布趋于分散,且分散速率减小。3)1995-2020年研究区耕地面积比例局部空间自相关异质性较为显著,大多区域面积比值呈现高值或低值聚集状态。LISA频率图谱中,稳定不变与低频区域占比高达89.58%,耕地空间格局呈相对稳定状态。中高频区转变方式主要以低-低聚集、低-高聚集转变为不显著,研究区耕地衰减较为明显。
英文摘要	Cultivated land is an irreplaceable natural resource for food security and social stability, even human survival. However, a drastic change in the spatial distribution of occupied cultivated land has caused tremendous pressure on agricultural production and the ecological environment. It is necessary to carry out long-term dynamic monitoring for the spatial distribution of cultivated land on a regional scale in the sustainable development of the natural resource. Taking the Weibei Dryland in Shaanxi Province of China as research area, this study aims to investigate the spatial distribution and change trends of farmland since 1995. Digital elevation model (DEM) data was selected at the township-level administrative divisions in six years (1995, 2000, 2005, 2010, 2015, and 2020). ArcGIS 10.6 platform was used for the net change rate of arable land and the dynamics degree, as well as the shift of gravity center and standard deviational ellipses of cultivated land. GeoDa 1.14 software was selected for the plot of local spatial autocorrelation and laser interferometer space antenna (LISA) in the areal proportion. The results showed that: 1) The total area of cultivated land in the Weibei arid highland decreased by 5.58% in 2020, compared with 1995. Specifically, the area of cultivated land decreased by 730.47 km~2, while the net loss area of cultivated land continued to expand over the past 25 years. The dynamic degree of cultivated land change maintained at a medium level, where the stability of cultivated land resources weakened in the whole region, particularly relatively low in the northern high plain. 2) The gravity center of cultivated land shifted generally in the northeast direction. Specifically, the moving distance was 17 160.84 m, while the migration rate increased from 165.34 m/a to 1 303.78 m/a. There was a slow (1995-2000) and accelerating (2000-2020) variation in the migration speed for the gravity center of cultivated land. The spatial pattern of the standard deviational ellipse shifted also to the northeast in the cultivated land, where the ellipse area increased by 1 904.93 km~2. Nevertheless, there was a decreasing trend of cultivated land area only from 2015 to 2020, while the spatial distribution of cultivated land tended to be scattered. The scattering rate of cultivated land was stable, due mainly to the implementation of the ditch reclamation project in Yan'an City. 3) There was a significant difference in the local spatial autocorrelation heterogeneity of area ratio in the cultivated land from 1995 to 2020, ranging from 0.273 to 0.529. Most regions showed an aggregation state of high-high value (HH) or low-low value (LL). The high-high-type areas were concentrated in the southeast of the study area. In the LISA frequency geo-spectrum, the proportion of stable and low-frequency regions were 89.58% in total, indicating a relatively stable pattern of cultivated land. The transition mode was mainly from low-low and low-high aggregation to stable in the regions with the medium and high frequency. The spatial pattern attenuated more obviously in some cultivated land. Therefore, a combination of the LISA frequency map, the barycenter model, standard deviation ellipse, and spatial autocorrelation can be expected to systematically explore the variation trend of regional spatial patterns in real time. The finding can provide a scientific basis for the optimization of spatial layout in farmland protection.
中文关键词	土地利用 ; 耕地 ; 重心 ; 时空格局 ; 渭北旱塬区
英文关键词	land use cultivated land center of gravity spatio-temporal pattern Weibei Dryland
类型	Article
语种	中文
国家	中国
收录类别	CSCD
WOS类目	Agriculture
CSCD记录号	CSCD:6977510
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/365177
作者单位	夏利恒, 西北农林科技大学资源环境学院;;农业部西北植物营养与农业环境重点实验室, ;;农业部西北植物营养与农业环境重点实验室, 杨凌;;杨凌, ;; 712100;;712100.; 刘京, 西北农林科技大学资源环境学院;;农业部西北植物营养与农业环境重点实验室, ;;农业部西北植物营养与农业环境重点实验室, 杨凌;;杨凌, ;; 712100;;712100.; 尉芳, 西北农林科技大学资源环境学院;;农业部西北植物营养与农业环境重点实验室, ;;农业部西北植物营养与农业环境重点实验室, 杨凌;;杨凌, ;; 712100;;712100.; 徐仲伟, 西北农林科技大学资源环境学院;;农业部西北植物营养与农业环境重点实验室, ;;农业部西北植物营养与农业环境重点实验室, 杨凌;;杨凌, ;; 712100;;712100.; 龙小翠, 西北农林科技大学资源环境学院;;农业部西北植物营养与农业环境重点实验室, ;;农业部西北植物营养与农业环境重点实验室, 杨凌;;杨凌, ;; 712100;;712100.; 张钰, 西北农林科技大学资源环境学院;;农业部西北植物营养与农业环境重点实验室, ;;农业部西北植物营养与农业环境重点实验室, 杨凌;;杨凌, ;; 712100;;712100.
推荐引用方式 GB/T 7714	夏利恒,刘京,尉芳,等. 陕西渭北旱塬区耕地时空格局变化分析[J],2021,37(5):1002-6819.
APA	夏利恒,刘京,尉芳,徐仲伟,龙小翠,&张钰.(2021).陕西渭北旱塬区耕地时空格局变化分析.农业工程学报,37(5),1002-6819.
MLA	夏利恒,et al."陕西渭北旱塬区耕地时空格局变化分析".农业工程学报 37.5(2021):1002-6819.