| 近年来的黄土高原耕地时空变化与口粮安全耕地数量分析 |
| |
| 引用本文： | 王凤娇,梁伟,傅伯杰,金朝,闫娜娜. 近年来的黄土高原耕地时空变化与口粮安全耕地数量分析[J]. 干旱区地理, 2020, 43(1): 161-171. DOI: 10.12118/j.issn.1000-6060.2020.01.19 |
| |
| 作者姓名： | 王凤娇 梁伟 傅伯杰 金朝 闫娜娜 |
| |
| 作者单位： | 1 陕西师范大学地理科学与旅游学院，陕西西安710119；2 中国科学院生态环境研究中心城市与区域生态国家 重点实验室，北京100085；3 西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室，陕西杨凌712100； 4 中国科学院遥感与数字地球研究所遥感科学国家重点实验室，北京100094 |
| |
| 基金项目： | 国家自然科学基金面上项目（41771118）；国家重点研发计划项目（2016YFC0501601）；中央高校基金重点项目（GK201802004,GK201804003） |
| |
| 摘 要： | 基于遥感调查数据集定量分析了1990—2015年中国黄土高原地区耕地的时空变化特征和口粮绝对安全最小耕地保障面积的数量变化。结果表明:黄土高原耕地面积从1990年的192 529.65 km2至2015年的182 688.50 km2,净减少了9 841.14 km2,幅度达5.11%,其中2000—2010年的减幅最大,净减少8 483.00 km2;较大的耕地动态变化图斑主要分布于中部和西部区域,细碎的变化图斑广泛分布;耕地地类转出面积(31 875.82 km2)大于转入面积(21 815.25 km2),耕地面积的增加主要由草地和林地转化而来,主要分布在灌溉农业区和东南部平原区,减少的耕地主要转化为草地和林地,主要分布在中部沟壑区的雨养农业区。此外,该时期耕地转化为建筑用地和交通用地等人工表面的面积逐渐增加,主要分布在东南部低海拔平原地区;黄土高原口粮绝对安全所需最小耕地保障面积呈明显减少特征(从1990年的70 913.37 km2
|
| 关 键 词： | 耕地 口粮耕地保障面积 变化特征 黄土高原 |
| 收稿时间： | 2019-05-14 |
Spatial and temporal changes of cultivated land and quantitative analysis of ration safe cultivated land on the Loess Plateau in recent years |
| |
| WANG Feng-jiao,LIANG Wei,FU Bo-jie,JIN Zhao,YAN Na-na. Spatial and temporal changes of cultivated land and quantitative analysis of ration safe cultivated land on the Loess Plateau in recent years[J]. Arid Land Geography, 2020, 43(1): 161-171. DOI: 10.12118/j.issn.1000-6060.2020.01.19 |
| |
| Authors: | WANG Feng-jiao LIANG Wei FU Bo-jie JIN Zhao YAN Na-na |
| |
| Abstract: | Based on land cover mapsand the survey data, this paperquantitatively analyzed the spatial and temporal characteristics of cultivatedland on the Loess Plateau, northwest China from1990 to 2015,and evaluated the changes in the minimum cultivated land area forgrain safety. The results showedthat the area of cultivated land decreased from 192 529.65 km2 in1990 to 182 688.50 km2 in 2015 (decreased by 5.11%),of which theperiod 2000—2010 witnessed thelargest change rate, with a net decreaseof 8 483.00 km2.The largest decrease in cultivated land was mainlydistributed in central and western area of the Loess Plateau, and the finely-changed pixels were widely scattered. The areas converted from croplands (31 875.82 km2)was larger than that converted to cultivated lands (21 815.25 km2)in the period 1990—2015.The increasedcultivated lands were mainly converted from grasslands and woodlands, which primarily occurred in the irrigated agriculturalareas and southeastern plains of the Loess Plateau; while the decreased cultivated lands were mostlyconverted to grasslands and woodlands, and it was concentrated on the middle rain-fed farm areas of the Loess Plateau. In addition, the area of cultivated land converted to build landgradually increased during this period, and mainly distributed in the low-altitude plains in the southeast of the Loess Plateau. The minimum cultivated land area for grain safetydecreased from 70 913.37 km2 in 1990 to 33 981.64 km2 in2015, and the corresponding percentage (accounted for totalcultivated land) decreased from 36.83% to 18.60%.However, the decrease of cultivated land has negligible impacton grain safety on the Loess Plateau. |
| |
| Keywords: | cultivated land minimum area of cultivated land demanded variation characteristics Loess Plateau |
|
| 点击此处可从《干旱区地理》浏览原始摘要信息 |
|
点击此处可从《干旱区地理》下载免费的PDF全文 |
|
