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复种是一种集约化程度较高的种植方式,复种指数是耕作制度研究中衡量耕地资源集约化利用程度的基础性指标。在分析1978-2011年江西省耕地面积、播种面积、耕地复种指数演变的基础上,结合探索性空间数据分析(ESDA)与GIS技术,以县域为单元,探讨江西省复种指数的空间格局和演变规律。结果显示:江西省的耕地面积、粮食播种面积、耕地复种指数均呈现出下降的态势;复种指数的空间结构1980年和2010年呈中间集中型分布,集中于181%-220%和221%-250%2个级别,1990年和2000年的复种指数集中在221%-250%和251%-300%2个级别;1980年、1990年、2000年和2010年,位于高高(HH)和低低(LL)象限的县域总数分别为65个、68个、60个和65个县,占总数的71.43%、74.73%、65.93%和71.43%,局部空间集聚显著,有强烈的空间相关性,高复种指数主要集中在赣东部地区和赣北部地区,低复种指数主要集中在赣南地区。
Multiple cropping is a kind of intensive cultivation method. Multiple cropping index is the basic index to measure intensive utilization of cultivated land in the study of farming system. Based on the analysis of the cultivated land area, sown area and the index of cropland multiplication in 1978-2011 in Jiangxi Province, the spatial pattern and evolution of the multiple cropping index in Jiangxi Province were explored based on the ESDA and GIS techniques. law. The results showed that: the area of cultivated land, the sown area of grain and the index of cropland multiplication in Jiangxi Province all showed a declining trend; the spatial structure of the multiple cropping index showed an intermediate concentration distribution between 1980 and 2010, with a concentration of 181% -220% and 221% 250% and 2 levels. The multiple crop indices in 1990 and 2000 were concentrated in two levels: 221% -250% and 251% -300%. In 1980, 1990, 2000 and 2010, The total number of counties with low (LL) quadrants was 65, 68, 60 and 65 respectively, accounting for 71.43%, 74.73%, 65.93% and 71.43% of the total, with significant spatial agglomeration and strong spatial correlation , While the high multiple cropping index mainly concentrated in the eastern part of Jiangxi and northern part of Jiangxi, while the low multiple crop index mainly concentrated in southern Jiangxi.