浙江省作物多熟种植制度遥感反演及其时空格局

Remote sensing retrieving of multiple cropping systems and their spatiotemporal patterns in Zhejiang Province

结合作物物候特征,利用2001—2010年的MODIS/NDVI时间序列数据,在基于改进的Savitzky-Golay滤波算法重构高质量序列的基础上,对浙江省作物熟制进行遥感反演,并分析了浙江省作物熟制的时空格局变化特征。结果表明:空间分辨率为250m的16d合成MODIS/NDVI时间序列数据能够准确定量地反演出作物熟制的时空格局;NDVI峰值集中出现于每年的2—3月、5—6月和8—9月;浙江省作物种植以一年二熟制为主,从2001—2010年的种植情况来看,一年二熟作物种植面积最大,年际变化幅度较小,一年一熟和一年三熟作物种植面积相当,年际变幅相对较大;2001年以来浙江耕地复种指数整体呈缓慢增加趋势,2010年复种最大为205.5,但距其潜力理论值288仍有一定距离,表明浙江复种潜力仍较大,耕地利用程度有待提高。

This paper analyzed the cropping intensities and spatiotemporal variations of multiple cropping systems in Zhejiang Province,based on the 2001-2010 Moderate Resolution Imaging Spectroradiometer（MODIS） NDVI datasets（16-day composite MOD13Q1）.To derive the cropping intensities,an improved Savitzky-Golay filter was applied to reconstruct the NDVI time-series.The cropping intensities retrieved from MODIS data well agreed with the agro-meteorological observations and statistic data at regional or county level.Corresponding to the phenological phenomena,the NDVI values in the Province generally peaked in February-March,May-June,and August-September.Double cropping system was the most important agricultural system.According to the recent 10 years＇ cultivation,the planting area of double cropping system was the largest,and the inter-annual variation was the least.The planting area of single cropping system was roughly at the same level as that of the triple cropping system,and both of them showed larger inter-annual variation.A slow increase of the multiple-cropping index was observed since 2001,with the maximum（205.5） appeared in 2010.However,there was still a large gap to the potential multiple-cropping index（288）,suggesting that there would be a higher potential to improve the utilization of cultivated lands in the Province.