... Mean and standard deviation of each phase and each land type 3．2时间序列分类参数提取 1）提取复种指数（cropping index），即一年内ND阳 时间序列峰值的频数。范金龙等提出峰值频数的提取可 以认为是提取函数的极大值个数【l 31。
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Multiple Cropping Index 复种指数 ; 作物复种指数 ; 复作指数
multi-cropping index 复种指数
sequential cropping index 复种指数
raise the multiple-cropping index 提高复种指数
cropping index potential 复种指数潜力
Site validation for multiple cropping index show that the accuracy of extracted multiple cropping index is over 96%.
样区复种指数的验证表明，复种指数提取结果的精度高达96％。
参考来源 - 复种指数遥感监测方法研究Multiple cropping index is a basic indicator in agricultural statistic in China, which represents the degree of intensive arable land use effectively.
耕地复种指数是衡量耕地资源集约化程度的基础性指标,也是国家宏观评价耕地资源利用状况的重要技术指标。
参考来源 - 中国东部季风区耕地复种指数遥感监测研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Potential of Multiple Cropping Index;
复种指数潜力；
At the same time, the multiple cropping index, irrigation area, grain yield and the rate of irrigation had been improved increasingly.
耕地灌溉率、复种指数、耕地灌溉面积、粮食产量不断提高；
In land scarce area, methods to increase cropping index, increase crop yield and increase planting area of wheat and sweat potato are adopted in order to increase food energy production.
在人多地少地区，粮食、饲料的供应通过增加复种、提高单产以及增加甘薯、小麦种植面积来解决。
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