中国四川间作地区作物高度、覆盖度和叶面积指数的时间变化

作物参数在模型模拟中具有非常重要的作用。但很多关于作物参数的研究是很久以前的，一般发表于20世纪中期或更早，并且这些结果都来自于净作作物。为了填补这个空缺，进行了该项研究。结果显示:作物的高度、覆盖度和叶面积指数随时间变化很大。玉米的最大高度是177 cm，间于已有的文献值范围内。玉米的最大覆盖度是花期的86%。玉米的最大叶面积指数是1.96，低于参考文献的2.1~10的范围，这是因为参考文献的研究集中于北美和欧洲，由于品种和耕作制度的不同而造成的。甘薯的最大和最小株高分别为22 cm和12 cm。甘薯的最大覆盖度为薯块膨大期的73%。甘薯的最大叶面积指数是1.79。当甘薯和玉米间作时，其所有的作物参数受玉米影响很大。在玉米-甘薯这个间作系统中，最危险的侵蚀期是玉米收获后至甘薯覆盖度最大期。

Temporal Variation of Plant Height, Plant Cover and Leaf Area Index in Inter-cropped Area of Sichuan, China

Plant parameters play a very important roll in modeling, But a lot of investigations about plant parameters are relatively old and were published in the mid 20th century or earlier and most of the information is gathered on non-inter-cropping crops. To fill up this gap, this study was implemented. The result shows that plant height, plant cover and leaf area index vary greatly temporally. The max-plant height of corn is 177 cm which within the range of other publications. The max-plant cover of corn is 86%, which it occurs at the flowering stage of corn. The max-leaf area index of corn is 1.96 which is out of the reference range of 2.1-10, it is because the references are focused on North America and Europe with different land cover species and the farming systems. The max-and rain-plant height of sweet potato is 22 cm and 12 cm, respectively. The max-plant cover of sweet potato is 73% which occurs at the earthnut expanding stage. The max-leaf area index of sweet potato is 1.79. When the sweet potato is inter-cropped with corn, all the plant parameters of sweet potato were influenced by corn strongly. Within this inter-cropping system, the most erosion dangerous period is from the corn being harvested to the sweet potato covering soil surface exposed by harvesting corn.