摘要
对皇草（Ｐｅｎｎｉｓｅｔｕｍ ×Ｐ．ｐｕｒｐｕｒｅｕｍ ×Ｐ ｇｌａｕｃｕｍ）、杂交狼尾草（Ｐｅｎｎｉｓｅｔｕｍ ｇｌａｕｃｕｍ ｘ×Ｐ．ｐｕｒｐｕｒｅｕｍ）、矮象草（Ｐｅｎｎｉｓｅｔｕｍ ｐｕｒｐｕｒｅｕｍ）和墨西哥玉米（Ｚｅａ ｍｎｙｓ ｓｕｂｓｐ．ｍｅｘｉｃａｎａ）等４种牧草在生长期分别进行了１，２，３，４次割草试验，探讨了不同收割次数下，牧草的含水率、生物量及产量的变化规律，得到如下结果：１）播种后５３、９６、１５３、２０８ ｄ茎平均含水率分别为９４．３％，８５．８％，８ｌ．４％，７５．２％，叶平均含水率分别为８６．５％，７９．３％，７８．７％，７２．１％，含水率随收割次数的增加而呈持续降低的趋势；２）各次收割试验中，皇草和杂交狼尾草的生物量均为最高；３）从生物量积累的速度看，４种牧草均以播种后５３—９６ ｄ和 １５３—２０８ ｄ这两个时期的速度最快；播种后 ９６—１５３ ｄ，生物量的净积累普遍受到抑制；４）割草次数对总生物量（干物量）影响较大，４种牧草总生物量（干物量）的平均值从割草１次到车次分别为４９７４６、３３０２６、２８８５９和２４０７１ ｋｇ ｈｍ－２，逐渐减少；但对总产量的影响不大，相应地，４种牧草产量?
An experiment of harvesting times on biomass accumulation during growing seasons was conducted for forage grasses, Pennisetum purpureum × P. glaucum, Pennisetum glaucum × P. purpureum, Pennisetum purpureum and Zea mays subsp. mexicana. Water content in the grass, biomass and forage yield were tested. The results showed:1) At 53, 96, 153 and 208 days after sowing, average water content percentages in stems of the four forage grasses were 94.3%, 85.8%, 81 .4% and 75.2%, respectively, and those in leaves were ...
出处
《热带亚热带植物学报》
CAS
CSCD
2000年第S1期35-42,共8页
Journal of Tropical and Subtropical Botany
关键词
牧草
割草试验
生物量
产量
Forage grass
Harvesting experiment
Biomass
Yield
