EFFECT OF HARVEST RATE, WASTE LOADING, AND STOCKING DENSITY ON THE YIELD OF DUCKWEEDS
EFFECT OF HARVEST RATE, WASTE LOADING, AND STOCKING DENSITY ON THE YIELD OF DUCKWEEDS
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收获率、废弃物装载量和放养密度对浮萍产量的影响
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Steve A. Boney
中科院分区：
文献类型：
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作者：
M. Zaki M. Said;D. D. Culley;L. Standifer;Ernest A. Epps;Robert W. Myers;Steve A. Boney
在室外罐培养系统与10至20克/升新鲜奶牛粪便稀释液（约60至120毫克/升TKN），最大的生长浮萍（螺旋藻polyrhiza）时，收获在6天的间隔。初始放养量为70克新鲜浮萍/0.14平方米（505克/平方米）时，产量最高时，过量的新鲜生物量（34.4克），每天收获或33%的常备库存。每天收获的干浮萍的外推产量为14.9 g/m2/天，比每周收获一次高58%。除去多余的增长每天得到更高的产量比删除一半的常设作物在倍增期超过2天。浮萍氮、磷、钾含量随水体养分的增加而增加。最大干重值为：氮，6.96%;磷，1.50%;和钾，3.50%。在10克鲜粪肥/升溶液上培养的浮萍干粗蛋白含量最高为43.5%，平均为38.2%。较高的蛋白质值与较低的现存量。罐文化系统和泻湖研究使用混合物种文化之间的比较进行了讨论。泻湖数据的外推表明，每年的干重平均产量为1.76公斤/平方米，最高产量为2.2公斤/平方米时，每周收获一半的植物。每年，与4.4kg/m2的S.根据水槽系统中的每日收获量估计多根，并对季节效应进行校正。两种系统下浮萍的养分含量基本相同。在这两个系统中，曝气并没有增加产量超过非曝气测试。
In an outdoor tank culture system with 10 to 20 g/liter fresh dairy cattle manure dilutions (ca 60 to 120 mg/liter TKN), maximum growth of duckweed (Spirodela polyrhiza) was obtained when harvested at 6-day intervals. An initial stocking of 70 g fresh duckweed/0.14 m2 (505 g/m2) gave the highest yield when the excess fresh biomass (34.4 g) was harvested daily or 33% of the standing stock. The extrapolated yield of dry duckweed harvested daily was 14.9 g/m2/day and was 58% higher than one weekly harvest. Removal of excess growth daily gave higher yields than removing half the standing crop at doubling periods exceeding 2 days. Nitrogen, phosphorus, and potassium content of duckweed increased as water nutrients increased. The maximum dry weight values were: nitrogen, 6.96%; phosphorus, 1.50%; and potassium, 3.50%. The highest dry duckweed crude protein value recorded was 43.5% and the mean was 38.2% when the plants were cultured on 10 g fresh manure/liter of solution. Higher protein values were correlated with lower standing crop. Comparisons between the tank culture system and lagoon studies using mixed species culture are discussed. Extrapolation of lagoon data showed an annual dry weight mean yield of 1.76 kg/m2 and a maximum yield of 2.2 kg/m2 when one half of the plants were harvested weekly. Annually, in comparison 4.4 kg/m2 of S. polyrhiza were estimated from daily harvests in the tank system with corrections made for seasonal effects. Nutrient content of the duckweeds were similar under the two systems. Under both systems aeration did not increase yields over non-aerated tests.